src/Renderer/SymbolRenderer.cpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #include "SymbolRenderer.hpp"
  25 #include "Screen/Canvas.hpp"
  26
  27 #include <algorithm>
  28
  29 void
  30 SymbolRenderer::DrawArrow(Canvas &canvas, PixelRect rc, Direction direction)
  31 {
  32   assert(direction == UP || direction == DOWN ||
  33          direction == LEFT || direction == RIGHT);
  34
  35   PixelScalar size = std::min(rc.right - rc.left, rc.bottom - rc.top) / 5;
  36   RasterPoint center = rc.GetCenter();
  37   RasterPoint arrow[3];
  38
  39   if (direction == LEFT || direction == RIGHT) {
  40     arrow[0].x = center.x + (direction == LEFT ? size : -size);
  41     arrow[0].y = center.y + size;
  42     arrow[1].x = center.x + (direction == LEFT ? -size : size);
  43     arrow[1].y = center.y;
  44     arrow[2].x = center.x + (direction == LEFT ? size : -size);
  45     arrow[2].y = center.y - size;
  46   } else if (direction == UP || direction == DOWN) {
  47     arrow[0].x = center.x + size;
  48     arrow[0].y = center.y + (direction == UP ? size : -size);
  49     arrow[1].x = center.x;
  50     arrow[1].y = center.y + (direction == UP ? -size : size);
  51     arrow[2].x = center.x - size;
  52     arrow[2].y = center.y + (direction == UP ? size : -size);
  53   }
  54
  55   canvas.DrawTriangleFan(arrow, 3);
  56 }
  57
  58 void
  59 SymbolRenderer::DrawSign(Canvas &canvas, PixelRect rc, bool plus)
  60 {
  61   PixelScalar size = std::min(rc.right - rc.left, rc.bottom - rc.top) / 5;
  62   RasterPoint center = rc.GetCenter();
  63
  64   // Draw horizontal bar
  65   canvas.Rectangle(center.x - size, center.y - size / 3,
  66                    center.x + size, center.y + size / 3);
  67
  68   if (plus)
  69     // Draw vertical bar
  70     canvas.Rectangle(center.x - size / 3, center.y - size,
  71                      center.x + size / 3, center.y + size);
  72 }