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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, int16_t angle_low, int16_t angle_high) : m_display(display), m_xo(x), m_yo(y), m_siz(siz), m_angleRange(angle_high - angle_low), m_angleLow(angle_low)
  18. {
  19. }
  20.  
  21. 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_angleRange(2 * angle_), m_angleLow(-angle_)
  22. {
  23. }
  24.  
  25. /* position is integer from 0 to SINE_STEPS */
  26. void displayDial_t::draw_needle(int16_t position)
  27. {
  28.   // int ang = math.SINE_SCALING * ((position - (math.SINE_STEPS / 2)) * m_a1) / (math.SINE_STEPS / 2);
  29.   int ang = (math.SINE_SCALING * position * m_angleRange) / math.SINE_STEPS + m_angleLow * math.SINE_SCALING;
  30.   int si = math.ap_sin(ang);
  31.   int co = math.ap_cos(ang);
  32.  
  33.   /* calculate a shift for a second side of the needle */
  34.   int xl = math.ap_sin(ang - math.SINE_STEPS);
  35.   int yl = math.ap_cos(ang - math.SINE_STEPS);
  36.  
  37.   int si2 = m_siz + 2;
  38.   int si3 = 2 * m_siz / 3;
  39.  
  40.   int xs, ys;
  41.   // three parallel lines
  42.   xs = -xl;
  43.   ys = -yl;
  44.   int step;
  45.   for (step = 0; step < 3; step++)
  46.   {
  47.     m_display.drawLine(math.AP_SCALE(si * si2 - xs) + m_xo, m_yo - math.AP_SCALE(co * si2 - ys),
  48.  
  49.                        math.AP_SCALE(si * si3 - xs) + m_xo, m_yo - math.AP_SCALE(co * si3 - ys), INVERT);
  50.     xs += xl;
  51.     ys += yl;
  52.   }
  53. }
  54.  
  55. void displayDial_t::draw_scale(int16_t low, int16_t high, uint8_t width, uint8_t num_step, int16_t scale)
  56. {
  57.  
  58.   int ang;
  59.   m_low = low;
  60.   m_high = high;
  61.   int sc_low = low / scale;
  62.   int sc_high = high / scale;
  63.   int step = 256 * m_angleRange / (4 * (sc_high - sc_low));
  64.   int t;
  65.   ang = m_angleLow * 256;
  66.   int d =  sc_low < sc_high ? 1 : -1;
  67.   t = sc_low * 4;
  68.   while(1)
  69.   {
  70.     int si = math.ap_sin((ang * math.SINE_SCALING) / 256);
  71.     int co = math.ap_cos((ang * math.SINE_SCALING) / 256);
  72.  
  73.     int len;
  74.     switch (t % 4)
  75.     {
  76.     case 0:
  77.       len = width;
  78.       break;
  79.     case 1:
  80.     case 3:
  81.     case -1:
  82.     case -3:
  83.       len = width / 4;
  84.       break;
  85.     case 2:
  86.     case -2:
  87.       len = width / 2;
  88.       break;
  89.     }
  90.  
  91.     m_display.drawLine(math.AP_SCALE((m_siz)*si) + m_xo, m_yo - math.AP_SCALE((m_siz)*co),
  92.                        math.AP_SCALE((m_siz - len) * si) + m_xo,
  93.                        m_yo - math.AP_SCALE((m_siz - len) * co), WHITE);
  94.    
  95.    if (t == sc_high * 4)
  96.     break;
  97.    
  98.     ang += step;
  99.     t += d;
  100.   }
  101. }
  102.  
  103. void displayDial_t::draw_limits()
  104. {
  105.   m_display.fontSigDigits(small_font, 0, 56, 0, 10, m_low, WHITE);
  106.   m_display.fontSigDigits(small_font, 120, 56, 1, 10, m_high, WHITE);
  107. }
  108.