Guide to creating the shared section of two wheels with CanvasRenderingContext2D

Is it possible to dynamically draw the shared area of two circular shapes using JavaScript and CanvasRenderingContext2D? My ultimate goal is to be able to adjust the size of the shape, ranging from a complete circle to a mere point. The desired outcome is the red section in the provided image

I attempted to use CanvasRenderingContext2D.ellipse(...) (documentation: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/ellipse), but I am unsure of how to determine the intersection of two ellipses

Currently, I am developing a plugin for chart.js, and I am restricted to using specific methods from CanvasRenderingContext2D:

interface CanvasPath {
    arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, counterclockwise?: boolean): void;
    arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
    bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
    closePath(): void;
    ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, counterclockwise?: boolean): void;
    lineTo(x: number, y: number): void;
    moveTo(x: number, y: number): void;
    quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
    rect(x: number, y: number, w: number, h: number): void;
    roundRect(x: number, y: number, w: number, h: number, radii?: number | DOMPointInit | (number | DOMPointInit)[]): void;
}
javascripttypescriptcanvaschart.jshtml5-canvas

Answer №1

Here is the solution:

        ctx.save();
        ctx.beginPath();

        ctx.ellipse(x, y, radius1, radius1, rotation, 0, 2 * Math.PI);
        // ctx.stroke();
        ctx.clip('evenodd');

        ctx.closePath();

        ctx.beginPath();
        ctx.ellipse(x2, y2, radius2, radius2, rotation, 0, 2 * Math.PI);
        // ctx.stroke();
        // ctx.clip('evenodd');

        ctx.closePath();

        ctx.fillStyle = connectToShadowData.color;
        ctx.fill();

        ctx.restore();

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