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ImageCanvas.java

package gov.nasa.arc.ase.ltl;

// Written by ckong - Sept 6, 2001
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.geom.AffineTransform;

class ImageCanvas extends Canvas {

  Image image = null;
  float degree = 1;
  MediaTracker tracker = new MediaTracker(this);
  int canvasHeight = 600;
  int canvasWidth = 600;
  ImagePanel pane;

  public ImageCanvas(ImagePanel pane) {
    this.pane = pane;
  }  
  public Dimension getPreferredSize() {
    return new Dimension(canvasWidth, canvasHeight);
  }  
  public void increase() {
    degree = degree + (float)0.1;
    if (degree > 2)
      degree = 2;
  }  
  public void paint(Graphics g) {
    //System.out.println("In canvas.paint");
    if (image != null) {
      int width = image.getWidth(this);
      int height = image.getHeight(this);
      int newWidth = Math.round((float)width * degree);
      int newHeight = Math.round((float)height * degree);
      if (newWidth > getWidth() || newHeight > getHeight()) {
        setSize(newWidth+5, newHeight+5);
        canvasWidth = newWidth+5;
        canvasHeight = newHeight+5;
      }
      //Draw image scaled.
      if (tracker.statusID(0, false) == MediaTracker.COMPLETE) {
        g.drawImage(image, 0, 0, newWidth, newHeight, this);
        pane.doLayout();
      }
    }
    
  }  
  public void reduce() {
    degree = degree - (float)0.1;
    if (degree < 0.5)
      degree = (float)0.5;
  }  
  public void setImage(Image imageIn) {
    image = imageIn;
    tracker.addImage(image, 0);
  }  
  public void setNormal() {
    degree = 1;
  }  
}

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