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TextBouncer.javaAPI DocExample6221Mon Apr 05 12:10:48 BST 1999None

TextBouncer

public class TextBouncer extends AnimationComponent

Fields Summary
private boolean
mAntialiasing
private boolean
mGradient
private boolean
mShear
private boolean
mRotate
private boolean
mAxes
public static final int
ANTIALIASING
public static final int
GRADIENT
public static final int
SHEAR
public static final int
ROTATE
public static final int
AXES
private float
mDeltaX
private float
mDeltaY
private float
mX
private float
mY
private float
mWidth
private float
mHeight
private float
mTheta
private float
mShearX
private float
mShearY
private float
mShearDeltaX
private float
mShearDeltaY
private String
mString
Constructors Summary
public TextBouncer(String s, Font f)

  
       
    mString = s;
    setFont(f);
    Random random = new Random();
    mX = random.nextFloat() * 500;
    mY = random.nextFloat() * 500;
    mDeltaX = random.nextFloat() * 3;
    mDeltaY = random.nextFloat() * 3;
    mShearX = random.nextFloat() / 2;
    mShearY = random.nextFloat() / 2;
    mShearDeltaX = mShearDeltaY = .05f;
    FontRenderContext frc = new FontRenderContext(null, true, false);
    Rectangle2D bounds = getFont().getStringBounds(mString, frc);
    mWidth = (float)bounds.getWidth();
    mHeight = (float)bounds.getHeight();
    // 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;
protected voiddrawAxes(java.awt.Graphics2D g2)

    if (mAxes == false) return;
    g2.setPaint(getForeground());
    g2.setStroke(new BasicStroke());
    Dimension d = getSize();
    int side = 20;
    int arrow = 4;
    int w = d.width / 2, h = d.height / 2;
    g2.drawLine(w - side, h, w + side, h);
    g2.drawLine(w + side - arrow, h - arrow, w + side, h);
    g2.drawLine(w, h - side, w, h + side);
    g2.drawLine(w + arrow, h + side - arrow, w, h + side);
public static voidmain(java.lang.String[] args)

    String s = "Firenze";
    final int size = 64;
    if (args.length > 0) s = args[0];
    
    Panel controls = new Panel();
    final Choice choice = new Choice();
    GraphicsEnvironment ge =
        GraphicsEnvironment.getLocalGraphicsEnvironment();
    Font[] allFonts = ge.getAllFonts();
    for (int i = 0; i < allFonts.length; i++)
      choice.addItem(allFonts[i].getName());
    Font defaultFont = new Font(allFonts[0].getName(), Font.PLAIN, size);

    final TextBouncer bouncer = new TextBouncer(s, defaultFont);
    Frame f = new AnimationFrame(bouncer);
    f.setFont(new Font("Serif", Font.PLAIN, 12));
    controls.add(bouncer.createCheckbox("Antialiasing",
        TextBouncer.ANTIALIASING));
    controls.add(bouncer.createCheckbox("Gradient", TextBouncer.GRADIENT));
    controls.add(bouncer.createCheckbox("Shear", TextBouncer.SHEAR));
    controls.add(bouncer.createCheckbox("Rotate", TextBouncer.ROTATE));
    controls.add(bouncer.createCheckbox("Axes", TextBouncer.AXES));
    
    Panel fontControls = new Panel();
    choice.addItemListener(new ItemListener() {
      public void itemStateChanged(ItemEvent ie) {
        Font font = new Font(choice.getSelectedItem(), Font.PLAIN, size);
        bouncer.setFont(font);
      }
    });
    fontControls.add(choice);
    
    Panel allControls = new Panel(new GridLayout(2, 1));
    allControls.add(controls);
    allControls.add(fontControls);
    f.add(allControls, BorderLayout.NORTH);
    
    f.setVisible(true);
public voidpaint(java.awt.Graphics g)

    Graphics2D g2 = (Graphics2D)g;
    setAntialiasing(g2);
    setTransform(g2);
    setPaint(g2);
    // Draw the string.
    g2.setFont(getFont());
    g2.drawString(mString, mX, mY + mHeight);
    drawAxes(g2);
protected voidsetAntialiasing(java.awt.Graphics2D g2)

    if (mAntialiasing == false) return;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
protected voidsetPaint(java.awt.Graphics2D g2)

    if (mGradient) {
      GradientPaint gp = new GradientPaint(0, 0, Color.blue,
          50, 25, Color.green, true);
      g2.setPaint(gp);
    }
    else g2.setPaint(Color.orange);
public voidsetSwitch(int item, boolean value)

    switch(item) {
      case ANTIALIASING: mAntialiasing = value; break;
      case GRADIENT: mGradient = value; break;
      case SHEAR: mShear = value; break;
      case ROTATE: mRotate = value; break;
      case AXES: mAxes = value; break;
      default: break;
    }
protected voidsetTransform(java.awt.Graphics2D g2)

    Dimension d = getSize();
    int cx = d.width / 2;
    int cy = d.height / 2;
    g2.translate(cx, cy);
    if (mShear) g2.shear(mShearX, mShearY);
    if (mRotate) g2.rotate(mTheta);
    g2.translate(-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);
    
    if (mShearX + mShearDeltaX > .5) mShearDeltaX = -mShearDeltaX;
    else if (mShearX + mShearDeltaX < -.5) mShearDeltaX = -mShearDeltaX;
    if (mShearY + mShearDeltaY > .5) mShearDeltaY = -mShearDeltaY;
    else if (mShearY + mShearDeltaY < -.5) mShearDeltaY = -mShearDeltaY;
    mShearX += mShearDeltaX;
    mShearY += mShearDeltaY;