Does ctx.stroke() and ctx.fill() automatically close path in canvas?-CodePudding

Is it necessary to include ctx.closePath() if I am going to use ctx.fill() or ctx.stroke() when drawing paths in canvas?
Here is an example below:

ctx.beginPath()
// point 1
ctx.moveTo(x 0.5,y 0.5)
// point2
ctx.lineTo(x2 0.5, y2 0.5)
// point 3
ctx.lineTo(x3 0.5, y3 0.5)

ctx.closePath() // <--- IS THIS NECESSARY ?
ctx.stroke()

CodePudding user response：

The function does what it says, it closes the path, if you want a closed triangle in your example then the closepath() is required, if you want two lines then it's not.

So the answer to your question is: No, stroke() and fill() does not close your path.

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

let x = 10;
let y = 10;

ctx.beginPath()
// point 1
ctx.moveTo(x/2 0.5,y/2 0.5)
// point2
ctx.lineTo(x*2 0.5, y*4 0.5)
// point 3
ctx.lineTo(x*3 0.5, y*2 0.5)

ctx.closePath() // <--- IS THIS NECESSARY ?
ctx.stroke()

// New path

x = 50;
y = 20;

ctx.beginPath()
// point 1
ctx.moveTo(x 0.5,y 0.5)
// point2
ctx.lineTo(x*2 0.5, y*4 0.5)
// point 3
ctx.lineTo(x*3 0.5, y*2 0.5)

ctx.stroke()

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML canvas tag.</canvas>