Exercícios CG ImageJ

gistfile1.java

package aulavisaocomp;

import ij.ImagePlus;
import ij.io.Opener;
import ij.process.ByteProcessor;
import ij.process.ColorProcessor;
import ij.process.ImageProcessor;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class AulaVisaoComp {
    public static void main(String[] args) throws IOException {
//        new AulaVisaoComp().drawChess();
//        new AulaVisaoComp().drawGrays();
        new AulaVisaoComp().drawChessColor();
//        new AulaVisaoComp().japanFlag();
        new AulaVisaoComp().changeChessColor();
    }
    
    void drawChess() throws IOException {
        int width = 64;
        int height = 64;
        boolean flag = false;

        ImageProcessor ip = new ByteProcessor(width, height);
//        ip.setColor(0);
//        ip.fill();
        for (int i = 0; i < width; i++) {
            if (i % 8 == 0) {
                flag = !flag;
            }
            for (int j = 0; j < height; j++) {
                if (j % 8 == 0) {
                    flag = !flag;
                }
                if (flag) {
                    ip.putPixel(i, j, 255);
                } else {
                    ip.putPixel(i, j, 0);
                }
            }
        }
        ImagePlus imp = new ImagePlus("Tabuleiro", ip);
        imp.show();
    }
    
    void drawGrays() {
        int width = 16;
        int height = 16;
        int count = 0;
        
        ImageProcessor ip = new ByteProcessor(width, height);
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                ip.putPixel(j, i, count);
                count++;
            }
        }
        ImagePlus imp = new ImagePlus("Cinzas", ip);
        imp.show();
    }
    
    void drawChessColor() throws IOException {
        int width = 256;
        int height = 256;
        boolean flag = false;

        ImageProcessor ip = new ColorProcessor(width, height);
        for (int i = 0; i < width; i++) {
            if (i % 32 == 0) {
                flag = !flag;
            }
            for (int j = 0; j < height; j++) {
                if (j % 32 == 0) {
                    flag = !flag;
                }
                if (flag) {
                    ip.putPixel(i, j, Color.YELLOW.getRGB());
                } else {
                    ip.putPixel(i, j, Color.RED.getRGB());
                }
            }
        }
        ImagePlus imp = new ImagePlus("Tabuleiro", ip);
        imp.show();
        
        ImageIO.write(ip.getBufferedImage(), "png", new File("tabuleiro.jpg"));
    }
    
    void japanFlag() {
        int width = 100;
        int height = 66;
        int centroX = 50;
        int centroY = 33;

        ImageProcessor ip = new ColorProcessor(width, height);
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                if (Math.pow(Math.pow(i - centroX, 2) + Math.pow(j - centroY, 2), 0.5) < 15) {
                    ip.putPixel(i, j, Color.RED.getRGB());
                } else {
                    ip.putPixel(i, j, Color.WHITE.getRGB());
                }
            }
        }
        ImagePlus imp = new ImagePlus("Japon", ip);
        imp.show();
    }
    
    void changeChessColor() throws IOException {
        ImagePlus imp = new Opener().openImage("tabuleiro.jpg");
        ImageProcessor ip = imp.getProcessor();
        for (int i = 0; i < imp.getWidth(); i++) {
            for (int j = 0; j < imp.getHeight(); j++) {
                if (ip.getPixel(i, j) == Color.YELLOW.getRGB()) {
                    ip.putPixel(i, j, Color.BLUE.getRGB());
                }
            }
        }
        ImagePlus imp2 = new ImagePlus("Tabuleiro azul", ip);
        imp2.show();
        
        ImageIO.write(ip.getBufferedImage(), "png", new File("tabuleiro_azul.jpg"));
    }
}