| 0,0 → 1,101 |
|---|
| /*! |
| \file Draw_Circle.c |
| \author Mario Palomo <mpalomo@ihman.com> |
| \author Jose M. de la Huerga Fernández |
| \author Pepe González Mora |
| \date 05-2002 |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with this library; if not, write to the Free Foundation, |
| Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #define SDL_DRAW_PUTPIXEL_BPP(A, B, C) \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0+y)*super->pitch + \ |
| (x0+x)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0-y)*super->pitch + \ |
| (x0+x)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0+y)*super->pitch + \ |
| (x0-x)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0-y)*super->pitch + \ |
| (x0-x)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0+x)*super->pitch + \ |
| (x0+y)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0-x)*super->pitch + \ |
| (x0+y)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0+x)*super->pitch + \ |
| (x0-y)*SDL_DRAW_BPP)) = ##C##; \ |
| *(##A##(##B##(Uint8*)super->pixels + (y0-x)*super->pitch + \ |
| (x0-y)*SDL_DRAW_BPP)) = ##C##; |
| |
| #if SDL_DRAW_BPP == 1 |
| #define SDL_DRAW_PUTPIXEL SDL_DRAW_PUTPIXEL_BPP(0+,0+,color) |
| |
| #elif SDL_DRAW_BPP == 2 |
| #define SDL_DRAW_PUTPIXEL SDL_DRAW_PUTPIXEL_BPP((Uint16*),0+,color) |
| |
| #elif SDL_DRAW_BPP == 3 |
| #define SDL_DRAW_PUTPIXEL \ |
| SDL_DRAW_PUTPIXEL_BPP(0+,1+,colorbyte1) \ |
| if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ |
| SDL_DRAW_PUTPIXEL_BPP(0+,0+,colorbyte2) \ |
| SDL_DRAW_PUTPIXEL_BPP(0+,2+,colorbyte0) \ |
| }else{ \ |
| SDL_DRAW_PUTPIXEL_BPP(0+,0+,colorbyte0) \ |
| SDL_DRAW_PUTPIXEL_BPP(0+,2+,colorbyte2) \ |
| } |
| |
| #elif SDL_DRAW_BPP == 4 |
| #define SDL_DRAW_PUTPIXEL SDL_DRAW_PUTPIXEL_BPP((Uint32*),0+,color) |
| |
| #endif /*SDL_DRAW_BPP*/ |
| |
| |
| void SDL_DRAWFUNCTION(SDL_Surface *super, |
| Sint16 x0, Sint16 y0, Uint16 r, |
| Uint32 color) |
| { |
| #if SDL_DRAW_BPP == 3 |
| Uint8 colorbyte0 = (Uint8) (color & 0xff); |
| Uint8 colorbyte1 = (Uint8) ((color >> 8) & 0xff); |
| Uint8 colorbyte2 = (Uint8) ((color >> 16) & 0xff); |
| #endif |
| |
| Sint16 x = 0; |
| Sint16 y = r-1; /*radius zero == draw nothing*/ |
| Sint16 d = 3 - 2*r; |
| Sint16 diagonalInc = 10 - 4*r; |
| Sint16 rightInc = 6; |
| |
| while (x <= y) { |
| |
| SDL_DRAW_PUTPIXEL |
| |
| if (d >= 0) { |
| d += diagonalInc; |
| diagonalInc += 8; |
| y -= 1; |
| } else { |
| d += rightInc; |
| diagonalInc += 4; |
| } |
| rightInc += 4; |
| x += 1; |
| } |
| |
| }/*Draw_Circle*/ |
| |
| |
| #undef SDL_DRAW_PUTPIXEL |
| #undef SDL_DRAW_PUTPIXEL_BPP |
| |