export declare function getBezierPoint(t: number, x1: number, y1: number, cp1x: number, cp1y: number, cp2x: number, cp2y: number, x2: number, y2: number): {
    x: number;
    y: number;
};
export declare function getBezierTangent(t: number, x1: number, y1: number, cp1x: number, cp1y: number, cp2x: number, cp2y: number, x2: number, y2: number): {
    x: number;
    y: number;
};
export declare function drawArrowhead(x: number, y: number, angle: number, ctx: CanvasRenderingContext2D): void;