缩放(scale)我有一个疑问
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 25/100
- Issue type
- Bug
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- android, java
- Domain
- computer-graphics, mobile-dev
Research direction
Start with the two Android Canvas examples in the issue and read the documentation for Canvas.scale, especially its pivot parameters and coordinate transformations. Compare the results for pivot x=100 and x=200, then document the coordinate system and the expected movement shown by both snippets.
Written by the indexing model from the issue text.
Description
RectF rect1 = new RectF(0,-200,200,0); // 矩形区域
Paint paint1= new Paint();
paint1.setColor(Color.BLACK);
Paint paint2= new Paint();
paint2.setColor(Color.BLUE);
canvas.drawRect(rect1,paint1);
canvas.scale(0.5f,0.5f,100,0);
//画一个缩放前 矩形蓝
canvas.drawRect(rect1,paint2);
RectF rect1 = new RectF(0,-200,200,0); // 矩形区域
Paint paint1= new Paint();
paint1.setColor(Color.BLACK);
Paint paint2= new Paint();
paint2.setColor(Color.BLUE);
canvas.drawRect(rect1,paint1);
canvas.scale(0.5f,0.5f,200,0);
//画一个缩放前 矩形蓝
canvas.drawRect(rect1,paint2);
我将蓝色矩形第一次移动100，缩放中心移动100，位于黑色矩形底部中心。
然而第二次移动200，缩放中心应该在黑色矩形右边线上，目测只是移动了50。
那么移动距离究竟从哪里测量才对？
- Dominant language
- Java
- Stars
- 9.3k
- Forks
- 2.1k
- PR merge metrics
- No merged PRs in 30d
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