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wells-decay.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>Oil and Gas Wells</title>
<style>
html, body, #map-div, #loading {
margin: 0;
padding: 0;
height: 100%;
background-color: white;
}
#layers {
padding: 5px;
position: absolute;
top: 10px;
right: 10px;
background-color: white;
}
</style>
<link rel="stylesheet" type="text/css" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css">
<link rel="stylesheet" type="text/css" href="https://explorables.cmucreatelab.org/data-visualization-tools/css/defaultUI.css" />
</head>
<body>
<div id="loading"></div>
<div id="map-div"></div>
<div id="time-slider-controls"></div>
<div id="layers">Source: <br /></div>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3.24&key=AIzaSyCLQO-R8kYsKcyHki5SQ3B6mxxYoA1U2hY"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<script type="text/javascript" src="https://explorables.cmucreatelab.org/data-visualization-tools/js/CanvasLayer.js"></script>
<script type="text/javascript" src="https://explorables.cmucreatelab.org/data-visualization-tools/js/TimeSlider.js"></script>
<script type="text/javascript">
// draw "loading" pill wheel
for(var i=0, html; i<12; i++) html += "<rect x='46.5' y='40' width='7' height='20' rx='5' ry='5' fill='#00b2ff' transform='rotate(" + i*30 + " 50 50) translate(0 -30)'><animate attributeName='opacity' from='1' to='0' dur='1s' begin='" + (i+1)/12 + "s' repeatCount='indefinite'/></rect>";
document.getElementById('loading').innerHTML = '<svg style="position: absolute; top: 50%; left: 50%;" width="120px" height="120px" viewBox="0 0 100 100">' + html + '</svg>';
/**
* Define global variables and utility functions
*/
var map;
var canvasLayer;
var timeSlider;
var gl;
var mapMatrix = new Float32Array(16);
/* dataset parameters:
{
name: 'dataset-name', // required
url: 'dataset/url', // required
rgba: [1.0, 1.0, 0.0, 1.0],
enabled: true,
data: null,
points: 0,
program: null
} */
var datasets = [
{
name: 'combined-2018',
url: 'data/decay.bin'
} /* ,
{
name: 'mississippi',
url: 'data/ms.bin',
enabled: false
},
{
name: 'arkansas',
url: 'data/ar.bin',
enabled: false
} */
];
/**
* Given DOM reference to the vertex shader source and the fragement shader source,
* returns a compiled WebGL program. With error checking.
* @type {String}, {String}
*/
function createProgram(vertexSource, fragmentSource) {
// create vertex shader for points
var vertexSrc = document.getElementById(vertexSource).text; // assign text of source code for vertex-sharder
var vertexShader = gl.createShader(gl.VERTEX_SHADER); // create shader object
gl.shaderSource(vertexShader, vertexSrc); // pass source code to new shader object
gl.compileShader(vertexShader); // compile shader object
if (!gl.getShaderParameter(vertexShader, gl.COMPILE_STATUS)) // verify that shader compiled correctly
console.log(gl.getShaderInfoLog(vertexShader));
// create fragment shader for points
var fragmentSrc = document.getElementById(fragmentSource).text;
var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fragmentShader, fragmentSrc);
gl.compileShader(fragmentShader);
if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS))
console.log(gl.getShaderInfoLog(fragmentShader));
// link point shaders to create our program
program = gl.createProgram(); // create new program object
gl.attachShader(program, vertexShader); // attach shaders to program object
gl.attachShader(program, fragmentShader);
gl.linkProgram(program); // link shaders
if (!gl.getProgramParameter(program, gl.LINK_STATUS))
console.log(gl.getProgramInfoLog(program));
return program;
}
function loadData(obj) {
var xhr = new XMLHttpRequest();
xhr.open('GET', obj.url);
xhr.responseType = 'arraybuffer';
xhr.onload = function() {
obj.data = new Float32Array(this.response);
obj.dataLoaded = true;
initializeWebGL(obj);
if(obj.enabled != false) document.getElementById('loading').style.display = 'none';
}
xhr.send();
}
/**
* Called after data loaded into object.data. Loads data into a WebGL buffer
*/
function initializeWebGL(obj) {
obj.arrayBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, obj.arrayBuffer);
gl.bufferData(gl.ARRAY_BUFFER, obj.data, gl.STATIC_DRAW);
obj.attributeLocation = gl.getAttribLocation(obj.program, 'a_worldCoord');
obj.timeLocation = gl.getAttribLocation(obj.program, "a_time");
obj.u_ColorLocation = gl.getUniformLocation(obj.program, "u_Color");
obj.matrixLocation = gl.getUniformLocation(obj.program, 'u_mapMatrix');
obj.sliderLocation = gl.getUniformLocation(obj.program, 'u_sliderTime');
obj.count = obj.data.length / 3; // lat, lon, time
if(obj.enabled == null)
obj.enabled = true;
return obj;
}
/** Translate X and Y values to current canvas scale */
function resize() {
console.log('resize handler');
var w = gl.canvas.clientWidth;
var h = gl.canvas.clientHeight;
gl.viewport(0, 0, w, h);
var scale = canvasLayer.getMapScale();
var t = canvasLayer.getMapTranslation();
mapMatrix.set([ 2 * scale / w, 0, 0, 0,
0, scale * (-2/h), 0, 0,
0, 0, 0, 0,
-1 + (2* t.x * scale)/w, 1 + (-2 * t.y * scale)/h, 0, 1]);
}
/**
* Called by CanvasLayer (controlled, in turn, by TimeSlider).
* Link WebGL program to buffer data, update uniforms, and call draw WebGL function
*/
function drawPoints() {
for(var i = 0; i < datasets.length; i++) {
obj = datasets[i];
if(obj.enabled) {
gl.useProgram(obj.program)
gl.bindBuffer(gl.ARRAY_BUFFER, obj.arrayBuffer);
// enable the 'worldCoord' attribute in the shader to receive buffer
gl.enableVertexAttribArray(obj.attributeLocation);
gl.vertexAttribPointer(obj.attributeLocation, 2, gl.FLOAT, false, 12, 0); // tell webgl how buffer is laid out (lat, lon, time--4 bytes each)
// get the time values out of the buffer
gl.enableVertexAttribArray(obj.timeLocation);
gl.vertexAttribPointer(obj.timeLocation, 1, gl.FLOAT, false, 12, 8); // 8 byte offset
// set uniform values
gl.uniform4f(obj.u_ColorLocation, obj.rgba[0], obj.rgba[1], obj.rgba[2], obj.rgba[3]);
gl.uniformMatrix4fv(obj.matrixLocation, false, mapMatrix);
gl.uniform1f(obj.sliderLocation, timeSlider.getCurrentTime() / 1000.0); // we expect our datasets to have unix timestamps
// draw!
gl.drawArrays(gl.POINTS, 0, obj.count);
timeSlider.animate();
}
}
}
/**
* Initialize WebGL. Called when DOM ready
*/
function init() {
// initialize Google Map
var mapOptions = {
zoom: 5,
center: new google.maps.LatLng(39.3, -95.8),
mapTypeControl: true
};
var styledMapType = new google.maps.StyledMapType(
[{"featureType":"all","elementType":"labels.text.fill","stylers":[{"saturation":36},{"color":"#000000"},{"lightness":40}]},{"featureType":"all","elementType":"labels.text.stroke","stylers":[{"visibility":"on"},{"color":"#000000"},{"lightness":16}]},{"featureType":"all","elementType":"labels.icon","stylers":[{"visibility":"off"}]},{"featureType":"administrative","elementType":"geometry.fill","stylers":[{"color":"#000000"},{"lightness":20}]},{"featureType":"administrative","elementType":"geometry.stroke","stylers":[{"color":"#000000"},{"lightness":17},{"weight":1.2}]},{"featureType":"landscape","elementType":"geometry","stylers":[{"color":"#000000"},{"lightness":20}]},{"featureType":"poi","elementType":"geometry","stylers":[{"color":"#000000"},{"lightness":21}]},{"featureType":"road.highway","elementType":"geometry.fill","stylers":[{"color":"#000000"},{"lightness":17}]},{"featureType":"road.highway","elementType":"geometry.stroke","stylers":[{"color":"#000000"},{"lightness":29},{"weight":0.2}]},{"featureType":"road.arterial","elementType":"geometry","stylers":[{"color":"#000000"},{"lightness":18}]},{"featureType":"road.local","elementType":"geometry","stylers":[{"color":"#000000"},{"lightness":16}]},{"featureType":"transit","elementType":"geometry","stylers":[{"color":"#000000"},{"lightness":19}]},{"featureType":"water","elementType":"geometry","stylers":[{"color":"#000000"},{"lightness":17}]}]);
var mapDiv = document.getElementById('map-div');
map = new google.maps.Map(mapDiv, mapOptions);
map.addListener('bounds_changed', resize, false);
window.addEventListener('resize', function () { google.maps.event.trigger(map, 'resize') }, false);
map.mapTypes.set('styled_map', styledMapType);
map.setMapTypeId('styled_map');
// initialize the canvas layer
var canvasLayerOptions = {
map: map,
resizeHandler: resize,
animate: true,
updateHandler: drawPoints
};
canvasLayer = new CanvasLayer(canvasLayerOptions); // create a new canvas
// initialize the TimeSlider
var timeSliderOptions = {
startTime: new Date(1880,00,01).getTime(), // JavaScript counts months from zero. Date constructor defaults to local time
endTime: Date.now(),
dwellAnimationTime: 2 * 1000,
increment: 120*24*60*60*1000,
formatCurrentTime: function(date) { // Define time label
var month = date.getMonth() + 1, day = date.getDate();
return date.getFullYear() + '-' + (month < 10 ? '0' + month : month) + '-' + (day < 10 ? '0' + day : day);
},
animationRate: {
fast: 20,
medium: 40,
slow: 80
}
};
timeSlider = new TimeSlider(timeSliderOptions);
// initialize WebGL
gl = canvasLayer.canvas.getContext('experimental-webgl'); // initialize WebGL
if(gl == null) {
document.body.innerHTML = 'Error initializing WebGL. Check that you are using a supported browser and that hardware acceleration is enabled.';
return;
}
gl.enable( gl.BLEND );
gl.blendFunc( gl.SRC_ALPHA, gl.SRC_COLOR );
//gl.blendFunc( gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA );
//gl.blendFunc( gl.SRC_ALPHA, gl.ONE ); // explore alpha blending modes at: http://delphic.me.uk/webglalpha.html
//gl.blendFunc( gl.ONE_MINUS_CONSTANT_COLOR, gl.ONE_MINUS_SRC_ALPHA );
// setup our datasets
for (var i = 0; i < datasets.length; i++) {
datasets[i].program = createProgram('point-vertex-shader', 'point-fragment-shader');
if(datasets[i].rgba == null) // if no color is specified, grab one from our colorRamp
datasets[i].rgba = new Array([0.89, 0.1, 0.11, 1.0], [0.22, 0.49, 0.72, 1.0], [0.3, 0.69, 0.29, 1.0], [0.6, 0.31, 0.64, 1.0], [1., 0.5, 0, 1.0], [1., 1., 0.2, 1.0], [0.65, 0.34, 0.16, 1.0], [0.97, 0.51, 0.75, 1.0])[i%8];
loadData(datasets[i]); // load data asychronously
// add layer html
var checked = (datasets[i].enabled != null && datasets[i].enabled == false) ? '' : ' checked';
var html = '<label><input type="checkbox" name="' + i + '"' + checked + '/>' + datasets[i].name + '</label><br />';
document.getElementById('layers').innerHTML += html;
}
$(':checkbox').change(function() {
id = $(this).attr('name');
datasets[id].enabled = $(this).is(":checked");
gl.clear(gl.COLOR_BUFFER_BIT);
});
}
document.addEventListener('DOMContentLoaded', init, false);
</script>
<!-- Create WebGL Shaders -->
<script type="x-shader/x-vertex" id="point-vertex-shader">
attribute vec4 a_worldCoord;
attribute float a_time;
uniform float u_sliderTime;
uniform mat4 u_mapMatrix;
varying float v_age;
void main() {
// transform world coordinate by matrix uniform variable
if ( a_time > u_sliderTime) {
gl_Position = vec4(-1,-1,-1,-1); // if outside of time window function, do not display
} else {
gl_Position = u_mapMatrix * a_worldCoord;
}
gl_PointSize = 3.0;
v_age = u_sliderTime - a_time;
}
</script>
<script type="x-shader/x-vertex" id="point-fragment-shader">
precision mediump float;
uniform vec4 u_Color;
varying float v_age;
float year = 3.1536e7;
vec3 rgb2hsv(vec3 c) {
vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
float d = q.x - min(q.w, q.y);
float e = 1.0e-10;
return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
}
vec3 hsv2rgb(vec3 c) {
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
void main() {
float dist = distance( vec2(0.5, 0.5), gl_PointCoord);
if (dist > 0.5)
discard;
vec3 fragHSV = rgb2hsv(u_Color.rgb);
float years = (v_age - 2.0) / year;
float value = exp(-0.1*years);
vec3 fragRGB = hsv2rgb(vec3(fragHSV.xy, fragHSV.z*value));
gl_FragColor = vec4(fragRGB.rgb, u_Color.a);
}
</script>
</body>
</html>