返回到:Canvas API:CanvasRenderingContext2D
本节课,我们学习CanvasRenderingContext2D.stroke()方法。
CanvasRenderingContext2D.stroke()
是 Canvas 2D API 使用非零环绕规则,根据当前的画线样式,绘制当前或已经存在的路径的方法。
语法
void ctx.stroke();
void ctx.stroke(path);
Parameters
path
绘制的路径Path2D
。
示例
使用 stroke
方法
这是一段简单的代码片段,使用 stroke
方法绘制一条路径。
HTML
<canvas id="canvas"></canvas>
JavaScript
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.rect(10, 10, 100, 100);
ctx.stroke();
修改下面的代码并在线查看 canvas 的变化:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="robots" content="noindex, nofollow"> <style> body { padding: 0; margin: 0; } svg:not(:root) { display: block; } .playable-code { background-color: #f4f7f8; border: none; border-left: 6px solid #558abb; border-width: medium medium medium 6px; color: #4d4e53; height: 100px; width: 90%; padding: 10px 10px 0; } .playable-canvas { border: 1px solid #4d4e53; border-radius: 2px; } .playable-buttons { text-align: right; width: 90%; padding: 5px 10px 5px 26px; } </style> <title>CanvasRenderingContext2D.stroke() | Web176教程www.web176.com</title> </head> <body> <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.rect(10, 10, 100, 100); ctx.stroke();</textarea> <script> var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.rect(10, 10, 100, 100); ctx.stroke(); 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); </script> </body> </html>
返回到:Canvas API:CanvasRenderingContext2D
作者:terry,如若转载,请注明出处:https://www.web176.com/canvas_api/8044.html