CanvasRenderingContext2D.moveTo()
是 Canvas 2D API 将一个新的子路径的起始点移动到 (x,y) 坐标的方法。
语法
void ctx.moveTo(x, y);
参数
x
点的 x 轴。
y
点的 y 轴。
示例
使用 moveTo
方法
这是一段使用 moveTo
方法的简单的代码片段,移动画笔到起始点绘制一条线。
HTML
<canvas id="canvas"></canvas>
JavaScript
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.beginPath();
ctx.moveTo(50,50);
ctx.lineTo(200, 50);
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"> <title>CanvasRenderingContext2D.moveTo() | Web176教程www.web176.com</title> <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> </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.beginPath(); ctx.moveTo(50,50); ctx.lineTo(200, 50); ctx.stroke()</textarea> <script> var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.moveTo(50,50); ctx.lineTo(200, 50); 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>
作者:terry,如若转载,请注明出处:https://www.web176.com/canvas_api/7746.html