WINDOWING TO VIEWPORT MAPPING

WINDOWING TO VIEWPORT MAPPING

Aim :

To write a C program to clip a Window to Viewport Mapping.

Algorithm:

Step 1: Start the program.

Step 2: get the maximum and minimum co-ordinates of the Window

Step 3: get the maximum and minimum co-ordinates of the ViewPort

Step 4: get the co-ordinates of a point by fitting window in viewport.

Step 5: Display the output.

Step 6: Stop theprorgam.

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