Style inheritance : Tree « Advanced Graphics « Java

1. Java
2. Advanced Graphics
3. Tree

Style inheritance

import java.awt.*;

import javax.swing.*;

import no.geosoft.cc.geometry.Geometry;
import no.geosoft.cc.graphics.*;



/**
 * G demo program. Demonstrates:
 *
 * <ul>
 * <li>Nested GObject hierarchy
 * <li>Style inheritance
 * <li>Simple selection interaction
 * </ul>
 * 
 * @author <a href="mailto:jacob.dreyer@geosoft.no">Jacob Dreyer</a>
 */   
public class Demo8 extends JFrame
  implements GInteraction
{
  private GScene  scene_;
  
  
  public Demo8()
  {
    super ("G Graphics Library - Demo 8");
    setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
    
    // Create the GUI
    JPanel topLevel = new JPanel();
    topLevel.setLayout (new BorderLayout());
    getContentPane().add (topLevel);        

    JPanel buttonPanel = new JPanel();
    buttonPanel.add (new JLabel ("Button 1 to select color, button 2 to unselect"));

    JPanel graphicsPanel = new JPanel();
    topLevel.add (buttonPanel,   BorderLayout.NORTH);

    // Create the graphic canvas
    GWindow window = new GWindow();
    topLevel.add (window.getCanvas(), BorderLayout.CENTER);    
    
    // Create scene with default viewport and world extent settings
    scene_ = new GScene (window, "Scene");

    double w0[] = {0.0,    1200.0, 0.0};
    double w1[] = {1200.0, 1200.0, 0.0};
    double w2[] = {0.0,       0.0, 0.0};    
    scene_.setWorldExtent (w0, w1, w2);

    GStyle style = new GStyle();
    style.setForegroundColor (new Color (0, 0, 0));
    style.setBackgroundColor (new Color (255, 255, 255));
    style.setFont (new Font ("Dialog", Font.BOLD, 14));
    scene_.setStyle (style);
    
    // Create som graphic objects
    GObject object1 = new TestObject ("1", scene_,  500.0, 100.0);

    GObject object2  = new TestObject ("2",  object1, 250.0, 250.0);
    GObject object3  = new TestObject ("3",  object1, 500.0, 250.0);
    GObject object4  = new TestObject ("4",  object1, 625.0, 250.0);

    GObject object5  = new TestObject ("5",  object2, 150.0, 400.0);
    GObject object6  = new TestObject ("6",  object2, 250.0, 400.0);        
    GObject object7  = new TestObject ("7",  object2, 350.0, 400.0);            

    GObject object8  = new TestObject ("8",  object4, 625.0, 400.0);

    GObject object9  = new TestObject ("9",  object7, 250.0, 550.0);
    GObject object10 = new TestObject ("10", object7, 350.0, 550.0);    

    GObject object11 = new TestObject ("11", object8, 475.0, 550.0);
    GObject object12 = new TestObject ("12", object8, 600.0, 550.0);
    GObject object13 = new TestObject ("13", object8, 725.0, 550.0);
    GObject object14 = new TestObject ("14", object8, 850.0, 550.0);            

    GObject object15 = new TestObject ("15", object9, 150.0, 700.0);
    GObject object16 = new TestObject ("16", object9, 250.0, 700.0);
    GObject object17 = new TestObject ("17", object9, 350.0, 700.0);

    GObject object18 = new TestObject ("18", object13, 725.0, 700.0);            

    GObject object19 = new TestObject ("19", object17, 350.0, 850.0);

    GObject object20 = new TestObject ("20", object19, 250.0, 1000.0);
    GObject object21 = new TestObject ("21", object19, 350.0, 1000.0);
    GObject object22 = new TestObject ("22", object19, 450.0, 1000.0);        

    
    pack();
    setSize (new Dimension (500, 500));
    setVisible (true);

    window.startInteraction (this);
  }


  
  public void event (GScene scene, int event, int x, int y)
  {
    if (event == GWindow.BUTTON1_UP ||
        event == GWindow.BUTTON2_UP) {
      boolean isSelected = event == GWindow.BUTTON1_UP;

      GSegment selectedSegment = scene_.findSegment (x, y);
      if (selectedSegment == null) return;
      
      GStyle style = selectedSegment.getOwner().getStyle();
      if (style == null) return;

      if (isSelected)
        style.setBackgroundColor (new Color ((float) Math.random(),
                                             (float) Math.random(),
                                             (float) Math.random()));
      else
        style.unsetBackgroundColor();
        
      scene_.refresh();
    }
  }
  
  

  private class TestObject extends GObject
  {
    private TestObject  parent_;
    private double      x_, y_;
    private GSegment    circle_;
    private GSegment    line_;

    
    TestObject (String name, GObject parent, double x, double y)
    {
      parent_ = parent instanceof TestObject ? (TestObject) parent : null;
      
      x_ = x;
      y_ = y;

      line_ = new GSegment();
      addSegment (line_);
      
      circle_ = new GSegment();
      addSegment (circle_);

      circle_.setText (new GText (name, GPosition.MIDDLE));

      setStyle (new GStyle());
      
      parent.add (this);
    }

    
    double getX()
    {
      return x_;
    }


    double getY()
    {
      return y_;
    }
    
    
    
    public void draw()
    {
      if (parent_ != null) 
        line_.setGeometry (parent_.getX(), parent_.getY(), x_, y_);
      
      circle_.setGeometryXy (Geometry.createCircle (x_, y_, 40.0));
    }
  }
  


  public static void main (String[] args)
  {
    new Demo8();
  }
}

           
       

G-StyleInheritance.zip( 218 k)

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