import java.util.Collection;
import java.util.Iterator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import no.geosoft.cc.graphics.*;
/**
* G demo program. Demonstrates:
*
* <ul>
* <li>Custom selection interaction
* <li>Object detection features
* <li>Style inheritance and manipulation
* <li>Dynamic style setting
* </ul>
*
* @author <a href="mailto:[email protected]">Jacob Dreyer</a>
*/
public class Demo6 extends JFrame
implements GInteraction, ActionListener
{
private JButton typeButton_;
private GStyle selectionStyle_;
private GStyle textStyle_;
private GStyle selectedTextStyle_;
private GScene scene_;
private GObject rubberBand_;
private Collection selection_;
private int x0_, y0_;
/**
* Class for creating the demo canvas and hande Swing events.
*/
public Demo6()
{
super ("G Graphics Library - Demo 6");
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
selectionStyle_ = new GStyle();
selectionStyle_.setForegroundColor (new Color (255, 255, 150));
selectionStyle_.setLineWidth (2);
selectedTextStyle_ = new GStyle();
selectedTextStyle_.setForegroundColor (new Color (255, 255, 255));
selectedTextStyle_.setFont (new Font ("Dialog", Font.BOLD, 14));
selection_ = null;
// Create the GUI
JPanel topLevel = new JPanel();
topLevel.setLayout (new BorderLayout());
getContentPane().add (topLevel);
JPanel buttonPanel = new JPanel();
buttonPanel.add (new JLabel ("Highlight lines "));
typeButton_ = new JButton ("inside");
typeButton_.addActionListener (this);
buttonPanel.add (typeButton_);
buttonPanel.add (new JLabel (" rubberband"));
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");
// Create som graphic objects
GObject testObject = new TestObject (scene_, 40);
scene_.add (testObject);
rubberBand_ = new GObject ("Interaction");
GStyle rubberBandStyle = new GStyle();
rubberBandStyle.setBackgroundColor (new Color (1.0f, 0.0f, 0.0f, 0.2f));
rubberBand_.setStyle (rubberBandStyle);
scene_.add (rubberBand_);
pack();
setSize (new Dimension (500, 500));
setVisible (true);
window.startInteraction (this);
}
public void actionPerformed (ActionEvent event)
{
String text = typeButton_.getText();
if (text.equals ("inside")) typeButton_.setText ("intersecting");
else typeButton_.setText ("inside");
}
public void event (GScene scene, int event, int x, int y)
{
switch (event) {
case GWindow.BUTTON1_DOWN :
x0_ = x;
y0_ = y;
rubberBand_.addSegment (new GSegment());
break;
case GWindow.BUTTON1_UP :
rubberBand_.removeSegments();
// Undo visual selection of current selection
if (selection_ != null) {
for (Iterator i = selection_.iterator(); i.hasNext(); ) {
GSegment line = (GSegment) i.next();
GText text = line.getText();
text.setStyle (textStyle_);
line.setStyle (null);
}
}
scene_.refresh();
break;
case GWindow.BUTTON1_DRAG :
int[] xRubber = new int[] {x0_, x, x, x0_, x0_};
int[] yRubber = new int[] {y0_, y0_, y, y, y0_};
GSegment rubberBand = rubberBand_.getSegment();
rubberBand.setGeometry (xRubber, yRubber);
// Undo visual selection of current selection
if (selection_ != null) {
for (Iterator i = selection_.iterator(); i.hasNext(); ) {
GSegment line = (GSegment) i.next();
GText text = line.getText();
text.setStyle (textStyle_);
line.setStyle (null);
}
}
if (typeButton_.getText().equals ("inside"))
selection_ = scene_.findSegmentsInside (Math.min (x0_, x),
Math.min (y0_, y),
Math.max (x0_, x),
Math.max (y0_, y));
else
selection_ = scene_.findSegments (Math.min (x0_, x),
Math.min (y0_, y),
Math.max (x0_, x),
Math.max (y0_, y));
// Remove rubber band from selection
selection_.remove (rubberBand);
// Set visual appaerance of new selection
for (Iterator i = selection_.iterator(); i.hasNext(); ) {
GSegment line = (GSegment) i.next();
line.setStyle (selectionStyle_);
GText text = line.getText();
text.setStyle (selectedTextStyle_);
}
scene_.refresh();
break;
}
}
/**
* Defines the geometry and presentation for a sample
* graphic object.
*/
private class TestObject extends GObject
{
private GSegment[] lines_;
TestObject (GScene scene, int nLines)
{
lines_ = new GSegment[nLines];
// Add style to object itself so it is inherited by segments
GStyle lineStyle = new GStyle();
lineStyle.setForegroundColor (new Color (100, 100, 100));
setStyle (lineStyle);
// Text style is set on each text element
textStyle_ = new GStyle();
textStyle_.setForegroundColor (new Color (0, 0, 0));
textStyle_.setFont (new Font ("Dialog", Font.BOLD, 14));
for (int i = 0; i < nLines; i++) {
lines_[i] = new GSegment();
addSegment (lines_[i]);
GText text = new GText (Integer.toString (i));
text.setStyle (textStyle_);
lines_[i].setText (text);
}
}
public void draw()
{
// Viewport dimensions
int width = (int) Math.round (getScene().getViewport().getWidth());
int height = (int) Math.round (getScene().getViewport().getHeight());
for (int i = 0; i < lines_.length; i++) {
int x0 = (int) Math.round (width * Math.random());
int y0 = (int) Math.round (height * Math.random());
int x1 = (int) Math.round (width * Math.random());
int y1 = (int) Math.round (height * Math.random());
lines_[i].setGeometry (x0, y0, x1, y1);
}
}
}
public static void main (String[] args)
{
new Demo6();
}
}
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G-LinesIntersection.zip( 210 k)