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发表于 2011-2-17 14:59:43
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显示全部楼层
回复【152楼】xmysz
帅，已经很专业了！
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import java.awt.*;
import java.applet.*;
public class HilbertCurve extends Applet {
private SimpleGraphics sg=null;
private int dist0=512, dist=dist0;
public void init( ) {
dist0 = 1024;
resize ( dist0, dist0 );
sg = new SimpleGraphics(getGraphics());
}
public void paint(Graphics g) {
int level = 8;
dist = dist0;
for (int i=level; i>0; i--) dist /= 2;
sg.goToXY ( dist/2, dist/2 );
HilbertU(level); // start recursion
}
// Make U-shaped curve at this scale:
private void HilbertU(int level) {
if (level > 0) {
HilbertD(level-1); sg.lineRel(0, dist);
HilbertU(level-1); sg.lineRel(dist, 0);
HilbertU(level-1); sg.lineRel(0, -dist);
HilbertC(level-1);
}
}
// Make D-shaped (really "]" shaped) curve at this scale:
private void HilbertD(int level) {
if (level > 0) {
HilbertU(level-1); sg.lineRel(dist, 0);
HilbertD(level-1); sg.lineRel(0, dist);
HilbertD(level-1); sg.lineRel(-dist, 0);
HilbertA(level-1);
}
}
// Make C-shaped (really "[" shaped) curve at this scale:
private void HilbertC(int level) {
if (level > 0) {
HilbertA(level-1); sg.lineRel(-dist, 0);
HilbertC(level-1); sg.lineRel(0, -dist);
HilbertC(level-1); sg.lineRel(dist, 0);
HilbertU(level-1);
}
}
// Make A-shaped (really "?" shaped) curve at this scale:
private void HilbertA(int level) {
if (level > 0) {
HilbertC(level-1); sg.lineRel(0, -dist);
HilbertA(level-1); sg.lineRel(-dist, 0);
HilbertA(level-1); sg.lineRel(0, dist);
HilbertD(level-1);
}
}
}
class SimpleGraphics {
private Graphics g = null;
private int x = 0, y = 0;
public SimpleGraphics(Graphics g) { this.g = g; }
public void goToXY(int x, int y) { this.x = x; this.y = y; }
public void lineRel(int deltaX, int deltaY) {
g.drawLine ( x, y, x+deltaX, y+deltaY );
x += deltaX; y += deltaY;
}
} |
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楼主: wxws
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