The CanvasRenderingContext2D.fillRect()
method of the Canvas 2D API draws a rectangle that is filled according to the current fillStyle
.
This method draws directly to the canvas without modifying the current path, so any subsequent fill()
or stroke()
calls will have no effect on it.
fillRect(x, y, width, height)
The fillRect()
method draws a filled rectangle whose starting point is at (x, y)
and whose size is specified by width
and height
. The fill style is determined by the current fillStyle
attribute.
This example draws a filled green rectangle using the fillRect()
method.
HTML
<canvas id="canvas"></canvas>
JavaScript
The rectangle's top-left corner is at (20, 10). It has a width of 150 and a height of 100.
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
ctx.fillStyle = "green";
ctx.fillRect(20, 10, 150, 100);
Result
This code snippet fills the entire canvas with a rectangle. This is often useful for creating a background, on top of which other things may then be drawn. To achieve this, the dimensions of the rectangle are set to equal the <canvas>
element's width
and height
attributes.
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
ctx.fillRect(0, 0, canvas.width, canvas.height);