C++ Program to Implement DDA Line Drawing Algorithm

#include
#include
#include
#include
#include
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;

/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, “C:\\tc\\bgi”);

cout<<"\n Enter X1,Y1,X2,Y2"; int x1,y1,x2,y2; cin>>x1>>y1>>x2>>y2;

int dx=x2-x1;
int dy=y2-y1;
int length;
if (dx>=dy)
length=dx;
else
length=dy;
dx=dx/length;
dy=dy/length;
int sx;
if (dx>=0)
sx=1;
else
sx=-1;
int sy;
if(dy>=0)
sy=1;
else
sy=-1;
float x=x1+0.5*(sx);
float y=y1+0.5*(sy);
int i=0;
while(i<=length) { putpixel(int(x),int(y),15); x=x+dx; y=y+dy; i=i+1; } /* clean up */ getch(); closegraph(); return 0; } [/cpp] Output:

DDA
DDA

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