// Names and consumption of various energy sources
   String[] energySource;
   float[] consumption;

color[] swatch = {color(247, 87, 87), color(247, 240, 87), color(97, 87, 247), 
   color(247, 87, 232), color(87, 247, 88), color(26, 11, 162)};

void setup() {
   size(600, 500);
   background(255);

 // Read Data
   String[] lines = loadStrings("EnergyData.txt");
   println("Read " + lines.length + " lines.");

 // Parse Data
   energySource = new String[lines.length];
   consumption = new float[lines.length];

 for (int i=0; i < lines.length; i++) {
   // split each line into pieces
   String[] pieces = split(lines[i], ",");

 energySource[i] =pieces[0];
   consumption[i] = float(pieces[1]);
   }
   println("...parsed.");
   } // setup()

void draw() {
   background(255);
   drawBarGraph(energySource, consumption);
   } // draw()

void drawBarGraph(String[] legend, float[] data) {
   float x = 0.1*width;
   float y = 0.7*height;
   float delta = 0.8*width/data.length;
   float w = 0.95*delta;

 for (int i=0; i < data.length; i++) {
   // compute the height of bar
   float h = map(data[i], 0, 100, 0, 0.7*height);

 // Draw bar
   if (inBox(mouseX, mouseY, x, y, w, h)) {
   fill(255, 0, 0);
   rect(x, y-h, w, h);
   fill(0);
   textAlign(CENTER);
   text(data[i], x+w/2, y-h-10);
   } 
   else {
   fill(0);
   rect(x, y-h, w, h);
   }

 // Draw name of data item
   textAlign(CENTER);
   text(legend[i], x+w/2, y+20);

 x = x + delta;
   }
   } // drawBarGraph()

boolean inBox(float px, float py, float x, float y, float w, float h) {
   return (px >=x && px <= x+w && py >= y-h && py <= y);
   } // inBox()

void drawPie(String[] legend, float[] data) {
   int pieX = width/2;
   int pieY = height/2;
   int pieSize = 250;

 float startAngle = 0.0;  // Pie variables
   float stopAngle = 0;

 int legendX = width-150;
   int legendY = 150;
   int legendDelta = 26;

 textSize(24);

 for (int i=0; i < data.length; i++) {
   // Size of i-th pie slice
   stopAngle = startAngle + data[i]*TWO_PI/100.0;

 // Draw i-th pie slice
   fill(swatch[i]);
   noStroke();
   arc(pieX, pieY, pieSize, pieSize, startAngle, stopAngle);

 // Draw Legend
   text(legend[i], legendX, legendY);
   legendY += legendDelta;

 // update for next pie slice
   startAngle = stopAngle;
   }

 fill(0);
   text("Energy Consumption\n% of Energy Sources\n(USA, 2005)", 75, 400);
   } // drawPie()