Write a Program to implement scaling transformation?

Answer 1

//write a program to scale a rectangle at given point(h,k) #include<graphics.h> #include<stdio.h> #include<conio.h> #include<math.h> int round(float); void main() { int driver,mode,x1,y1,x2,y2,x3,y3,x4,y4,theeta,h,k,a,b; float x_dash1,y_dash1,x_dash2,y_dash2,x_dash3,y_dash3,x_dash4,y_dash4; char str[10]; clrscr(); printf("ENTER THE UPPER LEFT CORNER OF THE RECTANGLE : (X1,Y1)"); scanf("%d%d",&x1,&y1); printf("ENTER THE UPPER RIGHT CORNER OF THE RECTANGLE : (X2,Y2)"); scanf("%d%d",&x2,&y2); printf("ENTER THE LOWER RIGHT CORNER OF THE RECTANGLE : (X3,Y3)"); scanf("%d%d",&x3,&y3); printf("ENTER THE LOWER LEFT CORNER OF THE RECTANGLE : (X4,Y4)"); scanf("%d%d",&x4,&y4); driver=DETECT; initgraph(&driver,&mode,"c:\\tc\\bgi"); line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x4,y4); line(x4,y4,x1,y1); sprintf(str,"(%d,%d)",x1,y1); outtextxy(x1-75,y1-10,str); sprintf(str,"(%d,%d)",x2,y2); outtextxy(x2+10,y2-10,str); sprintf(str,"(%d,%d)",x3,y3); outtextxy(x3+10,y3+10,str); sprintf(str,"(%d,%d)",x4,y4); outtextxy(x4-75,y4+10,str); getch(); closegraph(); printf("ENTER POINTS OF SCALING \n"); printf("ENTER POINTS FOR X-AXIS :"); scanf("%d",&h); printf("ENTER POINTS FOR Y-AXIS : "); scanf("%d",&k); printf("ENTER SIZE OF SCALING(i.e '2' for twice and '3' for thrice)\n"); printf("ENTER THE VALUE TO BE SCALED FOR x-axis : "); scanf("%d",&a); printf("ENTER THE VALUE TO BE SCALED FOR y-axis : "); scanf("%d",&b); if(a<4 & b<4) { x_dash1=x1*a-h*a+h; y_dash1=y1*b-k*b+k; x_dash2=x2*a-h*a+h; y_dash2=y2*b-k*b+k; x_dash3=x3*a-h*a+h; y_dash3=y3*b-k*b+k; x_dash4=x4*a-h*a+h; y_dash4=y4*b-k*b+k; initgraph(&driver,&mode,"c:\\tc\\bgi"); cleardevice(); line(x1,y1,x2,y2); line(x2,y2,x3,y3); line(x3,y3,x4,y4); line(x4,y4,x1,y1); setcolor(GREEN); line(x_dash1,y_dash1,x_dash2,y_dash2); line(x_dash2,y_dash2,x_dash3,y_dash3); line(x_dash3,y_dash3,x_dash4,y_dash4); line(x_dash4,y_dash4,x_dash1,y_dash1); sprintf(str,"(%d,%d)",round(x_dash1),round(y_dash1)); outtextxy(round(x_dash1),round(y_dash1),str); sprintf(str,"(%d,%d)",round(x_dash2),round(y_dash2)); outtextxy(round(x_dash2),round(y_dash2),str); sprintf(str,"(%d,%d)",round(x_dash3),round(y_dash3)); outtextxy(round(x_dash3),round(y_dash3),str); sprintf(str,"(%d,%d)",round(x_dash4),round(y_dash4)); outtextxy(round(x_dash4),round(y_dash4),str); getch(); closegraph(); } else printf("YOU HAVE ENTERED WRONG SCALLING VALUES"); getch(); } int round(float x) { int x1=x; float x2=x-x1; if(x2>0.5) x1++; return x1; }