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