Pointer position incorrect of canvas is rotated
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- Dominant language
- JavaScript
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Description
Version
- Phaser Version: 3.80, 4.0.0-rc.4
- Operating system: Windows 11
Description
If the canvas is rotated, then the pointer positions will be calculated incorrectly. In the example below, the pointer should change to the hand cursor if and only if the pointer is over the green square, but it is not the case here.
Example Test Code
<!DOCTYPE` html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My First Phaser Game</title>
<style>
html, body {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
background-color: #333;
}
#gameHolder {
position: absolute;
top: 100px;
background: red;
width: 600px;
height: 500px;
transform: rotate(90deg);
}
</style>
<script src="https://cdn.jsdelivr.net/npm/phaser@4.0.0-rc.4/dist/phaser.min.js"></script>
<script>
class Example extends Phaser.Scene {
create () {
const rect = this.add.rectangle(50, 50, 300, 300, 0x00FF00, 1).setOrigin(0);
rect.setInteractive({cursor:'pointer'});
rect.on('pointermove', () => console.log('move'));
}
}
const config = {
type: Phaser.AUTO,
parent: 'gameHolder',
width:500,
height:400,
scene: Example
};
const game = new Phaser.Game(config);
</script>
</head>
<body>
<div id="gameHolder" ></div>
</body>
</html>
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the provided HTML example using Phaser 4.0.0-rc.4, the rotated #gameHolder, setInteractive({cursor:'pointer'}), and the pointermove handler. Trace the pointer-position calculation used by the canvas input system. Done means the hand cursor and pointermove behavior occur only when the pointer is over the green square, including when the canvas is rotated.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- game-dev, web-dev
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100