计算机图形学-边缘填充算法-java实现

import javax.swing.JFrame;

public class EdgeFill {

public static void main(String args[]) {
// A(3,3)B(6,20)C(15,18)D(20,3)
// AB BD AC CD
new EdgeFill();
}

private TwoDimen env;

public EdgeFill() {
JFrame frame = new JFrame();
env = new TwoDimen();
frame.getContentPane().add(env);
frame.setBounds(100, 100, 600, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setVisible(true);
int[] x = new int[] { 3, 6, 20, 15 };
int[] y = new int[] { 3, 20, 3, 18 };
for (int i = 0; i < x.length; i++) {
if (i < x.length - 1)
edgeFillOnce(x[i], y[i], x[i + 1], y[i + 1]);
else
edgeFillOnce(x[i], y[i], x[0], y[0]);
}
}

private void edgeFillOnce(int x1, int y1, int x2, int y2) {
int k, i, j;
float x, y, dx, dy;
k = Math.abs(x2 - x1);
if (Math.abs(y2 - y1) > k) {
k = Math.abs(y2 - y1);
}
dx = (float) (x2 - x1) / k;
dy = (float) (y2 - y1) / k;
x = (float) x1;
y = (float) y1;
for (i = 0; i < k+1; i++) {
// env.drawPoint((int)(x+0.5), (int)(y+0.5));
for (j = (int) (x + 0.5); j < env.getMaxX(); j++) {
if (!env.isFilled(j, (int) (y + 0.5)))
env.drawPoint(j, (int) (y + 0.5));
else
env.cleanPoint(j, (int) (y + 0.5));
}
x = x + dx;
y = y + dy;
}
}
}