Implementation of Window Viewport Mapping [CS1255 - Graphics and Multimedia Lab]

AIM:
                To write a "C++" program for the implementation of Window Viewport Mapping in CS1255 - Graphics and Multimedia Lab.

SOURCE CODE:

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
int main()
{
float sx,sy;
int w1,w2,w3,w4,v1,v2,v3,v4;
int x1,x2,x3,x4,y1,y2,y3,y4;
int gd=DETECT,gm;
initgraph(&gd,&gm,"c:\\tc\\bgi");
printf("Enter the coordinates x1,y1,x2,y2,x3,y3:\n");
scanf("%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3);
cleardevice();
w1=40;
w2=40;
w3=635;
w4=465;
rectangle(w1,w2,w3,w4);
line(x1,y1,x2,y2);
line(x2,y2,x3,y3);
line(x3,y3,x1,y1);
getch();
v1=425;
v2=75;
v3=550;
v4=250;
sx=(float)(v3-v1)/(w3-w2);
sy=(float)(v4-v2)/(w4-w2);
rectangle(v1,v2,v3,v4);
x1=v1+floor(((float)(x1-w1)*sx)+0.5);
x2=v1+floor(((float)(x2-w1)*sx)+0.5);
x3=v1+floor(((float)(x3-w1)*sx)+0.5);
y1=v2+floor(((float)(y1-w2)*sy)+0.5);
y2=v2+floor(((float)(y2-w2)*sy)+0.5);
y3=v2+floor(((float)(y3-w2)*sy)+0.5);
line(x1,y1,x2,y2);
line(x2,y2,x3,y3);
line(x3,y3,x1,y1);
getch();
return 0;
}

OUTPUT:

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