CanvasRenderingContext2D.rect() - Web APIs 编辑

The CanvasRenderingContext2D.rect() method of the Canvas 2D API adds a rectangle to the current path.

Like other methods that modify the current path, this method does not directly render anything.  To draw the rectangle onto a canvas, you can use the fill() or stroke() methods.

Note: To both create and render a rectangle in one step, use the fillRect() or strokeRect() methods.

Syntax

void ctx.rect(x, y, width, height);

The rect() method creates a rectangular path whose starting point is at (x, y) and whose size is specified by width and height.

Parameters

x

The x-axis coordinate of the rectangle's starting point.

y

The y-axis coordinate of the rectangle's starting point.

width

The rectangle's width. Positive values are to the right, and negative to the left.

height

The rectangle's height. Positive values are down, and negative are up.

Examples

Drawing a rectangle

This example creates a rectangular path using the rect() method. The path is then rendered using the fill() method.

HTML

<canvas id="canvas"></canvas>

JavaScript

The rectangle's corner is located at (10, 20). It has a width of 150 and a height of 100.

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.rect(10, 20, 150, 100);
ctx.fill();

Result

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• The interface defining this method: CanvasRenderingContext2D
• CanvasRenderingContext2D.fillRect
• CanvasRenderingContext2D.strokeRect()
• CanvasRenderingContext2D.fill()
• CanvasRenderingContext2D.stroke()