CODEWITHSUNDEEP
javascripthtml5-canvas
newbie
newbie

Reputation: 146

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

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()

Upvotes: 3

Views: 722

Answers (1)

Nils K&#228;hler
Nils K&#228;hler

Reputation: 3001

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>

Upvotes: 2

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