Plot some AirNow data as a line graph

airnow-linegraph.js

#pragma strict

// Script to take AirNow AQI data and turn it into a line graph
// Data is assumed to be a time sequence for a single station, from the "Observations by Monitoring Site" query tool
// The data file should be in JSON format, and placed in a folder called "data" within the Assets folder
// This must be attached to a GameObject that has a Mesh Renderer and an empty Mesh Filter

// Using a Mesh Renderer, rather than a Line Renderer, allows us to set per-vertex colors.

import SimpleJSON;

function Start ()
    {
    // Categories start at 1, so entry 0 in the colormap is just a dummy value
    var colormap = [ Color.white, Color.green, Color.yellow, Color(1.0,0.5,0.0), Color.red, Color(0.7,0,0.3) ];
    var i:int;
	var myVertices = Array();
	var myColors = Array();
	var myTriangles = Array();
    var datastring = System.IO.File.ReadAllText("Assets/data/pm.json");
    var data = JSON.Parse(datastring);
	for (i=0; i < data.AsArray.Count; i++)
		{
		myVertices.push(Vector3(i,data[i]["AQI"].AsFloat/10.0,0));
		myColors.push(colormap[data[i]["Category"].AsInt]);
		myVertices.push(Vector3(i,data[i]["AQI"].AsFloat/10.0+0.1,0));
		myColors.push(colormap[data[i]["Category"].AsInt]);
		}
	for (i=0; i < data.AsArray.Count-1; i++)
		{
		myTriangles.push(i*2);
		myTriangles.push(i*2+1);
		myTriangles.push(i*2+2);
		myTriangles.push(i*2+1);
		myTriangles.push(i*2+3);
		myTriangles.push(i*2+2);
		}
	var m = GetComponent.<MeshFilter>().mesh;
    m.vertices = myVertices;
    m.triangles = myTriangles;
    m.colors = myColors;
    m.RecalculateNormals();
    }



function Update()
    {
    }