SE450: Compound Shapes [40/65] Previous pageContentsNext page

file:horstmann/ch06_scene3/CompoundShape.java [source] [doc-public] [doc-private]
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package horstmann.ch06_scene3;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;

/**
   A scene shape that is composed of multiple geometric shapes.
 */
public abstract class CompoundShape extends SelectableShape
{
  public CompoundShape()
  {
    path = new GeneralPath();
  }

  protected void add(Shape s)
  {
    path.append(s, false);
  }

  public boolean contains(Point2D aPoint)
  {
    return path.contains(aPoint);
  }

  public void translate(int dx, int dy)
  {
    path.transform(
        AffineTransform.getTranslateInstance(dx, dy));
  }

  public void draw(Graphics2D g2)
  {
    g2.draw(path);
  }

  private GeneralPath path;
}

file:horstmann/ch06_scene3/HouseShape.java [source] [doc-public] [doc-private]
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package horstmann.ch06_scene3;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

/**
   A house shape.
 */
public class HouseShape extends CompoundShape
{
  /**
      Constructs a house shape.
      @param x the left of the bounding rectangle
      @param y the top of the bounding rectangle
      @param width the width of the bounding rectangle
   */
  public HouseShape(int x, int y, int width)
  {
    Rectangle2D.Double base
    = new Rectangle2D.Double(x, y + width, width, width);

    // The left bottom of the roof
    Point2D.Double r1
    = new Point2D.Double(x, y + width);
    // The top of the roof
    Point2D.Double r2
    = new Point2D.Double(x + width / 2, y);
    // The right bottom of the roof
    Point2D.Double r3
    = new Point2D.Double(x + width, y + width);

    Line2D.Double roofLeft
    = new Line2D.Double(r1, r2);
    Line2D.Double roofRight
    = new Line2D.Double(r2, r3);

    add(base);
    add(roofLeft);
    add(roofRight);
  }
}

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