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Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer1-0/OFImage.java

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+import java.awt.*;
+import java.awt.image.*;
+import javax.swing.*;
+
+/**
+ * OFImage is a class that defines an image in OF (Objects First) format.
+ * 
+ * @author Michael Kölling and David J. Barnes.
+ * @version 1.1
+ */
+public class OFImage extends BufferedImage
+{
+    /**
+     * Create an OFImage copied from a BufferedImage.
+     * @param image The image to copy.
+     */
+    public OFImage(BufferedImage image)
+    {
+         super(image.getColorModel(), image.copyData(null), 
+               image.isAlphaPremultiplied(), null);
+    }
+
+    /**
+     * Create an OFImage with specified size and unspecified content.
+     * @param width The width of the image.
+     * @param height The height of the image.
+     */
+    public OFImage(int width, int height)
+    {
+        super(width, height, TYPE_INT_RGB);
+    }
+
+    /**
+     * Set a given pixel of this image to a specified color. The
+     * color is represented as an (r,g,b) value.
+     * @param x The x position of the pixel.
+     * @param y The y position of the pixel.
+     * @param col The color of the pixel.
+     */
+    public void setPixel(int x, int y, Color col)
+    {
+        int pixel = col.getRGB();
+        setRGB(x, y, pixel);
+    }
+    
+    /**
+     * Get the color value at a specified pixel position.
+     * @param x The x position of the pixel.
+     * @param y The y position of the pixel.
+     * @return The color of the pixel at the given position.
+     */
+    public Color getPixel(int x, int y)
+    {
+        int pixel = getRGB(x, y);
+        return new Color(pixel);
+    }
+
+    /**
+     * Make this image a bit darker.
+     */
+    public void darker()
+    {
+        int height = getHeight();
+        int width = getWidth();
+        for(int y = 0; y < height; y++) {
+            for(int x = 0; x < width; x++) {
+                setPixel(x, y, getPixel(x, y).darker());
+            }
+        }
+    }
+
+    /**
+     * Make this image a bit lighter.
+     */
+    public void lighter()
+    {
+        int height = getHeight();
+        int width = getWidth();
+        for(int y = 0; y < height; y++) {
+            for(int x = 0; x < width; x++) {
+                setPixel(x, y, getPixel(x, y).brighter());
+            }
+        }
+    }
+
+    /**
+     * Perform a three level threshold operation.
+     * That is: repaint the image with only three color values:
+     *          white, gray, and black.
+     */
+    public void threshold()
+    {
+        int height = getHeight();
+        int width = getWidth();
+        for(int y = 0; y < height; y++) {
+            for(int x = 0; x < width; x++) {
+                Color pixel = getPixel(x, y);
+                int brightness = (pixel.getRed() + pixel.getBlue() + pixel.getGreen()) / 3;
+                if(brightness <= 85) {
+                    setPixel(x, y, Color.BLACK);
+                }
+                else if(brightness <= 170) {
+                    setPixel(x, y, Color.GRAY);
+                }
+                else {
+                    setPixel(x, y, Color.WHITE);
+                }
+            }
+        }
+    }
+}