Program to generate 3D Object using Polygon Surfaces and then perform 3D transformation.

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>         

void trans();

//void axis();

void scale();

void rotate();

int maxx,maxy,midx,midy;

/*void axis()

{

//          getch();

  //        cleardevice();

            line(midx,0,midx,maxy);

            line(0,midy,maxx,midy);

}*/

void main()

{

            int ch;

            int gd=DETECT,gm;

            detectgraph(&gd,&gm);

            initgraph(&gd,&gm,"e:\\tc\\bgi");

            printf("\n 1.Translation \n2.Scaling\n 3.Rotation \n 4.exit");

            printf("enter your choice");

            scanf("%d",&ch);

            do

            {

                        switch(ch)

                        {

                                    case 1 :             trans();

                                                            getch();

                                                      //    closegraph();

                                                            break;

                                    case 2 :             scale();

                                                            getch();

                                                      //    closegraph();

                                                            break;

                                    case 3 :             rotate();

                                                            getch();

                                                    //      closegraph();

                                                            break;

                                    case 4 :        break;

                        }

                        printf("enter your choice");

                        scanf("%d",&ch);

            } while(ch<4);

}

void trans()

{

            int x,y,z,o,x1,x2,y1,y2;

            maxx=getmaxx();

            maxy=getmaxy();

            midx=maxx/2;

            midy=maxy/2;

            //axis();

            bar3d(midx+50,midy-100,midx+60,midy-90,10,1);

            printf("Enter translation factor");

            scanf("%d%d",&x,&y);

            printf("After translation:");

            bar3d(midx+x+50,midy-(y+100),midx+x+60,midy-(y+90),10,1);

}

void scale()

{

            int x,y,z,o,x1,x2,y1,y2;

            maxx=getmaxx();

            maxy=getmaxy();

            midx=maxx/2;

            midy=maxy/2;

            //axis();

            bar3d(midx+50,midy-100,midx+60,midy-90,5,1);

            printf("before translation\n");

            printf("Enter scaling factors\n");

            scanf("%d %d %d", &x,&y,&z);

            printf("After scaling\n");

            bar3d(midx+(x*50),midy-(y*100),midx+(x*60),midy-(y*90),5*z,1);

}

void rotate()

{

            int x,y,z,o,x1,x2,y1,y2;

            maxx=getmaxx();

            maxy=getmaxy();

            midx=maxx/2;

            midy=maxy/2;

            //axis();

            bar3d(midx+50,midy-100,midx+60,midy-90,5,1);

            printf("Enter rotating angle");

            scanf("%d",&o);

            x1=50*cos(o*3.14/180)-100*sin(o*3.14/180);

            y1=50*sin(o*3.14/180)+100*cos(o*3.14/180);

            x2=60*cos(o*3.14/180)-90*sin(o*3.14/180);

            y2=60*sin(o*3.14/180)+90*cos(o*3.14/180);

   //       axis();

    //      printf("After rotation about z axis");

    //      bar3d(midx+x1,midy-y1,midx+x2,midy-y2,5,1);

            //axis();

            printf("After rotation  about x axis");

            bar3d(midx+50,midy-x1,midx+60,midy-x2,5,1);

            //axis();

            printf("After rotation about yaxis");

            bar3d(midx+x1,midy-100,midx+x2,midy-90,5,1);

}