tuxing2.c

计算机图形学课程设计报告内有源代码和TC运行环境

  putpixel(x0-y0+y,y0-x0+x,color);     /*(y,  x) */
  putpixel(x0+y0-y,y0-x0+x,color);     /*(-y, x) */
  putpixel(2*x0-x,y,color);            /*(-x, y) */
  putpixel(x0-y0+y,y0+x0-x,color);     /*(y, -x) */
  putpixel(x,2*y0-y,color);            /*(x, -y) */
  putpixel(2*x0-x,2*y0-y,color);       /*(-x,-y) */
  putpixel(x0+y0-y,y0+x0-x,color);     /*(-y,-x) */
}


/* 算法 1：圆的中点算法 */
void MidPointCircle_1(Point Q,int radius,int color)/* 圆心为 Q */
{
  int x,y,x0,y0;
  float d;

  x0 = Q.x;
  y0 = Q.y;

  x = x0;
  y = y0+radius;
  d = 5.0/4.0 - radius;
  CirclePoints(x0,y0,x,y,color);
  while((y-y0)>(x-x0))
  {
    if(d<=0)
      d = d + 2.0*(x-x0) + 3;
    else
      {
        d = d + 2.0*((x-x0)-(y-y0)) + 5;
        y--;
      }
    x++;
    CirclePoints(x0,y0,x,y,color);
  }

}

/* 算法 2 ：消除了浮点运算的中点算法 */

void MidPointCircle_2(Point Q,int radius,int color)/* 圆心为（x0,y0);*/
{
  int x,y,d,x0,y0;

  x0 = Q.x;
  y0 = Q.y;

  x = x0;
  y = y0 + radius;
  d = 5 - 4*radius;
  CirclePoints(x0,y0,x,y,color);
  while((y-y0)>(x-x0))
  {
   if(d<=0)
      d = d + 8*(x-x0) + 12;
    else
      {
        d = d + 8*((x-x0)-(y-y0)) + 20;
        y--;
      }
    x++;
    CirclePoints(x0,y0,x,y,color);
  }
}

/* 算法 3 ：消除了乘法运算的中点算法 */
void MidPointCircle_3(Point Q,int radius,int color)/* 圆心为（x0,y0);*/
{
   int x,y,d,deltaE,deltaSE,x0,y0;

   x0 = Q.x;
   y0 = Q.y;

   x = x0;
   y = y0 + radius;
   d = 5 - 4*radius;
   deltaE = 12;
   deltaSE = 20 - 8*radius;
   CirclePoints(x0,y0,x,y,color);
   while((y-y0)>(x-x0))
   {
      if(d<=0)
      {
        d = d + deltaE;
        deltaSE=deltaSE + 8;
      }
      else
      {
         d = d + deltaSE;
         deltaSE=deltaSE + 16;
         y--;
      }
      deltaE=deltaE + 8;
      x++;
      CirclePoints(x0,y0,x,y,color);
   }

}



/***********************/
/*   椭圆的中点算法    */
/***********************/


/* 椭圆的4对称点的显示 */
void EllipsePoints(int x0,int y0,int x,int y,int color) /*椭圆的中心为:(x0,y0)*/
{
  putpixel(x,y,color);              /*(x,  y) */
  putpixel(2*x0-x,y,color);         /*(-x, y) */
  putpixel(2*x0-x,2*y0-y,color);    /*(-x,-y) */
  putpixel(x,2*y0-y,color);         /*(x, -y) */
}


/* 椭圆的中点算法 */
void MidPointEllipse(Point Q,int a,int b,int color)
{
  int x,y,xP,yP,x0,y0;
  float d,squrarea,squrareb;
   x0 = Q.x;
   y0 = Q.y;


  squrarea = a * a;
  squrareb = b * b;

  /*计算分解点P*/
  xP = (int)(0.5 + squrarea/sqrt(squrarea + squrareb));
  yP = (int)(0.5 + squrareb/sqrt(squrarea + squrareb));

 /* 生成上半部椭圆*/
  x = x0;
  y = y0 + b;
  d = 4 * (squrareb - squrarea * b) + squrarea;
  EllipsePoints(x0,y0,x,y,color);
  while((x - x0)<xP)
  {
    if(d<=0)
       d = d + 4 * squrareb * (2 * (x - x0) + 3);
    else
       {
         d = d + 4 * squrareb * (2 * (x - x0) + 3)-8 * squrarea * ((y - y0) - 1);
         y--;
       }
    x++;
    EllipsePoints(x0,y0,x,y,color);
  }

  /* 生成下半部椭圆*/
  x = x0 + a;
  y = y0;
  d = 4 * (squrarea - squrareb * a) + squrareb;
  EllipsePoints(x0,y0,x,y,color);
  while((y-y0) < yP)
  {
    if(d<=0)
       d = d + 4 * squrarea * (2 * (y - y0) + 3);
    else
       {
         d = d + 4 * squrarea * (2 * (y - y0) + 3)-8 * squrareb * ((x - x0) - 1);
         x--;
       }
     y++;
   EllipsePoints(x0,y0,x,y,color);
  }
}


/***********************/
/*     矩形的算法      */
/***********************/
void Rectangle(Point LeftTop,Point RightDown,int color)
{
  int x1,y1,x2,y2,x,y;
  x1 = LeftTop.x;
  x2 = RightDown.x;
  y1 = LeftTop.y;
  y2 = RightDown.y;
  x = x1;
  while(x<=x2)
  {
    putpixel(x,y1,color);
    putpixel(x,y2,color);
    x++;
  }

  y = y1;
  while(y<=y2)
  {
     putpixel(x1,y,color);
     putpixel(x2,y,color);
     y++;
  }

}


/*************************/
/******   网格球     *****/
/*************************/

void QiuEC(Point o,int r,int color) /*  球心为(x,y) */
{
  float i,X,Y,ra,rb;
  int k,x,y;
  x = o.x;
  y = o.y;
  MidPointEllipse(o,r,15,color);
  MidPointCircle_1(o,r,color);
  for(i=1;i<=(r/5);i++)
  {

     MidPointEllipse(o,5*i,r,color);

  }
  k = (int)(r/4);
  for(i=1;i<4;i++)
  {
     o.y = y-(4-i)*k;
     MidPointEllipse(o,sqrt(2*r*(k*i)-k*i*k*i),i*4,color);
     o.y = y+(4-i)*k;
     MidPointEllipse(o,sqrt(2*r*(k*i)-k*i*k*i),i*4,color);
  }
}

/***************************/
/**　　　　　　　　　　　 **/
/**      正方体的算法     **/
/**                       **/
/***************************/
void Zft3D(Point3D A,int r,float q,float qx,float qy,float qz) /* 观察方向为(qx,qy,qz)*/
{
   int x,y,z,X,Y,Z,i,j,k;
   Point3D B1,B2,B3,B4,B5,B6,B7,B8;
   Point3D C1,C2,C3,C4;
   Point A1,A2,A3,A4,A5,A6,A7,A8;
   float Q;
   Q = (3.1415926/180)*q;


   x = A.x;
   y = A.y;
   z = A.z;

   C1.x = x + 3 * r; C1.y = y - 3 * r; C1.z = z + 2 * r;
   C2.x = x + 3 * r; C2.y = y + 3 * r; C2.z = z + 2 * r;
   C3.x = x - 3 * r; C3.y = y + 3 * r; C3.z = z + 2 * r;
   C4.x = x - 3 * r; C4.y = y - 3 * r; C4.z = z + 2 * r;

   X = C1.x; Y = C1.y; Z = C1.z;
   i = C1.x;  j = C1.y;
   while(j<=C2.y)       /* 白色底面*/
   {
      while(i>=C4.x)
      {

        Point3D_2D(&X,&Y,&Z,qx,qy,qz);
        putpixel(X,Y,15);
        i--;
        X = i; Y = j; Z = C1.z;
      }
      j++;
      X = C1.x; Y = j; Z = C1.z; i = X;
   }

   C1.x = x + r/2.0; C1.y = y - r/2.0 + tan(Q)*(5.0/2.0)*r; C1.z = z + 1.5 * r;
   C2.x = x + r/2.0; C2.y = y + r/2.0 + tan(Q)*(5.0/2.0)*r; C2.z = z + 1.5 * r;
   C3.x = x - r/2.0; C3.y = y + r/2.0 + tan(Q)*(5.0/2.0)*r; C3.z = z + 1.5 * r;
   C4.x = x - r/2.0; C4.y = y - r/2.0 + tan(Q)*(5.0/2.0)*r; C4.z = z + 1.5 * r;

   X = C1.x; Y = C1.y; Z = C1.z;
   i = C1.x;  j = C1.y;
   while(j<=C2.y)        /* 阴影*/
   {
      while(i>=C4.x)
      {

        Point3D_2D(&X,&Y,&Z,qx,qy,qz);
        putpixel(X,Y,8);
        i--;
        X = i; Y = j; Z = C1.z;
      }
      j++;
      X = C1.x; Y = j; Z = C1.z; i = X;
   }



   B1.x = x + r/2.0; B1.y = y - r/2.0; B1.z = z - r/2.0;
   B2.x = x + r/2.0; B2.y = y + r/2.0; B2.z = z - r/2.0;
   B3.x = x - r/2.0; B3.y = y + r/2.0; B3.z = z - r/2.0;
   B4.x = x - r/2.0; B4.y = y - r/2.0; B4.z = z - r/2.0;


   B5.x = x + r/2.0; B5.y = y - r/2.0; B5.z = z + r/2.0;
   B6.x = x + r/2.0; B6.y = y + r/2.0; B6.z = z + r/2.0;
   B7.x = x - r/2.0; B7.y = y + r/2.0; B7.z = z + r/2.0;
   B8.x = x - r/2.0; B8.y = y - r/2.0; B8.z = z + r/2.0;



   X = B1.x; Y = B1.y; Z = B1.z;

   i = X; j = Y;

   while(j <= B2.y)
   {
      while(i >= B4.x)
     {
      Point3D_2D(&X,&Y,&Z,qx,qy,qz);
          putpixel(X,Y,15);
      i--;
      X = i; Y = j; Z = B1.z;
      }
      j++;
      X = B1.x; Y = j; Z = B1.z;i = X;
    }


    X = B1.x; Y = B1.y; Z = B1.z;
    i = X; k = Z;
    while(i>=B4.x)
    {
       while(k <= B5.z)
       {
          Point3D_2D(&X,&Y,&Z,qx,qy,qz);
          putpixel(X,Y,7);
          k++;
          X = i;Y = B1.y;Z = k;
       }
       i--;
       X = i; Y = B1.y;Z = B1.z;k = Z;
    }

     X = B1.x; Y = B1.y; Z = B1.z;
     j = Y;  k = Z;
    while(j <= B2.y)
    {
       while(k<=B5.z)
       {
          Point3D_2D(&X,&Y,&Z,qx,qy,qz);
          putpixel(X,Y,8);
          k++;
          X = B1.x;Y = j;Z = k;
       }
       j++;
       X = B1.x; Y = j;Z = B1.z; k = Z;
    }

}

/*****************************/
/**                         **/
/**     四棱锥的画法        **/
/**                         **/
/*****************************/
void Slz3D(Point3D A,int h,int r,float qx,float qy,float qz)
{
   int x,y,z,X,Y,Z,i,j,k;
   Point3D A1,A2,A3,A4,P;
   Point B1,B2,B3,B4,Q,temp;


   x = A.x; y = A.y; z = A.z;

   A1.x = x + r/2.0; A1.y = y - r/2.0; A1.z = A.z;
   A2.x = x + r/2.0; A2.y = y + r/2.0; A2.z = A.z;
   A3.x = x - r/2.0; A3.y = y + r/2.0; A3.z = A.z;
   A4.x = x - r/2.0; A4.y = y - r/2.0; A4.z = A.z;

   P.x = A.x; P.y = A.y; P.z = A.z - h;



   X = P.x; Y = P.y; Z = P.z;
      Point3D_2D(&X,&Y,&Z,qx,qy,qz);
   Q.x = X; Q.y = Y;

   X = A4.x; Y = A4.y; Z = A4.z;
   j = A4.y;
   while(j<=A3.y)
   {
      Point3D_2D(&X,&Y,&Z,qx,qy,qz);
      temp.x = X; temp.y = Y;
        MidPointLine(Q,temp,14);
        LineDDA(temp,Q,14);
      j++;
      X = A4.x; Y = j;Z = A4.z;
   }

   X = A3.x; Y = A3.y; Z = A3.z;
   i = A3.x;
   while(i<=A2.x)
   {
      Point3D_2D(&X,&Y,&Z,qx,qy,qz);
      temp.x = X; temp.y = Y;
        MidPointLine(Q,temp,9);
        LineDDA(temp,Q,9);
      i++;
      X = i; Y = A3.y;Z = A3.z;
   }



   X = A1.x; Y = A1.y; Z = A1.z;
   j = A1.y;
   while(j<=A2.y)
   {
      Point3D_2D(&X,&Y,&Z,qx,qy,qz);
      temp.x = X; temp.y = Y;
         MidPointLine(Q,temp,6);
         LineDDA(temp,Q,6);
      j++;
      X = A1.x; Y = j;Z = A1.z;

   }

   X = A1.x; Y = A1.y; Z = A1.z;
   i = A1.x;
   while(i>=A4.x)
   {
      Point3D_2D(&X,&Y,&Z,qx,qy,qz);
      temp.x = X; temp.y = Y;
        MidPointLine(Q,temp,12);
        LineDDA(temp,Q,12);
      i--;
      X = i; Y = A1.y; Z = A1.z;

   }


}

/*****************************/
/**                         **/
/**     三棱柱的画法        **/
/**                         **/
/*****************************/
void SLZU3D(Point3D A,int h,int r,float qx,float qy,float qz)
{



}


/*****************************/
/**                         **/
/**     矩形的旋转          **/
/**                         **/
/*****************************/
void Rectangle_XuanZhuan(Rect R,float q)
{
  int x1,y1,x2,y2,x,y,color,X,Y;

  color = R.color;

  x1 = R.LeftTop.x;
  y1 = R.LeftTop.y;

  x2 = R.RightDown.x;
  y2 = R.RightDown.y;

  x = x1;
  while(x<=x2)
  {
    X = x;
    Y = y1;
    XuanZhuan(&X,&Y,q);
       putpixel(X,Y,color);

    X = x;
    Y = y2;
    XuanZhuan(&X,&Y,q);
       putpixel(X,Y,color);

    x++;
  }

  y = y1;
  while(y<=y2)
  {
     X = x1;
     Y = y;
     XuanZhuan(&X,&Y,q);
       putpixel(X,Y,color);

     X = x2;
     Y = y;
     XuanZhuan(&X,&Y,q);
       putpixel(X,Y,color);
     y++;
  }

}




/******************************/
/*                            */
/*       椭圆的平移           */
/*                            */
/******************************/

/*平移后椭圆的4对称点的显示*/
void EllipsePoints_PinYi(int x0,int y0,int x,int y,int color,int tx,int ty) /*椭圆的中心为:(x0,y0)*/
{
  int X,Y;
  X = x;
  Y = y;
  PinYi(&X,&Y,tx,ty);
     putpixel(X,Y,color);      /*(x,  y)*/

  X = 2*x0-x;
  Y = y;
  PinYi(&X,&Y,tx,ty);
     putpixel(X,Y,color);      /*(-x, y)*/

  X = 2*x0-x;
  Y = 2*y0-y;
  PinYi(&X,&Y,tx,ty);
     putpixel(X,Y,color);      /*(-x,-y)*/

  X = x;
  Y = 2*y0-y;
  PinYi(&X,&Y,tx,ty);
     putpixel(X,Y,color);       /*(x, -y)*/
}

/* 椭圆的平移*/

void MidPointEllipse_PinYi(TuoYuan E,int tx,int ty)
{
  int x,y,xP,yP,x0,y0,a,b,color;
  float d,squrarea,squrareb;

   a = E.a;
   b = E.b;
   color = E.color;
   x0 = E.o.x;
   y0 = E.o.y;


  squrarea = a * a;
  squrareb = b * b;