C Program of Polygon Relative In Computer Graphics


Program of Polygon Relative


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#include<stdio.h>

#include<conio.h>

#include<math.h>

#include<graphics.h>

#include<string.h>

#define size 25

#define r(a) (a+0.5)


int gdriver=DETECT, gmode;

float df_penx, df_peny, frame_penx, frame_peny, df_op[size], df_x[size], df_y[size];

float hs, he, h, we, ws, w, x, y;

int op,fre,erase_flag=0, x1, y1, n;

float a_x[]={0.4, 0.23, -0.23, 0.5, -0.23, 0.23};

float a_y[]={0.3, 0.2, 0.2, 0.0, -0.2, -0.2};


void erase()

{

int j;

for(n=1;n<we+1;n++)

for(j=1;j<he+1;j++)

putpixel(n, j, 0);

}


void new_frame()

{

erase_flag=1;

}


void initialize()

{

fre=0;

df_penx=0;

df_peny=0;

frame_penx=0;

frame_peny=0;

hs=0;

he=getmaxy();

h=he-hs;

ws=0;

we=getmaxy();

w=we-ws;

}


void putpoint(int op, float x, float y)

{

df_x[fre]=x;

df_y[fre]=y;

if(df_x[fre]==0 || df_y[fre]==0)

        {

            df_x[fre]=x;

    df_y[fre]=y;

        }

df_op[fre]=op;

fre++;

}


void display_file(int op)

{

putpoint(op, df_penx, df_peny);


void line_rel(float x, float y)

{

df_penx+=x;

df_peny+=y;

display_file(2);

}


void line_abs(float dx, float dy)

{

df_penx=dx;

df_peny=dy;

display_file(2);

}


void move_abs(float a_x[], float a_y[], int j)

{

float tempx, tempy;

if(j<3)

printf("It not ploygone...");

else

{

df_penx+=a_x[0];

df_peny+=a_y[0];

tempx=df_penx;

tempy=df_peny;

display_file(j);

for(n=1;n<j;n++)

{

line_rel(a_x[n], a_y[n]);

}

line_abs(tempx, tempy);

}

}


float max(float a, float b)

{

if(a>b)

return (a);

else

return (b);

}


float min(float a, float b)

{

if(a<b)

return (a);

else

return (b);

}


void bresenham(int xa, int ya, int xb, int yb);


void domove(float x, float y)

{

float p1, q1;

p1=min(we, (x*w+ws));

q1=min(he, (y*h+hs));

frame_penx=max(ws, p1);

frame_peny=max(hs, q1);

}


void doline(float x, float y){

float p1, q1;

p1=min(we, (x*w+ws));

q1=min(he, (y*h+hs));

x1=frame_penx;

y1=frame_peny;

frame_penx=max(ws, p1);

frame_peny=max(hs, q1);

bresenham(r(x1), r(y1), r(frame_penx), r(frame_peny));

}


void dopol(float x, float y)

{

domove(x, y);

}


void getpoint(int n)

{

op=df_op[n];

x=df_x[n];

y=df_y[n];

}


void interpret(int s, int count)

{

for(n=s;n<=count;n++)

{

getpoint(n);

if(op==1)

domove(x, y);

else if(op==2)

doline(x, y);

else

dopol(x, y);

}

}


void make_pic()

{

if(erase_flag==1)

{

erase();

erase_flag=0;

}

if(fre>1)

interpret(0, fre-1);

fre=0;

}


void main()

{

clrscr();

initgraph(&gdriver, &gmode, "C:\\TurboC3\\BGI");

initialize();

new_frame();

move_abs(a_x, a_y, 6);

make_pic();

getch();

}


void bresenham(int xa, int ya, int xb, int yb)

{

int p, x, y, dx, dy, twodydx, twody, twodxdy, twodx, xend, yend;

float m;

dx=abs(xa-xb);

dy=abs(ya-yb);

m=(float)(yb-ya)/(xb-xa);


if(dx>dy)

{

p=2*dy-dx;

twody=2*dy;

twodydx=2*(dy-dx);

if(xa>xb)

{

x=xb;

y=yb;

xend=xa;

}

else

{

x=xa;

y=ya;

xend=xb;

}


putpixel(x, y, 3);


while(x<xend)

{

x++;

if(p<0)

p=p+twody;

else

{

if(0<m && m<1)

y++;

else

y--;

p=p+twodydx;

}

putpixel(x, y, 3);

}

}

else

{

p=2*dx-dy;

twodx=2*dx;

twodxdy=2*(dx-dy);

if(ya>yb)

{

x=xb;

y=yb;

yend=ya;

}

else

{

x=xa;

y=ya;

yend=yb;

}


putpixel(x, y, 3);


while(y<yend)

{

y++;

if(p<0)

p=p+twodx;

else

{

if(m>=1)

x++;

else

x--;

p=p+twodxdy;

}

putpixel(x, y, 3);

}

}

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