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4 mjames 1 
/*
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 * dials.c
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 *
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 *  Created on: 22 Jan 2016
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 *      Author: Mike
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 */
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#include "libOLED/ap_math.H"
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#include "libOLED/displayclass.H"
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#include "libOLED/fontclass.H"
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#include "libOLED/displayDial.H"
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static ap_math math;
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// this is the number of degrees between top centre of scale and
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// left or right hand end of scale : 90 degrees produces a semicircle.
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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_)
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{
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}
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/* position is integer from 0 to SINE_STEPS */
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void displayDial_t::draw_needle(int16_t position)
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{
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  int ang = math.SINE_SCALING * ((position - (math.SINE_STEPS / 2)) * m_a1) / (math.SINE_STEPS / 2);
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  int si = math.ap_sin(ang);
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  int co = math.ap_cos(ang);
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  /* calculate a shift for a second side of the needle */
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  int xl = math.ap_sin(ang - math.SINE_STEPS);
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  int yl = math.ap_cos(ang - math.SINE_STEPS);
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  int si2 = m_siz + 2;
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  int si3 = 2 * m_siz / 3;
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  int xs, ys;
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  // three parallel lines
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  xs = -xl;
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  ys = -yl;
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  int step;
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  for (step = 0; step < 3; step++)
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  {
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    m_display.drawLine(math.AP_SCALE(si * si2 - xs) + m_xo, m_yo - math.AP_SCALE(co * si2 - ys),
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                       math.AP_SCALE(si * si3 - xs) + m_xo, m_yo - math.AP_SCALE(co * si3 - ys), INVERT);
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    xs += xl;
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    ys += yl;
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  }
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}
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void displayDial_t::draw_scale(int16_t low, int16_t high, uint8_t width, uint8_t num_step, int16_t scale)
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{
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  int ang;
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  m_low = low;
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  m_high = high;
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  int sc_low = low / scale;
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  int sc_high = high / scale;
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  int step = 256 * m_a1 * 2 / (4 * (sc_high - sc_low));
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  int t;
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  ang = -m_a1 * 256;
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  for (t = sc_low * 4; t <= sc_high * 4; t++)
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  {
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    int si = math.ap_sin((ang * math.SINE_SCALING) / 256);
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    int co = math.ap_cos((ang * math.SINE_SCALING) / 256);
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    int len;
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    switch (t % 4)
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    {
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    case 0:
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      len = width;
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      break;
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    case 1:
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    case 3:
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    case -1:
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    case -3:
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      len = width / 4;
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      break;
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    case 2:
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    case -2:
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      len = width / 2;
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      break;
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    }
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    m_display.drawLine(math.AP_SCALE((m_siz)*si) + m_xo, m_yo - math.AP_SCALE((m_siz)*co),
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                       math.AP_SCALE((m_siz - len) * si) + m_xo,
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                       m_yo - math.AP_SCALE((m_siz - len) * co), WHITE);
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    ang += step;
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  }
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}
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void displayDial_t::draw_limits()
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{
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  m_display.fontSigDigits(small_font, 0, 56, 0, 10, m_low, WHITE);
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  m_display.fontSigDigits(small_font, 120, 56, 1, 10, m_high, WHITE);
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}