WINDOWING TO VIEWPORT 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 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
 |
 |
 |
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COHEN-SUTHERLAND 2D LINE CLIPPING
#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
float
cxl,cxr,cyt,cyb;
code(float
,float);
void
clip(float ,float,float,float);
void rect(float ,float,float,float);
main()
{
float
x1,y1,x2,y2;
int g=0,d;
initgraph(&g,&d,"c:\\tc\\bin");
settextstyle(1,0,1);
outtextxy(40,15,"BEFORE
CLIPPING");
printf("\n
Please Enter Left,Bottom,Right,Top Of Clip Window");
scanf("%f%f%f%f",&cxl,&cyb,&cxr,&cyt);
rect(cxl,cyb,cxr,cyt);
getch();
printf("\n Enter
The Line Coordinate");
scanf("%f%f%f%f",&x1,&y1,&x2,&y2);
line(x1,y1,x2,y2);
getch();
cleardevice();
settextstyle(1,0,1);
outtextxy(40,15,"AFTER
CLIPPING");
clip(x1,y1,x2,y2);
getch();
closegraph();
}
void
clip(float x1,float y1,float x2,float y2)
{
int c,c1,c2;
float x,y;
c1=code(x1,y1);
c2=code(x2,y2);
getch();
while((c1!=0)||(c2!=0))
{
if((c1&c2)!=0)
goto out;
c=c1;
if(c==0)
c=c2;
if((c&1)==1)
{
y=y1+(y2-y1)*(cxl-x1);
x=cxl;
}
else
if((c&2)==2)
{
y=y1+(y2-y1)*(cxl-x1)/(x2-x1);
x=cxr;
}
else
if((c&8)==8)
{
x=x1+(x2-x1)*(cyb-y1)/(y2-y1);
y=cyb;
}
else
if((c&4)==4)
{
x=x1+(x2-x1)*(cyt-y1)/(y2-y1);
y=cyt;
}
if(c==c1)
{
x1=x;
y1=y;
c1=code(x,y);
}
else
{
x2=x;
y2=y;
c2=code(x,y);
}
}
out:
rect(cxl,cyb,cxr,cyt);
line(x1,y1,x2,y2);
}
code(float
x ,float y)
{
int c=0;
if(x<cxl) c=1;
else
if(x>cxr) c=2;
else
if(y<cyb) c=c|8;
else
if(y>cyt) c=c|4;
return c;
}
void
rect(float xl,float yb,float xr,float yt)
{
line(xl,yb,xr,yb);
line(xr,yb,xr,yt);
line(xr,yt,xl,yt);
line(xl,yt,xl,yb);
}
OUTPUT
BEFORE
CLIPPING
Please
Enter Left , Bottom , Right , Top Of The Clip window
200
200
400
400
Please
Enter The Line Coordinates (X1, Y1, X2, Y2)
150
300
400
450
 |
AFTER
CLIPPING
 |
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