Here we go:
I have 3 classes, color, palette and image.
The color:
package ici.data;
/**
* This class represents a color to be inserted and used in the color palette.
* @author Rafael Carvallo
*/
public class Color3i{
public int r,g,b;
public Color3i(){
r = g = b = 0;
}
public Color3i(int r, int g, int b){
this.r = r;
this.g = g;
this.b = b;
}
public String toString(){
return r+" "+g+" "+b;
}
}
The palette:
package ici.data;
import java.awt.image.*;
import java.util.*;
/**
* Class that represents the palette for the image.
* The first color is always transparent in the drawing.
* @author Rafael Carvallo
*/
public class ICPalette {
Vector colores;
public ICPalette(){
colores = new Vector();
}
public IndexColorModel getICM(){
int cc = colores.size();
if(cc > 0){
byte[] data = new byte[cc*3];
int k = 0;
for(Enumeration i = colores.elements();i.hasMoreElements();){
Color3i c3i = (Color3i)i.nextElement();
data[k++] = (byte)(c3i.r);
data[k++] = (byte)(c3i.g);
data[k++] = (byte)(c3i.b);
}
return new IndexColorModel(8,cc,data,0,false,0);
}
return null;
}
public void insertColor(int r, int g, int b){
Color3i c3i = new Color3i(r,g,b);
colores.addElement(c3i);
}
public void deleteColor(int index){
colores.removeElementAt(index);
}
public void updateColor(int index, int r, int g, int b){
Color3i c3i = (Color3i)(colores.elementAt(index));
c3i.r = r;
c3i.g = g;
c3i.b = b;
}
public int getColorCount(){
return colores.size();
}
public Vector getColorVector(){
return colores;
}
public Color3i getColor(int index){
return (Color3i)colores.elementAt(index);
}
}
The image:
package ici.data;
import java.awt.*;
import java.awt.image.*;
import java.util.*;
/**
* This class represents an image independent from the palette.
* @author Rafael Carvallo
*
*/
public class ICImage {
int[] data;
int w,h;
public ICImage(){
}
public ICImage(int W, int H) {
w = W;
h = H;
data = new int[w*h];
}
/** Generates the image with the data defined and the the palette passed.
* @param pal An ICPalette to be used in the creation of the image.
*/
public BufferedImage getImage(ICPalette pal){
IndexColorModel cm1 = pal.getICM();
BufferedImage im = new BufferedImage(w,h,BufferedImage.TYPE_BYTE_INDEXED,cm1);
WritableRaster rast=im.getRaster();
rast.setPixels(0,0,w,h,data);
return im;
}
public int[][] getPixelArray(){
//generate the array
int[][] arr = new int[w][h];
for(int i = 0; i<w;i++){
for(int j = 0; j<h;j++){
arr[i][j] = data[i+j*h];
}
}
return arr;
}
public void setPixelArray(int[][] arr){
//extract all the information
w = arr.length;
h = arr[0].length;
data = new int[w*h];
for(int i = 0; i<w;i++){
for(int j = 0; j<h;j++){
data[j*h+i] = arr[i][j];
}
}
}
public void setPixel(int x, int y, int index){
data[y*h+x]=index;
}
public Dimension getSize(){
return new Dimension(w,h);
}
}
A test:
import ici.data.ICImage;
import ici.data.ICPalette;
import java.awt.*;
import javax.swing.JFrame;
class Test extends Canvas
{
public static final int WIDTH=250;
public static final int HEIGHT=250;
Image i1, i2;
public Test(){
ICPalette palette1 = new ICPalette();
palette1.insertColor(255,255,255); //white transparent
palette1.insertColor(255,0,0); //red
palette1.insertColor(200,0,0); //less red
palette1.insertColor(150,0,0); //less red
palette1.insertColor(100,0,0); //less red
ICPalette palette2 = new ICPalette();
palette2.insertColor(255,255,255); //white transparent
palette2.insertColor(0,0,255); //blue
palette2.insertColor(0,0,200); //less blue
palette2.insertColor(0,0,150); //less blue
palette2.insertColor(0,0,100); //less blue
ICImage image = new ICImage(100,100);
for (int i = 0; i < 100; i++) {
for (int j = 0; j < 100; j++) {
if(i < 25){
image.setPixel(i,j,1);
}
else if(i > 75){
image.setPixel(i,j,2);
}
else if(j < 25){
image.setPixel(i,j,3);
}
else if(j > 75){
image.setPixel(i,j,4);
}
else{
image.setPixel(i,j,0);
}
}
}
i1 = image.getImage(palette1);
i2 = image.getImage(palette2);
}
public void paint(Graphics g){
g.drawImage(i1,40,40,this);
g.drawImage(i2,70,80,this);
}
public static void main(String[] args)
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new Test());
f.setSize(WIDTH,HEIGHT);
f.setVisible(true);
}
}
Hope this helps you.
Rafael.-
