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CanvasRenderingContext2D.fillRect()

CanvasRenderingContext2D.fillRect() 是Canvas 2D API 绘制填充矩形的方法。矩形的起点在 (x, y) 位置,矩形的尺寸是 width 和 height fillStyle 属性决定矩形的样式。

语法

void ctx.fillRect(x, y, width, height);

参数

x
矩形起始点的 x 轴坐标。
y
矩形起始点的 y 轴坐标。
width
矩形的宽度。
height
矩形的高度。

示例

使用 fillRect 方法

这是一段使用 fillRect 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.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);

// fill the whole canvas
// ctx.fillRect(0, 0, canvas.width, canvas.height);

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.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);</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.fillRect
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

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