February 1. Lab Manual INSTITUTE OF INFORMATION TECHNOLOGY & MANAGEMENT GWALIOR COMPUTER GRAPHICS & MUTIMEDIA

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1 Lab Manual February COMPUTER GRAPHICS & MUTIMEDIA INSTITUTE OF INFORMATION TECHNOLOGY & MANAGEMENT GWALIOR

2 SOFTWARE REQUIREMENT : 1. Turbo C++ IDE (TurboC3) 2. Borland Turbo C++ (Version 4.5)

3 LIST OF PROGRAMS 1. Write A Program To Draw A Pixel? 2. Write A Program To Draw A Line Using Line Function? 3. Write A Program To Draw A Line Using Dda Algorithm.? 4. Write A Program To Draw A Line Using Bresenham s Algorithm? 5. Write A Program For Bresenham s Circle Algorithm? 6. Write A Program For Mid Point Circle Algorithm? 7. Write A Program To Translate A Triangle? 8. Write A Program To Scaling A Triangle? 9. Write A Program To Show Reflection Of A Triangle? 10. Write A Program To Rotate A Triangle.?

4 Q.1 WRITE A PROGRAM TO DRAW A PIXEL? #include<conio.h> #include<iostream.h> #include<graphics.h> clrscr(); int gdriver=detect,gmode,x,y; int x,y; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); cout<<"enter the value of x and y"; cin>>x>>y; putpixel(x,y,4);

5 Q.2 WRITE A PROGRAM TO DRAW A LINE USING LINE FUNCTION? #include<conio.h> #include<iostream.h> #include<graphics.h> clrscr(); int gdriver=detect,gmode,x,y; int x1,y1,x2,y2; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); setcolor(-3); cout<<"enter the value of x and y"; cin>>x1>>y1>>x2>>y2; line(x1,y1,x2,y2);

6 Q.3WRITE A PROGRAM TO DRAW A LINE USING DDA ALGORITHM. # include<conio.h> # include<stdio.h> # include<graphics.h> # include<math.h> clrscr(); int gdriver=detect,gmode; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); int xa,ya,xb,yb; printf("enter the values of coordinate"); scanf("%d%d%d%d",&xa,&ya,&xb,&yb); int dx=xb-xa,dy=yb-ya,steps; float xinc,yinc,x=xa,y=ya; if (abs(dx)>abs(dy)) steps=abs(dx); else steps=abs(dy); xinc=dx/(float)steps ; yinc=dy/(float)steps; putpixel(x,y,-1); for(int k=0;k<=steps;k++) x=x+xinc;

7 y=y+yinc; putpixel(x,y,4);

8 Q.4 WRITE A PROGRAM TO DRAW A LINE USING BRESENHAM S ALGORITHM. # include <stdio.h> # include <conio.h> # include <graphics.h> int dx,dy,x,y,p,x1,y1,x2,y2; int gd,gm; clrscr(); printf("\n\n\tenter the co-ordinates of first point : "); scanf("%d %d",&x1,&y1); printf("\n\n\tenter the co-ordinates of second point : "); scanf("%d %d",&x2,&y2); dx = (x2 - x1); dy = (y2 - y1); p = 2 * (dy) - (dx); x = x1; y = y1; detectgraph(&gd,&gm); initgraph(&gd,&gm,"c:\\tc\\bgi"); putpixel(x,y,white); while(x <= x2) if(p < 0) x=x+1; y=y; p = p + 2 * (dy); else x=x+1; y=y+1; p = p + 2 * (dy - dx); putpixel(x,y,white);

9 closegraph();

10 Q.5 WRITE A PROGRAM FOR BRESENHAM S CIRCLE ALGORITHM. #include<iostream.h> #include<conio.h> #include<graphics.h> #include<math.h> int gdriver=detect,gmode; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); clrscr(); int h,k,r,x,y; cout<<"enter the coordinates of circle"; cin>>h>>k; cout<<"enter the radius"; cin>>r; int p=3-(2*r); x=0; y=r; while(x<y) putpixel(x+h,y+k,10); putpixel(-x+h,y+k,10); putpixel(-x+h,-y+k,10); putpixel(x+h,-y+k,10);

11 putpixel(y+k,x+h,10); putpixel(-y+k,x+h,10); putpixel(-y+k,-x+h,10); putpixel(y+k,-x+h,10); if(p<0) p=p+(4+x)+6; x=x+1; y=y; else p=p+(4*(x-y))+10; x=x+1; y=y-1;

12 Q.6 WRITE A PROGRAM FOR MID POINT CIRCLE ALGORITHM? #include<iostream.h> #include<conio.h> #include<graphics.h> clrscr(); int gdriver=detect,gmode,x=0,y,r,h,k,p; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); cout<<"enter the values of h and k"; cin>>h>>k; cout<<"enter the radius"; cin>>r; y=r; p=(5/4-r); while(x<y) putpixel(x+h,y+k,10); putpixel(-x+h,y+k,10); putpixel(-x+h,-y+k,10); putpixel(+x+h,-y+k,10); putpixel(y+k,x+h,10); putpixel(-y+k,x+h,10); putpixel(-y+k,-x+h,10); putpixel(+y+k,-x+h,10); if(p<0) p=p+(2*x)+1;

13 x=x++; y=y; else p=p+(2*x)-(2*y)+1; x=x++; y=y--;

14 Q.7 WRITE A PROGRAM TO TRANSLATE A TRIANGLE? #include<iostream.h> #include<conio.h> #include<graphics.h> clrscr(); int gdriver=detect,gmode,x1,y1,x2,y2,x3,y3,tx,ty; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); cout<<"enter the vertices\t"<<"enter the translation value"; cin>>x1>>y1>>x2>>y2>>x3>>y3; line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x1,y1); cin>>tx>>ty; line(x1+tx,y1+ty,x2+tx,y2+ty); line(x2+tx,y2+ty,x3+tx,y3+ty); line(x3+tx,y3+ty,x1+tx,y1+ty);

15 Q.8 WRITE A PROGRAM TO SCALING A TRIANGLE? #include<iostream.h> #include<conio.h> #include<graphics.h> clrscr(); int gdriver=detect,gmode,x1,y1,x2,y2,x3,y3,a,b,c,d,e,f,sx,sy; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); cout<<"enter the vertices of triangle"<<"enter the value of sx and sy"; cin>>x1>>y1>>x2>>y2>>x3>>y3; line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x1,y1); cin>>sx>>sy; a=x1*sx; b=y1*sy; c=x2*sx; d=y2*sy; e=x3*sx; f=y3*sy; line(a,b,c,d); line(c,d,e,f); line(e,f,a,b);

16 Q 9. WRITE A PROGRAM TO SHOW REFLECTION OF A TRIANGLE? #include<iostream.h> #include<conio.h> #include<graphics.h> #include<math.h> clrscr(); int gdriver=detect,gmode,x1,y1,x2,y2,x3,y3; char a; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); cout<<"enter the co-ordinate of triangle";//<<"enter the value of sx and sy"; cin>>x1>>y1>>x2>>y2>>x3>>y3; line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x1,y1); line(320,0,320,430); line(0,240,640,240); cout<<"enter the axis of reflection"; cin>>a; if(a=='x' a=='x') x1=x1; x2=x2; x3=x3; y1=y1+240; y2=y2+240; y3=y3+240; else if(a=='y' a=='y')

17 y1=y1; y1=y1; y3=y3; x1=x1+320; x2=x2+320; x3=x3+320; cout<<"triangle after reflection"; line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x1,y1);

18 Q.10 WRITE A PROGRAM TO ROTATE A TRIANGLE. #include<iostream.h> #include<conio.h> #include<graphics.h> #include<math.h> int gdriver=detect,gmode,x1,y1,x2,y2,x3,y3; int a,b,c,d,e,f,g; float p,q; initgraph(&gdriver,&gmode,"c:\\tc\\bgi"); clrscr(); cout<<"enter the vertices"; cin>>x1>>y1>>x2>>y2>>x3>>y3; line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x1,y1); cout<<"enter the rotation angle "; cin>>a; p=cos((a*3.14)/180); cout<<p<<endl; b=((x1,p)-(y1*q)); c=((x1*q)+(y1*p)); d=((x2*p)-(y2*q)); e=((y2*q)+(y2*p));

19 f=((x3*p)-(y3*p)); g=((y3*q)+(y3*p)); line(b,c,d,e); line(d,e,f,g); line(f,g,b,c);

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