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| Rev | Author | Line No. | Line |
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| 1 | pmbaty | 1 | /* |
| 2 | * Portions of this file are copyright Rebirth contributors and licensed as |
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| 3 | * described in COPYING.txt. |
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| 4 | * Portions of this file are copyright Parallax Software and licensed |
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| 5 | * according to the Parallax license below. |
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| 6 | * See COPYING.txt for license details. |
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| 7 | |||
| 8 | THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX |
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| 9 | SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO |
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| 10 | END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A |
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| 11 | ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS |
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| 12 | IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS |
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| 13 | SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE |
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| 14 | FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE |
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| 15 | CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS |
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| 16 | AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE. |
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| 17 | COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED. |
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| 18 | */ |
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| 19 | |||
| 20 | |||
| 21 | #include "u_mem.h" |
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| 22 | |||
| 23 | #include "gr.h" |
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| 24 | #include "grdef.h" |
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| 25 | |||
| 26 | namespace dcx { |
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| 27 | |||
| 28 | #if !DXX_USE_OGL |
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| 29 | int gr_ucircle(grs_canvas &canvas, const fix xc1, const fix yc1, const fix r1, const color_palette_index color) |
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| 30 | { |
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| 31 | int p,x, y, xc, yc, r; |
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| 32 | |||
| 33 | r = f2i(r1); |
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| 34 | xc = f2i(xc1); |
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| 35 | yc = f2i(yc1); |
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| 36 | p=3-(r*2); |
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| 37 | x=0; |
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| 38 | y=r; |
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| 39 | |||
| 40 | while(x<y) |
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| 41 | { |
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| 42 | // Draw the first octant |
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| 43 | gr_upixel(canvas.cv_bitmap, xc - y, yc - x, color); |
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| 44 | gr_upixel(canvas.cv_bitmap, xc + y, yc - x, color); |
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| 45 | gr_upixel(canvas.cv_bitmap, xc - y, yc + x, color); |
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| 46 | gr_upixel(canvas.cv_bitmap, xc + y, yc + x, color); |
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| 47 | |||
| 48 | if (p<0) |
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| 49 | p=p+(x<<2)+6; |
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| 50 | else { |
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| 51 | // Draw the second octant |
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| 52 | gr_upixel(canvas.cv_bitmap, xc - x, yc - y, color); |
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| 53 | gr_upixel(canvas.cv_bitmap, xc + x, yc - y, color); |
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| 54 | gr_upixel(canvas.cv_bitmap, xc - x, yc + y, color); |
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| 55 | gr_upixel(canvas.cv_bitmap, xc + x, yc + y, color); |
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| 56 | p=p+((x-y)<<2)+10; |
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| 57 | y--; |
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| 58 | } |
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| 59 | x++; |
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| 60 | } |
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| 61 | if(x==y) { |
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| 62 | gr_upixel(canvas.cv_bitmap, xc - x, yc - y, color); |
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| 63 | gr_upixel(canvas.cv_bitmap, xc + x, yc - y, color); |
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| 64 | gr_upixel(canvas.cv_bitmap, xc - x, yc + y, color); |
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| 65 | gr_upixel(canvas.cv_bitmap, xc + x, yc + y, color); |
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| 66 | } |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |||
| 70 | #endif //!OGL |
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| 71 | |||
| 72 | } |