class PArc2D {
  java.awt.geom.Arc2D arc2D;
  PArc2D(float x, float y, float w, float a, float e) {
    // x, y : center
    // w : width
    // a : direction (point at) in radians
    // e : extent angle in radians
    arc2D = new java.awt.geom.Arc2D.Float(x-w/2, y-w/2, w, w, degrees(-a-e), degrees(e*2), java.awt.geom.Arc2D.PIE);
  }
  void setXY(float x, float y) {
    arc2D.setArcByCenter((double)x, (double)y, arc2D.getWidth()/2, arc2D.getAngleStart(), arc2D.getAngleExtent(), java.awt.geom.Arc2D.PIE);
  }
  void setAngle(float a) {
    arc2D.setAngleStart(-degrees(a) - arc2D.getAngleExtent()/2);
  }
  void turn(float ra) {
    arc2D.setAngleStart(arc2D.getAngleStart() - degrees(ra));
  }
  void display() {
    float x = (float)arc2D.getX();
    float y = (float)arc2D.getY();
    float w = (float)arc2D.getWidth();
    float as = -radians((float)arc2D.getAngleStart());
    float ae = radians((float)arc2D.getAngleExtent());
    arc(x + w/2, y + w/2, w, w, as - ae, as);
  }
  boolean contains(float x, float y) {
    return arc2D.contains(x, y);
  }
}