Tiling Algorithms
Documentation
The TreeMap component supports three layout algorithms out of the box and provides the capability to implement your own algorithm. In this demo, you can change the applied algorithm at runtime using the drop-down menu above the component.
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<dx-tree-map
id="treemap"
[dataSource]="getPopulationsByAge"
title="Population by Age Groups"
[layoutAlgorithm]="selectbox.value === 'custom' ? customAlgorithm : selectbox.value">
<dxo-colorizer
type="discrete"
[colorizeGroups]="true"></dxo-colorizer>
<dxo-tooltip
[enabled]="true"
format="thousands"
[customizeTooltip]="customizeTooltip"></dxo-tooltip>
</dx-tree-map>
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Tiling Algorithm</span>
<dx-select-box
#selectbox
[items]="algorithms"
[width]="200"
[value]="algorithms[2]">
</dx-select-box>
</div>
</div>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxTreeMapModule, DxSelectBoxModule } from 'devextreme-angular';
import { PopulationByAge, Service } from './app.service';
if(!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
providers: [Service],
preserveWhitespaces: true
})
export class AppComponent {
getPopulationsByAge: PopulationByAge[];
algorithms = ["sliceAndDice", "squarified", "strip", "custom"];
constructor(service: Service) {
this.getPopulationsByAge = service.getPopulationsByAge();
}
customizeTooltip(arg) {
var data = arg.node.data,
parentData = arg.node.getParent().data,
result = "";
if (arg.node.isLeaf()) {
result = "<span class='country'>" + parentData.name + "</span><br />" +
data.name + "<br />" + arg.valueText + " (" +
(100 * data.value/parentData.total).toFixed(1) + "%)";
} else {
result = "<span class='country'>" + data.name + "</span>";
}
return {
text: result
};
}
customAlgorithm(arg) {
var side = 0,
totalRect = arg.rect.slice(),
totalSum = arg.sum;
arg.items.forEach(function (item) {
var size = Math.round((totalRect[side + 2] -
totalRect[side]) * item.value / totalSum),
pos,
rect = totalRect.slice();
totalSum -= item.value;
rect[side + 2] = totalRect[side] = totalRect[side] + size;
item.rect = rect;
side = 1 - side;
});
}
}
@NgModule({
imports: [
BrowserModule,
DxTreeMapModule,
DxSelectBoxModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #treemap {
height: 460px;
}
::ng-deep .country {
font-weight: 500;
}
::ng-deep .options {
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
margin-top: 20px;
}
::ng-deep .option {
margin-top: 10px;
}
::ng-deep .caption {
font-size: 18px;
font-weight: 500;
}
::ng-deep .option > span {
margin-right: 10px;
}
::ng-deep .option > .dx-widget {
display: inline-block;
vertical-align: middle;
}
import { Injectable } from '@angular/core';
export interface PopulationByAge {
name: string;
total: number;
items: any[];
}
let populationsByAge: PopulationByAge[] = [{
"name": "Brazil",
"total": 200050486,
"items": [{
"name": "Age 0-14",
"value": 48058462
}, {
"name": "Age 15-44",
"value": 96036995
}, {
"name": "Age 45-64",
"value": 40715296
}, {
"name": "Age 65+",
"value": 15239733
}]
}, {
"name": "Japan",
"total": 126345237,
"items": [{
"name": "Age 0-14",
"value": 16593766
}, {
"name": "Age 15-44",
"value": 45455276
}, {
"name": "Age 45-64",
"value": 32845790
}, {
"name": "Age 65+",
"value": 31450405
}]
}, {
"name": "United States",
"total": 318497627,
"items": [{
"name": "Age 0-14",
"value": 63968935
}, {
"name": "Age 15-44",
"value": 127217843
}, {
"name": "Age 45-64",
"value": 83145484
}, {
"name": "Age 65+",
"value": 44165365
}]
}];
@Injectable()
export class Service {
getPopulationsByAge() {
return populationsByAge;
}
}
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