package cse1030.drawing;


public class TestShear {
  public static void main(String[] args) {
    SimpleDrawing3.setPenRadius(0.01);
    
    Point2D p1 = new Point2D(-0.5, 0.5);
    Point2D p2 = new Point2D(-0.5, -0.5);
    Point2D p3 = new Point2D(0.5, -0.5);
    Point2D p4 = new Point2D(0.5, 0.5);
    
    double h = 1.0;
    double delta = -0.05;
    double[] x = new double[4];
    double[] y = new double[4];
    while (true) {
      Shear s = new Shear("Shear", h);
      
      Point2D q1 = s.apply(p1);
      Point2D q2 = s.apply(p2);
      s.transform(p3);
      s.transform(p4);
      Point2D q3 = p3;
      Point2D q4 = p4;
      
      x[0] = q1.getX();
      x[1] = q2.getX();
      x[2] = q3.getX();
      x[3] = q4.getX();
      
      y[0] = q1.getY();
      y[1] = q2.getY();
      y[2] = q3.getY();
      y[3] = q4.getY();
      
      SimpleDrawing3.clear();
      SimpleDrawing3.setPenColor(SimpleDrawing3.RED);
      SimpleDrawing3.filledPolygon(x, y);
      SimpleDrawing3.show(15);
      
      h += delta;
      if (Math.abs(h) > 1.) {
        delta = -delta;
      }
      p3 = new Point2D(0.5, -0.5);
      p4 = new Point2D(0.5, 0.5);
    }
  }
}