Clip the area : Clip « 2D Graphics GUI « Java

1. Java
2. 2D Graphics GUI
3. Clip

Clip the area

   
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class ClipDemo extends JComponent {
  private static Color red = new Color(255, 0, 0, 150);

  private static Color green = new Color(0, 255, 0, 150);

  private static Color blue = new Color(0, 0, 255, 150);

  private static Font monoFont = new Font("Monospaced", Font.BOLD
      | Font.ITALIC, 36);

  private static Font sanFont = new Font("SanSerif", Font.PLAIN, 12);

  private static Font serifFont = new Font("Serif", Font.BOLD, 24);

  private static ImageIcon java2sLogo = new ImageIcon("java2sLogo.gif");

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    // get damaged region
    Rectangle clipRect = g.getClipBounds();
    int clipx = clipRect.x;
    int clipy = clipRect.y;
    int clipw = clipRect.width;
    int cliph = clipRect.height;

    // fill damaged region only
    g.setColor(Color.white);
    g.fillRect(clipx, clipy, clipw, cliph);

    if (clipx <= 240 && clipy <= 240) {
      g.setColor(Color.yellow);
      g.fillOval(0, 0, 240, 240);
      System.out.println(" yellow Oval repainted.");
    }

    if (clipx + clipw >= 160 && clipx <= 400 && clipy + cliph >= 160
        && clipy <= 400) {
      g.setColor(Color.magenta);
      g.fillOval(160, 160, 240, 240);
      System.out.println(" magenta Oval repainted.");
    }

    int iconWidth = java2sLogo.getIconWidth();
    int iconHeight = java2sLogo.getIconHeight();

    if (clipx + clipw >= 280 - (iconWidth / 2) && clipx <= (280 + (iconWidth / 2))
        && clipy + cliph >= 120 - (iconHeight / 2) && clipy <= (120 + (iconHeight / 2))) {
      java2sLogo.paintIcon(this, g, 280 - (iconWidth / 2), 120 - (iconHeight / 2));
      System.out.println(" logo below blue Rect repainted.");
    }

    if (clipx + clipw >= 120 - (iconWidth / 2) && clipx <= (120 + (iconWidth / 2))
        && clipy + cliph >= 280 - (iconHeight / 2) && clipy <= (280 + (iconHeight / 2))) {
      java2sLogo.paintIcon(this, g, 120 - (iconWidth / 2), 280 - (iconHeight / 2));
      System.out.println(" logo below red Rect repainted.");
    }

    if (clipx + clipw >= 60 && clipx <= 180 && clipy + cliph >= 220
        && clipy <= 340) {
      g.setColor(red);
      g.fillRect(60, 220, 120, 120);
      System.out.println(" red Rect repainted.");

    }

    if (clipx + clipw > 140 && clipx < 260 && clipy + cliph > 140
        && clipy < 260) {
      g.setColor(green);
      g.fillOval(140, 140, 120, 120);
      System.out.println(" green Oval repainted.");

    }

    if (clipx + clipw > 220 && clipx < 380 && clipy + cliph > 60
        && clipy < 180) {
      g.setColor(blue);
      g.fillRect(220, 60, 120, 120);
      System.out.println(" blue Rect repainted.");
    }

    g.setColor(Color.black);

    g.setFont(monoFont);
    FontMetrics fm = g.getFontMetrics();
    iconWidth = fm.stringWidth("Java Source");
    iconHeight = fm.getAscent();
    int d = fm.getDescent();
    if (clipx + clipw > 120 - (iconWidth / 2) && clipx < (120 + (iconWidth / 2))
        && clipy + cliph > (120 + (iconHeight / 4)) - iconHeight
        && clipy < (120 + (iconHeight / 4)) + d) {
      g.drawString("Java Source", 120 - (iconWidth / 2), 120 + (iconHeight / 4));
      System.out.println(" Java Source repainted.");
    }

    g.setFont(sanFont);
    fm = g.getFontMetrics();
    iconWidth = fm.stringWidth("and");
    iconHeight = fm.getAscent();
    d = fm.getDescent();
    if (clipx + clipw > 200 - (iconWidth / 2) && clipx < (200 + (iconWidth / 2))
        && clipy + cliph > (200 + (iconHeight / 4)) - iconHeight
        && clipy < (200 + (iconHeight / 4)) + d) {
      g.drawString("and", 200 - (iconWidth / 2), 200 + (iconHeight / 4));
      System.out.println(" and repainted.");
    }

    g.setFont(serifFont);
    fm = g.getFontMetrics();
    iconWidth = fm.stringWidth("Support.");
    iconHeight = fm.getAscent();
    d = fm.getDescent();

    if (clipx + clipw > 280 - (iconWidth / 2) && clipx < (280 + (iconWidth / 2))
        && clipy + cliph > (280 + (iconHeight / 4)) - iconHeight
        && clipy < (280 + (iconHeight / 4)) + d) {
      g.drawString("Support.", 280 - (iconWidth / 2), 280 + (iconHeight / 4));
      System.out.println(" Support. repainted.");
    }
  }

  public Dimension getPreferredSize() {
    return new Dimension(400, 400);
  }

  public Dimension getMinimumSize() {
    return getPreferredSize();
  }

  public static void main(String args[]) {
    JFrame mainFrame = new JFrame();
    mainFrame.getContentPane().add(new ClipDemo());
    mainFrame.pack();

    mainFrame.setVisible(true);
  }

}

           
         
    
    
  

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