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ImageBouncer.javaAPI DocExample5062Mon Apr 05 12:13:20 BST 1999None

ImageBouncer

public class ImageBouncer extends AnimationComponent

Fields Summary
private boolean
mBilinear
private boolean
mTransform
public static final int
BILINEAR
public static final int
TRANSFORM
private float
mDeltaX
private float
mDeltaY
private float
mX
private float
mY
private float
mWidth
private float
mHeight
private float
mTheta
private Image
mOriginalImage
private BufferedImage
mImage
Constructors Summary
public ImageBouncer(Image image)

  
     
    mOriginalImage = image;
    setImageType("TYPE_INT_RGB");

    Random random = new Random();
    mX = random.nextFloat() * 500;
    mY = random.nextFloat() * 500;
    mWidth = mImage.getWidth();
    mHeight = mImage.getHeight();
    mDeltaX = random.nextFloat() * 3;
    mDeltaY = random.nextFloat() * 3;
    // Make sure points are within range.
    addComponentListener(new ComponentAdapter() {
      public void componentResized(ComponentEvent ce) {
        Dimension d = getSize();
        if (mX < 0) mX = 0;
        else if (mX + mWidth >= d.width) mX = d.width - mWidth - 1;
        if (mY < 0) mY = 0;
        else if (mY + mHeight >= d.height) mY = d.height - mHeight - 1;
      }
    });
Methods Summary
protected java.awt.CheckboxcreateCheckbox(java.lang.String label, int item)

    Checkbox check = new Checkbox(label);
    check.addItemListener(new ItemListener() {
      public void itemStateChanged(ItemEvent ie) {
        setSwitch(item, (ie.getStateChange() == ie.SELECTED));
      }
    });
    return check;
public static voidmain(java.lang.String[] args)

    String filename = "knudsen.gif";
    if (args.length > 0) filename = args[0];
    
    Image image = Utilities.blockingLoad(filename);
    
    final ImageBouncer bouncer = new ImageBouncer(image);
    Frame f = new AnimationFrame(bouncer);
    f.setFont(new Font("Serif", Font.PLAIN, 12));
    Panel controls = new Panel();
    controls.add(bouncer.createCheckbox("Bilinear", ImageBouncer.BILINEAR));
    controls.add(bouncer.createCheckbox("Transform",ImageBouncer.TRANSFORM));
    final Choice typeChoice = new Choice();
    typeChoice.add("TYPE_INT_RGB");
    typeChoice.add("TYPE_INT_ARGB");
    typeChoice.add("TYPE_INT_ARGB_PRE");
    typeChoice.add("TYPE_3BYTE_BGR");
    typeChoice.add("TYPE_BYTE_GRAY");
    typeChoice.add("TYPE_USHORT_GRAY");
    typeChoice.add("TYPE_USHORT_555_RGB");
    typeChoice.add("TYPE_USHORT_565_RGB");
    controls.add(typeChoice);
    f.add(controls, BorderLayout.NORTH);
    
    typeChoice.addItemListener(new ItemListener() {
      public void itemStateChanged(ItemEvent ie) {
        String type = typeChoice.getSelectedItem();
        bouncer.setImageType(type);
      }
    });
    
    f.setVisible(true);
public voidpaint(java.awt.Graphics g)

    Graphics2D g2 = (Graphics2D)g;
    setTransform(g2);
    setBilinear(g2);
    // Draw the image.
    g2.drawImage(mImage, AffineTransform.getTranslateInstance(mX, mY), null);
protected voidsetBilinear(java.awt.Graphics2D g2)

    if (mBilinear == false) return;
    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
        RenderingHints.VALUE_INTERPOLATION_BILINEAR);
public voidsetImageType(java.lang.String s)

    int type = BufferedImage.TYPE_CUSTOM;
    if (s.equals("TYPE_INT_RGB"))
      type = BufferedImage.TYPE_INT_RGB;
    else if (s.equals("TYPE_INT_ARGB"))
      type = BufferedImage.TYPE_INT_ARGB;
    else if (s.equals("TYPE_INT_ARGB_PRE"))
      type = BufferedImage.TYPE_INT_ARGB_PRE;
    else if (s.equals("TYPE_3BYTE_BGR"))
      type = BufferedImage.TYPE_3BYTE_BGR;
    else if (s.equals("TYPE_BYTE_GRAY"))
      type = BufferedImage.TYPE_BYTE_GRAY;
    else if (s.equals("TYPE_USHORT_GRAY"))
      type = BufferedImage.TYPE_USHORT_GRAY;
    else if (s.equals("TYPE_USHORT_555_RGB"))
      type = BufferedImage.TYPE_USHORT_565_RGB;
    else if (s.equals("TYPE_USHORT_565_RGB"))
      type = BufferedImage.TYPE_USHORT_565_RGB;
    else {
      System.out.println("Unrecognized type.");
      return;
    }
    mImage = Utilities.makeBufferedImage(mOriginalImage, type);
public voidsetSwitch(int item, boolean value)

    switch(item) {
      case BILINEAR: mBilinear = value; break;
      case TRANSFORM: mTransform = value; break;
      default: break;
    }
protected voidsetTransform(java.awt.Graphics2D g2)

    if (mTransform == false) return;
    float cx = mX + mWidth / 2;
    float cy = mY + mHeight / 2;
    g2.rotate(mTheta, cx, cy);
public voidtimeStep()

    Dimension d = getSize();
    if (mX + mDeltaX < 0) mDeltaX = -mDeltaX;
    else if (mX + mWidth + mDeltaX >= d.width) mDeltaX = -mDeltaX;
    if (mY + mDeltaY < 0) mDeltaY = -mDeltaY;
    else if (mY + mHeight + mDeltaY >= d.height) mDeltaY = -mDeltaY;
    mX += mDeltaX;
    mY += mDeltaY;
    
    mTheta += Math.PI / 192;
    if (mTheta > (2 * Math.PI)) mTheta -= (2 * Math.PI);