Creating a Image Zoomer using Graphics2D : BufferedImage « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. BufferedImage

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;

import javax.swing.JPanel;

class ImagePanel extends JPanel {
  private double zoom = 1.0;

  private double percentage;

  private Image image;

  public ImagePanel(Image image, double zoomPercentage) {
    this.image = image;
    percentage = zoomPercentage / 100;
  }

  public void paintComponent(Graphics grp) {
    Graphics2D g2D = (Graphics2D) grp;
    g2D.scale(zoom, zoom);
    g2D.drawImage(image, 0, 0, this);
  }

  public void setZoomPercentage(int zoomPercentage) {
    percentage = ((double) zoomPercentage) / 100;
  }

  public void originalSize() {
    zoom = 1;
  }

  public void zoomIn() {
    zoom += percentage;
  }

  public void zoomOut() {
    zoom -= percentage;

    if (zoom < percentage) {
      if (percentage > 1.0) {
        zoom = 1.0;
      } else {
        zoomIn();
      }
    }
  }
}