67 lines
1.2 KiB
C++
67 lines
1.2 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <https://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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namespace dcx {
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#if !DXX_USE_OGL
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int gr_disk(grs_canvas &canvas, const fix xc1, const fix yc1, const fix r1, const uint8_t color)
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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)
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return 1;
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if (xc - r > canvas.cv_bitmap.bm_w)
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return 1;
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if (yc + r < 0)
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return 1;
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if (yc - r > canvas.cv_bitmap.bm_h)
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return 1;
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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(canvas, xc-y, xc+y, yc-x, color);
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gr_scanline(canvas, 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(canvas, xc-x, xc+x, yc-y, color);
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gr_scanline(canvas, 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(canvas, xc-x, xc+x, yc-y, color);
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gr_scanline(canvas, 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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