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Creating games with QCanvas |
The Qt class QCanvas features optimized 2D graphics with game related functions, such as sprites and collision detection. This article describes how to use this in a small game.
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| You've got the whole world in your hands... |
QCanvas background
The QCanvas class fits well for 2D games development, as it is optimized for speed and has some very useful features, like sprites (animated images), collision detection (essential in most 2D games), various built in shape classes and built in animation features.
To use it, you add a QCanvas to your application, and add a QCanvasView (a QWidget) to view the canvas. Then you can add QCanvasItems to the canvas. (The QCanvasView must be subclassed in order to interact with the canvas items.) We are going to demonstrate this in a small game.
The game
The game used in the demonstration is very simple, but strangely amusing: It consists of a 2D box and a ball. The ball can be picked up and tossed using the mouse, and will bounce back and forth against the walls of the box until air resistance, friction and gravity stops it, or you pick it up again. In order to make it all a bit more interesting, we use the box as an analogue of the universe, and the ball is, yup, that's correct: the Earth. (Some people might argue that there is no air resistance in space because there is no air, and that the force of gravity being directed downwards doesn't make any sense in space. These are usually the same kind of people that, when you comment on the birds happy singing on a nice spring day, will tell you that the song actually is an aggressive marking of territory. It's technically correct, but where's the fun in that?)
Attached files:
Comment List
| Topic: | Author: | Time: |
|---|---|---|
| Very much Informative | Riphat satti | 29.08.2007 10:47 |
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I think this is very useful exapme to learn about qcanvas..
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| Bounce Canvas Demo | Dr M | 15.05.2005 05:57 |
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Bounce is a very nicely written demo.
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| Very usefull | Arun Sivakumar | 01.12.2001 17:18 |
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The article featuring the QCanvas was really usefull and simple to understand. Hope you release more article covering various other features of Qt.
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