CanvasRenderingContext2D.clip

The CanvasRenderingContext2D.clip() method of the Canvas 2D API turns the path currently being built into the current clipping path.

Syntax

void ctx.clip();
void ctx.clip(fillRule);
void ctx.clip(path, fillRule);

Parameters

fillRule

The algorithm by which to determine if a point is inside a path or outside a path.
Possible values:

• "nonzero": The non-zero winding rule, which is the default rule.
• "evenodd": The even-odd winding rule.

path

A Path2D path to clip.

Examples

Using the clip method

This is just a simple code snippet which uses the clip method to create a clipping region.

HTML

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

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

// Create clipping region
ctx.beginPath();
ctx.arc(100, 100, 75, 0, Math.PI * 2, false);
ctx.clip();

ctx.fillRect(0, 0, 100,100);

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.arc(100, 100, 75, 0, Math.PI*2, false);
ctx.clip();
ctx.fillRect(0, 0, 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.