WINDOW – VIEW PORT MAPPING algorithm Source code C Language Programming

Window view port mapping is draw by the graphics function using rectangle and line function. There rectangle and line has four argument there are declare as the Float data variable.
Source code Window-View Port Mapping
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
main()
{
float sx,sy;
int w1,w2,w3,w4,x1,x2,x3,x4,y1,y2,y3,y4,v1,v2,v3,v4;
int gd=DETECT,gm;
initgraph(&gd,&gm,"C:/tc/bgi");
printf("Enter the Co-ordinates x1,y1,x2,y2,x3,y3\n");
scanf("%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3);
cleardevice();
w1=5;
w2=5;
w3=635;
w4=465;
rectangle(w1,w2,w3,w4);
line(x1,y1,x2,y2);
line(x2,y2,x3,y3);
getch();
v1=425;
v2=75;
v3=550;
v4=250;
sx=(float)(v3-v1)/(w3-w1);
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 of the window View Port
CS1355-Graphics and Multimedia Lab