Ardoise.java
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package tp2.ArdoiseMagique;
import javax.swing.*;
import java.awt.*;
public class Ardoise extends JPanel {
private final int defaultWidth = 1000;
private final int defaultHeight = 600;
protected static final int BLACK = 1;
protected static final int WHITE = 0;
private int oldx = -1;
private int oldy = -1;
private final int[][] pixelArray = new int[defaultWidth][defaultHeight];
public Ardoise() {
super();
this.setSize(defaultWidth, defaultHeight);
wipe();
}
public void wipe() {
for (int i = 0; i < defaultWidth; ++i){
for (int j = 0; j < defaultHeight; ++j){
pixelArray[i][j] = WHITE;
}
}
repaint();
}
public void setPixel(int x, int y, int color){
if (x < 0 || y < 0 || x >= defaultWidth || y >= defaultHeight){
return;
}
if (oldx == -1 || oldy == -1){
oldx = x;
oldy = y;
}
plotLine(oldx, oldy, x, y);
oldx = x;
oldy = y;
System.out.println("tried to put a "+(color==BLACK?"black":"white")+" pixel at "+Integer.toString(x)+" "+Integer.toString(x));
pixelArray[x][y] = color;
repaint();
}
public void plotLineLow(int x0, int y0, int x1, int y1){
int dx = x1 - x0;
int dy = y1 - y0;
int yi = 1;
if (dy < 0) {
yi = -1;
dy = -dy;
}
int D = (2 * dy) - dx;
int ay = y0;
for (int ax = x0; ax < x1; ++ax) {
pixelArray[ax][ay] = BLACK;
if (D > 0) {
ay = ay + yi;
D = D + (2 * (dy - dx));
} else D = D + 2 * dy;
}
}
public void plotLineHigh(int x0, int y0, int x1, int y1){
int dx = x1 - x0;
int dy = y1 - y0;
int xi = 1;
if (dx < 0) {
xi = -1;
dx = -dx;
}
int D = (2 * dx) - dy;
int ax = x0;
for (int ay = y0; ay < y1; ++ay) {
pixelArray[ax][ay] = BLACK;
if (D > 0) {
ax = ax + xi;
D = D + (2 * (dx - dy));
} else D = D + 2 * dx;
}
}
public void plotLine(int x0, int y0, int x1, int y1) {
if (Math.abs(y1 - y0) < Math.abs(x1 - x0)) {
if (x0 > x1) {
plotLineLow(x1, y1, x0, y0);
} else {
plotLineLow(x0, y0, x1, y1);
}
} else {
if (y0 > y1) {
plotLineHigh(x1, y1, x0, y0);
} else {
plotLineHigh(x0, y0, x1, y1);
}
}
}
public void resetOld() {
oldx = -1;
oldy = -1;
}
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(Color.WHITE);
for (int i = 0; i < defaultWidth; ++i){
for (int j = 0; j < defaultHeight; ++j){
/*
since most of the image will be white and few pixels will be black,
we set the color to white and when we encounter a black pixel,
we temporarily change the color to black, paint the pixel and switch
it back to white.
*/
if (pixelArray[i][j] == BLACK){
g.setColor(Color.BLACK);
g.drawLine(i, j, i, j);
g.setColor(Color.WHITE);
} else if (pixelArray[i][j] == WHITE){
g.drawLine(i, j, i, j);
}
}
}
}
}