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Datei: Cube.java Sprache: JAVA

package HyperCube;
//-------------------------------------------------------------------------
//           Point4D
//-------------------------------------------------------------------------
class Point extends Object {
  int x;
  int y;

  Point(int x, int y) {
    this.x=x;
    this.y=y;}

  Point(Point P) {
    this.x=P.x;
    this.y=P.y;}

  Point() {
    this.x=0;
    this.y=0;}}
//-------------------------------------------------------------------------
//           Point4D
//-------------------------------------------------------------------------
class Point4D extends Point {
   int z;
   int t;
   Point4D(int x, int y, int z, int t) {
     this.x=x;
     this.y=y;
     this.z=z;
     this.t=t;}

   Point4D(Point4D P) {
     this.x=P.x;
     this.y=P.y;
     this.z=P.z;
     this.t=P.t;}

   Point4D() {
     this.x=0;
     this.y=0;
     this.z=0;
     this.t=0;}}

//-------------------------------------------------------------------------
//           Point3D
//-------------------------------------------------------------------------
public class Cube {
   final int    dim=16*8;
   final double PI=Math.PI;
   final int    base=28; // title height
   Point        DisplayWidth=new Point(0,0);
   int          SideLength=0;
   double       anglexy = PI / 3;
   double       angleyz = PI / 3;
   double       anglezt = PI / 3;
   double       angletx = PI / 3;
   double       anglety = PI / 3;
   Point        center=new Point(0,0); // center of pane
   Point4D      transform=new Point4D();  //set center of cube to origin
   Point4D      from[]=null;
   Point4D      to[]=null;
   Point        fromp[]=null;
   Point        top[]=null;
   int          count=0;

//-------------------------------------------------------------------------
//        constructior Point3D
//-------------------------------------------------------------------------
public Cube(int w, int h) {
  count=0;
  from  = new Point4D[dim];
  to    = new Point4D[dim];
  fromp = new Point[dim];
  top   = new Point[dim];
  DisplayWidth.x=w;
  DisplayWidth.y=h;
  center.x = w / 2;
  center.y = base+(h-base) / 2;
  SideLength=Math.min(2*center.x/3,2*center.y/3);
  transform.x=SideLength / 2;
  transform.y=SideLength / 2;
  transform.z=SideLength / 2;
  transform.t=SideLength / 2;}
//-------------------------------------------------------------------------
//           add Point4D
//-------------------------------------------------------------------------
public void add(Point4D f, Point4D t) {
   Point mean=new Point(0,0);
   count++;
   if (count > dim) System.out.println("Exception at cube, count ="+count);
   else {
     from[count]=new Point4D(f);
     to[count]=new Point4D(t);
     Point4D PA = new Point4D(f.x * SideLength-transform.x, f.y * SideLength-transform.y,
                              f.z * SideLength-transform.z, f.t * SideLength-transform.t);
     Point4D PE = new Point4D(t.x * SideLength-transform.x, t.y * SideLength-transform.y,
                              t.z * SideLength-transform.z, t.t * SideLength-transform.t);
     PA = rotatexy(PA);
     PE = rotatexy(PE);
     PA = rotateyz(PA);
     PE = rotateyz(PE);
     PA = rotatetx(PA);
     PE = rotatetx(PE);
     PA = rotatety(PA);
     PE = rotatety(PE);
     fromp[count]=new Point(PA);
     top[count]=new Point(PE);
     if (Math.abs(fromp[count].x)>mean.x) mean.x=Math.abs(fromp[count].x);
     if (Math.abs(fromp[count].y)>mean.y) mean.y=Math.abs(fromp[count].y);
     if (Math.abs(top[count].x)>mean.x) mean.x=Math.abs(top[count].x);
     if (Math.abs(top[count].y)>mean.y) mean.y=Math.abs(top[count].y);}}
   //-------------------------------------------------------------------------
   //            rotate xy
   //-------------------------------------------------------------------------
    public Point4D rotatexy(Point4D P) {
        double cosa = Math.cos(anglexy);
        double sina = Math.sin(anglexy);
        Point4D res = new Point4D();
        res.x = (int) (float) (cosa * P.x - sina * P.y);
        res.y = (int) (float) (sina * P.x + cosa * P.y);
        res.z = P.z;
        res.t = P.t;
        return res;}
    //-------------------------------------------------------------------------
    //            rotate yz
    //-------------------------------------------------------------------------
    public Point4D rotateyz(Point4D P) {
        double cosa = Math.cos(angleyz);
        double sina = Math.sin(angleyz);
        Point4D res = new Point4D();
        res.x = P.x;
        res.y = (int) (float) (cosa * P.y - sina * P.z);
        res.z = (int) (float) (sina * P.y + cosa * P.z);
        res.t = P.t;
        return res; }
    //-------------------------------------------------------------------------
    //            rotate tx
    //-------------------------------------------------------------------------
    public Point4D rotatetx(Point4D P) {
        double cosa = Math.cos(angletx);
        double sina = Math.sin(angletx);
        Point4D res = new Point4D();
        res.y = P.y;
        res.z = P.z;
        res.t = (int) (float) (cosa * P.t - sina * P.x);
        res.x = (int) (float) (sina * P.t + cosa * P.x);
        return res;}
    //-------------------------------------------------------------------------
    //            rotate ty
    //-------------------------------------------------------------------------
    public Point4D rotatety(Point4D P) {
        double cosa = Math.cos(anglety);
        double sina = Math.sin(anglety);
        Point4D res = new Point4D();
        res.x = P.x;
        res.z = P.z;
        res.t = (int) (float) (cosa * P.t - sina * P.y);
        res.y = (int) (float) (sina * P.t + cosa * P.y);
        return res;}}

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