FlexPie 101

This page shows how to get started with Wijmo's FlexPie control.

Getting Started

Steps for getting started with the FlexPie control in AngularJS applications:

  1. Add references to AngularJS, Wijmo, and Wijmo's AngularJS directives.
  2. Include the Wijmo directives in the app module:
    var app = angular.module('app', ['wj']);
  3. Add a controller to provide data and logic.
  4. Add a Wijmo FlexPie control to the page and bind it to your data.
  5. (Optional) Add some CSS to customize the input control's appearance.
<!DOCTYPE html> <html> <head> <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/> <link rel="stylesheet" type="text/css" href="css/wijmo.css" /> <link href="css/app.css" rel="stylesheet" type="text/css" /> <script src="scripts/angular.js" type="text/javascript"></script> <script src="scripts/wijmo.js" type="text/javascript"></script> <script src="scripts/wijmo.chart.js" type="text/javascript"></script> <script src="scripts/wijmo.angular.js" type="text/javascript"></script> <script src="scripts/app.js" type="text/javascript"></script> </head> <body ng-app="app" ng-controller="appCtrl"> <!-- this is the FlexPie directive --> <wj-flex-pie items-source="itemsSource" binding="value" binding-name="name"> </wj-flex-pie> </body> </html>
// declare app module var app = angular.module('app', ['wj']); // controller provides data app.controller('simpleCtrl', function appCtrl($scope) { var names = ['Oranges', 'Apples', 'Pears', 'Bananas', 'Pineapples'], data = []; // populate itemsSource for (var i = 0; i < names.length; i++) { data.push({ name: names[i], value: Math.round(Math.random() * 100) }); } $scope.itemsSource = data; });

Result (live):

Basic Features

The FlexPie control has five basic properties that allow you to customize its layout and appearance:

The example below allows you to see what happens when you change these properties. Also, clicking on a pie slice will display a tooltip for the data point.

<wj-flex-pie control="chart" items-source="itemsSource" binding="value" binding-name="name" inner-radius="{​{ innerRadius }}" offset="{​{ offset }}" start-angle="{​{ startAngle }}" reversed="{​{ reversed }}"> </wj-flex-pie> <div class="form-horizontal"> <div class="form-group"> <label class="col-md-3 control-label">Inner Radius</label> <div class="col-md-9"> <wj-input-number control="inputInnerRadius" value="ctx.innerRadius" min="0" max="1" step=".1" format="n"> </wj-input-number> </div> </div> <div class="form-group"> <label class="col-md-3 control-label">Offset</label> <div class="col-md-9"> <wj-input-number control="inputOffset" value="ctx.offset" min="0" max="1" step=".1" format="n"> </wj-input-number> </div> </div> <div class="form-group"> <label class="col-md-3 control-label">Start Angle</label> <div class="col-md-9"> <wj-input-number control="inputStartAngle" value="ctx.startAngle" min="-360" max="360" step="45"> </wj-input-number> </div> </div> <div class="form-group"> <div class="col-md-offset-3 col-md-9"> <wj-menu header="Palette: <b>{​{ palette }}</b>" items-source="palettes" item-clicked="paletteChanged(s, e)"> </wj-menu> </div> </div> <div class="form-group"> <div class="col-md-offset-3 col-md-9"> <div class="checkbox"> <label> <input type="checkbox" ng-model="reversed"> Reversed? </label> </div> </div> </div> </div>
$scope.itemsSource = dataSvc.getData(); $scope.chart = null; $scope.inputInnerRadius = null; $scope.inputOffset = null; $scope.inputStartAngle = null; $scope.innerRadius = 0; $scope.offset = 0; $scope.startAngle = 0; $scope.reversed = false; $scope.palette = 'standard'; $scope.palettes = ['standard', 'cocoa', 'coral', 'dark', 'highcontrast', 'light', 'midnight', 'minimal', 'modern', 'organic', 'slate']; $scope.ctx = { innerRadius: 0, offset: 0, startAngle: 0 }; $scope.$watch('ctx.innerRadius', function () { var innerRadius = $scope.inputInnerRadius, val = $scope.ctx.innerRadius; if (innerRadius != null) { if (val < innerRadius.min || val > innerRadius.max) { return; } $scope.innerRadius = val; } }); $scope.$watch('ctx.offset', function () { var offset = $scope.inputOffset, val = $scope.ctx.offset; if (offset != null) { if (val < offset.min || val > offset.max) { return; } $scope.offset = val; } }); $scope.$watch('ctx.startAngle', function () { var startAngle = $scope.inputStartAngle, val = $scope.ctx.startAngle; if (startAngle != null) { if (val < startAngle.min || val > startAngle.max) { return; } $scope.startAngle = val; } }); $scope.paletteChanged = function (sender) { var p = $scope.palettes[sender.selectedIndex]; $scope.palette = p; $scope.chart.palette = wijmo.chart.Palettes[p]; };

Result (live):

Legend and Titles

The legend properties can be used to customize the appearance of the chart's legend. The header and footer properties can be used to add titles to the FlexPie control as well.

The following example allows you to change the FlexPie's legend.position, header, and footer properties in real-time.

<wj-flex-pie items-source="itemsSource" binding="value" binding-name="name" header="{​{ header }}" footer="{​{ footer }}"> <wj-flex-chart-legend position="{​{ legendPosition }}"></wj-flex-chart-legend> </wj-flex-pie> <div class="form-horizontal"> <div class="form-group"> <label class="col-md-3 control-label">Header</label> <div class="col-md-9"> <input type="text" class="form-control" ng-model="header" placeholder="Specify the FlexPie's header" /> </div> </div> <div class="form-group"> <label class="col-md-3 control-label">Footer</label> <div class="col-md-9"> <input type="text" class="form-control" ng-model="footer" placeholder="Specify the FlexPie's footer" /> </div> </div> <div class="form-group"> <div class="col-md-offset-3 col-md-9"> <wj-menu header="Legend Position" value="legendPosition"> <wj-menu-item value="'None'">None</wj-menu-item> <wj-menu-item value="'Left'">Left</wj-menu-item> <wj-menu-item value="'Top'">Top</wj-menu-item> <wj-menu-item value="'Right'">Right</wj-menu-item> <wj-menu-item value="'Bottom'">Bottom</wj-menu-item> </wj-menu> </div> </div> </div>
$scope.itemsSource = dataSvc.getData(); $scope.header = 'Fruit By Value'; $scope.footer = '2014 GrapeCity, inc.'; $scope.legendPosition = 'Right';

Result (live):

None Left Top Right Bottom


The FlexPie control allows you to select data points by clicking or touching a pie slice. Use the selectionMode property to specify whether you want to allow selection by data point or no selection at all (default).

Setting the selctionMode property to Point causes the FlexPie to update the selection property when the user clicks on a pie slice, and to apply the "wj-state-selected" class to the selected element. Setting the FlexPie's selectionMode property to Series or None will disable selections within the control.

The FlexPie offers three additional properties to customize the selection:

<wj-flex-pie items-source="itemsSource" binding="value" binding-name="name" selection-mode="Point" selected-item-position="{​{ selectedPosition }}" selected-item-offset="{​{ selectedOffset }}" is-animated="{​{ isAnimated }}"> </wj-flex-pie> <div class="form-horizontal"> <div class="form-group"> <label class="col-md-3 control-label">Selected Item Offset</label> <div class="col-md-9"> <wj-input-number control="inputSelectedOffset" value="ctx.selectedOffset" min="0" max=".5" step=".1" format="n"> </wj-input-number> </div> </div> <div class="form-group"> <div class="col-md-offset-3 col-md-9"> <wj-menu header="Selected Item Position" value="selectedPosition"> <wj-menu-item value="'None'">None</wj-menu-item> <wj-menu-item value="'Left'">Left</wj-menu-item> <wj-menu-item value="'Top'">Top</wj-menu-item> <wj-menu-item value="'Right'">Right</wj-menu-item> <wj-menu-item value="'Bottom'">Bottom</wj-menu-item> </wj-menu> </div> </div> <div class="form-group"> <div class="col-md-offset-3 col-md-9"> <div class="checkbox"> <label> <input type="checkbox" ng-model="isAnimated"> Is Animated? </label> </div> </div> </div> </div>
$scope.itemsSource = dataSvc.getData(); $scope.selectedPosition = 'Top'; $scope.selectedOffset = 0; $scope.isAnimated = true; $scope.inputSelectedOffset = null; $scope.ctx = { selectedOffset: 0}; $scope.$watch('ctx.selectedOffset', function () { var selectedOffset = $scope.inputSelectedOffset, val = $scope.ctx.selectedOffset; if (selectedOffset != null) { if (val < selectedOffset.min || val > selectedOffset.max) { return; } $scope.selectedOffset = val; } });

Result (live):

None Left Top Right Bottom


The appearance of the FlexPie control is largely defined in CSS. In addition to the default theme, we include several professionally designed themes that customize the appearance of all Wijmo controls to achieve a consistent, attractive look.

You can customize the appearance of the FlexPie control using CSS. To do this, copy the CSS rules from the default theme to a new CSS file and modify the properties as needed.

In this example, we added the "custom-pie-chart" CSS class to the control and defined some CSS rules to change the fill, font family, and font weight of the header, footer, and legend.

<wj-flex-pie items-source="itemsSource" binding="value" binding-name="name" header="Header" footer="Footer" class="custom-pie-chart"> </wj-flex-pie>
$scope.itemsSource = dataSvc.getData();
.custom-pie-chart.wj-flexchart .wj-header .wj-title, .custom-pie-chart.wj-flexchart .wj-footer .wj-title, .custom-pie-chart.wj-flexchart .wj-legend > .wj-label { fill: #666; font-family: 'Courier New', Courier, monospace; font-weight: bold; }

Result (live):