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multivariate-data-exploration.html
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<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<!--
ArcGIS API for JavaScript, https://js.arcgis.com
For more information about the visualization-sm-multivariate sample, read the original sample description at developers.arcgis.com.
https://developers.arcgis.com/javascript/latest/sample-code/visualization-sm-multivariate/index.html
-->
<title>Multivariate data exploration - 4.15</title>
<link
rel="stylesheet"
href="https://js.arcgis.com/4.15/esri/themes/light/main.css"
/>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
.widget-background {
background-color: white;
font-size: 12pt;
text-align: center;
padding: 6px;
width: 320px;
}
</style>
<script src="https://js.arcgis.com/4.15/"></script>
<script>
require([
"esri/WebMap",
"esri/views/MapView",
"esri/widgets/Legend",
"esri/widgets/Expand",
"esri/widgets/smartMapping/ColorSlider",
"esri/widgets/smartMapping/SizeSlider",
"esri/renderers/smartMapping/statistics/histogram",
"esri/renderers/smartMapping/statistics/summaryStatistics"
], function(
WebMap,
MapView,
Legend,
Expand,
ColorSlider,
SizeSlider,
histogram,
summaryStatistics
) {
// The web map must have one layer with a size
// and color visual variable set on the renderer
// (i.e. a Color + Size visualization)
const map = new WebMap({
portalItem: {
id: "b4cfa4a48dbb49b8b150c14bb6cca6f9"
}
});
const view = new MapView({
container: "viewDiv",
map: map
});
view.ui.move("zoom", "top-right");
view.ui.add(
new Legend({
view: view
}),
"bottom-left"
);
// Create the slider widgets for data exploration
view
.when(function() {
const layer = view.map.layers.getItemAt(0);
const renderer = layer.renderer;
const sizeVV = getVisualVariableByType(renderer, "size");
// give color visual variable meaningful description
// in the Legend
const colorVV = getVisualVariableByType(renderer, "color");
if (!sizeVV || !colorVV) {
console.error(
"Web map layer must have a Color + Size visualization."
);
return;
}
// Create an Expand instance and set the content
// property to the DOM node of the size slider widget
const sizeSliderExpand = new Expand({
view: view,
content: document.getElementById("size-container"),
expandIconClass: "esri-icon-pie-chart",
group: "top-left"
});
view.ui.add(sizeSliderExpand, "top-left");
// Create an Expand instance and set the content
// property to the DOM node of the color slider widget
const colorSliderExpand = new Expand({
view: view,
content: document.getElementById("color-container"),
expandIconClass: "esri-icon-environment-settings",
group: "top-left"
});
view.ui.add(colorSliderExpand, "top-left");
return getHistogramForVisualVariable(colorVV)
.then(function(colorHistogram) {
createColorSlider(layer, colorHistogram.bins);
return getHistogramForVisualVariable(sizeVV);
})
.then(function(sizeHistogram) {
return getStatsForVisualVariable(sizeVV).then(function(
statistics
) {
return createSizeSlider(layer, sizeHistogram, statistics);
});
});
})
.catch(function(error) {
console.error(error);
});
// Creates a new instance of the ColorSlider widget
// based on the renderer already saved to the layer
function createColorSlider(layer, histogramBins) {
const renderer = layer.renderer;
const theme = getTheme(renderer);
const colorVariable = getVisualVariableByType(renderer, "color");
const stats = getStatsFromVisualVariable(renderer, "color");
const colorSlider = new ColorSlider({
container: "color-slider",
primaryHandleEnabled: theme === "above-and-below",
stops: colorVariable.stops,
histogramConfig: {
bins: histogramBins,
average: stats.avg
},
min: stats.min,
max: stats.max
});
function changeEventHandler() {
const layer = view.map.layers.getItemAt(0);
const renderer = layer.renderer.clone();
const colorVariable = getVisualVariableByType(renderer, "color");
const sizeVariable = getVisualVariableByType(renderer, "size");
colorVariable.stops = colorSlider.stops;
renderer.visualVariables = [colorVariable, sizeVariable];
layer.renderer = renderer;
}
colorSlider.on(
["thumb-change", "thumb-drag", "min-change", "max-change"],
changeEventHandler
);
}
// Creates a new instance of the SizeSlider widget
// based on the renderer already saved to the layer
function createSizeSlider(layer, histogram, stats) {
const renderer = layer.renderer;
const sizeVariable = getVisualVariableByType(renderer, "size");
if (!stats) {
stats = getStatsFromVisualVariable(renderer, "size");
}
stats.stddev = null;
const sizeSlider = SizeSlider.fromRendererResult(
{
renderer: renderer,
statistics: stats,
visualVariables: [sizeVariable]
},
histogram
);
sizeSlider.container = "size-slider";
sizeSlider.viewModel.precision = 0;
sizeSlider.labelFormatFunction = function(value) {
return parseInt(value.toFixed(0)).toLocaleString();
};
function changeEventHandler() {
const layer = view.map.layers.getItemAt(0);
const renderer = layer.renderer.clone();
const colorVariable = getVisualVariableByType(renderer, "color");
const sizeVariable = getVisualVariableByType(renderer, "size");
renderer.visualVariables = [
colorVariable,
sizeSlider.updateVisualVariable(sizeVariable)
];
layer.renderer = renderer;
}
sizeSlider.on(
["thumb-change", "thumb-drag", "min-change", "max-change"],
changeEventHandler
);
}
function getVisualVariableByType(renderer, type) {
const visualVariables = renderer.visualVariables;
return (
visualVariables &&
visualVariables.filter(function(vv) {
return vv.type === type;
})[0]
);
}
function getTheme(renderer) {
const colorVVAuthInfo = renderer.authoringInfo.visualVariables.filter(
function(vv) {
return vv.type === "color";
}
)[0];
return colorVVAuthInfo.theme;
}
function getStatsFromVisualVariable(renderer, type) {
const visualVariable = getVisualVariableByType(renderer, type);
let avg, stddev;
if (type === "color") {
avg = visualVariable.stops[2].value;
stddev = visualVariable.stops[4].value - avg;
}
const visualVariableAuthInfo = renderer.authoringInfo.visualVariables.filter(
function(vv) {
return vv.type === type;
}
)[0];
const stats = {
avg: avg,
stddev: stddev,
min: visualVariableAuthInfo.minSliderValue,
max: visualVariableAuthInfo.maxSliderValue
};
return stats;
}
function getHistogramForVisualVariable(visualVariable) {
const params = {
layer: view.map.layers.getItemAt(0),
field: visualVariable.field,
normalizationField: visualVariable.normalizationField,
numBins: 30
};
return histogram(params);
}
function getStatsForVisualVariable(visualVariable) {
const params = {
layer: view.map.layers.getItemAt(0),
field: visualVariable.field,
normalizationField: visualVariable.normalizationField
};
return summaryStatistics(params);
}
});
</script>
</head>
<body>
<div id="viewDiv"></div>
<div id="color-container" class="widget-background">
<h3>% of truck traffic per day</h3>
<div id="color-slider"></div>
</div>
<div id="size-container" class="widget-background">
<h3>Daily traffic volume</h3>
<div id="size-slider"></div>
</div>
</body>
</html>