export interface Color {
    backgroundColor?: string | string[];
    borderWidth?: number | number[];
    borderColor?: string | string[];
    borderCapStyle?: string;
    borderDash?: number[];
    borderDashOffset?: number;
    borderJoinStyle?: string;
    pointBorderColor?: string | string[];
    pointBackgroundColor?: string | string[];
    pointBorderWidth?: number | number[];
    pointRadius?: number | number[];
    pointHoverRadius?: number | number[];
    pointHitRadius?: number | number[];
    pointHoverBackgroundColor?: string | string[];
    pointHoverBorderColor?: string | string[];
    pointHoverBorderWidth?: number | number[];
    pointStyle?: string | string[];
    hoverBackgroundColor?: string | string[];
    hoverBorderColor?: string | string[];
    hoverBorderWidth?: number;
}
export declare const DefaultColors: number[][];
export interface Colors extends Color {
    data?: number[];
    label?: string;
}
export declare function rgba(colour: number[], alpha: number): string;
export declare function getRandomInt(min: number, max: number): number;
export declare function formatLineColor(colors: number[]): Color;
export declare function formatBarColor(colors: number[]): Color;
export declare function formatPieColors(colors: number[][]): Colors;
export declare function formatPolarAreaColors(colors: number[][]): Color;
export declare function getRandomColor(): number[];
/**
* @method Generate colors for line|bar charts
* @param index he index of the default color array. eg. 0, 1
* @return number[]
* @author vincent 2019-01-22
* @version 0.0.0
* @example
* @log 1. vincent,2019-01-22,done
*/
export declare function generateColor(index: number): number[];
/**
* @method Generate colors for pie|doughnut charts
* @param count Length of data. eg. datasets.data.length
* @return number[][]
* @author vincent 2019-01-22
* @version 0.0.0
* @example
* @log 1. vincent,2019-01-22,done
*/
export declare function generateColors(count: number): number[][];
/**
* @method Generate colors by chart type
* @param chartType The type of chart you are using. eg. line,bar
* @param index The index of the default color array. eg. DefaultColors[index]
* @param count Length of data. eg. datasets.data.length
* @return Color or number[]
* @author vincent 2019-01-22
* @version 0.0.0
* @example
* @log 1. vincent,2019-01-22,done
*/
export declare function getColors(chartType: string, index: number, count: number): Color | number[];