DDA Line Drawing Algorithm

DDA Line Drawing Algorithm implementation on MFC,

Code:

void DrawByDDA(HDC hdc,int xs,int ys,int xe,int ye,COLORREF color)
{
int dx=xe-xs;
int dy=ye-ys;
SetPixel(hdc,xs,ys,color);
if(abs(dx)>=abs(dy))
{
int x=xs,xinc= dx>0?1:-1;
double y=ys,yinc=(double)dy/dx*xinc;
while(x!=xe)
{
x+=xinc;
y+=yinc;
SetPixel(hdc,x,round(y),color);
}
}
 
else
{
int y=ys,yinc= dy>0?1:-1;
double x=xs,xinc=(double)dx/dy*yinc;
while(y!=ye)
{
x+=xinc;
y+=yinc;
SetPixel(hdc,round(x),y,color);
}
}
} 

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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