Function randInCircle

src/engineMath.js:446–453

Returns a random Vector2 within a circular shape * @param {number} [radius] * @param {number} [minRadius] * @return {Vector2} * @memberof Random

(radius=1, minRadius=0)

 *  @return {Vector2}
 *  @memberof Random */
function randInCircle(radius=1, minRadius=0)
{
    // r is uniform in area ⇒ r² uniform in [minRadius², radius²]
    // (the squared inner bound is what makes minRadius the actual exclusion edge)
    if (radius <= 0) return new Vector2;
    const ratio = clamp(minRadius / radius);
    return randVec2(radius * rand(ratio*ratio, 1)**.5);
}

/** Returns a random color between the two passed in colors, combine components if linear
 *  @param {Color}   [colorA=WHITE]