HTML canvas rect()Method
Canvas objectExample
Draw a 150*100 pixel rectangle:
JavaScript：
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.rect(20,20,150,100);
ctx.stroke();
var ctx=c.getContext("2d");
ctx.rect(20,20,150,100);
ctx.stroke();
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Browser Support
Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the rect() method.
Note:Internet Explorer 8 and earlier versions do not support the <canvas> element.
Definition and Usage
The rect() method creates a rectangle.
Tip:Please use thestroke()orfill()method to actually draw the rectangle on the canvas.
| JavaScript Syntax: | context.rect(x,y,width,height); |
|---|
Parameter Values
| Parameter | Description |
|---|---|
| x | The x-coordinate of the upper-left corner of the rectangle. |
| y | The y-coordinate of the upper-left corner of the rectangle. |
| width | The width of the rectangle, in pixels. |
| height | The height of the rectangle, in pixels. |
More Examples
Example
Create three rectangles with the rect() method:
JavaScript：
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
// Red rectangle
ctx.beginPath();
ctx.lineWidth="6";
ctx.strokeStyle="red";
ctx.rect(5,5,290,140);
ctx.stroke();
// Green rectangle
ctx.beginPath();
ctx.lineWidth="4";
ctx.strokeStyle="green";
ctx.rect(30,30,50,50);
ctx.stroke();
// Blue rectangle
ctx.beginPath();
ctx.lineWidth="10";
ctx.strokeStyle="blue";
ctx.rect(50,50,150,80);
ctx.stroke();
var ctx=c.getContext("2d");
// Red rectangle
ctx.beginPath();
ctx.lineWidth="6";
ctx.strokeStyle="red";
ctx.rect(5,5,290,140);
ctx.stroke();
// Green rectangle
ctx.beginPath();
ctx.lineWidth="4";
ctx.strokeStyle="green";
ctx.rect(30,30,50,50);
ctx.stroke();
// Blue rectangle
ctx.beginPath();
ctx.lineWidth="10";
ctx.strokeStyle="blue";
ctx.rect(50,50,150,80);
ctx.stroke();
Try it yourself »
Other Extensions