canvas的save()和restore()运用

最新推荐文章于 2022-05-15 17:19:12 发布

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最新推荐文章于 2022-05-15 17:19:12 发布

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分类专栏： Android 文章标签： Android Canvas save restore

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本文详细介绍了Android中Canvas的save()与restore()方法。save()用于保存当前的矩阵和裁剪状态，而restore()则用于恢复这些状态。通过这两个方法可以实现图形变换的临时效果，不会永久改变Canvas的状态。

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关键字：Android，Canvas，save()，restore()3 p) v8 n* \7 d6 r+ Z

int android.graphics.Canvas.save()4 A4 K- S+ r; p* B4 x" f+ k( ^0 d

Saves the current matrix and clip onto a private stack. Subsequent calls to translate,scale,rotate,skew,concat or clipRect,clipPath will all operate as usual, but when the balancing call to restore() is made, those calls will be forgotten, and the settings that existed before the save() will be reinstated.
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Returns:
The value to pass to restoreToCount() to balance this save()- J. A7 f% r0 o5 x

void android.graphics.Canvas.restore()

This call balances a previous call to save(), and is used to remove all modifications to the matrix/clip state since the last save call. It is an error to call restore() more times than save() was called.4 h& V, V) Z( j F

Canvas的save()和restore()只是对Canvas的Matrix和Clip相关的内容进行保存和恢复。/ h1 P6 U. }+ v! J
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在下面的示例代码中，原始的样子是这样的：. a4 [, ^: y2 q