MDN wants to talk to developers like you: https://qsurvey.mozilla.com/s3/8d22564490d8

CanvasRenderingContext2D.translate()

CanvasRenderingContext2D.translate() 是 Canvas 2D API 通过在网格中移动 canvas 和 canvas 原点 x 水平方向、原点 y 垂直方向,添加平移变换的方法。

语法

void ctx.translate(x, y);

参数

x
水平方向的移动距离。
y
垂直方向的移动距离。

示例

使用 translate 方法

这是一段使用 translate 方法的简单的代码片段。

HTML

<canvas id="canvas"></canvas>

JavaScript

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

ctx.translate(50, 50);
ctx.fillRect(0,0,100,100);

// reset current transformation matrix to the identity matrix
ctx.setTransform(1, 0, 0, 1, 0, 0);

修改下面的代码并在线查看 canvas 的变化:

Playable code
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
<div class="playable-buttons">
  <input id="edit" type="button" value="Edit" />
  <input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code">
ctx.translate(50, 50);
ctx.fillRect(0,0,100,100);
ctx.setTransform(1, 0, 0, 1, 0, 0);</textarea>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var textarea = document.getElementById("code");
var reset = document.getElementById("reset");
var edit = document.getElementById("edit");
var code = textarea.value;

function drawCanvas() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  eval(textarea.value);
}

reset.addEventListener("click", function() {
  textarea.value = code;
  drawCanvas();
});

edit.addEventListener("click", function() {
  textarea.focus();
})

textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);

规范描述

Specification Status Comment
WHATWG HTML Living Standard
CanvasRenderingContext2D.translate
Living Standard  

浏览器兼容性

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

参见

文档标签和贡献者

 此页面的贡献者: ice-i-snow
 最后编辑者: ice-i-snow,