如何找到（获得）“路径”的当前（最后）坐标。在画布？ [英] How to find(get) the current(last) coordinates of the "Path" in Canvas?

问题描述

context.beginPath();
context.strokeStyle="green";
context.fillStyle="green";

context.moveTo(250,500);
context.lineTo(200,500);
context.arc(500,500,300,(Math.PI/180)*180,(Math.PI/180)*300,false);
// Here I don't know what the x and y are, in case I want to draw a line with a 
//given length and NOT a line to a particular point (x,y)

context.stroke（）;
context.closePath（）;

context.stroke(); context.closePath();

推荐答案

画布中没有属性或函数用于最后一个路径位置。我想你必须自己计算一下。幸运的是，这很简单，即使对于 arc 命令也是如此。例如：

There is no attribute or function in canvas for the last path position. I think you'll have to compute it yourself. Luckily that is simple, even for the arc command. For instance:

var x = centerX + Math.cos(endAngle) * radius;
var y = centerY + Math.sin(endAngle) * radius;

这篇关于如何找到（获得）“路径”的当前（最后）坐标。在画布？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！