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2 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 "stm32l1xx_hal.h"
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#include "ap_math.h"
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#include "font.h"
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#include "SSD1306.h"
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#include "dials.h"
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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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static uint16_t a1 = 90;
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static uint8_t xo = 64;
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static uint8_t yo = 64;
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static uint8_t siz = 32;
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/* position is integer from 0 to SINE_STEPS */
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void
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dial_draw_needle (uint16_t position)
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{
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  int ang = SINE_SCALING * ((position - (SINE_STEPS/2)) * a1) / (SINE_STEPS/2);
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  int si = ap_sin (ang);
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  int co = ap_cos (ang);
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  /* calculate a shift for a second side of the needle */
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  int xl = ap_sin (ang - SINE_STEPS);
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  int yl = ap_cos (ang - SINE_STEPS);
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  int si2 = siz + 2;
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  int si3 = 2 * 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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    drawLine (AP_SCALE(si*si2-xs) + xo, yo - AP_SCALE(co * si2 - ys),
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    AP_SCALE(si*si3-xs) + xo,
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            yo - 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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/* initialise */
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void
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dial_size (uint8_t size)
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{
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  siz = size;
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}
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void dial_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 sz;
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  int ang;
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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 * a1 * 2 / (4 * (sc_high - sc_low));
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  int t;
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  ang = -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 = ap_sin ((ang*SINE_SCALING) / 256);
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      int co = ap_cos ((ang*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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      drawLine (AP_SCALE((siz)*si) + xo, yo - AP_SCALE((siz) * co),
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      AP_SCALE((siz-len)*si) + xo,
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                yo - AP_SCALE((siz - len) * co), 1);
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      ang += step;
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    }
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  font_sig_digits (0,7,0,10,low);
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  font_sig_digits(20,7,1,10,high);
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}
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void
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dial_origin (uint8_t x, uint8_t y)
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{
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  xo = x;
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  yo = y;
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}