Create Your Own Themes

Assume that you have to create a theme named mySampleTheme, which needs to include the properties listed below:

  • For all charts, gauges, and maps:

    • Set palette colors to: #0075c2, #1aaf5d, #f2c500.

    • Set the subcaption to Harry's SuperMart throughout the application and ensure that it cannot be changed.

    • Define uniform cosmetics for the caption and subcaption.

    • Enable hover effects for data plots.

    • Set uniform cosmetics for all trendlines and render them as dashed.

  • For all column 2D charts:

    • Ensure data plots for positive data values are rendered using the color code: #3333FF.

    • Ensure data plots for negative data values are rendered using the color code: #CC0000.

  • For all bubble charts:

    • Show quadrant lines with uniform cosmetics.

    • Set uniform cosmetics for regression lines.

  • For all pie 2D charts:

    • Show percentage values in tooltips.

    • Enable smart labels.

  • For all zoom line charts:

    • Set a minimum distance between anchor points.
  • For all Gantt charts:

    • Set the cosmetics for header texts of processes.
  • For all maps:

    • Show short names as labels and not in the tooltip text.

    • Set the fill hover color and transparency for entities and markers.

    • Set uniform cosmetics for all marker connectors.

Given below is a stepwise procedure for creating this theme:

Step 1: In a text editor, create a new text file. Name this file mySampleTheme.js. Save it in the js/themes folder.

Step 2: Map properties to tiers, as listed below:

  • Map global properties for all charts, gauges, and maps in the application, to the base tier.

  • Map properties specific to column 2D charts to the column2d tier.

  • Map properties specific to bubble charts to the bubble tier.

  • Map properties specific to pie2d charts to the pie2d tier.

  • Map properties specific to zoom line charts to the zoomline tier.

  • Map properties specific to Gantt charts to the gantt tier.

  • Map global properties for all maps in the application, to the geo tier.

Step 3: Determine the structure of each tier by mapping the attributes to be defined with the objects they belong to, as listed below:

  • Within the base tier:

    • Use the paletteColors attribute (under the chart object) to configure palette colors for the data plots.

    • Use the subCaption attribute (under the chart object) to set the subcaption to Harry's SuperMart.

    • Use the captionFontSize, subCaptionFontSize, captionFontBold, and subCaptionFontBold attributes (under the chart object) to define uniform cosmetics for the caption and subcaption.

    • Use the showHoverEffect attribute (under the chart object) to enable hover effects for all data plots.

    • Use the color, thickness, dashed, dashLen, and dashGap attributes (under the trendlines object) to set uniform cosmetics for all trendlines.

  • Within the column2d tier:

    • Use the color attribute (under the data object, which belongs to the dataset object) to set different color codes for data plots representing positive and negative data values.
  • Within the bubble tier:

    • Use the drawQuadrant attribute (under the chart object) to show quadrant lines.

    • Use the quadrantLineColor, quadrantLineThickness, and quadrantLineAlpha objects (under the chart object) to set uniform cosmetics for all quadrant lines.

    • Use the regressionLineColor, regressionLineThickness, and regressionLineAlpha objects (under the chart object) to set uniform cosmetics for all regression lines.

  • Within the pie2d tier:

    • Use the showPercentInToolTip attribute (under the chart object) to show percentage values in tooltip.

    • Use the enableSmartLabels attribute (under the chart object) to enable smart labels.

  • Within the zoomline tier:

    • Use the anchorMinRenderDistance attribute (under the chart object) to set a minimum distance between anchor points.
  • Within the gantt tier:

    • Use the headerFont, headerFontSize, headerFontColor, headerIsBold, headerIsUnderline, headerAlign, and headerVAlign attributes (under the processes object) to set the cosmetics for the header texts of processes.
  • Within the geo tier:

    • Use the showLabels, useSNameInLabels, and useSNameInToolTip attributes (under the chart object) to show short names as labels, instead of tooltip text.

    • Use the entityFillHoverColor and entityFillHoverAlpha attributes (under the chart object) to set fill hover color and transparency for the entities.

    • Use the markerFillHoverColor and markerFillHoverAlpha attributes (under the chart object) to set fill hover color and transparency for the markers.

    • Use the color, thickness, alpha, dashed, dashLen, and dashGap attributes (under the connector object, which belongs to the marker object) to set uniform cosmetics for all marker connectors.

Step 4: Add the JavaScript code for the theme in the theme file. Based on the mapping shown above, write the JavaScript code for your theme in the mySampleTheme.js file that you created in Step 1.

Refer to the code for the new theme, given below:

//The `FusionCharts.register()` API is used to register the new theme in the FusionCharts core.
FusionCharts.register('theme', {
    name: 'mySampleTheme',
    theme: {
        base: {
            chart: {
                paletteColors: '#0075c2,#1aaf5d,#f2c500',
                subCaption: 'Harry's SuperMart !important', //The !important directive is used to ensure that the subcaption cannot be overriden in the theme definition or in the chart data.
                captionFontSize: '14'
                subCaptionFontSize: '12'
                captionFontBold: '1',
                subCaptionFontBold: '0',
                showHoverEffect: '1',
                placeValuesInside: '0'
            },
            trendlines: [{
                color: '#FF000',
                thickness: '3',
                dashed: '1',
                dashLen: '4',
                dashGap: '2'
            }]
        },
        column2d: {
            dataset: {
                data: function(dataObj) {
                    color: (Number(dataObj.value) < 0 ? "#3333FF" : "#CC0000"),
                }
            }
        }
        bubble: {
            chart: {
                drawQuadrant: '1',
                quadrantLineColor: '3',
                quadrantLineThickness: '1',
                quadrantLineAlpha: '4',
            },
            dataset: [{
                regressionLineColor: '#123456',
                regressionLineThickness: '3',
                regressionLineAlpha: '70'  
            }]
        }
        pie2d: {
            chart: {
                showPercentInToolTip: '1',
                enableSmartLabels: '1'
            }
        },
        zoomline: {
            chart: {
                anchorMinRenderDistance : '20'                
            }
        },        
        gantt: {
            processes: [{
                headerFont: 'Arial',
                headerFontSize: '16',
                headerFontColor: '#321ABC',
                headerIsBold: '1',
                headerIsUnderline: '1',
                headerAlign: 'left',
                headerVAlign: 'bottom'
            }]
        },      
        geo: {
            chart: {
                showLabels: '1',
                useSNameInLabels: '1',
                useSNameInToolTip: '0',
                entityFillHoverColor: '#9A9A9A',
                entityFillHoverAlpha: '60',
                markerFillHoverColor: '#8AE65C',
                markerFillHoverAlpha: '60',
            }
            marker: {
                connector: {
                    thickness: '4',
                    color: '#336699',
                    alpha: '60',
                    dashed: '1',
                    dashLen: '4',
                    dashGap: '2'
                }
            }
        }
    }
});

Step 5: Apply your new theme to the charts, gauges, and maps in your application, using either the theme attribute of the chart object or the setChartAttribute() method of the FusionCharts API.

Create and register multiple themes

If you need to create multiple new themes for your application, then ideally you should include all theme definitions in the same file. That way, you will have to include only one .js file in your application, instead of multiple files. You can then change the theme name, as the value of the theme attribute, or as the parameter of the setChartAttribute() method.

Refer to the code below for a sample:

{
    var myTheme1 = {
        name: 'my-theme-1',
        theme: {...} // Theme JSON
    },
    myTheme2 = {
        name: 'my-theme-1',
        theme: {...} // Theme JSON
    },
    myTheme3 = {
        name: 'my-theme-1',
        theme: {...} // Theme JSON
    };
}

To register all the themes in one go, use the FusionCharts.register() API as shown below:

FusionCharts.register('theme', [myTheme1, myTheme2, myTheme3]);

You can also create and register multiple themes as shown below:

FusionCharts.register('theme', [
    {name: 'my-theme-1', theme: {...}}, 
    {name: 'my-theme-2', theme: {...}}, 
    {name: 'my-theme-3', theme: {...}}
]);

Include escape characters in theme definition

You can include escape characters in definitions for new themes using the same process as the one you follow to include them when modifying existing themes. The process is detailed here.

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