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();
      }
    }
  }
}








16.27.BufferedImage
16.27.1.Create BufferredImage with colors based on integer array
16.27.2.Creating a BufferedImage from an Image object
16.27.3.A buffered image is a type of image whose pixels can be modified.
16.27.4.BufferedImage.TYPE_INT_RGB
16.27.5.TYPE_INT_RGB and TYPE_INT_ARGB are typically used
16.27.6.Create buffered image that does not support transparency
16.27.7.Create a buffered image that supports transparency
16.27.8.Create an image that does not support transparency
16.27.9.Create an image that supports transparent pixels
16.27.10.Create an image that supports arbitrary levels of transparency
16.27.11.Creating a buffered image using Component.createImage().
16.27.12.Creating a Buffered Image from an Image
16.27.13.Drawing on a Buffered Image
16.27.14.If the buffered image supports transparency
16.27.15.Converting a Buffered Image (BufferedImage) from an Image
16.27.16.Getting and Setting Pixels in a Buffered Image
16.27.17.Scaling a Buffered Image
16.27.18.Shearing a Buffered Image
16.27.19.Translating a Buffered Image
16.27.20.Rotating a Buffered Image
16.27.21.Flipping a Buffered Image
16.27.22.Flip the image horizontally
16.27.23.Flip the image vertically and horizontally, equivalent to rotating the image 180 degrees
16.27.24.Converting a Colored Buffered Image to Gray
16.27.25.Creating a Image Zoomer using Graphics2D
16.27.26.Create Gradient Image
16.27.27.Create Gradient Mask
16.27.28.Create Headless BufferedImage
16.27.29.Create Translucent Image
16.27.30.If the image has transparent pixels
16.27.31.Produces a copy of the supplied image
16.27.32.Produces a resized image that is of the given dimensions
16.27.33.Creates and returns a buffered version of the specified image.