/**
 * Generate triangle fan vertices for arcs, ellipses, and rounded rect corners.
 * @param {number} cx - center x
 * @param {number} cy - center y
 * @param {number} rx - horizontal radius
 * @param {number} ry - vertical radius
 * @param {number} startAngle - start angle in radians
 * @param {number} endAngle - end angle in radians
 * @param {number} segments - number of segments
 * @returns {Array<{x: number, y: number}>} triangle vertices
 */
export function generateTriangleFan(cx: number, cy: number, rx: number, ry: number, startAngle: number, endAngle: number, segments: number): Array<{
    x: number;
    y: number;
}>;
/**
 * Generate triangle vertices for round line join circles at the given centers.
 * @param {Array<{x: number, y: number}>} centers - join point positions
 * @param {number} radius - join circle radius (typically lineWidth / 2)
 * @returns {Array<{x: number, y: number}>} triangle vertices
 */
export function generateJoinCircles(centers: Array<{
    x: number;
    y: number;
}>, radius: number): Array<{
    x: number;
    y: number;
}>;
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