orbitingbodycanvas.java

Massively Multiplayer Space Trading and Combat game. This is an online strategy game, not a 3D space

/*
 * OrbitingBodyCanvas.java
 *
 * Copyright (C) 2000 Jason M. Hanley
 * Released under the GNU General Public License (GPL)
 * See license.txt for additional information.
 *
 * Created on August 6, 2000, 8:59 PM
 */
 
package fate.ui;

import java.awt.*;
import java.util.*;
import javax.swing.*;

import fate.world.*;
import fate.util.*;

/** 
 * Displays a collection of {@link OrbitingBody} objects.
 *
 * @author  [e-mail]
 * @version 0.1.0
 */
public class OrbitingBodyCanvas extends JPanel {

  int radiusInPixels;
  
  /** Set of {@link OrbitingBody} objects */
  Vector objects;
  
  /** Creates new OrbitingObjectCanvas */
  public OrbitingBodyCanvas( int radiusInPixels ) {
    super();
    this.radiusInPixels = radiusInPixels;
    
    setMinimumSize( new Dimension( radiusInPixels * 2, radiusInPixels * 2 ) );
    setPreferredSize( new Dimension( radiusInPixels * 2, radiusInPixels * 2 ) );
    
  }
  
  /** Set object data */
  public void setObjects( Vector objects ) {
    this.objects = objects;
  }
  
  /** Display the canvas */
  public void paintComponent(Graphics g) {
    super.paintComponent(g); //paint background
    
    if (objects == null) {
      Debug.trace( "Error: OrbitingBodyCanvas.paintComponet(): objects are null" );
      return;
    }

    Graphics2D g2 = (Graphics2D)g;
    g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
    g2.setRenderingHint( RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON );
    
    // Set origin to the middle of the canvas
    g2.translate( radiusInPixels, radiusInPixels );
    
    // Cycle through objects
    Iterator iterObject = objects.iterator();
    OrbitingBody object;
    
    while( iterObject.hasNext() ) {
      object = (OrbitingBody) iterObject.next();
      
      // Calculates the orbit size such that an object distance of 100
      // will place the orbit half way between the center and outside border
      int orbitSize = object.distance * radiusInPixels / 100;

      //@ this will be changed when we use bitmaps for objects
      int objectSize = radiusInPixels / 15;
      
      // Draw orbit
      g2.setColor( Color.gray );
      g2.drawOval( 0 - orbitSize/2, 0 - orbitSize/2, orbitSize, orbitSize );
      
      // Draw body
      int screenX = object.x() * radiusInPixels / 200;
      int screenY = object.y() * radiusInPixels / 200;
      g2.setColor( new Color( 0, 0, 80, 96 ) );
      g2.fillOval( screenX-objectSize/2, screenY-objectSize/2, objectSize, objectSize );
      g2.setColor( Color.black );
      g2.drawOval( screenX-objectSize/2, screenY-objectSize/2, objectSize, objectSize );
      Font font = new Font( "SansSerif", Font.PLAIN, 10 );
      g2.setFont( font );
      FontMetrics metrics = g2.getFontMetrics();
      int fontWidth = metrics.stringWidth( object.name );
      g2.setColor( Color.black );
      g2.drawString( object.name, screenX-fontWidth/2-1, screenY+objectSize+2 );
    }
  }
  
}