CanvasRenderingContext2D.fillRect()

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

Syntax

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

Parameters

x

The x axis of the coordinate for the rectangle starting point.

y

The y axis of the coordinate for the rectangle 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:

<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()