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ColorPalette.md

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Adding Color to your Visual

Color is exposed as one of the services available on IVisualHost.

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Add Color to Data Points

Each data point will be represented by a different color. Add color to the BarChartDataPoint interface.

/**
 * Interface for BarChart data points.
 *
 * @interface
 * @property {number} value    - Data value for point.
 * @property {string} category - Corresponding category of data value.
 * @property {string} color    - Color corresponding to data point.
 */
interface BarChartDataPoint {
    value: number;
    category: string;
    color: string;
};

Color Palette

colorPalette is a service that manages the colors used on your visual. An instance of it is available on IVisualHost.

Assigning Color to Data Points

We defined visualTransform as a construct to convert dataView to a view model Bar Chart can use. Since we iterate through the data points in visualTransform it is also the ideal place to assign colors.

let colorPalette: IColorPalette = host.colorPalette; // host: IVisualHost
for (let i = 0, len = Math.max(category.values.length, dataValue.values.length); i < len; i++) {
    barChartDataPoints.push({
        category: category.values[i],
        value: dataValue.values[i],
        color: colorPalette.getColor(category.values[i]).value,
    });
}