// Normal distribution
let normalDist = (x, m, t) => +Math.exp(-Math.pow((m - x), 2) / (2 * Math.pow(t, 2))).toFixed(3);
    
// Distribution data
let plotData = [],
    mX1 = -150, mY1 = 180,
    mX2 = 140, mY2 = 80,
    mX3 = -150, mY3 = -90,
    tX1 = 5, tY1 = 10,
    tX2 = 10, tY2 = 5,
    tX3 = 5, tY3 = 5,
    circleNr = 2000,
    pa, g, resCoords = [];

// Add circle
let addCircle = (cx, cy, color) => {
  plotData.push({
    x: cx,
    y: cy,
    c: color
});
  
  renderCircles();
}
    
// Generation algorhithm
let generateCoords = () => {
  let plotZone = Math.floor(d3.randomUniform(3)()),
      newX = d3.randomUniform(-300, 300)(),
      newY = d3.randomUniform(-300, 300)(),
      newColor;
      
      switch (plotZone) {
          case 0:
            newColor = 'red';
            break;
            
           case 1:
            newColor = 'green';
            break;
            
           case 2:
            newColor = 'blue';
            break;
            
          default:
          	newColor = 'black';
            break;
        }
			
      do {
        newX = d3.randomUniform(-300, 300)();
        switch (plotZone) {
          case 0:
            g = normalDist(newX, mX1, tX1);
            break;
            
           case 1:
            g = normalDist(newX, mX2, tX2);
            break;
            
           case 2:
            g = normalDist(newX, mX3, tX3);
            break;
            
          default:
            break;
        }
        pa = +d3.randomUniform(1)().toFixed(3);
      } while (g < pa);
      
      do {
        newY = d3.randomUniform(-300, 300)();
        switch (plotZone) {
          case 0:
            g = normalDist(newY, mY1, tY1);
            break;
            
           case 1:
            g = normalDist(newY, mY2, tY2);
            break;
            
           case 2:
            g = normalDist(newY, mY3, tY3);
            break;
            
          default:
            break;
        }
        pa = +d3.randomUniform(1)().toFixed(4);
      } while (g < pa);
      
       //console.log(newX, newY, newColor);
      resCoords.push({
        x: newX,
        y: newY,
        color: newColor
      });
      addCircle(Math.floor(newX), Math.floor(newY), newColor);
    };