sidebar:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvas_CanvasContext-draw

title:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ CanvasContext.draw header:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ develop nav:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ api

sidebar:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvas_CanvasContext-draw

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

解释：将之前在绘图上下文中的描述（路径、变形、样式）画到/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvas/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 中。

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 方法参数/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ |参数名|属性|必填|默认值|说明| |——|——|——|—-|—-| |/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ reserve|Boolean|否|false|本次绘制是否接着上一次绘制，即/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ reserve/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 参数为/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ false，则在本次调用/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ drawCanvas/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 绘制之前/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ native/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 层应先清空画布再继续绘制；若/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ reserver/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 参数为/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ true，则保留当前画布上的内容，本次调用/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ drawCanvas/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 绘制的内容覆盖在上面。| |/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ callback|Functio|是||/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 绘制完成后回调/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ |

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 示例

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 扫码体验

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 请使用百度APP扫码

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 图片示例/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 代码示例1/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ -/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ reserve为false/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ：

在开发者工具中预览效果

:::codeTab

const/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvasContext/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ =/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ swan.createCanvasContext('myCanvas');
canvasContext.setFillStyle('blue');
canvasContext.fillRect(10,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 10,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 150,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 100);
canvasContext.draw();
canvasContext.setFillStyle('red');
canvasContext.fillRect(30,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 30,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 150,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 100);
canvasContext.draw();

:::/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 图片示例/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

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/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 代码示例2/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ -/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ reserve为true/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ：

在开发者工具中预览效果

:::codeTab

Page({
/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ onReady:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ function/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ()/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ {
/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ const/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvasContext/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ =/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ swan.createCanvasContext('myCanvas');
/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvasContext.setFillStyle('blue');
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});

:::

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