1. Rotation And Scalling By: Asima Latif

2. SCALING #include<iostream.h> #include<conio.h> #include<graphics.h> #include<dos.h> void main() { int gd=DETECT,gm,x[10],y[10],a,b,i,j,dx,dy; clrscr();

3. SCALING… initgraph(&gd,&gm,"c:\\tc\\bgi"); cout<<" To draw polygon enter the number of sides for polygon\t"; cin>>j; cout<<"\n Now enter co-ordinates for each point\n\t"; for(i=0;i<j;i++) cin>>x[i]>>y[i]; a=x[0]; b=y[0]; setcolor(BLUE); for(i=1;i<=j-1;i++) { line(x[i],y[i],x[i+1],y[i+1]); }

4. SCALING… line(x[i],y[i],a,b); cout<<"\n Enter the co-ordinates for scaling \t"; cin>>dx>>dy; cout<<"\n After scaling"; for(i=1;i<=j-1;i++) { line(x[i]*dx, y[i]*dy, x[i+1]*dx, y[i+1]*dy); } line(x[i]*dx, y[i]*dy, a*dx, b*dy); getch(); closegraph(); }

5. ROTATION • #include<iostream.h> • #include<conio.h> • #include<graphics.h> • #include<dos.h> • #include<math.h> • void main() • { • int gd=DETECT,gm,x[10],y[10],a,b,i,j,dx,dy,var1,var2,ang; • float d; • clrscr();

6. ROTATION… • initgraph(&gd,&gm,"c:\\tc\\bgi"); • cout<<" To draw polygon enter the number of sides for polygon\t"; • cin>>j; • cout<<"\n Now enter co-ordinates for each point\n\t"; • for(i=0;i<j;i++) • cin>>x[i]>>y[i]; • a=x[0]; b=y[0]; • setcolor(BLUE); • for(i=0;i<j-1;i++) • { • line(x[i],y[i],x[i+1],y[i+1]); • delay(500); • }

7. ROTATION… • line(x[i],y[i],a,b); • setcolor(RED); • cout<<"\n Enter the angle for rotation \t"; • cin>>ang; • cout<<"\n After rotation"; • d=(3.14*ang)/180 • var1=x[0]*cos(d)-y[0]*sin(d)-x[0]; • var2=x[0]*sin(d)+y[0]*cos(d)-y[0];

8. ROTATION… for(i=0;i<j-1;i++) { line( x[i]*cos(d)-y[i]*sin(d)-var1, x[i]*sin(d)+y[i]*cos(d)-var2, x[i+1]*cos(d)-y[i+1]*sin(d)-var1, x[i+1]*sin(d)+y[i+1]*cos(d)-var2 ); delay(500); } line( x[i]*cos(d)-y[i]*sin(d)-var1, x[i]*sin(d)+y[i]*cos(d)-var2, x[0]*cos(d)-y[0]*sin(d)-var1, x[0]*sin(d)+y[0]*cos(d)-var2 ); getch(); closegraph(); }

9. Eid Mubarik in Advance!