JavaScript/jQuery PolarChart Options

See Also

• Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout

The adaptive layout enables the UI component to hide optional elements if they do not fit in the container. Elements are hidden in the following sequence:

1. Title
2. Export menu icon
3. Legend
4. Argument axis labels
5. Point labels (can be saved by setting the adaptiveLayout.keepLabels property to true)

Use the height and width properties in the adaptiveLayout object to specify the minimum container size at which the layout begins to adapt.

View Demo on JSFiddle

The UI component animates its elements at the beginning of its lifetime and when the data source changes.

$(function() {
    $("#polarChartContainer").dxPolarChart({
        // ...
        animation: {
            easing: "linear",
            duration: 500,
            maxPointCountSupported: 100
        }
    });
});

<dx-polar-chart ... >
    <dxo-animation
        easing="linear"
        [duration]="500"
        [maxPointCountSupported]="100">
    </dxo-animation>
</dx-polar-chart>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    // ...
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxPolarChartModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxPolarChartModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

<template>
    <DxPolarChart ... >
        <DxAnimation
            easing="linear"
            :duration="500"
            :max-point-count-supported="100"
        />
    </DxPolarChart>
</template>

<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import DxPolarChart, {
    DxAnimation
} from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart,
        DxAnimation
    },
    // ...
}
</script>

import React from 'react';

import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import PolarChart, {
    Animation 
} from 'devextreme-react/polar-chart';

class App extends React.Component {
    render() {
        return (
            <PolarChart ... >
                <Animation
                    easing="linear"
                    duration={500}
                    maxPointCountSupported={100}
                />
            </PolarChart>
        );
    }
}
export default App;

Annotations are containers for images, text blocks, and custom content that display additional information about the visualized data.

To create annotations, assign an array of objects to the annotations[] property. Each object configures an individual annotation. You can set each annotation's type property to "text", "image", or "custom". Depending on the type, specify the annotation's text, image, or template property:

$(function() {
    $("#polarChart").dxPolarChart({
        annotations: [{
            type: "text",
            text: "Annotation text"
        }, {
            type: "image",
            image: "http://image/url/myimage.png"
        }, {
            type: "custom",
            template: function(annotation) {
                const data = annotation.data;
                const $svg = $("<svg>");
                // ...
                // Customize the annotation's markup here
                // ...
                return $svg;
            }
        }]
    });
});

<dx-polar-chart ... >
    <dxi-annotation
        type="text"
        text="Annotation text">
    </dxi-annotation>
    <dxi-annotation
        type="image"
        image="http://image/url/myimage.png">
    </dxi-annotation>
    <dxi-annotation
        type="custom"
        template="custom-annotation">
    </dxi-annotation>
    <svg *dxTemplate="let annotation of 'custom-annotation'">
        <!-- Declare custom SVG markup here -->
    </svg>
</dx-polar-chart>

import { Component } from '@angular/core';
@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    // ...
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxPolarChartModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxPolarChartModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

<template>
    <DxPolarChart ... >
        <DxAnnotation
            type="text"
            text="Annotation text"
        />
        <DxAnnotation
            type="image"
            image="http://image/url/myimage.png"
        />
        <DxAnnotation
            type="custom"
            template="custom-annotation"
        />
        <template #custom-annotation="{ data }">
            <svg>
                <!-- Declare custom SVG markup here -->
            </svg>
        </template>
    </DxPolarChart>
</template>

<script>
import DxPolarChart, {
    DxAnnotation
} from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart,
        DxAnnotation
    },
    data() {
        // ...
    }
}
</script>

import React from 'react';

import PolarChart, {
    Annotation
} from 'devextreme-react/polar-chart';

function CustomAnnotation(annotation) {
    const data = annotation.data;
    return (
        <svg>
            {/* Declare custom SVG markup here */}
        </svg>
    );
}

export default function App() {
    return (
        <PolarChart ... >
            <Annotation
                type="text"
                text="Annotation text"
            />
            <Annotation
                type="image"
                image="http://image/url/myimage.png"
            />
            <Annotation
                type="custom"
                render={CustomAnnotation}
            />
        </PolarChart>
    );
}

Annotations can be anchored to a PolarChart element. The following list shows how to position them. Chart coordinates (argument, value and series properties) specify the element that the annotation's arrow points to; pixel coordinates (x and y) specify the position of the annotation's center. You can also use polar coordinate system (angle and radius properties) to create unanchored annotations.

• Unanchored annotation

  annotations: [{
      x: 100,
      y: 200
  }, {
      angle: 45,
      radius: 100
  }]

• Annotation anchored to a polar chart coordinate

  annotations: [{
      argument: new Date(2019, 1, 16),
      value: 15
  }]

• Annotation anchored to a series point

  annotations: [{
      argument: new Date(2019, 1, 16),
      series: "Series 1"
  }]

• Annotation displayed on an axis

  annotations: [{ 
      // An annotation on the argument axis 
      argument: new Date(2019, 1, 16)
  }, { 
      // An annotation on the value axis 
      value: 15
  }]

• Mixed anchoring (pixel and chart coordinates used simultaneously)

  annotations: [{
      argument: new Date(2019, 1, 16),
      y: 200
  }]

When a user long-presses an annotation or hovers the mouse pointer over it, the PolarChart displays a tooltip.

Objects in the annotations[] array configure individual annotations. To specify properties common for all annotations, use the commonAnnotationSettings object. Individual settings take precedence over common settings.

View Demo

See Also

• customizeAnnotation

For charting, the polar coordinate system is used to determine each point uniquely on a plane through two numbers, the argument and the value of the point. A circular and straight lines (the axis of arguments and the axis of values) are specified to define the coordinates. To define the argument axis, use the argumentAxis configuration object. To define the value axis, use the valueAxis configuration object. To set the properties of all axes to a common value, use the commonAxisSettings configuration object. This object exposes the properties that can be specified for all axes simultaneously. Note that the value specified for an axis individually (in the argumentAxis or valueAxis object) overrides the value specified in the commonAxisSettings object.

This property accepts a value from 0 to 1 that specifies the correlation between the empty space on a bar group's sides and the group's angular width: 0 - the bar group occupies the whole allocated sector; 1 - virtually hides the bar group leaving the whole sector empty.

See Also

• Specify the Bar Width
• barPadding

A bar's maximum width is limited. In single-series charts, it cannot be greater than the interval between two major ticks. In multi-series charts, it depends on the number of bars in the parent group and this group's actual width. See the Specify the Bar Width article for more information.

See Also

• barWidth

Settings specified here can be ignored in favor of individual annotation settings specified in the annotations[] array. Refer to the array's description for information on how to configure annotations.

The following code shows the commonAnnotationSettings declaration syntax:

$(function() {
    $("#polarChart").dxPolarChart({
        // ...
        commonAnnotationSettings: {
            tooltipEnabled: false
        }
    });
});

<dx-polar-chart ... >
    <dx-common-annotation-settings
        [tooltipEnabled]="false">
    </dx-common-annotation-settings>
</dx-polar-chart>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    // ...
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxPolarChartModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxPolarChartModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

<template>
    <DxPolarChart ... >
        <DxCommonAnnotationSettings
            :tooltip-enabled="false"
        />
    </DxPolarChart>
</template>

<script>
import DxPolarChart, {
    DxCommonAnnotationSettings
} from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart,
        DxCommonAnnotationSettings
    },
    data() {
        // ...
    }
}
</script>

import React from 'react';

import PolarChart, {
    CommonAnnotationSettings
} from 'devextreme-react/polar-chart';

class App extends React.Component {
    render() {
        return (
            <PolarChart ... >
                <CommonAnnotationSettings
                    tooltipEnabled={false}
                />
            </PolarChart>
        );
    }
}
export default App;

View Demo

See Also

• customizeAnnotation

Use this object's properties to set the properties for all chart axes at once. The property values will be applied to the argument axis and all values axes, which are defined in the valueAxis array. To set a common axis property for an axis individually, use the corresponding valueAxis or argumentAxis object. Values that are set individually override their corresponding common values.

Use this object's properties to set properties for all chart series at once. These can be properties common to all series types and properties specific to series types.

If you have several series of one type, you can set properties to the values specific to this series type using the corresponding object (area, line or another) within the commonSeriesSettings configuration object. The values that are set within type-specific configuration objects override the corresponding common values.

In case you have to set a property for an individual series, use the corresponding series object within the series array. The values that are set individually override the corresponding common values.

If you set this property to the color of the parent page element, certain chart elements will use this color to coordinate with the page. For example, hovered points in the PolarChart UI component are painted in the color that is set to this property, but you can change this color to a custom color (see color).

The following code shows how to use the customizeAnnotation function to apply different settings to text and image annotations:

$(function() {
    $("#polarChart").dxPolarChart({
        // ...
        customizeAnnotation: function(annotationItem) {
            if(annotationItem.text) {
                annotationItem.color = "red";
            }
            if(annotationItem.image) {
                annotationItem.color = "blue";
            }
            return annotationItem;
        }
    });
});

<dx-polar-chart ...
    [customizeAnnotation]="customizeAnnotation">
</dx-polar-chart>

// ...
export class AppComponent {
    customizeAnnotation(annotationItem) {
        if(annotationItem.text) {
            annotationItem.color = "red";
        }
        if(annotationItem.image) {
            annotationItem.color = "blue";
        }
        return annotationItem;
    }
}

import { DxPolarChartModule } from 'devextreme-angular';
// ...
@NgModule({
    imports: [
        // ...
        DxPolarChartModule
    ],
    // ...
})
export class AppModule { }

<template> 
    <DxPolarChart ...
        :customize-annotation="customizeAnnotation">
    </DxPolarChart>
</template>

<script>
import DxPolarChart from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart
    },
    methods: {
        customizeAnnotation(annotationItem) {
            if(annotationItem.text) {
                annotationItem.color = "red";
            }
            if(annotationItem.image) {
                annotationItem.color = "blue";
            }
            return annotationItem;
        }
    }
}
</script>

import React from 'react';
import PolarChart from 'devextreme-react/polar-chart';

class App extends React.Component {
    render() {
        return (
            <PolarChart ...
                customizeAnnotation={this.customizeAnnotation}>
            </PolarChart>
        );
    }

    customizeAnnotation(annotationItem) {
        if(annotationItem.text) {
            annotationItem.color = "red";
        }
        if(annotationItem.image) {
            annotationItem.color = "blue";
        }
        return annotationItem;
    }
}

export default App;

@(Html.DevExtreme().PolarChart()
    @* ... *@
    .CustomizeAnnotation("customizeAnnotation")
)

<script type="text/javascript">
    function customizeAnnotation(annotationItem) {
        if(annotationItem.text) {
            annotationItem.color = "red";
        }
        if(annotationItem.image) {
            annotationItem.color = "blue";
        }
        return annotationItem;
    }
</script>

See Also

• annotations[]
• commonAnnotationSettings

All point labels in a chart are identical by default, but you can specify a unique appearance for individual labels using the customizeLabel function. This function should return an object with properties that will be changed for a certain label. See the label object for information about all properties available for changing.

The customizeLabel function accepts an object providing information about the series point that the label belongs to. This object contains the following fields.

By default, all series points in a chart are identical, but you can specify a unique appearance for individual points using the customizePoint function. This function should return an object with properties that will be changed for a certain point. See the point object for information about all properties available for changing.

The customizePoint function accepts an object providing information about the series point. This object contains the following fields.

When values from a data source are of a different type, they may be displayed incorrectly on a chart. To resolve this situation, use the properties provided by the dataPrepareSettings configuration object. You can enable/disable data validation using the checkTypeForAllData property, or specify whether or not to convert the data source values to the type of the axis using the convertToAxisDataType property. In addition, you can sort the series points using the sortingMethod property.

The PolarChart works with collections of objects.

Depending on your data source, bind the PolarChart to data as follows.

• Data Array
  Assign the array to the dataSource option. View Demo

• Read-Only Data in JSON Format
  Set the dataSource property to the URL of a JSON file or service that returns JSON data. View Demo

• OData
  Implement an ODataStore.

• Web API, PHP, MongoDB
  Use one of the following extensions to enable the server to process data according to the protocol DevExtreme UI components use:

  • DevExtreme.AspNet.Data
  • DevExtreme-PHP-Data
  • devextreme-query-mongodb

  Then, use the createStore method to configure access to the server on the client as shown below. This method is part of DevExtreme.AspNet.Data.

  jQuery

  JavaScript

  $(function() {
      let serviceUrl = "https://url/to/my/service";
      $("#polarChartContainer").dxPolarChart({
          // ...
          dataSource: DevExpress.data.AspNet.createStore({
              key: "ID",
              loadUrl: serviceUrl + "/GetAction",
              insertUrl: serviceUrl + "/InsertAction",
              updateUrl: serviceUrl + "/UpdateAction",
              deleteUrl: serviceUrl + "/DeleteAction"
          })
      })
  });

  Angular

  app.component.ts

  app.component.html

  app.module.ts

  import { Component } from '@angular/core';
  import CustomStore from 'devextreme/data/custom_store';
  import { createStore } from 'devextreme-aspnet-data-nojquery';
  
  @Component({
      selector: 'app-root',
      templateUrl: './app.component.html',
      styleUrls: ['./app.component.css']
  })
  export class AppComponent {
      store: CustomStore;
      constructor() {
          let serviceUrl = "https://url/to/my/service";
          this.store = createStore({
              key: "ID",
              loadUrl: serviceUrl + "/GetAction",
              insertUrl: serviceUrl + "/InsertAction",
              updateUrl: serviceUrl + "/UpdateAction",
              deleteUrl: serviceUrl + "/DeleteAction"
          })
      }
  }

  <dx-polar-chart ...
      [dataSource]="store">
  </dx-polar-chart>

  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { AppComponent } from './app.component';
  
  import { DxPolarChartModule } from 'devextreme-angular';
  
  @NgModule({
      declarations: [
          AppComponent
      ],
      imports: [
          BrowserModule,
          DxPolarChartModule
      ],
      providers: [],
      bootstrap: [AppComponent]
  })
  export class AppModule { }

  Vue

  App.vue

  <template> 
      <DxPolarChart ...
          :data-source="store" />
  </template>
  
  <script>
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import CustomStore from 'devextreme/data/custom_store';
  import { createStore } from 'devextreme-aspnet-data-nojquery';
  import { DxPolarChart } from 'devextreme-vue/polar-chart';
  
  export default {
      components: {
          DxPolarChart
      },
      data() {
          const serviceUrl = "https://url/to/my/service";
          const store = createStore({
              key: "ID",
              loadUrl: serviceUrl + "/GetAction",
              insertUrl: serviceUrl + "/InsertAction",
              updateUrl: serviceUrl + "/UpdateAction",
              deleteUrl: serviceUrl + "/DeleteAction"
          });
          return {
              store
          }
      }
  }
  </script>

  React

  App.js

  import React from 'react';
  import 'devextreme/dist/css/dx.common.css';
  import 'devextreme/dist/css/dx.light.css';
  
  import CustomStore from 'devextreme/data/custom_store';
  import { createStore } from 'devextreme-aspnet-data-nojquery';
  import PolarChart from 'devextreme-react/polar-chart';
  
  const serviceUrl = "https://url/to/my/service";
  const store = createStore({
      key: "ID",
      loadUrl: serviceUrl + "/GetAction",
      insertUrl: serviceUrl + "/InsertAction",
      updateUrl: serviceUrl + "/UpdateAction",
      deleteUrl: serviceUrl + "/DeleteAction"
  });
  
  class App extends React.Component {
      render() {
          return (
              <PolarChart ...
                  dataSource={store} />
          );
      }
  }
  export default App;

• Any other data source
  Implement a CustomStore.

Regardless of the data source on the input, the PolarChart always wraps it in the DataSource object. This object allows you to sort, filter, group, and perform other data shaping operations. To get its instance, call the getDataSource() method.

After providing data, bind series to it.

These features allow a user to export your UI component into a document or print it. When exporting is enabled, the "Exporting/Printing" button appears in the UI component. A click on it invokes a drop-down menu that lists exporting and printing commands. The following formats are supported for exporting into: PNG, PDF, JPEG, SVG and GIF.

See Also

• exportTo(fileName, format)
• print()
• DevExpress.viz.exportWidgets(widgetInstances, options)

The PolarChart UI component can include a legend - an explanatory component that helps you identify a series. Each series is represented by an item on a Legend. An item marker identifies the series color. An item label displays the series title. To set the required position for a legend and its items, to customize the font settings for item labels, and to specify the size of item markers, use the properties of the legend configuration object. To learn more on the legend and its properties, refer to the Legend topic.

When the UI component is bound to a remote data source, it can display a loading indicator while data is loading.

To enable the automatic loading indicator, set the enabled property to true.

If you want to change the loading indicator's visibility, use the show property or the showLoadingIndicator() and hideLoadingIndicator() methods.

Oftentimes, series data contains negative values. Visualizing such data using stacked-like series may lead to unexpected results. To prevent situations of this kind, assign true to the negativesAsZeroes property, and the UI component will count all negative values as zeroes.

See Also

• getAllSeries()
• getSeriesByName(seriesName)
• getSeriesByPos(seriesIndex)

See Also

• onExporting
• onFileSaving

See Also

• onExported
• onFileSaving

See Also

• onExporting
• onExported

The UI component notifies you of errors and warnings by passing messages to the browser console. Each message contains the incident's ID, a brief description, and a link to the Errors and Warnings section where further information about this incident can be found.

The onIncidentOccurred function allows you to handle errors and warnings the way you require. The object passed to it contains the target field. This field provides information about the occurred incident and contains the following properties:

• id
  The incident's ID. The full list of IDs can be found in the Errors and Warnings section.
• type
  The incident's type: "error" or "warning".
• args
  The argument of the incident's message. Depends on the incident. For example, it may be the name of the data source field that was specified incorrectly, or the name of the property that was not set properly.
• text
  The text passed to the browser's console. Includes the args content, if there is any.
• widget
  The name of the UI component that produced the error or warning.
• version
  The used DevExtreme version.

See Also

• Get a UI component Instance in Angular | AngularJS | Knockout | Vue | React

The following example shows how to subscribe to component property changes:

$(function() {
    $("#polarChartContainer").dxPolarChart({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});

<dx-polar-chart ...
    (onOptionChanged)="handlePropertyChange($event)"> 
</dx-polar-chart>

import { Component } from '@angular/core'; 

@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.css'] 
}) 

export class AppComponent { 
    // ...
    handlePropertyChange(e) {
        if(e.name === "changedProperty") { 
            // handle the property change here
        }
    }
}

import { BrowserModule } from '@angular/platform-browser'; 
import { NgModule } from '@angular/core'; 
import { AppComponent } from './app.component'; 
import { DxPolarChartModule } from 'devextreme-angular'; 

@NgModule({ 
    declarations: [ 
        AppComponent 
    ], 
    imports: [ 
        BrowserModule, 
        DxPolarChartModule 
    ], 
    providers: [ ], 
    bootstrap: [AppComponent] 
}) 

export class AppModule { }  

<template> 
    <DxPolarChart ...
        @option-changed="handlePropertyChange"
    />            
</template> 

<script> 
import 'devextreme/dist/css/dx.common.css'; 
import 'devextreme/dist/css/dx.light.css'; 
import DxPolarChart from 'devextreme-vue/polar-chart'; 

export default { 
    components: { 
        DxPolarChart
    }, 
    // ...
    methods: { 
        handlePropertyChange: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    } 
} 
</script> 

import React from 'react'; 
import 'devextreme/dist/css/dx.common.css'; 
import 'devextreme/dist/css/dx.light.css'; 

import PolarChart from 'devextreme-react/polar-chart'; 

const handlePropertyChange = (e) => {
    if(e.name === "changedProperty") {
        // handle the property change here
    }
}

export default function App() { 
    return ( 
        <PolarChart ...
            onOptionChanged={handlePropertyChange}
        />        
    ); 
} 

$(function () {
    $("#polarChartContainer").dxPolarChart({
        // ...
        onPointClick: function (e) {
            e.event.cancel = true;
        }
    });
});

import { DxPolarChartModule } from "devextreme-angular";
// ...
export class AppComponent {
    cancelSeriesClick (e) {
        e.event.cancel = true;
    }
}
@NgModule({
    imports: [
        // ...
        DxPolarChartModule
    ],
    // ...
})

<dx-polar-chart ...
    (onPointClick)="cancelSeriesClick($event)">
</dx-polar-chart>

<template>
    <DxPolarChart ...
        @point-click="cancelSeriesClick">
    </DxPolarChart>
</template>

<script>
import DxPolarChart from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart
    },
    methods: {
        cancelSeriesClick (e) {
            e.event.cancel = true;
        }
    }
}
</script>

import React from 'react';

import PolarChart from 'devextreme-react/polar-chart';

class App extends React.Component {
    render() {
        return (
            <PolarChart ...
                onPointClick={this.cancelSeriesClick}>
            </PolarChart>
        );
    }

    cancelSeriesClick (e) {
        e.event.cancel = true;
    }
}

export default App;

Bar Chart Demo

To identify whether the pointer has entered or left the series point, call the point's isHovered() method.

To identify whether the selection has been applied or canceled, call the point's isSelected() method.

To identify whether the pointer has entered or left the series, call the series' isHovered() method.

To identify whether the selection has been applied or canceled, call the series' isSelected() method.

See Also

• hideTooltip()
• Point.hideTooltip()

See Also

• Point.showTooltip()

See Also

• onZoomStart

See Also

• onZoomEnd

This property accepts either the name of a predefined palette or an array of colors. The array can include the following colors:

• Hexadecimal colors
• RGB colors
• RGBA colors
• Predefined/cross-browser color names
• Predefined SVG colors

See Also

• Palettes
• paletteExtensionMode
• DevExpress.viz.generateColors(palette, count, options)
• series.color

The following variants are available:

• "blend"
  Create a blend of two neighboring colors and insert it between these colors in the palette.

• "alternate"
  Repeat the full set of palette colors, alternating their normal, lightened, and darkened shades in that order.

• "extrapolate"
  Repeat the full set of palette colors, changing their shade gradually from dark to light.

View Demo

If you place the UI component on a page that uses a tag modifying the path (<base>, <iframe>, etc.), some of the UI component elements may get mixed up or disappear. To solve this problem, set the pathModified property to true.

See Also

• DevExpress.viz.refreshPaths()

To set the points to highlight along with the selected point, set the series.point.selectionMode property.

Multiple Point Selection Demo API - Select a Point Demo

When this property is set to true, the UI component will be redrawn automatically in case the size of its parent window changes.

Series point labels display series point values. If your chart contains several series with a large number of points in each, point labels may overlap. In this case, specify how the chart must resolve overlapping using the resolveLabelOverlapping property. To hide certain labels, set this property to 'hide'. Labels to be hidden will be determined automatically.

When this property is set to true, the UI component text flows from right to left, and the layout of elements is reversed. To switch the entire application/site to the right-to-left representation, assign true to the rtlEnabled field of the object passed to the DevExpress.config(config) method.

DevExpress.config({
    rtlEnabled: true
});

A series represents a grouping of related data points. The most important characteristic of a series is its type, which determines a particular visual representation of data. You can find more details on each series type in the corresponding topics in the Series help section.

To define a single series, assign an object defining the series to the series configuration object. In the series' object, specify the series type, data source fields, the appearance of the series points and other properties.

To show several series, specify series as an array of objects defining series. If you need to set similar values to properties of several series, use the commonSeriesSettings configuration object. It exposes the properties that can be specified for all series at once and for all series of a particular type at once. Note that the values specified for a series individually (in the series array) override the values that are specified for all series (in the commonSeriesSettings object).

To set the series elements to highlight when a series is selected, set the series selectionMode property.

In most cases, you can organize the array that is assigned to the chart's dataSource property in the following way.

[
    {arg: arg1Value, series1Value: val11, series2Value: val12, ...}
    {arg: arg2Value, series1Value: val21, series2Value: val22, ...}
    ...
    {arg: argNValue, series1Value: valN1, series2Value: valN2, ...}
]

Each object that is included in the array represents an argument value and the values of all series for this argument.

However, there are some scenarios in which you do not know exactly how many series will be added. In these cases, you will not be able to define the data source in the manner detailed above. Instead, define it in the following way.

[
    {seriesName: series1, arg: arg11Value, val: value11 }
    {seriesName: series1, arg: arg12Value, val: value12 }
    ...
    {seriesName: seriesM, arg: argM1Value, val: valueM1 }
    {seriesName: seriesM, arg: argM2Value, val: valueM2 }
    ...
]

If you define a data source in this manner, set the argument and value fields using the argumentField and valueField properties of the commonSeriesSettings configuration object (for all series at once). Then, define a template for the series using the seriesTemplate configuration object. Within this object, set the data source field that specifies the series name to the nameField property.

If you need to specify individual values for properties of a particular series, assign a callback function to the customizeSeries property of the seriesTemplate object.

The UI component occupies its container's entire area by default. Use the size object to specify the UI component's size if it should be different from that of its container. Assign 0 to size object's height and width properties to hide the UI component.

$(function() {
    $("#polarChartContainer").dxPolarChart({
        // ...
        size: {
            height: 300,
            width: 600
        }
    });
});

<dx-polar-chart ... >
    <dxo-size
        [height]="300"
        [width]="600">
    </dxo-size>
</dx-polar-chart>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    // ...
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxPolarChartModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxPolarChartModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

<template>
    <DxPolarChart ... >
        <DxSize
            :height="300"
            :width="600"
        />
    </DxPolarChart>
</template>

<script>

import DxPolarChart, {
    DxSize
} from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart,
        DxSize
    },
    // ...
}
</script>

import React from 'react';

import PolarChart, {
    Size
} from 'devextreme-react/polar-chart';

class App extends React.Component {
    render() {
        return (
            <PolarChart ... >
                <Size
                    height={300}
                    width={600}
                />
            </PolarChart>
        );
    }
}
export default App;

Alternatively, you can style the UI component's container using CSS:

$(function() {
    $("#polarChart").dxPolarChart({
        // ...
    });
});

#polarChart {
    width: 85%;
    height: 70%;
}

<dx-polar-chart ...
    id="polarChart">
</dx-polar-chart>

#polarChart {
    width: 85%;
    height: 70%;
}

<template>
    <DxPolarChart ...
        id="polarChart">
    </DxPolarChart>
</template>

<script>
import DxPolarChart from 'devextreme-vue/polar-chart';

export default {
    components: {
        DxPolarChart
    },
    // ...
}
</script>

<style>
#polarChart {
    width: 85%;
    height: 70%;
}
</style>

import React from 'react';

import PolarChart from 'devextreme-react/polar-chart';

class App extends React.Component {
    render() {
        return (
            <PolarChart ...
                id="polarChart">
            </PolarChart>
        );
    }
}
export default App;

#polarChart {
    width: 85%;
    height: 70%;
}

A theme is a UI component configuration that gives the UI component a distinctive appearance. You can use one of the predefined themes or create a custom one. Changing the property values in the UI component's configuration object overrides the theme's corresponding values.

The UI component's title is a short text that usually indicates what is visualized. If you need to specify the title's text only, assign it directly to the title property. Otherwise, set this property to an object with the text and other fields specified.

The title can be accompanied by a subtitle elaborating on the visualized subject using the title.subtitle object.

Chart Demo

A tooltip is a miniature rectangle displaying values of a series point. A tooltip appears when the end-user hovers the cursor over a series point. You can enable/disable tooltips, change their appearance and format their text using fields of the tooltip configuration object.

In a polar coordinate system, the argument axis is a circle because it tracks a continuous angle change. When the argument in the chart's data source is discrete, you may want to display the argument axis as a discrete axis. For this purpose, set the useSpiderWeb property to true. In this instance, the argument axis, as well as the value axis' grid lines, will be displayed by straight lines between axis ticks/grid lines.

The spider web property is supported in the following series types.

• line
• area
• scatter

View Demo

For charting, the polar coordinate system is used to determine each point uniquely on a plane through two numbers, the argument and the value of the point. A circular and straight lines (the axis of arguments and the axis of values) are specified to define the coordinates. To define the argument axis, use the argumentAxis configuration object. To define the value axis, use the valueAxis configuration object.

To set the properties of all axes to a common value, use the commonAxisSettings configuration object. It exposes properties that can be specified for all axes simultaneously. Note that the value specified for an axis individually (in the argumentAxis or valueAxis object) overrides the value that specified in the commonAxisSettings object.