[LEFT]سلام دوستان این برنامه cohen خودم نوشتم که از شانسم نتونستم به استاد تحویل بدم براش سنگ تموم گذاشتم هتمن اجراش کنید مثل این گیرتون نمیاد
// Programer: Iman Mohammadi iman_ison@yahoo.com
#include<stdio.h>
#include<graphics.h>
#include<math.h>
#include<conio.h>
#include<stdlib.h>
#include<iostream.h>
#include<iomanip.h>
#include<dos.h>
//******************* Type Variables ***********************
enum{LEFT,RIGHT,BOTTOM,TOP};
char code1[]={0,0,0,0};
char code2[]={0,0,0,0};
int xmin,ymin,xmax,ymax;
double x1,y1,x2,y2;
//************************************************** ********
//******************* Declarations *************************
void graphic(void);
void convert(double,double,int&,int&);
void setline(void);
void display(void);
void encode(char*,double,double);
unsigned char accept(void);
unsigned char reject(void);
unsigned char pointinside();
void cohen_suterland(void);
//************************************************** ********
//*********************** MAIN *****************************
void main()
{
graphic();
display();
setline();
cohen_suterland();
getch();
}
//************************************************** *******************
//*********************** Graphic Detection ***************************
void graphic(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int x, y, color;
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "..\\bgi");
/* read result of initialization */
errorcode = graphresult();
/* an error occurred */
if (errorcode != grOk)
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
/* terminate with an error code */
exit(1);
}
}
//************************************************** *********************
///////////////////////////////////////////////////////////////////////////
//********************************************
void convert(double x,double y,int &xr,int &yr)
{
xr=50+(x*25);
yr=400-(y*25);
}
//*********************************************
void display(void)
{
setcolor(RED);
line(20,150,600,150);
line(20,250,600,250);
line(150,20,150,450);
line(300,20,300,450);
setcolor(WHITE);
char str[2];
line(50,50,50,400);
line(51,400,500,400);
for(int i=50;i<=375;i+=25)
{
itoa(15-((i/25)-1),str,10);
outtextxy(20,i,str);
line(47,i,53,i);
itoa((i/25)-1,str,10);
outtextxy(i+25,410,str);
line(i+25,397,i+25,403);
}
xmin=4; ymin=6;
xmax=10; ymax=10;
int xrmin,yrmin,xrmax,yrmax;
convert(xmin,ymin,xrmin,yrmin);
convert(xmax,ymax,xrmax,yrmax);
rectangle(xrmin,yrmin,xrmax,yrmax);
}
//********************************************
void setline(void)
{
int xr1,yr1,xr2,yr2;
outtextxy(10,10,"Enter points (X1,Y1,X2,Y2) :");
cin>>x1>>y1>>x2>>y2;
convert(x1,y1,xr1,yr1);
convert(x2,y2,xr2,yr2);
line(xr1,yr1,xr2,yr2);
}
//********************************************
void encode(char *code,double x,double y)
{
code[LEFT] = (x<xmin) ? 1 : 0;
code[RIGHT] = (x>xmax) ? 1 : 0;
code[BOTTOM]= (y<ymin) ? 1 : 0;
code[TOP] = (y>ymax) ? 1 : 0;
}
//********************************************
unsigned char accept(void)
{
for(int i=LEFT;i<=TOP;i++)
if (code1[i]|code2[i])
return 0;
return 1;
}
//********************************************
unsigned char reject(void)
{
for(int i=LEFT;i<=TOP;i++)
{
if (code1[i]&code2[i])
return 1;
}
getch();
return 0;
}
//********************************************
unsigned char pointinside()
{
for(int i=LEFT;i<=TOP;i++)
if (code1[i]==1)
return 0;
return 1;
}
//********************************************
void cohen_suterland(void)
{
double m;
int done=0 ,draw=0;
int xr1,yr1,xr2,yr2;
while(! done)
{
encode(code1,x1,y1);
encode(code2,x2,y2);
getch();
if(accept())
{done=1; draw=1;}
else
if(reject())
{done=1;}
else
{
if (pointinside())
{
double tem;
tem=x1;
x1=x2;
x2=tem;
tem=y1;
y1=y2;
y2=tem;
for (int i=LEFT;i<=TOP;i++)
{
tem=code1[i];
code1[i]=code2[i];
code2[i]=tem;
}
}
m=(y2-y1)/(x2-x1);
if (code1)
{
y1+=(xmin-x1)*m;
x1=xmin;
convert(x1,y1,xr1,yr1);
circle(xr1,yr1,5);
}
else
if (code1[RIGHT])
{
y1+=(xmax-x1)*m;
x1=xmax;
setcolor(YELLOW);
convert(x1,y1,xr1,yr1);
circle(xr1,yr1,5);
}
else
if (code1[BOTTOM])
{
x1+=(ymin-y1)/m;
y1=ymin;
convert(x1,y1,xr1,yr1);
circle(xr1,yr1,5);
}
else
if( code1[TOP])
{
x1+=(ymax-y1)/m;
y1=ymax;
convert(x1,y1,xr1,yr1);
circle(xr1,yr1,5);
}
}
}
if (draw)
setcolor(GREEN);
else
setcolor(RED);
convert(x1,y1,xr1,yr1);
convert(x2,y2,xr2,yr2);
line(xr1,yr1,xr2,yr2);
getch();
}
//********************************************
