HTML5中怎么用Canvas绘制圆点虚线

本篇内容主要讲解"HTML5中怎么用Canvas绘制圆点虚线"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"HTML5中怎么用Canvas绘制圆点虚线"吧!

代码如下:

var canvasPrototype = window.CanvasRenderingContext2D && CanvasRenderingContext2D.prototype;

canvasPrototype.dottedLine = function(x1, y1, x2, y2, interval) {

if (!interval) {

interval = 5;

}

var isHorizontal=true;

if (x1==x2){

isHorizontal=false;

}

var len = isHorizontal ? x2-x1 : y2-y1;

this.moveTo(x1, y1);

var progress=0;

while (len > progress) {

progress += interval;

if (progress > len) {

progress = len;

}

if (isHorizontal) {

this.moveTo(x1+progress,y1);

this.arc(x1+progress,y1,1,0,2*Math.PI,true);

this.fill();

} else {

this.moveTo(x1,y1+progress);

this.arc(x1,y1+progress,1,0,2*Math.PI,true);

this.fill();

}

}

}

到此，相信大家对"HTML5中怎么用Canvas绘制圆点虚线"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！