PImage mapImage;
Table locationTable;
Table nameTable;
int rowCount;

Table dataTable;
float dataMin = -10;
float dataMax = 10;


void setup() {
  size(640, 400);
  mapImage = loadImage("map.png");
  locationTable = new Table("locations.tsv");
  nameTable = new Table("names.tsv");
  rowCount = locationTable.getRowCount();
  updateTable();
  
  PFont font = loadFont("Univers-Bold-12.vlw");
  textFont(font);

  smooth();
  noStroke();  
}

float closestDist;
String closestText;
float closestTextX;
float closestTextY;


void draw() {
  image(mapImage, 0, 0);
  
  closestDist = width*height;  // abritrarily high
  
  for (int row = 0; row < rowCount; row++) {
    String abbrev = dataTable.getRowName(row);
    float x = locationTable.getFloat(abbrev, 1);
    float y = locationTable.getFloat(abbrev, 2);
    drawData(x, y, abbrev);
  }
  
  if (closestDist != width*height) {
    fill(0);
    textAlign(CENTER);
    text(closestText, closestTextX, closestTextY);
  }
}


void drawData(float x, float y, String abbrev) {
  float value = dataTable.getFloat(abbrev, 1);  
  float radius = 0;
  if (value >= 0) {
    radius = map(value, 0, dataMax, 1.5, 15);
    fill(#333366);  // blue
  } else {
    radius = map(value, 0, dataMin, 1.5, 15);
    fill(#ec5166);  // red  
  }
  ellipseMode(RADIUS);
  ellipse(x, y, radius, radius);

  float d = dist(x, y, mouseX, mouseY);
  if ((d < radius + 2) && (d < closestDist)) {
    closestDist = d;
    String name = nameTable.getString(abbrev, 1);
    closestText = name + " " + nfp(value, 0, 2);
    closestTextX = x;
    closestTextY = y-radius-4;
  }
}


void keyPressed() {
  if (key == ' ') {
    updateTable();
  }
}


void updateTable() {  
  dataTable = new Table("http://benfry.com/writing/map/random.cgi");
}