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index.html
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<!DOCTYPE html>
<!--
LICENSE
MapMind was developed by Harmen G. Zijp at the Cooperative University of Amersfoort. The code is distributed under the Simple Public License 2.0 which can be found at https://opensource.org/licenses/Simple-2.0
Contact: harmen [at] universiteitamersfoort [dot] nl
-->
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<title>MapMind</title>
<link rel="stylesheet" href="style/ol.css" type="text/css">
<link rel="stylesheet" href="style/mapmind.css" type="text/css">
<link rel="icon" type="image/png" href="img/favicon.ico">
<script src="js/ol.js" type="text/javascript"></script>
<script src="js/proj4.js" type="text/javascript"></script>
<script src="js/webgl-utils.js" type="text/javascript"></script>
<script src="js/geotiff.js" type="text/javascript"></script>
<script src="js/mapmind.js" type="text/javascript"></script>
</head>
<body onload="parseSettings();">
<div id="nowebgl" class="alert alert-error" style="display: none"></div>
<div id="map"></div>
<div id="loadingicon" class="cssload-clock"></div>
<div id="countries">
<a href="/nl"><img class="flag" src="img/nl.svg"/></a>
<a href="/no"><img class="flag" src="img/no.svg"/></a>
</div>
<div id="controls">
<div id="watercontrol">
<table>
<tr class="hideonmobile">
<th id="label_actions"></th>
<td>
<span onclick="addSource();" id="label_addsource" data-tooltip="Voeg een bron toe op de kaart"><img class="icon" src="img/source.svg"/></span>
<span onclick="addSink();" id="label_addsink" data-tooltip="Voeg een put toe op de kaart"><img class="icon" src="img/sink.svg"/></span>
<span onclick="sculpt();" id="label_sculpt" data-tooltip="Interpoleer de hoogtes tussen twee punten op de kaart"><img class="icon" src="img/shovel.svg"/></span>
<span onclick="togglesimulation();" id="label_togglesimulation" data-tooltip="Start/stop simulatie"><img id="playicon" class="icon" src="img/play.svg"/></span>
<span onclick="togglerain();" id="label_togglerain" data-tooltip="Neerslag aan/uit"><img id="rainicon" class="icon" src="img/rainoff.svg"/></span>
<span onclick="shareSettings();" id="label_share" data-tooltip="Deel"><img id="shareicon" class="icon" src="img/share.svg"/></span>
</td>
</tr>
<tr class="hideonmobile">
<th id="label_elevation"></th>
<td id="elevation"></td>
</tr>
<tr>
<th id="label_waterlevel"></th>
<td><input type="range" id="waterlevel" value="0" style="width:80px; margin-left:0px;" /><input type="number" id="level" value="0" style="width:50px; margin-left:0px;" /> m</td>
</tr>
<tr class="hideonmobile">
<th id="label_dataset"></th>
<td>
<select id="dataset">
<option value="DTM" id="label_terrain" selected="selected"></option>
<option value="DSM" id="label_surface"></option>
</select>
</td>
</tr>
</table>
</div>
<div id="logo">
<a href="https://universiteitamersfoort.nl"><img src="img/cua.png" /></a>
</div>
<button id="showahn" onclick="loadahn();"></button><span onclick="toggleHelp();" data-tooltip="Help"><img id="helpicon" class="icon" src="img/help.svg"/></span>
</div>
<script>
"use strict";
var config;
var xhr = new XMLHttpRequest();
var url = 'config.json';
xhr.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
config = JSON.parse(this.responseText);
var path = window.location.pathname.split( '/' );
config = path[1] && config[path[1]] ? config[path[1]] : config['nl'];
document.getElementById('label_actions').innerHTML = config.language.actions;
document.getElementById('label_elevation').innerHTML = config.language.elevation;
document.getElementById('label_waterlevel').innerHTML = config.language.waterlevel;
document.getElementById('label_dataset').innerHTML = config.language.dataset;
document.getElementById('label_terrain').innerHTML = config.language.terrain;
document.getElementById('label_surface').innerHTML = config.language.surface;
document.getElementById('label_addsource').setAttribute('data-tooltip', config.language.addsource);
document.getElementById('label_addsink').setAttribute('data-tooltip', config.language.addsink);
document.getElementById('label_sculpt').setAttribute('data-tooltip', config.language.sculpt);
document.getElementById('label_togglesimulation').setAttribute('data-tooltip', config.language.togglesimulation);
document.getElementById('label_togglerain').setAttribute('data-tooltip', config.language.togglerain);
document.getElementById('label_share').setAttribute('data-tooltip', config.language.share);
document.getElementById('showahn').innerHTML = config.language.showelevationmap;
document.getElementById('nowebgl').innerHTML = config.language.warningnowebgl;
}
};
xhr.open('GET', url, false);
xhr.send();
// define projection
proj4.defs(config.projection.epsg, config.projection.proj4def);
var projection = new ol.proj.Projection({
code: config.projection.epsg,
extent: config.projection.extent
});
// generate resolutions and matrixIds arrays for WMTS
var resolutions = config.backgroundmap.resolutions;
var matrixIds = new Array(resolutions.length);
for (var z = 0; z < resolutions.length; ++z) matrixIds[z] = config.projection.epsg + ':' + z;
var tileGrid = new ol.tilegrid.WMTS({
origin: ol.extent.getTopLeft(projection.getExtent()),
resolutions: resolutions,
matrixIds: matrixIds
});
// create background layer
var topography = new ol.layer.Tile({
source: new ol.source.WMTS({
url: config.backgroundmap.wmts,
crossOrigin: 'anonymous',
layer: config.backgroundmap.layer,
format: 'image/png',
matrixSet: config.projection.epsg,
tileGrid: tileGrid,
attributions: [
new ol.Attribution({
html: config.language.attribution
})
],
style: 'default',
dimensions: {
'threshold': 100
}
}),
});
// perform webgl check and show error message when not available
if (!ol.has.WEBGL) document.getElementById('nowebgl').style.display = '';
function loadShader(url, id, type) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.overrideMimeType("text/plain");
request.addEventListener('load', function() {
var script = document.createElement('script');
script.setAttribute("id", id);
script.setAttribute("type", type);
script.text = request.responseText;
document.getElementsByTagName("head")[0].appendChild(script);
});
request.send();
}
loadShader("glsl/colormap.vsh", "colormap-vertex-shader", "x-shader/x-vertex");
loadShader("glsl/colormap.fsh", "colormap-fragment-shader", "x-shader/x-fragment");
loadShader("glsl/automaton.vsh", "automaton-vertex-shader", "x-shader/x-vertex");
loadShader("glsl/automaton.fsh", "automaton-fragment-shader", "x-shader/x-fragment");
loadShader("glsl/sculpt.vsh", "sculpt-vertex-shader", "x-shader/x-vertex");
loadShader("glsl/sculpt.fsh", "sculpt-fragment-shader", "x-shader/x-fragment");
var settings = {
"view": {
"coords": config.init.coords,
"zoom": config.init.zoom
},
"showahn": false,
"dataset": config.init.dataset,
"level": config.init.level,
"sculpts": [],
"sources": [],
"sinks": []
};
// create AHN overlay
var ahnLoaded = false;
var ahnManipulate = false;
var ahnDrag = false;
var ahnState = 'init';
var bbox;
var width;
var height;
var gl;
var data;
var zmin, zmax;
var nodata;
var dw = 0.1;
var raining = 0.0;
var simulate = false;
var maxSources = 16;
var sourcesCoordList = new Float32Array(32);
var maxSinks = 16;
var sinksCoordList = new Float32Array(32);
var shaderColormap;
var shaderAutomaton;
var shaderSculpt;
var texCoordBuffer;
var fboCoordBuffer;
var textureElevationA;
var textureElevationB;
var textureWaterLevelA;
var textureWaterLevelB;
var fboWaterLevelA;
var fboWaterLevelB;
var fboElevationA;
var fboElevationB;
var glCanvas = null;
var ahnInit = function(extent, resolution, pixelRatio, size, projection) {
if (glCanvas) glCanvas.remove();
glCanvas = document.createElement("canvas");
glCanvas.setAttribute('width', size[0]);
glCanvas.setAttribute('height', size[1]);
gl = getWebGLContext(glCanvas, {}, {noTitle: true});
// Get A WebGL context
if (!gl) {
alert('no webgl context');
return;
}
// Enable float textures
var floatTextures = gl.getExtension('OES_texture_float');
if (!floatTextures) {
alert('no floating point texture support');
return;
}
// Create vertex buffer for the texture coordinates
texCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
0.0, 0.0,
1.0, 0.0,
0.0, 1.0,
0.0, 1.0,
1.0, 0.0,
1.0, 1.0]),
gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
// Load shader programs
shaderColormap = createProgramFromScripts(gl, ["colormap-vertex-shader", "colormap-fragment-shader"]);
shaderAutomaton = createProgramFromScripts(gl, ["automaton-vertex-shader", "automaton-fragment-shader"]);
shaderSculpt = createProgramFromScripts(gl, ["sculpt-vertex-shader", "sculpt-fragment-shader"]);
// Create empty waterlevel texture A
textureWaterLevelA = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, textureWaterLevelA);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, null);
gl.bindTexture(gl.TEXTURE_2D, null);
// Create waterlevel framebuffer A and attach texture to it
fboWaterLevelA = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fboWaterLevelA);
fboWaterLevelA.width = width;
fboWaterLevelA.height = height;
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureWaterLevelA, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
// Create empty waterlevel texture B
textureWaterLevelB = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, textureWaterLevelB);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, null);
gl.bindTexture(gl.TEXTURE_2D, null);
// Create waterlevel framebuffer B and attach texture to it
fboWaterLevelB = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fboWaterLevelB);
fboWaterLevelB.width = width;
fboWaterLevelB.height = height;
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureWaterLevelB, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
fboCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, fboCoordBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
0, 0,
width, 0,
0, height,
0, height,
width, 0,
width, height]),
gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
loaddata();
map.on('pointermove', function(e) {
if (data && !ahnManipulate && !ahnDrag) {
var pixel = ahnGetPixelFromCoordinate(e.coordinate);
var x = Math.round(pixel[0]);
var y = Math.round(pixel[1]);
if (x>0 && x<width && y>0 && y<height) {
var h = data[y*width+x];
// read water level from texture
var pixels = new Float32Array(4);
gl.bindFramebuffer(gl.FRAMEBUFFER, fboWaterLevelA);
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE) {
gl.readPixels(x, y, 1, 1, gl.RGBA, gl.FLOAT, pixels);
}
// unbind this framebuffer so its memory can be reclaimed.
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
var wl = dw * (pixels[0]*255.0+pixels[1]);
var flow = 10.0 * dw * pixels[2];
document.getElementById('elevation').innerHTML = (h==nodata) ? '' : h.toFixed(2) + ' ' + config.language.waterlevelunit
+ ', ' + wl.toFixed(2) + ' m water'
+ ', ' + flow.toFixed(2) + ' m flow';
}
}
});
ahnState = 'draw';
}
var ahnGL = new ol.source.ImageCanvas({
canvasFunction: function(extent, resolution, pixelRatio, size, projection) {
switch(ahnState) {
case 'init': return ahnInit(extent, resolution, pixelRatio, size, projection); break;
case 'draw': if (ahn.getVisible() && ahnLoaded) return ahnDraw(extent, resolution, pixelRatio, size, projection); break;
}
}
});
var ahn = new ol.layer.Image({
source: ahnGL,
opacity: 0.8,
visible: false
});
var sourcesList = new ol.source.Vector({
features: []
});
var sources = new ol.layer.Vector({
source: sourcesList,
style: new ol.style.Style({
image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
anchor: [0.5, 0.5],
anchorXUnits: 'fraction',
anchorYUnits: 'fraction',
src: 'img/source.png'
}))
})
});
var sinksList = new ol.source.Vector({
features: []
});
var sinks = new ol.layer.Vector({
source: sinksList,
style: new ol.style.Style({
image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
anchor: [0.5, 0.5],
anchorXUnits: 'fraction',
anchorYUnits: 'fraction',
src: 'img/sink.png'
}))
})
});
var map = new ol.Map({
layers: [
topography,
ahn,
sources,
sinks
],
renderer: 'canvas',
target: 'map',
projection: config.projection.epsg,
view: new ol.View({
center: ol.proj.transform(settings.view.coords, 'EPSG:4326', config.projection.epsg),
zoom: settings.view.zoom
})
});
function ahnGetPixelFromCoordinate(coordinate) {
var pixel = map.getPixelFromCoordinate([coordinate[0], coordinate[1]]);
var mapOrigin = map.getPixelFromCoordinate([bbox[0], bbox[3]]);
var delta = [pixel[0]-mapOrigin[0], pixel[1]-mapOrigin[1]];
var zoomdelta = Math.pow(2, settings.view.zoom - map.getView().getZoom());
return [delta[0]*zoomdelta, delta[1]*zoomdelta];
}
// code to rescale map and ahn overlay when zooming or changing window size
function ahnRedisplay() {
ahnLoaded = false;
if (simulate) togglesimulation();
var size = map.getSize();
width = size[0];
height = size[1];
bbox = map.getView().calculateExtent(size);
settings.view.coords = ol.proj.transform(map.getView().getCenter(), config.projection.epsg, 'EPSG:4326');
settings.view.zoom = map.getView().getZoom();
if (ahn.getVisible()) {
document.getElementById('watercontrol').style.display = 'block';
document.getElementById('map').style.cursor = 'crosshair';
ahnState = 'init';
ahn.getSource().changed();
}
else {
map.un('pointermove');
}
}
ahnRedisplay();
function loadahn() {
settings.showahn = true;
ahn.setVisible(true);
document.getElementById('logo').style.display = 'none';
document.getElementById('watercontrol').style.display = 'block';
ahnRedisplay();
}
function showahn() {
settings.showahn = true;
ahn.setVisible(true);
document.getElementById('logo').style.display = 'none';
document.getElementById('watercontrol').style.display = 'block';
document.getElementById('showahn').innerHTML = config.language.hideelevationmap;
if (!ahnLoaded) ahnRedisplay();
}
function hideahn() {
settings.showahn = false;
ahn.setVisible(false);
document.getElementById('logo').style.display = 'block';
document.getElementById('watercontrol').style.display = 'none';
document.getElementById('showahn').innerHTML = config.language.hideelevationmap;
}
function toggleahn(obj) {
if (settings.showahn) hideahn();
else showahn();
}
function registerNewSource(coordinate) {
var newSource = new ol.Feature({
geometry: new ol.geom.Point(coordinate)
//,capacity: 1
});
sourcesList.addFeature(newSource);
document.getElementById('map').style.cursor = 'crosshair';
ahnManipulate = false;
}
function clickSource(e) {
registerNewSource(e.coordinate);
settings.sources.push(e.coordinate);
map.un('click', clickSource);
}
function addSource() {
if (sourcesList.getFeatures().length<maxSources) {
ahnManipulate = true;
document.getElementById('map').style.cursor = "url('img/source.png') 18 18, auto";
map.on('click', clickSource);
}
else alert('cannot add more than ' + maxSources + ' sources!');
}
function registerNewSink(coordinate) {
var newSink = new ol.Feature({
geometry: new ol.geom.Point(coordinate)
//,capacity: 1
});
sinksList.addFeature(newSink);
document.getElementById('map').style.cursor = 'crosshair';
ahnManipulate = false;
}
function clickSink(e) {
registerNewSink(e.coordinate);
settings.sinks.push(e.coordinate);
map.un('click', clickSink);
}
function addSink() {
if (sourcesList.getFeatures().length<maxSources) {
ahnManipulate = true;
document.getElementById('map').style.cursor = "url('img/sink.png') 18 18, auto";
map.on('click', clickSink);
}
else alert('cannot add more than ' + maxSinks + ' sinks!');
}
var elevationInterpolationData = new ol.source.Vector({wrapX: false});
var interpolation = new ol.layer.Vector({
source: elevationInterpolationData,
style: new ol.style.Style({
fill: new ol.style.Fill({
color: 'rgba(255, 255, 255, 0.2)'
}),
stroke: new ol.style.Stroke({
color: '#ffcc33',
width: 2
}),
image: new ol.style.Circle({
radius: 7,
fill: new ol.style.Fill({
color: '#ffcc33'
})
})
})
});
map.addLayer(interpolation);
var drawInterpolation; // global so we can remove it later
function sculpt() {
ahnManipulate = true;
map.getInteractions().forEach(function(interaction) { if (interaction instanceof ol.interaction.DragPan) { interaction.setActive(false); } }, this);
elevationInterpolationData.clear();
drawInterpolation = new ol.interaction.Draw({
source: elevationInterpolationData,
type: 'LineString',
maxPoints: 2
});
interpolation.setVisible(true);
map.addInteraction(drawInterpolation);
drawInterpolation.on('drawend', function(e) {
var feature = e.feature;
var geometry = feature.getGeometry();
var coordinates = geometry.getCoordinates();
var startCoord = ahnGetPixelFromCoordinate(coordinates[0]);
var endCoord = ahnGetPixelFromCoordinate(coordinates[coordinates.length-1]);
ahnInterpolate(startCoord, endCoord);
settings.sculpts.push([coordinates[0], coordinates[coordinates.length-1]]);
interpolation.setVisible(false);
map.removeInteraction(drawInterpolation);
ahn.getSource().changed();
ahnManipulate = false;
map.getInteractions().forEach(function(interaction) { if (interaction instanceof ol.interaction.DragPan) { interaction.setActive(true); } }, this);
});
}
function togglerain(obj) {
raining = raining? 0.0 : 0.001;
document.getElementById('rainicon').src = raining > 0 ? 'img/rainon.svg' : 'img/rainoff.svg';
}
var simfunc;
function togglesimulation(obj) {
simulate = !simulate;
document.getElementById('playicon').src = simulate ? 'img/pause.svg' : 'img/play.svg';
if (simulate) {
for (var i=0; i<sourcesList.getFeatures().length; i++) {
var coord = sourcesList.getFeatures()[i].getGeometry().getCoordinates();
var pixcoord = ahnGetPixelFromCoordinate(coord);
sourcesCoordList[2*i] = pixcoord[0]/width;
sourcesCoordList[2*i+1] = pixcoord[1]/height;
}
for (var i=0; i<sinksList.getFeatures().length; i++) {
var coord = sinksList.getFeatures()[i].getGeometry().getCoordinates();
var pixcoord = ahnGetPixelFromCoordinate(coord);
sinksCoordList[2*i] = pixcoord[0]/width;
sinksCoordList[2*i+1] = pixcoord[1]/height;
}
ahn.getSource().changed();
}
}
function loaddata() {
document.getElementById('loadingicon').style.visibility = 'visible';
var url = eval(config.elevationmap.wcs);
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'arraybuffer';
xhr.onload = function(e) {
// get data from tiff file
var tiff = GeoTIFF.parse(this.response).getImage();
data = tiff.readRasters({samples: [0]})[0];
// get min and max elevation
zmin = Number.MAX_VALUE;
zmax = Number.MIN_VALUE;
nodata = 3.4028234663852886e+38;
for (var i=0;i<data.length;i++) {
if (data[i]!=nodata) {
zmin = Math.min(zmin, data[i]);
zmax = Math.max(zmax, data[i]);
}
else {
var y = Math.floor(i/width);
var x = i - y*width;
var xm = x;
while(xm>=0) {
if (data[y*width + xm]!=nodata) break;
xm--;
}
var xp = x;
while(xp<width) {
if (data[y*width + xp]!=nodata) break;
xp++;
}
var ym = y;
while(ym>=0) {
if (data[ym*width + x]!=nodata) break;
ym--;
}
var yp = y;
while(yp<height) {
if (data[yp*width + x]!=nodata) break;
yp++;
}
var a = 0.0;
var n = 0;
if (xm>=0 && xp<width) {
a+= data[y*width + xp]*(x-xm)/(xp-xm) + data[y*width + xm]*(xp-x)/(xp-xm);
n++;
}
if (ym>=0 && yp<width) {
a+= data[yp*width + x]*(y-ym)/(yp-ym) + data[ym*width + x]*(yp-y)/(yp-ym);
n++;
}
if (n) data[i] = a/n;
}
}
// write elevation data into texture data
var pixels = new Float32Array(width*height*4);
for (var i=0;i<data.length;i++) {
if (data[i]!=nodata) {
var scaled = (data[i]-zmin)/(zmax-zmin) * 255.0;
var msb = Math.floor(scaled);
pixels[4*i] = msb / 255.0;
pixels[4*i+1] = scaled - msb;
}
else {
pixels[4*i] = 0;
pixels[4*i+1] = 0;
}
pixels[4*i+2] = 0;
pixels[4*i+3] = 0;
}
// Create elevation texture
textureElevationA = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, textureElevationA);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, pixels);
gl.bindTexture(gl.TEXTURE_2D, null);
// Create waterlevel framebuffer B and attach texture to it
fboElevationA = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fboElevationA);
fboElevationA.width = width;
fboElevationA.height = height;
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureElevationA, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
// Create elevation texture
textureElevationB = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, textureElevationB);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, pixels);
gl.bindTexture(gl.TEXTURE_2D, null);
// Create waterlevel framebuffer B and attach texture to it
fboElevationB = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fboElevationB);
fboElevationB.width = width;
fboElevationB.height = height;
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureElevationB, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
var waterlevel = settings.level;
if (waterlevel<zmin) waterlevel = zmin;
else if (waterlevel>zmax) waterlevel = zmax;
// waterlevel rounding to decimal place such that there are between 100 and 1000 steps between min and max level
var rounding = Math.pow(10,Math.floor(Math.log10((zmax-zmin)/100)));
document.getElementById("waterlevel").min = rounding * Math.floor(zmin/rounding);
document.getElementById("waterlevel").max = rounding * Math.ceil(zmax/rounding);
document.getElementById("waterlevel").value = waterlevel;
document.getElementById("level").value = waterlevel;
settings.level = waterlevel;
// More precise waterlevel selection when Control is pressed
document.onkeydown = function(e) {
if (e.keyCode === 17) {
document.getElementById("waterlevel").step = rounding / 10;
document.getElementById("level").step = rounding / 10;
}
}
document.onkeyup = function(e) {
if (e.keyCode === 17) {
document.getElementById("waterlevel").step = rounding;
document.getElementById("level").step = rounding;
}
}
document.getElementById("waterlevel").step = rounding;
document.getElementById("level").step = rounding;
document.getElementById("waterlevel").oninput = function() {
document.getElementById("level").value = document.getElementById("waterlevel").value;
settings.level = document.getElementById("waterlevel").value;
ahn.getSource().changed();
}
document.getElementById("level").oninput = function() {
document.getElementById("waterlevel").value = document.getElementById("level").value;
settings.level = document.getElementById("level").value;
ahn.getSource().changed();
}
document.getElementById("dataset").onchange = function() {
settings.dataset = document.getElementById('dataset').value;
ahnRedisplay();
}
ahnLoaded = true;
ahn.getSource().changed();
if (settings.sculpts.length) {
for (var i=0; i<settings.sculpts.length; i++) {
var startCoord = ahnGetPixelFromCoordinate(settings.sculpts[i][0]);
var endCoord = ahnGetPixelFromCoordinate(settings.sculpts[i][1]);
ahnInterpolate(startCoord, endCoord);
ahn.getSource().changed();
}
}
document.getElementById('loadingicon').style.visibility = 'hidden';
}
xhr.send();
}
function parseSettings() {
const urlParams = new URLSearchParams(window.location.search);
if(urlParams.has('settings')) {
settings = JSON.parse(window.atob(urlParams.get('settings')));
document.getElementById('dataset').value = settings.dataset;
document.getElementById('showahn').checked = settings.showahn;
map.setView(new ol.View({
center: ol.proj.transform(settings.view.coords, 'EPSG:4326', 'EPSG:28992'),
zoom: settings.view.zoom
}));
if (settings.showahn) {
showahn();
for (var i=0; i<settings.sources.length; i++) registerNewSource(settings.sources[i]);
for (var i=0; i<settings.sinks.length; i++) registerNewSink(settings.sinks[i]);
}
}
}
function shareSettings() {
var url = window.location.href.split('?')[0] + '?settings=' + window.btoa(JSON.stringify(settings));
var el = document.createElement('textarea');
el.value = url;
document.body.appendChild(el);
el.select();
document.execCommand('copy');
document.body.removeChild(el);
alert(config.language.urlcopied);
}
</script>
<!-- <script src="loader.js?id=mobile-full-screen" type="text/javascript"></script>-->
</body>
</html>