直線DDA演算法的C語言實現

注:輸入線段起點和終點的x,y座標,程式將產生直線, 每產生10個點暫停顯示一下當前x,y座標位置.
	#include<graphics.h> void main() { int driver,mode; int xa,ya,xb,yb,c; int dx,dy,steps,k; float fx,fy,x,y; int wx,wy; driver=DETECT; mode=0; initgraph(&driver,&mode,""); printf("please enter the start point:/n"); printf(" xa= "); scanf("%d",&xa); printf(" ya= "); scanf("%d",&ya); printf("please enter the end point:/n"); printf(" xb= "); scanf("%d",&xb); printf(" yb= "); scanf("%d",&yb); dx=xb-xa; dy=yb-ya; if(abs(dx)>abs(dy)) steps=abs(dx); else steps=abs(dy); fx=(float)dx/(float)steps; fy=(float)dy/(float)steps; x=xa; y=ya; putpixel(x,y,RED); for(k=1;k<=steps;k++) { x+=fx; y+=fy; putpixel(x,y,RED); if(k%10==0) { printf(" xc=%.2f yc=%.2f/n",x,y); getch(); } } }