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Canvas scale() 方法

❮ 画布参考

示例

绘制一个矩形,缩放至 200%,然后再次绘制矩形

您的浏览器不支持 HTML5 画布标签。

JavaScript

const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.strokeRect(5, 5, 25, 15);
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
亲自试一试 »

更多示例如下。


描述

scale() 方法缩放当前上下文。

注意

如果您缩放上下文,所有将来的绘制都将被缩放。如果您 scale(2,2),绘制将被定位在您指定的画布 0,0 位置的两倍远。

另请参阅

rotate() 方法(旋转上下文)

translate() 方法(重新映射 0,0 位置)

transform() 方法(缩放、旋转、移动、倾斜上下文)

setTransform() 方法(缩放、旋转、移动、倾斜上下文)。


语法

context.scale(scalewidth, scaleheight)

参数值

参数 描述 播放它
scalewidth 缩放宽度 (1=100%, 0.5=50%, 2=200%) 播放它 »
scaleheight 缩放高度 (1=100%, 0.5=50%, 2=200%) 播放它 »

返回值



更多示例

示例

绘制一个矩形,缩放至 200%,再次绘制矩形,缩放至 200%,再次绘制矩形,缩放至 200%,再次绘制矩形

您的浏览器不支持 HTML5 画布标签。

JavaScript

const canvas = document.getElementById("myCanvas");
const ctx = canvas.getContext("2d");

ctx.strokeRect(5, 5, 25, 15);
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
ctx.scale(2, 2);
ctx.strokeRect(5, 5, 25, 15);
亲自试一试 »

浏览器支持

<canvas> 元素是 HTML5 标准 (2014)。

scale() 在所有现代浏览器中都受支持

Chrome Edge Firefox Safari Opera IE
9-11

❮ 画布参考
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