Use AffineTransform to place Roman numerals on an analog clock face

• download example.jar
• download src.zip
• repository

Code

private final String[] arabicNumerals = {
  "12", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11"
};
private final String[] romanNumerals = {
  "XII", "I", "II", "III", "IIII", "V", "VI", "VII", "VIII", "IX", "X", "XI"
};

private void paintClockNumbers(
    Graphics2D g2, double radius, double hourMarkerLen) {
  AffineTransform at = AffineTransform.getRotateInstance(0d);
  g2.setColor(Color.WHITE);
  Font font = g2.getFont();
  FontRenderContext frc = g2.getFontRenderContext();
  if (isRomanNumerals) {
    AffineTransform si = AffineTransform.getScaleInstance(1d, 2d);
    for (String txt : romanNumerals) {
      Shape s = getTextLayout(txt, font, frc).getOutline(si);
      Rectangle2D r = s.getBounds2D();
      double tx = r.getCenterX();
      double ty = radius - hourMarkerLen - r.getHeight() + r.getCenterY() * .5;
      Shape t = AffineTransform.getTranslateInstance(-tx, -ty)
                               .createTransformedShape(s);
      g2.fill(at.createTransformedShape(t));
      at.rotate(Math.PI / 6d);
    }
  } else {
    Point2D ptSrc = new Point2D.Double();
    for (String txt : arabicNumerals) {
      Shape s = getTextLayout(txt, font, frc).getOutline(null);
      Rectangle2D r = s.getBounds2D();
      double ty = radius - hourMarkerLen - r.getHeight() - r.getCenterY() * .5;
      ptSrc.setLocation(0d, -ty);
      Point2D pt = at.transform(ptSrc, null);
      double dx = pt.getX() - r.getCenterX();
      double dy = pt.getY() - r.getCenterY();
      // g2.drawString(txt, (float) dx, (float) dy);
      g2.fill(AffineTransform.getTranslateInstance(dx, dy)
        .createTransformedShape(s));
      at.rotate(Math.PI / 6d);
    }
  }
}

private static TextLayout getTextLayout(
    String txt, Font font, FontRenderContext frc) {
  return new TextLayout(txt, font, frc);
}

References

• Use AffineTransform to place Roman numerals on an analog clock face(Japanese)
• Java Swing Tips: Drawing Analog Clock Hands in JPanel using Timer

Using drop caps on a JLabel

• download example.jar
• download src.zip
• repository

Code

@Override protected void paintComponent(Graphics g) {
  Graphics2D g2 = (Graphics2D) g.create();
  g2.setPaint(getBackground());
  g2.fillRect(0, 0, getWidth(), getHeight());

  Insets i = getInsets();
  float x0 = i.left;
  float y0 = i.top;

  Font font = getFont();
  String txt = getText();

  AttributedString as = new AttributedString(txt.substring(1));
  as.addAttribute(TextAttribute.FONT, font);
  AttributedCharacterIterator aci = as.getIterator();
  FontRenderContext frc = g2.getFontRenderContext();

  Shape shape = new TextLayout(txt.substring(0, 1), font, frc).getOutline(null);

  AffineTransform at1 = AffineTransform.getScaleInstance(5d, 5d);
  Shape s1 = at1.createTransformedShape(shape);
  Rectangle r = s1.getBounds();
  r.grow(6, 2);
  int rw = r.width;
  int rh = r.height;

  AffineTransform at2 = AffineTransform.getTranslateInstance(x0, y0 + rh);
  Shape s2 = at2.createTransformedShape(s1);
  g2.setPaint(getForeground());
  g2.fill(s2);

  float x = x0 + rw;
  float y = y0;
  int w0 = getWidth() - i.left - i.right;
  int w = w0 - rw;
  LineBreakMeasurer lbm = new LineBreakMeasurer(aci, frc);
  while (lbm.getPosition() < aci.getEndIndex()) {
    TextLayout tl = lbm.nextLayout(w);
    tl.draw(g2, x, y + tl.getAscent());
    y += tl.getDescent() + tl.getLeading() + tl.getAscent();
    if (y0 + rh < y) {
      x = x0;
      w = w0;
    }
  }
  g2.dispose();
}

References

• Using drop caps on a JLabel(Japanese)