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  1. /*
  2.  * dials.c
  3.  *
  4.  *  Created on: 22 Jan 2016
  5.  *      Author: Mike
  6.  */
  7.  
  8. #include "libOLED/ap_math.H"
  9. #include "libOLED/displayclass.H"
  10. #include "libOLED/fontclass.H"
  11. #include "libOLED/displayDial.H"
  12.  
  13. static ap_math math;
  14. // this is the number of degrees between top centre of scale and
  15. // left or right hand end of scale : 90 degrees produces a semicircle.
  16.  
  17. displayDial_t::displayDial_t(display_t &display, uint8_t x, uint8_t y, uint8_t siz, uint16_t angle_) : m_display(display), m_xo(x), m_yo(y), m_siz(siz), m_a1(angle_)
  18. {
  19. }
  20.  
  21. /* position is integer from 0 to SINE_STEPS */
  22. void displayDial_t::draw_needle(int16_t position)
  23. {
  24.   int ang = math.SINE_SCALING * ((position - (math.SINE_STEPS / 2)) * m_a1) / (math.SINE_STEPS / 2);
  25.  
  26.   int si = math.ap_sin(ang);
  27.   int co = math.ap_cos(ang);
  28.  
  29.   /* calculate a shift for a second side of the needle */
  30.   int xl = math.ap_sin(ang - math.SINE_STEPS);
  31.   int yl = math.ap_cos(ang - math.SINE_STEPS);
  32.  
  33.   int si2 = m_siz + 2;
  34.   int si3 = 2 * m_siz / 3;
  35.  
  36.   int xs, ys;
  37.   // three parallel lines
  38.   xs = -xl;
  39.   ys = -yl;
  40.   int step;
  41.   for (step = 0; step < 3; step++)
  42.   {
  43.     m_display.drawLine(math.AP_SCALE(si * si2 - xs) + m_xo, m_yo - math.AP_SCALE(co * si2 - ys),
  44.  
  45.                        math.AP_SCALE(si * si3 - xs) + m_xo, m_yo - math.AP_SCALE(co * si3 - ys), INVERT);
  46.     xs += xl;
  47.     ys += yl;
  48.   }
  49. }
  50.  
  51. void displayDial_t::draw_scale(int16_t low, int16_t high, uint8_t width, uint8_t num_step, int16_t scale)
  52. {
  53.  
  54.   int ang;
  55.   m_low = low;
  56.   m_high = high;
  57.   int sc_low = low / scale;
  58.   int sc_high = high / scale;
  59.   int step = 256 * m_a1 * 2 / (4 * (sc_high - sc_low));
  60.   int t;
  61.   ang = -m_a1 * 256;
  62.   for (t = sc_low * 4; t <= sc_high * 4; t++)
  63.   {
  64.     int si = math.ap_sin((ang * math.SINE_SCALING) / 256);
  65.     int co = math.ap_cos((ang * math.SINE_SCALING) / 256);
  66.  
  67.     int len;
  68.     switch (t % 4)
  69.     {
  70.     case 0:
  71.       len = width;
  72.       break;
  73.     case 1:
  74.     case 3:
  75.     case -1:
  76.     case -3:
  77.       len = width / 4;
  78.       break;
  79.     case 2:
  80.     case -2:
  81.       len = width / 2;
  82.       break;
  83.     }
  84.  
  85.     m_display.drawLine(math.AP_SCALE((m_siz)*si) + m_xo, m_yo - math.AP_SCALE((m_siz)*co),
  86.                        math.AP_SCALE((m_siz - len) * si) + m_xo,
  87.                        m_yo - math.AP_SCALE((m_siz - len) * co), WHITE);
  88.     ang += step;
  89.   }
  90. }
  91.  
  92. void displayDial_t::draw_limits()
  93. {
  94.   m_display.fontSigDigits(small_font, 0, 56, 0, 10, m_low, WHITE);
  95.   m_display.fontSigDigits(small_font, 120, 56, 1, 10, m_high, WHITE);
  96. }
  97.  
  98.  
  99.  
  100.