I want create a 3d cube,wich you can rotate with w,a,s and d.
But when the cube rotate disappearing some cube faces.
See http://greenfootgallery.org/scenarios/3417
Thanks for your help.
Advenging
public class ZeichenBlatt extends Actor
{
int P2[][] = {{1,1,-1},{-1,1,-1},{-1,-1,-1},{1,-1,-1}};
int[] dx = new int[4];
int[] dy = new int[4];
int P3[][] = {{1,1,1},{-1,1,1},{-1,-1,1},{1,-1,1}};
int[] dx2 = new int[4];
int[] dy2 = new int[4];
int P4[][] = {{1,1,-1},{1,1,1},{-1,1,1},{-1,1,-1}};
int[] dx3 = new int[4];
int[] dy3 = new int[4];
int P5[][] = {{1,1,-1},{1,1,1},{1,-1,1},{1,-1,-1}};
int[] dx4 = new int[4];
int[] dy4 = new int[4];
int P6[][] = {{1,-1,-1},{1,-1,1},{-1,-1,1},{-1,-1,-1}};
int[] dx5 = new int[4];
int[] dy5 = new int[4];
int P7[][] = {{1,-1,-1},{1,1,-1},{1,1,1},{1,-1,1}};
int[] dx6 = new int[4];
int[] dy6 = new int[4];
double e = 100;
int alpha = 0;
int beta = 0;
double a;
double b;
double Mx = 320;
double My = 240;
public ZeichenBlatt() {
GreenfootImage img = new GreenfootImage(640,480);
setImage(img);
img.setColor(Color.BLACK);
img.fill();
}
public void act() {
GreenfootImage img = getImage();
img.clear();
// Mx=Mx+0.2;
img.setColor(Color.BLACK);
img.fill();
if (Greenfoot.isKeyDown("q") )
{
e=e+0.2;
}
if (Greenfoot.isKeyDown("e") )
{
e=e-0.2;
}
if (Greenfoot.isKeyDown("a") )
{
beta=beta+1;
}
if (Greenfoot.isKeyDown("d") )
{
beta=beta-1;
}
if (Greenfoot.isKeyDown("w") )
{
alpha=alpha+1;
}
if (Greenfoot.isKeyDown("s") )
{
alpha=alpha-1;
}
if (Greenfoot.isKeyDown("left") )
{
Mx=Mx-2;
}
if (Greenfoot.isKeyDown("right") )
{
Mx=Mx+2;
}
if (Greenfoot.isKeyDown("up") )
{
My=My-2;
}
if (Greenfoot.isKeyDown("down") )
{
My=My+2;
}
for(int i2=0; i2<4; i2++) {
dx[i2] = toPx(P2[i2], alpha, beta);
dy[i2] = toPy(P2[i2], alpha, beta);
}
for(int i3=0; i3<4; i3++) {
dx2[i3] = toPx(P3[i3], alpha, beta);
dy2[i3] = toPy(P3[i3], alpha, beta);
}
for(int i4=0; i4<4; i4++) {
dx3[i4] = toPx(P4[i4], alpha, beta);
dy3[i4] = toPy(P4[i4], alpha, beta);
}
for(int i5=0; i5<4; i5++) {
dx4[i5] = toPx(P5[i5], alpha, beta);
dy4[i5] = toPy(P5[i5], alpha, beta);
}
for(int i6=0; i6<4; i6++) {
dx5[i6] = toPx(P6[i6], alpha, beta);
dy5[i6] = toPy(P6[i6], alpha, beta);
}
for(int i7=0; i7<4; i7++) {
dx6[i7] = toPx(P7[i7], alpha, beta);
dy6[i7] = toPy(P7[i7], alpha, beta);
}
img.setColor(Color.WHITE);
img.fillPolygon(dx,dy,4);
img.setColor(Color.YELLOW);
img.fillPolygon(dx2,dy2,4);
img.setColor(Color.RED);
img.fillPolygon(dx3,dy3,4);
img.setColor(Color.GREEN);
img.fillPolygon(dx4,dy4,4);
img.setColor(Color.ORANGE);
img.fillPolygon(dx5,dy5,4);
img.setColor(Color.BLUE);
img.fillPolygon(dx6,dy6,4);
}
public int toPx(int A[], int alpha, int beta) {
double a = Math.toRadians(alpha);
double b = Math.toRadians(beta);
double x = Mx+e*A[1]*Math.cos(b)-e*A[0]*Math.sin(b);// MX verschiebt würfel um x achse 1. Produkt gibt würfel seine form
return (int)Math.round(x);
}
public int toPy(int A[], int alpha, int beta) {
double a = Math.toRadians(alpha);
double b = Math.toRadians(beta);
double y = My-e*A[2]*Math.cos(a)+e*A[0]*Math.sin(a)*Math.cos(b)+e*A[1]*Math.sin(a)*Math.sin(b);
return (int)Math.round(y);
}
}
