Thick Line Program Using Bresenham Algorithm In C Graphics

 Thick Line Program 

#include<stdio.h>

#include<graphics.h>

#include<math.h>

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

void main()

{

    int gdriver=DETECT, gmode;

    int thickness;

    initgraph(&gdriver, &gmode, "C:\\Turboc3\\bgi");

    printf("\nEnter the thickness of line: ");

    scanf("%d", &thickness);

    if(thickness<=1)

printf("Invalid Size...");

    else

    {

bresenham(300, 0, 300, 100, thickness);

bresenham(300, 0, 350, 40, thickness);

bresenham(350, 50, 300, 70, thickness);

bresenham(300, 100, 200, 200, thickness);

bresenham(300, 100, 400, 200, thickness);

bresenham(200, 200, 200, 350, thickness);

bresenham(200, 200, 400, 200, thickness);

bresenham(400, 200, 400, 350, thickness);

bresenham(200, 350, 400, 350, thickness);

bresenham(225, 225, 225, 260, thickness);

bresenham(225, 225, 260, 225, thickness);

bresenham(225, 260, 260, 260, thickness);

bresenham(260, 225, 260, 260, thickness);

bresenham(340, 225, 375, 225, thickness);

bresenham(340, 225, 340, 260, thickness);

bresenham(340, 260, 375, 260, thickness);

bresenham(375, 225, 375, 260, thickness);

bresenham(275, 285, 275, 350, thickness);

bresenham(275, 285, 315, 285, thickness);

bresenham(315, 285, 315, 350, thickness);

    }

    getch();

}

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

{

int dx, dy, p, xend, yend, twody, twodydx, x, y, twodx, twodxdy, wy, wx=0, i;

float m, slop, po1=0, po2=0, sq=0;

dx=abs(xa-xb);

dy=abs(ya-yb);

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

po1=pow((xb-xa),2);

po2=pow((yb-ya),2);

sq=sqrt(po1+po2);

if(m<1)

wy=((thickness-1)*sq)/(2*fabs(xb-xa));

else

wx=((thickness-1)*sq)/(2*fabs(yb-ya));

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;

}

while(x<xend)

{

if(wx==0)

for(i=y+wy;i>y-wy;i--)

putpixel(x, i, 2);

else

for(i=x+wx;i>x-wx;i--)

putpixel(i, y, 2);

x++;

if(p<0)

{

p=p+twody;

}

else

{

if(m>0 && m<1)

{

y++;

}

else

{

y--;

p=p+twodydx;

}

}

}

}

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;

}

while(y<yend)

{

if(wx==0)

for(i=y+wy;i>y-wy;i--)

putpixel(x, i, 2);

else

for(i=x+wx;i>x-wx;i--)

putpixel(i, y, 2);

y++;

if(p<0)

{

p=p+twodx;

}

else

{

if(m>=1)

{

x++;

}

else

{

x--;

p=p+twodxdy;

}

}

}

}

}

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