Refactor paths

examples/vga_spheres/src/main.cpp

@@ -0,0 +1,68 @@
+
+// ****************************************************************************
+//
+//                                 Main code
+//
+// ****************************************************************************
+
+#include "include.h"
+
+// Draw box
+ALIGNED u8 Box[WIDTHBYTE*HEIGHT];
+
+// main function
+int main()
+{
+	// initialize videomode
+	Video(DEV_VGA, RES_EGA, FORM_8BIT, Box);
+
+	// main loop
+	while (true)
+	{
+		// random radius
+		int r = RandU8MinMax(10,50);
+		int r2 = r*r;
+		int r3 = (r+r/4)*(r+r/4);
+
+		// random center coordinate
+		int xc = RandU16MinMax(r,WIDTH-r);
+		int yc = RandU16MinMax(r,HEIGHT-r);
+
+		// random color
+		u8 col = RandU8();
+
+		// loop Y
+		int x, y, dist;
+		u8* d;
+		for (y = -r; y < r; y++)
+		{
+			// pointer into draw box
+			d = &Box[WIDTHBYTE*(yc+y) + xc-r];
+
+			// loop X
+			for (x = -r; x < r; x++)
+			{
+				// distance from center
+				dist = x*x + y*y;
+
+				// inside sphere
+				if (dist <= r2)
+				{
+					// new center if right top edge
+					int x2 = x - r/4;
+					int y2 = y + r/4;
+					dist = x2*x2 + y2*y2;
+
+					// draw color or black
+					if (dist < RandU16Max(r3))
+						*d = col;
+					else
+						*d = COL_BLACK;
+				}
+
+				// increase destination pointer
+				d++;
+			}
+		}
+	}
+}