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CanvasRenderingContext2D.lineTo()

CanvasRenderingContext2D.lineTo() 是 Canvas 2D API 使用直线连接子路径的终点到x,y坐标的方法(并不会真正地绘制)。

语法

void ctx.lineTo(x, y);

参数

x
直线终点的 x 轴坐标。
y
直线终点的 y 轴坐标。

示例

使用 lineTo 方法

这是一段使用 lineTo 方法的简单的代码片段。 使用 beginPath() 绘制路径的起始点, 使用 moveTo()移动画笔, 使用 stroke() 方法真正地画线。

HTML

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

JavaScript

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

ctx.beginPath();
ctx.moveTo(0,0);
ctx.lineTo(100, 100);
ctx.stroke();

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.beginPath();
ctx.moveTo(0,0);
ctx.lineTo(100, 100);
ctx.stroke();</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.lineTo
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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