65 lines
1.1 KiB
C++
65 lines
1.1 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <http://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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/*
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*
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* Graphical routines for drawing a disk.
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*
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*/
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#include "u_mem.h"
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#include "gr.h"
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#include "grdef.h"
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namespace dcx {
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#ifndef OGL
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int gr_disk(fix xc1,fix yc1,fix r1)
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{
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int p,x, y, xc, yc, r;
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r = f2i(r1);
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xc = f2i(xc1);
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yc = f2i(yc1);
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p=3-(r*2);
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x=0;
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y=r;
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// Big clip
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if ( (xc+r) < 0 ) return 1;
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if ( (xc-r) > GWIDTH ) return 1;
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if ( (yc+r) < 0 ) return 1;
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if ( (yc-r) > GHEIGHT ) return 1;
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const auto color = COLOR;
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while(x<y)
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{
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// Draw the first octant
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gr_scanline(xc-y, xc+y, yc-x, color);
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gr_scanline(xc-y, xc+y, yc+x, color);
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if (p<0)
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p=p+(x<<2)+6;
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else {
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// Draw the second octant
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gr_scanline(xc-x, xc+x, yc-y, color);
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gr_scanline(xc-x, xc+x, yc+y, color);
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p=p+((x-y)<<2)+10;
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y--;
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}
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x++;
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}
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if(x==y) {
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gr_scanline(xc-x, xc+x, yc-y, color);
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gr_scanline(xc-x, xc+x, yc+y, color);
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}
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return 0;
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}
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#endif
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}
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