vectorpanel.java

Java source code for the Ant Colony Optimization Problem.

package jwo.jpss.spatial.gui;  // Part of the spatial GUI package.

import jwo.jpss.spatial.*;     // For spatial classes.
import java.awt.*;             // For graphics context.
import java.awt.geom.*;        // For 2D geometry display.
import java.util.*;            // For dynamic collections.
			
//  **************************************************************
/** Panel that draws a GIS vector map.
  * @author Jo Wood.
  * @version 1.3, 21st October, 2001
  */
//  **************************************************************

public class VectorPanel extends SpatialPanel
{   
    // ---------------- Object and Class variables ---------------
    
    private VectorMap vectorMap;      // Vector map to draw.
     
    // Drawing styles.
    private static final int LINE_WIDTH = 1;
    private static final BasicStroke STROKE = new BasicStroke(LINE_WIDTH);
    private static final Color BACKGROUND_COLOUR = new Color(250,250,240);
    private static final Color BORDER_COLOUR = new Color(0,0,0);
    private static final Color FILL_COLOUR = new Color(240,240,180,100);
      
    // ---------------------- Constructor ------------------------
    
    /** Creates a panel and draws the given vector map upon it.
      * @param vectorMap Vector map to draw.
      */
    public VectorPanel(VectorMap vectorMap)
    { 
        super(vectorMap);
        setBackground(new Color(255,255,255,0)); // Transparent.
        this.vectorMap = vectorMap; 
    }
        
    // ----------------------- Methods ---------------------------

    /** Draws graphics on the panel.
      * @param g Graphics context in which to draw.
      */
    public void paintComponent(Graphics g)
    {        
    	super.paintComponent(g);		// Paint background.
        Graphics2D g2 = (Graphics2D) g; // Typecast graphics as graphics2D
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                            RenderingHints.VALUE_ANTIALIAS_ON);
        
        // Draw each of the drawable GISVectors
        Iterator i = vectorMap.getGISVectors().iterator();
        while (i.hasNext())
        {
            GISVector gisVect = (GISVector)i.next();
            GeneralPath path = gisVect.getCoords();
            path.transform(getGeoToPixel());

            if (gisVect.getType() == SpatialModel.AREA)
            {
                g2.setPaint(FILL_COLOUR);
                g2.fill(path);
            }

            g2.setPaint(BORDER_COLOUR);
            g2.setStroke(STROKE);
            g2.draw(path);

            // Restore vector object back to georeferenced coords.
            path.transform(getPixelToGeo());
        }
    }
}