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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | pmbaty | 1 | /* |
| 2 | * This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>. |
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| 3 | * It is copyright by its individual contributors, as recorded in the |
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| 4 | * project's Git history. See COPYING.txt at the top level for license |
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| 5 | * terms and a link to the Git history. |
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| 6 | */ |
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| 7 | /* |
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| 8 | * |
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| 9 | * Graphical routines for drawing a disk. |
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| 10 | * |
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| 11 | */ |
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| 12 | |||
| 13 | #include "u_mem.h" |
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| 14 | #include "gr.h" |
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| 15 | #include "grdef.h" |
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| 16 | |||
| 17 | namespace dcx { |
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| 18 | |||
| 19 | #if !DXX_USE_OGL |
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| 20 | int gr_disk(grs_canvas &canvas, const fix xc1, const fix yc1, const fix r1, const uint8_t color) |
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| 21 | { |
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| 22 | int p,x, y, xc, yc, r; |
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| 23 | |||
| 24 | r = f2i(r1); |
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| 25 | xc = f2i(xc1); |
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| 26 | yc = f2i(yc1); |
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| 27 | p=3-(r*2); |
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| 28 | x=0; |
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| 29 | y=r; |
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| 30 | |||
| 31 | // Big clip |
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| 32 | if (xc + r < 0) |
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| 33 | return 1; |
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| 34 | if (xc - r > canvas.cv_bitmap.bm_w) |
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| 35 | return 1; |
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| 36 | if (yc + r < 0) |
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| 37 | return 1; |
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| 38 | if (yc - r > canvas.cv_bitmap.bm_h) |
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| 39 | return 1; |
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| 40 | |||
| 41 | while(x<y) |
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| 42 | { |
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| 43 | // Draw the first octant |
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| 44 | gr_scanline(canvas, xc-y, xc+y, yc-x, color); |
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| 45 | gr_scanline(canvas, xc-y, xc+y, yc+x, color); |
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| 46 | |||
| 47 | if (p<0) |
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| 48 | p=p+(x<<2)+6; |
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| 49 | else { |
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| 50 | // Draw the second octant |
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| 51 | gr_scanline(canvas, xc-x, xc+x, yc-y, color); |
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| 52 | gr_scanline(canvas, xc-x, xc+x, yc+y, color); |
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| 53 | p=p+((x-y)<<2)+10; |
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| 54 | y--; |
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| 55 | } |
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| 56 | x++; |
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| 57 | } |
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| 58 | if(x==y) { |
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| 59 | gr_scanline(canvas, xc-x, xc+x, yc-y, color); |
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| 60 | gr_scanline(canvas, xc-x, xc+x, yc+y, color); |
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| 61 | } |
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| 62 | return 0; |
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| 63 | } |
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| 64 | |||
| 65 | #endif |
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| 66 | |||
| 67 | } |