drivers/displays/tft/controls/huechart.c

   1 /**************************************************************************/
   2 /*!
   3     @file     huechart.c
   4     @author   K. Townsend (microBuilder.eu)
   5
   6     @brief    Renders a hue/saturation/brightness chart
   7
   8     @section LICENSE
   9
  10     Software License Agreement (BSD License)
  11
  12     Copyright (c) 2012, K. Townsend
  13     All rights reserved.
  14
  15     Redistribution and use in source and binary forms, with or without
  16     modification, are permitted provided that the following conditions are met:
  17     1. Redistributions of source code must retain the above copyright
  18     notice, this list of conditions and the following disclaimer.
  19     2. Redistributions in binary form must reproduce the above copyright
  20     notice, this list of conditions and the following disclaimer in the
  21     documentation and/or other materials provided with the distribution.
  22     3. Neither the name of the copyright holders nor the
  23     names of its contributors may be used to endorse or promote products
  24     derived from this software without specific prior written permission.
  25
  26     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
  27     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  28     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  29     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
  30     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  31     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  33     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36 */
  37 /**************************************************************************/
  38 #include <string.h>
  39
  40 #include "huechart.h"
  41
  42 /**************************************************************************/
  43 /*!
  44     @brief  Draws a rectangular hue chart showing the full spectrum
  45                         of fully saturated colors
  46
  47     @param[in]  x
  48                 Starting x co-ordinate
  49     @param[in]  y
  50                 Starting y co-ordinate
  51     @param[in]  width
  52                 Width of the chart in pixels
  53     @param[in]  height
  54                 Width of the chart in pixels
  55 */
  56 /**************************************************************************/
  57 void huechartRender(uint16_t x, uint16_t y, uint16_t width, uint16_t height, theme_t theme)
  58 {
  59   uint32_t delta = (height - 2) / 6;
  60
  61   // Draw border
  62   drawRectangle(x, y, x+width, y+height, theme.colorBorderDarker);
  63
  64   // Draw gradient (R > M > B > C > G > Y > R)
  65   drawGradient(x+1, y+1, x+width-1, y+delta-1, COLOR_RED, COLOR_MAGENTA);
  66   drawGradient(x+1, y+delta, x+width-1, y+(delta*2)-1, COLOR_MAGENTA, COLOR_BLUE);
  67   drawGradient(x+1, y+(delta*2), x+width-1, y+(delta*3)-1, COLOR_BLUE, COLOR_CYAN);
  68   drawGradient(x+1, y+(delta*3), x+width-1, y+(delta*4)-1, COLOR_CYAN, COLOR_GREEN);
  69   drawGradient(x+1, y+(delta*4), x+width-1, y+(delta*5)-1, COLOR_GREEN, COLOR_YELLOW);
  70   drawGradient(x+1, y+(delta*5), x+width-1, y+height-1, COLOR_YELLOW, COLOR_RED);
  71 }