/**
 * Energy meter
 */
int scrWidth = 12*24*2;
int scrHeight = 240;

int binIs = 0;         // current bin to increment (1 of 12*24)
int[] dataCollection = new int[12*24];  // 24 hours x 12 bins per hour (1 every 5 mins)
int MPosX = 0;        // position of mouse within data window

String HoursS = "";
String MinsS = "";

void setup() {
  size(scrWidth, scrHeight);
  noStroke();
  smooth();
  rectMode(CORNER);
  noFill();
  background(0);  // clear (black) background
  PFont font;
  font = loadFont("ArialMT-14.vlw"); 
  textFont(font);
}

void draw() {
  int last24h = 0;
  binIs = hour()*12+minute()/5;
  if((second() == 0) && (5*(minute()/5) == minute())){
    dataCollection[binIs] = 0; // initialize bin to zero (write over every 24 hours)
    println("Time is "+hour()+":"+minute());  // print time every 5 minutes
  }
  background(0);  // clear (black) background
  stroke(255, 255, 255, 255);
  for (int x = 0; x < 24*12; x++){
    line(2*x,scrHeight,2*x,scrHeight-dataCollection[x]);
  }
  for (int x = 0; x < 24*12; x++){  // evaluate last 24h cumulative
    last24h += dataCollection[x];
  }
  MPosX = mouseX/2;
  if (MPosX >= 12*24) MPosX = 12*24-1;
  text(nf(MPosX/12,2)+":"+nf(5*(MPosX%12),2)+"   kWh "+float(dataCollection[MPosX])/1000+"       last 24 hours : kWh "+float(last24h)/1000,5,14);
}

void mousePressed() {
  dataCollection[binIs]++;
}