#include<stdio.h> #include<conio.h> #include<graphics.h> #include<math.h> #include<dos.h> int l = 1 ; void ddaline ( int x1, int y1, int x2, int y2) { int s,dx,dy,m; float xi,yi,x,y; dx = x2 - x1; dy = y2 - y1; if (abs(dx) > abs(dy)) s = abs(dx); else s = abs(dy); xi = dx / ( float )s; yi = dy / ( float )s; x = x1; y = y1; putpixel(x1 + 0.5 ,y1 + 0.5 , 15 ); for (m = 0 ;m < s;m ++ ) { x += xi; y += yi; putpixel(x + 0.5 ,y + 0.5 , 15 ); } } void plotpoints1 ( int x, int y, int cx, int cy) { putpixel(cx + x,cy + y, 15 ); putpixel(cx - x,cy - y, 15 ); putpixel(cx - y,cy + x, 15 ); putpixel(cx + y,cy - x, 15 ); if (l % 20 == 0 ) { ddaline(cx - x,cy - y,cx + x,cy + y); ddaline(cx - y,cy + x,cx + y,cy - x); } l ++ ; } void plotpoints2 ( int x, int y, int cx, int cy) { putpixel(cx - x,cy + y, 15 ); putpixel(cx + x,cy - y, 15 ); putpixel(cx +...
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