Wednesday, October 13, 2010

Draw the following figure(1)

Share Orkut

#include<stdio.h>
#include<graphics.h>
struct point
{
 int x,y;
}pol[3],polnew[3],circ,insid[12];
int n,r;
float trans[3][3],result[3][1],xandy[3][1];
void plot(int,int,int,int);
void boundaryfill4(int,int,int,int);
void midpoint(int xc,int yc,int r)
{
 int x=0;
 int y=r;
 int p=1-r;
 plot(xc,yc,x,y);
 while(x<y)
 {
  x++;
  if(p<0)
   p+=2*x+1;
  else
  {
   y--;   
   p+=2*(x-y)+1;
  }
  plot(xc,yc,x,y);
 }
}
void plot(int xc,int yc,int x,int y)
{
 putpixel(xc+x,yc+y,10);
 putpixel(xc-x,yc+y,10);
 putpixel(xc+x,yc-y,10);
 putpixel(xc-x,yc-y,10);
 putpixel(xc+y,yc+x,10);
 putpixel(xc-y,yc+x,10);
 putpixel(xc+y,yc-x,10);
 putpixel(xc-y,yc-x,10);
}
void drawpol()
{
 int i; 
 for(i=0;i<2;i++)
  line(pol[i].x,pol[i].y,pol[(i+1)].x,pol[(i+1)].y);
}
void drawnewpol()
{
 int i; 
 for(i=0;i<2;i++)
  line(polnew[i].x,polnew[i].y,polnew[(i+1)].x,polnew[(i+1)].y);
}
void mulmat()
{
 int i,j,k;
 for(i=0;i<3;i++)
 {
  for(j=0;j<1;j++)
  {
   result[i][j]=0.0;
   for(k=0;k<3;k++)
    result[i][j]+=trans[i][k]*xandy[k][j];
  }
 }
}
void transformpoint(int x,int y)
{
 xandy[0][0]=x;
 xandy[1][0]=y;
 xandy[2][0]=1;
 mulmat();
}
void transformpoly()
{
 int i; 
 for(i=0;i<3;i++)
 {
  xandy[0][0]=pol[i].x;
  xandy[1][0]=pol[i].y;
  xandy[2][0]=1;
  mulmat();
  polnew[i].x=result[0][0];
  polnew[i].y=result[1][0];
 }
}
void makeIdentity()
{
 int i,j;
 for(i=0;i<3;i++)
 {
  for(j=0;j<3;j++)
   trans[i][j]=0.0;
  trans[i][i]=1.0;
 }
}
void rotate(int rx,int ry,int an)
{
 float ang;
 ang=(float)(an*(3.14/180));
 trans[0][0]=cos(ang);
 trans[0][1]=-sin(ang);
 trans[0][2]=rx*(1-cos(ang))+ry*sin(ang);
 trans[1][0]=sin(ang);
 trans[1][1]=cos(ang);
 trans[1][2]=ry*(1-cos(ang))-rx*sin(ang);
 
}
void boundaryfill4(int x,int y,int new,int bdry)
{
 int current=getpixel(x,y);
 if((current!=bdry)&&(current!=new))
 {
  putpixel(x,y,new);
  boundaryfill4(x+1,y,new,bdry);
  boundaryfill4(x-1,y,new,bdry);
  boundaryfill4(x,y+1,new,bdry);
  boundaryfill4(x,y-1,new,bdry);
 }
}
int main()
{
 int i,j,angle=0,gd=DETECT,gm=VGAMAX,ch;
 int color[]={1,14,3,4,5,6,7,8,9,11,12,13};
 printf("Enter the orgin ");
 scanf("%d%d",&circ.x,&circ.y);
 printf("Enter the radius ");
 scanf("%d",&r);
 do{
  printf("\nMENU\n-------\n1.Enter inside points to fill\n
  2.Take the inside points automatically");
  printf("\nEnter ur choice  ");
  scanf("%d",&ch);
 }while(ch>2&&ch<1);
 if(ch==1)
 {
  printf("\nEnter the inside point of circle ");
  scanf("%d%d",&insid[0].x,&insid[0].y);
  for(i=1;i<12;i++)
  {
   printf("\nEnter the inside point %d ",i);
   scanf("%d%d",&insid[i].x,&insid[i].y);
  }
 }
 initgraph(&gd,&gm,"NULL");
 setcolor(10);
 midpoint(circ.x,circ.y,r);
 makeIdentity();
 j=360/11;
 pol[0].x=circ.x;
 pol[0].y=circ.y+r;
 pol[1].x=pol[0].x;
 pol[1].y=pol[0].y+50;
 rotate(circ.x,circ.y,j);
 transformpoint(pol[0].x,pol[0].y);
 pol[2].x=result[0][0];
 pol[2].y=result[1][0];
 rotate(circ.x,circ.y,360/22);
 transformpoint(pol[1].x,pol[1].y);
 pol[1].x=result[0][0];
 pol[1].y=result[1][0];
 if(ch==2)
 {
  insid[0].x=circ.x;
  insid[0].y=circ.y;
  insid[1].x=(pol[0].x+pol[1].x+pol[2].x)/3;
  insid[1].y=(pol[0].y+pol[1].y+pol[2].y)/3;
 }
 boundaryfill4(insid[0].x,insid[0].y,color[0],10);
 drawpol();
 boundaryfill4(insid[1].x,insid[1].y,color[1],10);
 for(i=0;i<10;i++)
 {
  angle+=j;
  rotate(circ.x,circ.y,angle);
  transformpoly();
  drawnewpol();
  if(ch==2)
  {
   insid[i+2].x=(polnew[0].x+polnew[1].x+polnew[2].x)/3;
   insid[i+2].y=(polnew[0].y+polnew[1].y+polnew[2].y)/3;
  }
  boundaryfill4(insid[i+2].x,insid[i+2].y,color[i+2],10);
 }
 while(!kbhit());
 closegraph();
 return 0;
}

Tuesday, October 12, 2010

Rotate a triangle along the circumference of a circle, also rotate the triangle with reference to its centroid

Share Orkut
Rotate a triangle along the circumference of a circle,  also rotate the triangle with reference to its centroid. 
Use midpoint algorithm for circle drawing.

Clip a polygon and fill the area.

Share Orkut

Tuesday, October 5, 2010

Bezier, Bspline, Cubic Spline Curves

Share Orkut

Monday, October 4, 2010

Animation of some real world objects(Wind Mill)

Share Orkut

Tuesday, September 28, 2010

Circumcircle of a polygon

Share Orkut

Monday, September 27, 2010

Bouncing Ball

Share Orkut