CanvasRenderingContext2D.ellipse

The CanvasRenderingContext2D.ellipse() method of the Canvas 2D API adds an ellipse to the path which is centered at (x, y) position with the radii radiusX and radiusY starting at startAngle and ending at endAngle going in the given direction by anticlockwise (defaulting to clockwise).

Syntax

void ctx.ellipse(x, y, radiusX, radiusY, rotation, startAngle, endAngle, anticlockwise);

Parameters

x

The x axis of the coordinate for the ellipse's center.

y

The y axis of the coordinate for the ellipse's center.

radiusX

The ellipse's major-axis radius.

radiusY

The ellipse's minor-axis radius.

rotation

The rotation for this ellipse, expressed in radians.

startAngle

The starting point, measured from the x axis, from which it will be drawn, expressed in radians.

endAngle

The end ellipse's angle to which it will be drawn, expressed in radians.

anticlockwise Optional

An optional Boolean which, if true, draws the ellipse anticlockwise (counter-clockwise), otherwise in a clockwise direction.

Examples

Using the ellipse method

This is just a simple code snippet drawing an ellipse.

HTML

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

JavaScript

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

ctx.setLineDash([])
ctx.beginPath();
ctx.ellipse(100, 100, 50, 75, 45 * Math.PI/180, 0, 2 * Math.PI);
ctx.stroke();
ctx.setLineDash([5,5])
ctx.moveTo(0, 200);
ctx.lineTo(200,0);
ctx.stroke();

Edit the code below and see your changes update live in the canvas (check your Browser support in the compatibility table, if no ellipse is drawn):

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.setLineDash([])
ctx.beginPath();
ctx.ellipse(100, 100, 50, 75, 45 * Math.PI/180, 0, 2 * Math.PI);
ctx.stroke();
ctx.setLineDash([5,5])
ctx.moveTo(0, 200);
ctx.lineTo(200,0);
ctx.stroke();</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