imageframe.java

地图显示实例

import java.awt.*;
import Tile;

public class ImageFrame extends Frame {
  static final int RED = 1, COMP = 2, ENTIRE_RED = 3, ENTIRE_COMP = 4;
  static final Color color1 = Color.red, color2 = Color.black;
  Image image;
  Tile tile;
  int halfSymbolSize = 8;
  int type, index;
  
  /* 
     typ is the type, 
     indx is the index of the composite tile, only if type is COMP
  */
  public ImageFrame(Tile til, int typ, int indx) {
    super(til.tileName);
    tile = til;
    type = typ;
    index = indx;

    switch (type) {
    case RED: image = tile.redImage; break;
    case ENTIRE_RED: image = Tile.redMap; break;
    case COMP: 
      image = tile.compositeImages[ index ]; 
      /* get the tileName from UpperLeftCorner / 256 */
      setTitle(til.tileName + "-" + index + ": Comp Tile " +
	       tile.compCorners[ index ].y / 256 + "." + 
	       tile.compCorners[ index ].x / 256);
      break;
    case ENTIRE_COMP: image = Tile.compMap; break;
    default: 
    }
    
    /* wait till image is loaded */
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(image, 1);
    try tracker.waitForID(1); catch (InterruptedException e);
    if (tracker.isErrorID(1)) {
	System.out.println("Error loading image ");
	this.dispose();
    }
    else {
      resize(image.getWidth(this), image.getHeight(this));
      System.out.println(image.getWidth(this) + " "+ image.getHeight(this));
      show();
    }
  }
 
  public boolean handleEvent(Event evt) {
    if (evt.id == Event.MOUSE_DOWN) 
      System.out.println("Point " + evt.x + ", " + evt.y);

    if (evt.id == Event.KEY_PRESS || evt.id == Event.WINDOW_DESTROY) {
      hide();
      dispose();
    }
    return super.handleEvent(evt);
    
  }

  public void paint(Graphics g) {
    g.drawImage(image, 0, 0, this);
    switch (type) {
    case RED: 
      g.setColor(color1);
      Point[] points = tile.getRedPoints();
      for (int i = 0; i < points.length; i ++) 
	g.drawRect(points[ i ].x - halfSymbolSize, points[ i ].y - 
		   halfSymbolSize,2 * halfSymbolSize, 2 * halfSymbolSize);
      break;
    case COMP:
      g.setColor(color2);
      int x = tile.compOffsets[ index ].x;
      int y = tile.compOffsets[ index ].y;
      g.drawRect(x - halfSymbolSize, y - halfSymbolSize, 
		 2 * halfSymbolSize, 2 * halfSymbolSize);
      /* draw two smaller ones to make rectangle look thicker */
      g.drawRect(x - halfSymbolSize + 1, y - halfSymbolSize + 1, 
		 2 * halfSymbolSize - 2, 2 * halfSymbolSize - 2);
      g.drawRect(x - halfSymbolSize + 2, y - halfSymbolSize + 2, 
		 2 * halfSymbolSize - 4, 2 * halfSymbolSize - 4);
      break;

    case ENTIRE_RED: 
      g.setColor(color1);
      /*
      Each red tile is 512x512,there are 17x24 such tiles in the entire map.
      And the size of the tile is 26x26, so the scale is 20 
      */
      g.drawRect(tile.upperLeftCorner.x / 20, 
		 tile.upperLeftCorner.y / 20, 26, 26);
      break;

    case ENTIRE_COMP: 
      g.setColor(color2);
      /*
      Composite tile is 256x256, there are 19x29 such tiles in the entire map.
      And the size of the tile is 26x26, so the scale is 10 
      */
      for (int i = 0; i < tile.compositeNum; i++) {
	g.drawRect(tile.compCorners[ i ].x / 10, 
		   tile.compCorners[ i ].y / 10, 25, 25);
      }
      break;
    default:
    }
  }    
}