WINDOW TO VIEWPORT MAPPING

EX NO: 9                WINDOW TO VIEWPORT MAPPING

AIM:

To write a C program to perform Window to Viewport transformation.

Algorithm

Step1: Draw a world coordinate area selected for display called as window. This window defines what is to be viewed.

Step 2: Draw an area on a display device to which a window is mapped called as Viewport. The viewport defines where it is to be displayed.

Step 3: Now perform the mapping of a part of a world-coordinate scene to device coordinates referred as viewing transformation.

PROGRAM

#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 Coordinate 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);

line(x3,y3,x1,y1);

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)+.5);

x2=v1+floor(((float)(x2-w1)*sx)+.5);

x3=v1+floor(((float)(x3-w1)*sx)+.5);

y1=v2+floor(((float)(y1-w2)*sy)+.5);

y2=v2+floor(((float)(y2-w2)*sy)+.5);

y3=v2+floor(((float)(y3-w2)*sy)+.5);

line(x1,y1,x2,y2);

line(x2,y2,x3,y3);

line(x3,y3,x1,y1);

getch();

return 0;

}

OUTPUT

Enter The Coordinate x1,y1,x2,y2,x3,y3

100

200

300

400

500

350

RESULT:

 Thus the program is executed successfully.