Function drawArrow

packages/2d/src/lib/components/Curve.ts:440–454

(
    context: CanvasRenderingContext2D | Path2D,
    center: Vector2,
    tangent: Vector2,
    arrowSize: number,
  )

  }

  private drawArrow(
    context: CanvasRenderingContext2D | Path2D,
    center: Vector2,
    tangent: Vector2,
    arrowSize: number,
  ) {
    const normal = tangent.perpendicular;
    const origin = center.add(tangent.scale(-arrowSize / 2));

    moveTo(context, origin);
    lineTo(context, origin.add(tangent.add(normal).scale(arrowSize)));
    lineTo(context, origin.add(tangent.sub(normal).scale(arrowSize)));
    lineTo(context, origin);
    context.closePath();
  }
}