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2D Scaling 


#include<stdio.h>
#include <stdlib.h>
#include<graphics.h>
#include<conio.h>
#include<math.h>
void draw2d(int,int [],int [],int,int);
void main()
{
int gd=DETECT,gm;
int x[20],y[20],tx=0,ty=0,i,fs;
int mx,my;
initgraph(&gd,&gm,"");
printf("No of sides : ");
scanf("%d",&fs);
printf("Co-ordinates : ");
for(i=0;i<fs;i++)
{
printf("(x%d,y%d)",i,i);
scanf("%d%d",&x[i],&y[i]);
}
draw2d(fs,x,y,tx,ty);
printf("magnification (x,y) : ");
scanf("%d%d",&mx,&my);
for(i=0;i<fs;i++)
{
x[i]=x[i]*mx;
y[i]=y[i]*my;
}
draw2d(fs,x,y,tx,ty);
getch();
}
void draw2d(int fs,int x[20],int y[20],int tx,int ty)
{
int i;
for(i=0;i<fs;i++)
{
if(i!=(fs-1))
line(x[i]+tx,y[i]+ty,x[i+1]+tx,y[i+1]+ty);
else
line(x[i]+tx,y[i]+ty,x[0]+tx,y[0]+ty);
}
}
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