/**
* G demo program. Demonstrates:
*
* <ul>
* <li>Positional feature among sibling GObjects.
* <li>Simple selection interaction to choose front object
* <li>Dynamic style changes
* <li>Matrix4x4 for geometry generation
* <li>Text elements and annotation strategy
* <li>Device relative graphic object
* </ul>
*
* @author <a href="mailto:[email protected]">Jacob Dreyer</a>
*/ public class Demo2 extends JFrame implements ActionListener, GInteraction
{ private JButton frontButton_; private JButton backButton_; private JButton forwardButton_; private JButton backwardButton_;
private GScene scene_; private GObject interactionObject_; private Color color_;
/**
* Class for creating the demo canvas and hande Swing events.
*/ public Demo2()
{ super ("G Graphics Library - Demo 2");
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
interactionObject_ = null;
color_ = null;
// Create the GUI
JPanel topLevel = new JPanel();
topLevel.setLayout (new BorderLayout());
getContentPane().add (topLevel);
JPanel buttonPanel = new JPanel();
buttonPanel.add (new JLabel ("Click on object to select"));
frontButton_ = new JButton ("Front");
buttonPanel.add (frontButton_);
frontButton_.addActionListener (this);
backButton_ = new JButton ("Back");
buttonPanel.add (backButton_);
backButton_.addActionListener (this);
forwardButton_ = new JButton ("Forward");
buttonPanel.add (forwardButton_);
forwardButton_.addActionListener (this);
backwardButton_ = new JButton ("Backward");
buttonPanel.add (backwardButton_);
backwardButton_.addActionListener (this);
topLevel.add (buttonPanel, BorderLayout.NORTH);
// Create the graphic canvas
GWindow window = new GWindow();
topLevel.add (window.getCanvas(), BorderLayout.CENTER);
// Create scane with default viewport and world extent settings
scene_ = new GScene (window);
// Create som graphic objects
createGraphics (scene_);
pack();
setSize (new Dimension (500, 500));
setVisible (true);
// Install the selection interaction
window.startInteraction (this);
}
private void createGraphics (GScene scene)
{ int n = 8; for (int i = 0; i < n; i++) {
Color color = Color.getHSBColor ((float) i / n, (float) 0.5, (float) 1.0);
GObject object = new TestObject ("" + i, 2.0 * i * Math.PI / n, color);
scene.add (object);
}
}
/**
* Handle button interactions.
*
* @param event Event causing call to this method.
*/ public void actionPerformed (ActionEvent event)
{ if (interactionObject_ == null) return;
Object source = event.getSource();
GObject parent = interactionObject_.getParent();
if (source == frontButton_)
parent.reposition (interactionObject_, parent.front());
else if (source == backButton_)
parent.reposition (interactionObject_, parent.back());
else if (source == forwardButton_)
parent.reposition (interactionObject_, parent.forward());
else if (source == backwardButton_)
parent.reposition (interactionObject_, parent.backward());
/**
* Handle graphic events.
*
* @param event Event type.
* @param x,y Cursor position.
*/ public void event (GScene scene, int event, int x, int y)
{
// We care of button 1 clicks only if (event == GWindow.BUTTON1_UP) {
GObject object = scene_.find (x, y);
if (object != null) { if (interactionObject_ != null)
interactionObject_.getStyle().setBackgroundColor (color_);
interactionObject_ = object;
color_ = interactionObject_.getStyle().getBackgroundColor();
interactionObject_.getStyle().
setBackgroundColor (new Color (255, 255, 255));
object.refresh();
}
}
}
/**
* Defines the geometry and presentation for a sample
* graphic object.
*/ private class TestObject extends GObject
{ private double angle_; // radians private GSegment largeCircle_; private GSegment smallCircle_; private GSegment arm_;
largeCircle_ = new GSegment();
addSegment (largeCircle_);
smallCircle_ = new GSegment();
addSegment (smallCircle_);
arm_ = new GSegment();
addSegment (arm_);
GText text = new GText (name, GPosition.MIDDLE | GPosition.CENTER);
GStyle textStyle = new GStyle();
textStyle.setForegroundColor (new Color (100, 100, 100));
textStyle.setBackgroundColor (null);
textStyle.setFont (new Font ("Dialog", Font.BOLD, 36));
text.setStyle (textStyle);
largeCircle_.setText (text);
}
public void draw()
{
// Center of viewport int x0 = (int) Math.round (getScene().getViewport().getCenterX()); int y0 = (int) Math.round (getScene().getViewport().getCenterY());
int width = (int) Math.round (getScene().getViewport().getWidth()); int height = (int) Math.round (getScene().getViewport().getHeight());
int length = Math.min (width, height) - 20; int qlength = (int) Math.round (length / 3.0);
G-DrawWithLayer.zip( 197 k)