include/gfx/GP_CircleSeg.h

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2011 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #ifndef GFX_GP_CIRCLE_H
  27 #define GFX_GP_CIRCLE_H
  28
  29 #include "core/GP_Pixmap.h"
  30
  31 /*
  32  * Quadrants in cartesian space the center is set in the middle of the circle.
  33  *
  34  * First segment is where both x and y are possitive, second is where only y is
  35  * possitive, third is for both x and y negative and the last one for only y
  36  * negative.
  37  *
  38  * Note that on computer screen (and in in-memory bitmaps) cordinates for y
  39  * grows in the opposite direction to the standard cartesian plane.
  40  *
  41  * So first segment is actually down right, second is down left, third is up
  42  * left, and fourth is up right.
  43  */
  44 enum GP_CircleSegments {
  45         GP_CIRCLE_SEG1 = 0x01, /* First Quadrant  */
  46         GP_CIRCLE_SEG2 = 0x02, /* Second Quadrant */
  47         GP_CIRCLE_SEG3 = 0x04, /* Third Quadrant  */
  48         GP_CIRCLE_SEG4 = 0x08, /* Fourth Quadrant */
  49 };
  50
  51 /* Circle Segment */
  52
  53 void GP_CircleSeg(GP_Pixmap *pixmap, GP_Coord xcenter, GP_Coord ycenter,
  54                   GP_Size r, uint8_t seg_flag, GP_Pixel pixel);
  55
  56 void GP_CircleSeg_Raw(GP_Pixmap *pixmap, GP_Coord xcenter, GP_Coord ycenter,
  57                       GP_Size r, uint8_t seg_flag, GP_Pixel pixel);
  58
  59 /* Filled Circle Segment */
  60
  61 void GP_FillCircleSeg(GP_Pixmap *pixmap, GP_Coord xcenter, GP_Coord ycenter,
  62                       GP_Size r, uint8_t seg_flag, GP_Pixel pixel);
  63
  64 void GP_FillCircleSeg_Raw(GP_Pixmap *pixmap, GP_Coord xcenter, GP_Coord ycenter,
  65                           GP_Size r, uint8_t seg_flag, GP_Pixel pixel);
  66
  67 #endif /* GFX_GP_CIRCLE_H */