Ellipse

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The complete example source and integration notes are available below.

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Full-page experience · Open playground

Stretch and rotate a curved mark with independent horizontal and vertical radii.

Try it

Click the blue ellipse to turn it gold.

What to learn

• Use radiusX, radiusY, and rotation to define ellipse geometry.
• Click the filled ellipse to swap its color without changing its bounds.

Integration boundaries

• Ellipse rotation uses radians and is local to the primitive.
• The separate radii make an ellipse distinct from a circle.

This is a Pibbl Canvas example. Its mount owns its runtime resources; call its controller’s dispose method when removing it. The preview starts automatically unless reduced motion is enabled; Stop disposes the mount. Preserve the source’s logical canvas size and aspect ratio. Native HTML is not captured by Canvas filters.

Related APIs

• Ellipse

Complete source

Host setup for this source: use a canvas with width 720 and height 420, compile with jsx: "react-jsx" and jsxImportSource: "@pibbl/core", import its default mount, and call const controller = mount(canvas) after attaching the canvas. Call controller.dispose() before removing it.

ellipse.example.tsx

import { pibbl, useSignal, Ellipse, Rectangle, type PibblController } from "@pibbl/core";

function EllipseStudy() {
  const active = useSignal(false);

  return [
    <Rectangle
      style={{ left: 0, top: 0, width: 720, height: 420, fill: "#f7f0df" }}
    />,
    <Ellipse
      style={{
        cx: 360,
        cy: 210,
        radiusX: 154,
        radiusY: 78,
        rotation: -0.22,
        fill: active.get() ? "#f7c948" : "#1f4bd8",
        stroke: "#17211d",
        strokeWidth: 6,
        cursor: "pointer",
      }}
      onClick={() => active.update((value) => !value)}
    />,
  ];
}

export default function mount(canvas: HTMLCanvasElement): PibblController {
  return pibbl(canvas, <EllipseStudy />);
}

Documentation version

Documentation built with @pibbl/core 0.0.2, revision 380919b. ALPHA — NOT FOR PRODUCTION USE.