The theme usually consists of a variables section (<variables>) and a chart options part (<chartOptions>). The chart options define the layout of the chart.
Note: A lot of settings can be made either by changing a theme variable or by using one of the chart options. We recommend using chart options for modifying your chart.
The following options are available to be used in the <chartOptions> section of the theme file:
<axis>: Customize the look of an axis
<axisTick>: Customize the look of the axis tickmarks
<valueBar>: (for bar charts) Customize the look of the bars used in the bar-charts
<valueLine>: (for line charts) Customize the look of the connecting line used in line charts
<valuePoint>: Customize the look of the value points (the dots on the data values) in line charts
<valueSlice>: Customize the look of the slices in pie charts
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<image>: Apply background images to the chart or particular sections of the chart
<plotArea>: Apply a background to the area bounded by the four possible axes
<chartArea>: Apply a background to the plotArea and the backgrounds of all drawn axes
<contentArea>: Apply a background to the chartArea and the background of the legend
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