Skip to content

KDAB TV – Recent Videos KDAB's YouTube Channel: Qt, C++ and 3D tutorials, news and more

KDAB's YouTube Channel: Qt, C++ and 3D tutorials, news and more

KDAB as the global No.1 software consultancy for Qt, C++ and 3D applications and has been a relevant source for professional software developers for 20 years, offering a good mix of valuable information. As video content has become increasingly relevant, we have decided to offer regular, highly visible videos for professional developers using Qt, C++ and 3D technologies.

The channel offers tutorials for beginners and advanced developers presented by our experienced experts as well as show cases, C++, Qt and 3D related news, insights on events and trends. Click the tabs to explore.

KDAB TV – Latest

Sometimes the simple questions comes with a super complex answer. Question: How do you draw a rectangle around a piece of text? Answer: Uh ohh, hold my beer (or coffee or ...) .....  QFontMetrics::width() doesn't exists anymore, instead it suggest to call QFontMetrics:::horizontalAdvance. That, however, returns a too tight box.  Then there is QFontMetrics::boundingRect, but at first sight that just return something really weird. Then there is QPainter::boundingRect, but just like horizontalAdvance, that is too tight too... But in the end Jesper, untangles it all and succeeds! Chapters 0:00 Intro 0:30 What triggered this episode 01:22 QFontMetrics::width is depreciated 02:24 QFontMetrics::horizontalAdvance draws outside the box 3:22 documentation for horitontalAdvance 6:36 QFontMetrics::boundingRect 9:58 OK, lets try and translate the boundingRect to (0,0) 10:47 Let's try and translate by (leftBerring, accent) 12:50 QPainter::boundingRect 14:25 Lets just try and add some space... 17:00 QFontMetrics::tightBoundingRect 17:36 Finally, I think I understood it! 22:45 Let me know your thoughts on this. The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Qt-Widgets-and-more/font-metrics Link to Episode 41 - Module 6 - Introduction to Qt Widgets series: https://youtu.be/dhEdW4QBx70?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more.  https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Understanding QFontMetrics::bounding rect

Sometimes the simple questions comes with a super complex answer.

Question: How do you draw a rectangle around a piece of text?
Answer: Uh ohh, hold my beer (or coffee or ...) ..... 

QFontMetrics::width() doesn't exists anymore, instead it suggest to call QFontMetrics:::horizontalAdvance. That, however, returns a too tight box. 
Then there is QFontMetrics::boundingRect, but at first sight that just return something really weird.
Then there is QPainter::boundingRect, but just like horizontalAdvance, that is too tight too...
But in the end Jesper, untangles it all and succeeds!

Chapters
0:00 Intro
0:30 What triggered this episode
01:22 QFontMetrics::width is depreciated
02:24 QFontMetrics::horizontalAdvance draws outside the box
3:22 documentation for horitontalAdvance
6:36 QFontMetrics::boundingRect
9:58 OK, lets try and translate the boundingRect to (0,0)
10:47 Let's try and translate by (leftBerring, accent)
12:50 QPainter::boundingRect
14:25 Lets just try and add some space...
17:00 QFontMetrics::tightBoundingRect
17:36 Finally, I think I understood it!
22:45 Let me know your thoughts on this.

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Qt-Widgets-and-more/font-metrics

Link to Episode 41 - Module 6 - Introduction to Qt Widgets series: https://youtu.be/dhEdW4QBx70?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:

KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more.  https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

6 1

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLnY4ZFZTeGtIZ1Yw

Understanding QFontMetrics::bounding rect

Printing in Qt is easy! Learn how in this episode. Links: * KDAB Profiling Workshop: https://www.kdab.com/software-services/workshops/profiling-workshops/ * KD Reports: https://www.kdab.com/development-resources/qt-tools/kd-reports/ The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 00:00 Intro 00:47 Compile in support for printing 01:24 Printing is similar to painting on a widget 02:39 Choosing where to print to - QPrintDialog 03:36 Taking screenshots 08:06 Ad: profiling your application 08:25 What printers do you have? 10:21 Print preview - QPrintPreviewDialog 13:11 Some code showing it all 17:10 KD Reports 21:56 The end - what did we see in this module? All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 45) - Printing

Printing in Qt is easy! Learn how in this episode.

Links:
* KDAB Profiling Workshop: https://www.kdab.com/software-services/workshops/profiling-workshops/
* KD Reports: https://www.kdab.com/development-resources/qt-tools/kd-reports/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

00:00 Intro
00:47 Compile in support for printing
01:24 Printing is similar to painting on a widget
02:39 Choosing where to print to - QPrintDialog
03:36 Taking screenshots
08:06 Ad: profiling your application
08:25 What printers do you have?
10:21 Print preview - QPrintPreviewDialog
13:11 Some code showing it all
17:10 KD Reports
21:56 The end - what did we see in this module?

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

10 3

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLlpsUkswakdBNExB

Introduction to Qt Widgets (Part 45) - Printing

In this episode I'll implement a simple bar chart, which involves painting the actual bars. Links: * KDAB QML Training: https://training.kdab.com/portfolio/qtqml/ The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 0:00 Introduction 0:45 What will the solution look like? 1:25 Understanding the handout 3:05 Painting "0%" and "100%" 9:43 Drawing the top line 10:55 Drawing the vertical lines 15:00 Drawing the bars 21:10 Advertise: QML trainings 21:28 Bar outlines dotted 23:40 Selecting the bars 32:13 Do review your code a lot of times All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 44) - Lab Bar Chart

In this episode I'll implement a simple bar chart, which involves painting the actual bars.

Links:
* KDAB QML Training: https://training.kdab.com/portfolio/qtqml/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

0:00 Introduction
0:45 What will the solution look like?
1:25 Understanding the handout
3:05 Painting "0%" and "100%"
9:43 Drawing the top line
10:55 Drawing the vertical lines
15:00 Drawing the bars
21:10 Advertise: QML trainings
21:28 Bar outlines dotted
23:40 Selecting the bars
32:13 Do review your code a lot of times

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

11 0

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLlY1bHZObWdRdi1r

Introduction to Qt Widgets (Part 44) - Lab Bar Chart

With your current knowledge of QPainter, you would likely have a hard time if I asked you to draw an analog clock. Obviously, you know you can draw a line between two points with drawLine, but how do you determine these two points for say the 5 o'clock marker? To the rescue comes coordinate transformations, which is the topic of this episode. Links: * KDAB Consulting: https://www.kdab.com/software-services/software-projects/consulting/ The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 00:00 Introduction 00:44 Translate 01:21 Scale 01:35 Shear 02:04 Rotate 02:20 drawRotatedText 06:50 QTransform 08:12 Example with QTransform 9:54 QMatrix doesn't exists anymore 10:13 Perspective Projection 12:13 Analog clock 13:40 Ad: Migrating from Raspberry Pie to Banana Pie 14:02 Analog clock continued 19:50 Making the y axis point upwards 22:49 What's up next All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 43) - Coordinate Transformations

With your current knowledge of QPainter, you would likely have a hard time if I asked you to draw an analog clock. Obviously, you know you can draw a line between two points with drawLine, but how do you determine these two points for say the 5 o'clock marker?

To the rescue comes coordinate transformations, which is the topic of this episode.

Links:
* KDAB Consulting: https://www.kdab.com/software-services/software-projects/consulting/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

00:00 Introduction
00:44 Translate
01:21 Scale
01:35 Shear
02:04 Rotate
02:20 drawRotatedText
06:50 QTransform
08:12 Example with QTransform
9:54 QMatrix doesn't exists anymore
10:13 Perspective Projection
12:13 Analog clock
13:40 Ad: Migrating from Raspberry Pie to Banana Pie
14:02 Analog clock continued
19:50 Making the y axis point upwards
22:49 What's up next

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

8 0

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLlZMcG9EczE1by1Z

Introduction to Qt Widgets (Part 43) - Coordinate Transformations

Where are the pixels for the outline of a rectangle drawn? Inside the rectangle? Outside the rectangle? Or in between? The answer is: "It depends". Learn the details in this episode Links: * KDAB Modernization Services: https://www.kdab.com/software-services/software-projects/modernize/ The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 0:00 Intro 0:27 Which pixels are drawn? 3:45 Ad - Help upgrade your software 4:04 ...but how about if you do not use antialiasing? 6:10 An example showing the problem All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About ths host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 42) - What is Really Drawn?

Where are the pixels for the outline of a rectangle drawn? Inside the rectangle? Outside the rectangle? Or in between?

The answer is: "It depends". Learn the details in this episode

Links:
* KDAB Modernization Services: https://www.kdab.com/software-services/software-projects/modernize/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

0:00 Intro
0:27 Which pixels are drawn?
3:45 Ad - Help upgrade your software
4:04 ...but how about if you do not use antialiasing?
6:10 An example showing the problem

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About ths host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

10 1

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLjNIY1ZDc2ItMGJJ

Introduction to Qt Widgets (Part 42) - What is Really Drawn?

Welcome to the KDAB News Flash, the update for developers working with desktop and embedded software such as Qt, C++, Rust and Linux. In this edition, we have: 0:00 Introduction 0:19 KDAB Training Day 2025: dates, courses and why Attend? 1:20 Effective Modern QML course by Nicolas Fella - Trainer Overview 2:16 How is this course different from the other 2 QML courses? 3:58 Other courses information 05:05 Qt World Summit 2025: date and tickets ** Here you find all the links mentioned in the News Flash: KDAB Training Day 2025: https://training.kdab.com/ktd25/ Qt World Summit 2025: https://www.qt.io/qt-world-summit-2025 Registration link: https://www.qt.io/qt-world-summit-2025#tickets About KDAB: Trusted software excellence across embedded and desktop platforms The KDAB Group is a globally recognized provider for software consulting, development and training, specializing in embedded devices and complex cross-platform desktop applications. In addition to being leading experts in Qt, C++ and 3D technologies for over two decades, KDAB provides deep expertise across the stack, including Linux, Rust and modern UI frameworks. https://www.kdab.com/software-services. KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++. https://training.kdab.com/ With 100+ employees from 20 countries and offices in Sweden, Germany, USA, France and UK, we serve clients around the world. https://www.kdab.com/about/contact/
KDAB News | KDAB Training Day & Qt World Summit 2025

Welcome to the KDAB News Flash, the update for developers working with desktop and embedded software such as Qt, C++, Rust and Linux.

In this edition, we have:

0:00 Introduction
0:19 KDAB Training Day 2025: dates, courses and why Attend?
1:20 Effective Modern QML course by Nicolas Fella - Trainer Overview
2:16 How is this course different from the other 2 QML courses?
3:58 Other courses information
05:05 Qt World Summit 2025: date and tickets

**

Here you find all the links mentioned in the News Flash:

KDAB Training Day 2025: https://training.kdab.com/ktd25/
Qt World Summit 2025: https://www.qt.io/qt-world-summit-2025
Registration link: https://www.qt.io/qt-world-summit-2025#tickets


About KDAB:
Trusted software excellence across embedded and desktop platforms

The KDAB Group is a globally recognized provider for software consulting, development and training, specializing in embedded devices and complex cross-platform desktop applications. In addition to being leading experts in Qt, C++ and 3D technologies for over two decades, KDAB provides deep expertise across the stack, including Linux, Rust and modern UI frameworks. https://www.kdab.com/software-services.

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++. https://training.kdab.com/

With 100+ employees from 20 countries and offices in Sweden, Germany, USA, France and UK, we serve clients around the world. https://www.kdab.com/about/contact/

5 0

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLnRHNHQxeGtWUHVF

KDAB News | KDAB Training Day & Qt World Summit 2025

In this episode, we will look at the operations that QPainter offers, and especially, try to understand the drawText() method which is far from trivial. Links: * QWAM episode "Understanding QFontMetrics::bounding rect" for drawText: https://www.youtube.com/watch?v=v8dVSxkHgV0&list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI&index=148 * KDAB Support for Android software: https://www.kdab.com/platforms/android/ The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 0:00 Introduction 0:28 Painting Operations 8:16 drawText 10:30 The flags 11:45 drawText API for QPoint 15:30 The width of the text - QFontMetrics 18:42 Ad - Android applications for Qt 19:03 drawPainterPath All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 41) - Painting Operations

In this episode, we will look at the operations that QPainter offers, and especially, try to understand the drawText() method which is far from trivial.

Links:
* QWAM episode "Understanding QFontMetrics::bounding rect" for drawText: Coming soon
* KDAB Support for Android software: https://www.kdab.com/platforms/android/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

0:00 Introduction
0:28 Painting Operations
8:16 drawText
10:30 The flags
11:45 drawText API for QPoint
15:30 The width of the text - QFontMetrics
18:42 Ad - Android applications for Qt
19:03 drawPainterPath

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:

KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

8 0

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLmRoRWRXNFFCeDcw

Introduction to Qt Widgets (Part 41) - Painting Operations

Qt has a poor man's version of theming your application by changing the color schemes. It is most certainly used in KDE, but besides that I've never really seen it in action. It does, however, have quite some impact on how you do something as simple as changing the background color of a push button. Watch this episode to learn more. Links: * KDAB C++ Training Portfolio: https://training.kdab.com/portfolio/modern-cpp/ * QStyle video: https://www.youtube.com/watch?v=Qn4HHbDxG0M The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 00:00 Intro 00:25 Get involved in KDE! 00:52 Color themes was born 01:55 Advertise - C++ training 02:26 QPalette and color groups 04:00 Night mode using palettes 04:58 How to change the palette 06:15 The color roles 09:20 What's up next? All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 40) - Color Themes and Palettes

Qt has a poor man's version of theming your application by changing the color schemes. It is most certainly used in KDE, but besides that I've never really seen it in action.
It does, however, have quite some impact on how you do something as simple as changing the background color of a push button. Watch this episode to learn more.

Links:
* KDAB C++ Training Portfolio: https://training.kdab.com/portfolio/modern-cpp/
* QStyle video: https://www.youtube.com/watch?v=Qn4HHbDxG0M

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

00:00 Intro
00:25 Get involved in KDE!
00:52 Color themes was born
01:55 Advertise - C++ training
02:26 QPalette and color groups
04:00 Night mode using palettes
04:58 How to change the palette
06:15 The color roles
09:20 What's up next?

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

11 0

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLk5pN3IySEtjalVr

Introduction to Qt Widgets (Part 40) - Color Themes and Palettes

In this episode you will among other things learn - How to draw the outline and the filling of say an elipse - The difference between QPixmap and QImage - How to implement your own screen saver with a wobbling text with a color gradient through it - OK, almost... Links: * 'Introduction to Qt Widgets' episode on 'Resources': https://www.youtube.com/watch?v=BIES4pOVtz8&list=PL6CJYn40gN6iFcTyItvnE5nOmJR8qk_7o The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 0:00 Introduction 00:40 Color spaces 02:12 RGB colors 04:20 Transparency 06:52 QPixmap v.s. QImage 10:35 QPen 11:31 QBrush 13:05 Qt::NoPen - when would you use that? 13:48 Gradients 15:20 Pens with brushes 16:09 What's next All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 39) - Color Handling

In this episode you will among other things learn
- How to draw the outline and the filling of say an elipse
- The difference between QPixmap and QImage
- How to implement your own screen saver with a wobbling text with a color gradient through it - OK, almost...

Links:
* 'Introduction to Qt Widgets' episode on 'Resources': https://www.youtube.com/watch?v=BIES4pOVtz8&list=PL6CJYn40gN6iFcTyItvnE5nOmJR8qk_7o

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

0:00 Introduction
00:40 Color spaces
02:12 RGB colors
04:20 Transparency
06:52 QPixmap v.s. QImage
10:35 QPen
11:31 QBrush
13:05 Qt::NoPen - when would you use that?
13:48 Gradients
15:20 Pens with brushes
16:09 What's next

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

8 2

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLkZWQkFPNGRCNzVr

Introduction to Qt Widgets (Part 39) - Color Handling

In this module, we will talk about painting your own widgets, and we will see a number of techniques and classes involved in this. We will start with this episode where we discuss the very simplest way to get some pixels on the screen. Links: * Difference between update and repaint: https://youtu.be/jCNxm1drQ8w?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI * KDAB C++ Training Portfolio: https://training.kdab.com/portfolio/modern-cpp/ The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets 0:00 Intro 00:28 A travel back to 1993 - how would you implement painting? 02:10 Back in 2024 - QPainter / QPaintDevice etc. 04:16 An example of Painting 06:15 Double buffering 07:42 Widgets are transparents 08:06 Advertise  08:27 The painting application explained 11:09 Anti-aliased painting 14:19 QSize, QPoint, QLine, QRect 17:17 Whats up next All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf All 'Introduction to Qt Widgets - Module 2' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy All 'Introduction to Qt Widgets - Module 3' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd All 'Introduction to Qt Widgets - Module 4' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9- All 'Introduction to Qt Widgets - Module 5' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI All 'Introduction to Qt Widgets - Module 6' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT About the host: The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time. Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/ About KDAB: KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more.  https://www.kdab.com/software-services KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++. Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/ We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/
Introduction to Qt Widgets (Part 38) - Painting Basics

In this module, we will talk about painting your own widgets, and we will see a number of techniques and classes involved in this.
We will start with this episode where we discuss the very simplest way to get some pixels on the screen.

Links:
* Difference between update and repaint: https://youtu.be/jCNxm1drQ8w?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI
* KDAB C++ Training Portfolio: https://training.kdab.com/portfolio/modern-cpp/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widget

0:00 Intro
00:28 A travel back to 1993 - how would you implement painting?
02:10 Back in 2024 - QPainter / QPaintDevice etc.
04:16 An example of Painting
06:15 Double buffering
07:42 Widgets are transparents
08:06 Advertise 
08:27 The painting application explained
11:09 Anti-aliased painting
14:19 QSize, QPoint, QLine, QRect
17:17 Whats up next

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI

All 'Introduction to Qt Widgets - Module 6' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6jIsRYriqN70V83t_mdDZHT

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more.  https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

14 1

YouTube Video VVVqc0prVEpTWjVHN2V3SDJ1ZjA4dDBBLk1Hc1lFTU85NEN3

Introduction to Qt Widgets (Part 38) - Painting Basics

Load More...