CanvasRenderingContext2D.fillRect

The CanvasRenderingContext2D.fillRect() method of the Canvas 2D API draws a filled rectangle whose starting point is at the coordinates (x, y) with the specified width and height and whose style is determined by the fillStyle attribute.

Syntax

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

Parameters

x

The x component of the coordinates for the rectangle's starting point.

y

The y component of the coordinates for the rectangle's starting point.

width

The rectangle's width.

height

The rectangle's height.

Examples

Using the fillRect method

This is just a simple code snippet which uses the fillRect method.

HTML

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

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'green';
ctx.fillRect(10, 10, 100, 100);

// fill the whole canvas
// ctx.fillRect(0, 0, canvas.width, canvas.height);

Edit the code below and see your changes update live in the canvas:

Playable code

<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
<div class="playable-buttons">
  <input id="edit" type="button" value="Edit" />
  <input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code">
ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);</textarea>

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var textarea = document.getElementById("code");
var reset = document.getElementById("reset");
var edit = document.getElementById("edit");
var code = textarea.value;

function drawCanvas() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  eval(textarea.value);
}

reset.addEventListener("click", function() {
  textarea.value = code;
  drawCanvas();
});

edit.addEventListener("click", function() {
  textarea.focus();
})

textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);

Specifications

Browser compatibility

See also

• The interface defining it, CanvasRenderingContext2D
• CanvasRenderingContext2D.fillStyle
• CanvasRenderingContext2D.clearRect()
• CanvasRenderingContext2D.strokeRect()