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Vector Map - Area with Labels and Two Legends
The VectorMap component allows you to use color and size indicators to better illustrate the values associated with areas/markers. Use map legends to provide additional information on colors and marker size.
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Backend API
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@(Html.DevExtreme().VectorMap()
.ID("vector-map")
.Layers(layers => {
layers.Add()
.Name("areas")
.DataSource(new JS("DevExpress.viz.map.sources.world"))
.Palette(VizPalette.Violet)
.ColorGroups(new double[] { 0, 0.5, 0.8, 1, 2, 3, 100 })
.ColorGroupingField("population")
.Label(lab => lab
.Enabled(true)
.DataField("name")
)
.Customize("vectormMap_areasLayer_customize");
layers.Add()
.Name("markers")
.DataSource(d => d.StaticJson().Url(Url.Action("GetAreaWithLabelsAndTwoLegendsData")))
.DataSourceOptions(dso => dso.Map("vectormMap_markersLayer_dataSource_map"))
.ElementType(VectorMapMarkerType.Bubble)
.DataField("value")
.SizeGroups(new double[] { 0, 8000, 10000, 50000 })
.Opacity(0.8)
.Label(l => l.Enabled(false));
})
.Tooltip(t => t
.Enabled(true)
.CustomizeTooltip("vectorMap_customizeTooltip")
)
.Legends(legends => {
legends.Add()
.Title("World Population\nPercentages")
.Source(s => s
.Layer("areas")
.Grouping("color")
)
.HorizontalAlignment(HorizontalAlignment.Left)
.VerticalAlignment(VerticalEdge.Bottom)
.CustomizeText("vectorMap_areasLegend_customizeText")
.CustomizeItems("vectorMap_customizeItems");
legends.Add()
.Title("City Population")
.Source(s => s
.Layer("markers")
.Grouping("size")
)
.MarkerShape(VectorMapMarkerShape.Circle)
.HorizontalAlignment(HorizontalAlignment.Right)
.VerticalAlignment(VerticalEdge.Bottom)
.CustomizeText("vectorMap_markersLegend_customizeText")
.CustomizeItems("vectorMap_customizeItems");
})
.Bounds(new double[] { -180, 85, 180, -75 })
)
<script src="~/Scripts/data/areaPopulations.js"></script>
<script>
function vectormMap_markersLayer_dataSource_map(item) {
item.features = $.map(item.features,
function(data) {
return {
type: "Feature",
geometry: {
type: "Point",
coordinates: data.coordinates
},
properties: {
value: data.value,
text: data.text
}
};
}
);
return item;
}
function vectormMap_areasLayer_customize(elements) {
$.each(elements, function(_, element) {
var name = element.attribute("name"),
population = areaPopulations[name];
if(population) {
element.attribute("population", population);
}
});
}
function vectorMap_customizeTooltip(arg) {
return { text: arg.attribute("text") };
}
function vectorMap_areasLegend_customizeText(arg) {
if(arg.index === 0) {
return "< 0.5%";
}
else if(arg.index === 5) {
return "> 3%";
}
else {
return arg.start + "% to " + arg.end + "%";
}
}
function vectorMap_markersLegend_customizeText(arg) {
return ["< 8000K", "8000K to 10000K", "> 10000K"][arg.index];
}
function vectorMap_customizeItems(items) {
return items.reverse();
}
</script>
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