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DDA Line Drawing Algorithm Using C Programming


#include<stdio.h>
#include<math.h>
#include<conio.h>
#include<graphics.h>
#define round(val) (int)(val+0.5)
void main()
{
int gd=DETECT,gm;
void line_dda(int,int,int,int);
int xa,xb,ya,yb;
printf("Enter the two values");
scanf("%d%d%d%d",&xa,&ya,&xb,&yb);  initgraph(&gd,&gm,"");
cleardevice();
line_dda(xa,ya,xb,yb);
getch();
closegraph();
}

void line_dda(int xa,int ya,int xb,int yb)
{
int Dx=xb-xa,Dy=yb-ya,steps,k;
float xin,yin,X=xa,Y=ya;
if(abs(Dx)>abs(Dy))
    steps=abs(Dx);
else
    steps=abs(Dy);

xin=Dx/(float)steps;
yin=Dy/(float)steps;
putpixel(round(X),round(Y),6);

for(k=0;k<steps;k++)
{
X=X+xin;
Y=Y+yin;
putpixel(round(X),round(Y),6);
}
}

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