SDL_RasPiGraphLibrary.cpp

/*
 SDL_RasPiGraphLibrary.cpp - Class Library for RasPiConnect Graph Format.
 Created by SwitchDoc Labs August 4, 2014.
 Released into the public domain.
 */

#include "Arduino.h"

#include "SDL_RasPiGraphLibrary.h"

SDL_RasPiGraphLibrary::SDL_RasPiGraphLibrary(int maxItemCount, int Mode) {
  _Mode = SDL_MODE_LABELS;

  _currentItemCount = 0;
  _maxItemCount = maxItemCount;
  // Set up the value array.
  // Calculate the size of the buffer to be able to store the number of elements.
  // Allocate enough memory for "newelements" number of elements.

  _myFloatArray = (float *) malloc(_maxItemCount * sizeof(float));
}

int SDL_RasPiGraphLibrary::add_value(float value) {
  if (_currentItemCount == _maxItemCount) {
    // We need to remove the first and add the last.
    int i;
    for (i = 1; i < _currentItemCount; i++) {
      _myFloatArray[i - 1] = _myFloatArray[i];
    }
    _myFloatArray[_currentItemCount - 1] = value;
  } else {
    // Just add it on.
    _myFloatArray[_currentItemCount] = value;
    _currentItemCount++;
  }
}

void SDL_RasPiGraphLibrary::getRasPiString(char returnRasPiString[], char *buffer) {
  int i;
  strcpy(returnRasPiString, "");

  for (i = 0; i < _currentItemCount; i++) {
//    Serial.print("_currentItemCount=");
//    Serial.println(_currentItemCount);

    char tempString[30];
    char floatString[20];
    dtostrf((double) _myFloatArray[i], 6, 2, floatString);
    sprintf(tempString, "%s^^", floatString);

    strcat(returnRasPiString, tempString);
//    Serial.print("returnRasPiString =");
//    Serial.println(returnRasPiString);
  }

  if (strlen(returnRasPiString) > 2) {
    returnRasPiString[strlen(returnRasPiString) - 2] = '\0';
  }

  // Now add the labels.
  strcat(returnRasPiString, "||");

  for (i = 0; i < _currentItemCount; i++) {
    char tempString[20];
    sprintf(tempString, "%i^^", i);
    strcat(returnRasPiString, tempString);
  }

  if (strlen(returnRasPiString) > 2) {
    returnRasPiString[strlen(returnRasPiString) - 2] = '\0';
  }

//  Serial.print("returnRasPiString=");
//  Serial.println(returnRasPiString);

  strcpy(returnRasPiString, buffer);
}

void SDL_RasPiGraphLibrary::supply_labels(char *labels) {
}

float SDL_RasPiGraphLibrary::returnMaxValue() {
#define MINFLOAT ((float)-3.40282346638528860e+38)
  float Maximum;
  Maximum = MINFLOAT;
  int i;
  for (i = 0; i < _currentItemCount; i++) {
    if (_myFloatArray[i] > Maximum) {
      Maximum = _myFloatArray[i];
    }
  }
  return Maximum;
}

float SDL_RasPiGraphLibrary::returnMinValue() {
  float Minimum;
  Minimum = MAXFLOAT;
  int i;
  for (i = 0; i < _currentItemCount; i++) {
    if (_myFloatArray[i] < Minimum) {
      Minimum = _myFloatArray[i];
    }
  }
  return Minimum;
}