How to use

getClipBounds

method

in

java.awt.Graphics

 private class TransparentPanel extends JPanel {
  {
    setOpaque(false);
  }
  public void paintComponent(Graphics g) {
    g.setColor(getBackground());
    Rectangle r = g.getClipBounds();
    g.fillRect(r.x, r.y, r.width, r.height);
    super.paintComponent(g);
  }
}

Insets insets = getInsets();
int availableWidth = size.width - insets.left - insets.right;
Rectangle clip = g.getClipBounds();
int rowStartOffset = codeArea.viewToModel(new Point(0, clip.y));
int endOffset = codeArea.viewToModel(new Point(0, clip.y + clip.height));

@Override
public void paint(Graphics g, JComponent c) {
  Rectangle clipBounds = g.getClipBounds();
  if (header.getColumnModel() == null) {
    return;

Rectangle clip = g.getClipBounds();
int rowStartOffset = component.viewToModel(new Point(0, clip.y));
int endOffset = component.viewToModel(new Point(0, clip.y + clip.height));

@Override
protected void paintComponent(Graphics g) {
 Rectangle drawHere = g.getClipBounds();

Rectangle rect = graphics.getClipBounds();
graphics.setClip(rect.x, 0, rect.width, (int) paper.getHeight() + 100);

configureFormatter();
double lineDistance = getLineDistance();
Rectangle clip = g.getClipBounds();
g.clearRect(clip.x, clip.y, clip.width, clip.height);
g.setColor(Color.black);

 @Override
 protected void paintComponent(Graphics g) {
  super.paintComponent(g);
  Rectangle bounds = g.getClipBounds();
  int index = 0;
  for (String name : shortLineNames.keySet()) {
   int nameWidth = g.getFontMetrics().stringWidth(name);
   int lineX = lineStep * index;
   index++;
   if (bounds.getMaxX() < lineX || bounds.getMinX() > lineX + nameWidth) {
    continue;
   }
   g.setClip(lineX + LINE_LABEL_BOUNDARY, 0, lineStep - +LINE_LABEL_BOUNDARY * 2, getHeight());
   g.drawString(name, lineX + LINE_LABEL_BOUNDARY, AXIS_SIZE / 3);
   g.setClip(null);
  }
 }
}

Rectangle clipBounds = componentGraphics.getClipBounds();
if(clipBounds == null) {
  clipBounds = new Rectangle(0, 0, getWidth(), getHeight());

@Override
public void paint(Graphics g) {
  g.setColor(color);
  Rectangle r = g.getClipBounds();
  g.fillRect(r.x, r.y, r.width, r.height);
}

private void drawRed(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color c = new Color((float) i / width, green, blue);
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

private void drawAlpha(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color c = new Color(red, green, blue, (float) i / width);
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

private void drawBlue(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color c = new Color(red, green, (float) i / width);
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

private void drawGreen(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color c = new Color(red, (float) i / width, blue);
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

private void drawHue(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color hsb = Color.getHSBColor((float) i / width, saturation, brightness);
    Color c = new Color(hsb.getRed(), hsb.getGreen(), hsb.getBlue());
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

private void drawBrightness(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color hsb = Color.getHSBColor(hue, saturation, (float) i / width);
    Color c = new Color(hsb.getRed(), hsb.getGreen(), hsb.getBlue());
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

@Override
public void paint(Graphics g) {
  g.setColor(color.getAwtColor());
  Rectangle r = g.getClipBounds();
  g.fillRect(r.x, r.y, r.width, r.height);
}

private void drawSaturation(Graphics g) {
  Rectangle r = g.getClipBounds();
  int width = r.width - WIDTH_OFFSET;
  for (int i = 0; i < width; i++) {
    Color hsb = Color.getHSBColor(hue, (float) i / width, brightness);
    Color c = new Color(hsb.getRed(), hsb.getGreen(), hsb.getBlue());
    g.setColor(c);
    g.fillRect(i + HALF_WIDTH_OFFSET, 0, 1, r.height - HEIGHT_OFFSET);
  }
}

@Override
protected void paintBackground(Graphics g) {
  // Only fill in the background if an image isn't being used.
  Color bg = textArea.getBackground();
  if (bg!=null) {
    g.setColor(bg);
    //g.fillRect(0, 0, textArea.getWidth(), textArea.getHeight());
    Rectangle r = g.getClipBounds();
    g.fillRect(r.x,r.y, r.width,r.height);
  }
  paintEditorAugmentations(g);
}

  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    // #9804. Draw bullet if the content is not numbered.
    if (!WrappedCellRenderer.this.contentNumbered) {
      java.awt.Rectangle rect = g.getClipBounds();
      g.fillOval(rect.x, rect.y, 7, 7);
    }
  }
};