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我有一些呈現立方體的代碼，並在按下箭頭鍵時將其旋轉。填充四邊形
現在我試圖填充立方體的一面，起初工作得很好。
但是當我觀察到它後，我注意到，如果我以某個角度旋轉立方體，那麼應該填充的表面的行爲非常奇怪。
代碼：
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
public class Cube extends JFrame {
double p[][] = new double[9][4];
int x=1, y=2, z=3;
boolean xRotUp = false;
boolean yRotRight = false;
boolean xRotDown = false;
boolean yRotLeft = false;
double px, py, pz;
double angle_x = 0.02;
double angle_y = 0.0150;
double angle_z = 0.010;
public Cube() {
setSize(500,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
switch (e.getKeyCode()) {
case 37:
yRotLeft = false;
break;
case 38:
xRotUp = false;
break;
case 39:
yRotRight = false;
break;
case 40:
xRotDown = false;
break;
}
}
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case 37:
if (!yRotRight) {
yRotLeft = true;
} else {
yRotRight = false;
}
break;
case 38:
if (!xRotDown) {
xRotUp = true;
} else {
xRotDown = false;
}
break;
case 39:
if (!yRotLeft) {
yRotRight = true;
} else {
yRotLeft = false;
}
break;
case 40:
if (!xRotUp) {
xRotDown = true;
} else {
xRotUp = false;
}
break;
}
}
});
}
public void rotate() {
for (int i=0; i<9;i++) {
px = p[i][x];
py = p[i][y];
pz = p[i][z];
if (xRotUp) {
p[i][y] = py*Math.cos(angle_x)-pz*Math.sin(angle_x);
p[i][z] = py*Math.sin(angle_x)+pz*Math.cos(angle_x);
py = p[i][y];
pz = p[i][z];
}
if (xRotDown) {
p[i][y] = py*Math.cos(-angle_x)-pz*Math.sin(-angle_x);
p[i][z] = py*Math.sin(-angle_x)+pz*Math.cos(-angle_x);
py = p[i][y];
pz = p[i][z];
}
if (yRotRight) {
p[i][x] = px*Math.cos(angle_y)+pz*Math.sin(angle_y);
p[i][z] =-px*Math.sin(angle_y)+pz*Math.cos(angle_y);
px = p[i][x];
}
if (yRotLeft) {
p[i][x] = px*Math.cos(-angle_y)+pz*Math.sin(-angle_y);
p[i][z] =-px*Math.sin(-angle_y)+pz*Math.cos(-angle_y);
px = p[i][x];
}
}
}
public void init() {
setBackground(new Color(0,0,0));
p[1][x] = -100; p[1][y] = -100; p[1][z] = -100;
p[2][x] = +100; p[2][y] = -100; p[2][z] = -100;
p[3][x] = +100; p[3][y] = -100; p[3][z] = +100;
p[4][x] = -100; p[4][y] = -100; p[4][z] = +100;
p[5][x] = -100; p[5][y] = +100; p[5][z] = -100;
p[6][x] = +100; p[6][y] = +100; p[6][z] = -100;
p[7][x] = +100; p[7][y] = +100; p[7][z] = +100;
p[8][x] = -100; p[8][y] = +100; p[8][z] = +100;
/* 8 - - - - - 7
/| /|
5 - - - - - 6 |
| | | |
| 4 - - - -|- 3
|/ |/
1 - - - - - 2
*/
}
Image buffer;
Graphics2D gBuffer;
public void paint(Graphics g) {
if (buffer==null) {
buffer=createImage(this.getSize().width, this.getSize().height);
gBuffer=(Graphics2D)buffer.getGraphics();
}
gBuffer.clearRect(0,0,this.getSize().width, this.getSize().height);
gBuffer.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
gBuffer.setColor(Color.LIGHT_GRAY);
gBuffer.drawLine((int)(p[4][x])+200,(int)(p[4][y])+200,(int)(p[6][x])+200,(int)(p[6][y])+200);
gBuffer.drawLine((int)(p[2][x])+200,(int)(p[2][y])+200,(int)(p[8][x])+200,(int)(p[8][y])+200);
gBuffer.drawLine((int)(p[1][x])+200,(int)(p[1][y])+200,(int)(p[7][x])+200,(int)(p[7][y])+200);
gBuffer.drawLine((int)(p[5][x])+200,(int)(p[5][y])+200,(int)(p[3][x])+200,(int)(p[3][y])+200);
gBuffer.setColor(Color.DARK_GRAY);
gBuffer.fillPolygon(new int[] {
(int)p[1][x]+200,
(int)p[2][x]+200,
(int)p[6][x]+200,
(int)p[5][x]+200},
new int[] {
(int)p[1][y]+200,
(int)p[2][y]+200,
(int)p[5][y]+200,
(int)p[6][y]+200
} , 4);
gBuffer.setColor(Color.CYAN);
gBuffer.drawLine((int)(p[1][x])+200,(int)(p[1][y])+200,(int)(p[2][x])+200,(int)(p[2][y])+200);
gBuffer.drawLine((int)(p[2][x])+200,(int)(p[2][y])+200,(int)(p[3][x])+200,(int)(p[3][y])+200);
gBuffer.drawLine((int)(p[3][x])+200,(int)(p[3][y])+200,(int)(p[4][x])+200,(int)(p[4][y])+200);
gBuffer.drawLine((int)(p[4][x])+200,(int)(p[4][y])+200,(int)(p[1][x])+200,(int)(p[1][y])+200);
gBuffer.drawLine((int)(p[5][x])+200,(int)(p[5][y])+200,(int)(p[6][x])+200,(int)(p[6][y])+200);
gBuffer.drawLine((int)(p[6][x])+200,(int)(p[6][y])+200,(int)(p[7][x])+200,(int)(p[7][y])+200);
gBuffer.setColor(Color.RED);
gBuffer.drawLine((int)(p[7][x])+200,(int)(p[7][y])+200,(int)(p[8][x])+200,(int)(p[8][y])+200);
gBuffer.setColor(Color.CYAN);
gBuffer.drawLine((int)(p[8][x])+200,(int)(p[8][y])+200,(int)(p[5][x])+200,(int)(p[5][y])+200);
gBuffer.drawLine((int)(p[1][x])+200,(int)(p[1][y])+200,(int)(p[5][x])+200,(int)(p[5][y])+200);
gBuffer.drawLine((int)(p[2][x])+200,(int)(p[2][y])+200,(int)(p[6][x])+200,(int)(p[6][y])+200);
gBuffer.drawLine((int)(p[3][x])+200,(int)(p[3][y])+200,(int)(p[7][x])+200,(int)(p[7][y])+200);
gBuffer.setColor(Color.BLUE);
gBuffer.drawLine((int)(p[4][x])+200,(int)(p[4][y])+200,(int)(p[8][x])+200,(int)(p[8][y])+200);
g.drawImage (buffer, 0, 0, this);
try {Thread.sleep(20);}
catch (InterruptedException e) {}
//for (int i=1;i<9;i++) {
// Rotation um z-Achse
//p[i][x] = px*Math.cos(angle_z)-py*Math.sin(angle_z);
//p[i][y] = py*Math.cos(angle_z)+px*Math.sin(angle_z);
// }
rotate();
repaint();
}
public void update(Graphics g) {paint(g);}
}
你能對你的意思是「行爲怪異」的詳細說明什麼？你期望它看起來像什麼，它實際上是什麼樣子？有很多代碼，更多的細節將幫助人們縮小可能的錯誤。 – paisanco
是的那些多邊形伸出來 - 你想讓我們做你的幾何？ – gpasch
@paisanco像_gpasch_已經說過一個多邊形是突出的。有時它也會旋轉並創建多個三角形 – Clyme