diff --git a/src/models/data_processor.ts b/src/models/data_processor.ts
index e69de29..6cedea2 100644
--- a/src/models/data_processor.ts
+++ b/src/models/data_processor.ts
@@ -0,0 +1,60 @@
+import { BarSerie, BarOptions, Datapoint, Color, ValueX, OpacityFormatter } from '../types';
+
+import * as _ from 'lodash';
+
+export type DataRow = {
+  key: number, // x
+  values: number[], // y list
+  colors: string[],
+  opacity: number[],
+  serieTarget: string,
+}
+
+export class DataProcessor {
+  _formattedDataRows: DataRow[];
+
+  constructor(protected series: BarSerie[], protected options: BarOptions) {
+    
+  }
+
+  public get dataRows(): DataRow[] {
+    return this._formattedDataRows;
+  }
+
+  protected setDataRowsForNonDiscreteType(): void {
+    for(let serie of this.series) {
+      const rows = _.map(serie.datapoints, (datapoint: Datapoint) => {
+        const values = _.tail(datapoint);
+        return {
+          key: datapoint[0], // x
+          values, // y list
+          colors: this.getColorsForEachValue(values, serie.color, datapoint[0], serie.target),
+          opacity: this.getOpacityForEachValue(values, serie.opacityFormatter, datapoint[0], serie.target),
+          target: serie.target,
+        }
+      });
+      this._formattedDataRows = _.concat(this._formattedDataRows, rows);
+    }
+    this._formattedDataRows = _.sortBy(this._formattedDataRows, 'key');
+  }
+
+  getColorsForEachValue(values: number[], color: Color, key: ValueX, target: string): string[] {
+    if(_.isString(color)) {
+      return _.map(values, value => color);
+    }
+    if(_.isArray(color)) {
+      return _.map(values, (value, i) => color[i] || 'red');
+    }
+    if(_.isFunction(color)) {
+      return _.map(values, (value, i) => (color as Function)({ value, barIndex: i, key, target }));
+    }
+    throw new Error(`Unknown type of serie color: ${target} ${color}`);
+  }
+
+  getOpacityForEachValue(values: number[], opacity: OpacityFormatter | undefined, key: ValueX, target: string): number[] {
+    if(opacity === undefined) {
+      return _.map(values, value => 1);
+    }
+    return _.map(values, (value, i) => opacity({ value, barIndex: i, key, target })); 
+  }
+}
diff --git a/src/types.ts b/src/types.ts
index 7aff2de..1bf9934 100755
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,51 +1,55 @@
 import { Serie, Options } from '@chartwerk/core';
 
-type ValueX = (number | string);
+export type ValueX = (number | string);
 type ValueY = number;
+export type Datapoint = [ValueX, ...ValueY[]]; // [x, y, y, y, ..., y], multiple y values as stacked bars
+export type ColorFormatter = (data: { value: ValueY, key: ValueX, barIndex: number, target: string }) => string;
+export type OpacityFormatter = (data: { value: ValueY, key: ValueX, barIndex: number, target: string }) => number;
+export type Color = string | string[] | ColorFormatter;
 
 export type BarSerieAdditionalParams = {
-  datapoints: [ValueX, ...ValueY[]]; // [x, y, y, y, ..., y], multiple y values as stacked bars
+  datapoints: Datapoint[];
   annotation?: {
     color: string;
     size: {
       max?:  number; // type always SizeType.PX
       min?: number; // type always SizeType.PX
     }
-  }
-  opacityFormatter?: (data: RowValues) => number;
-  colorFormatter?: (data: any) => string;
+  };
+  color: Color;
+  opacityFormatter?: OpacityFormatter;
 }
 export type BarSerie = Serie & BarSerieAdditionalParams;
 
 
 export type BarAdditionalOptions = {
-  group: { // for more than 1 serie and discrete.enable == true
-    by: { x: ValueX[] }; // union bars as one group, see examples/demo-group-by.html
-    size: number; // type always SizeType.PERCENT
-  };
-  discrete: {
-    enable: boolean; // if false -> render bars as time chart | group will not work, see examples/demo-non-discrete.html
-    barWidth: {
-      estimated?: { value: number, type?: SizeType };
-      max?: number; // type always SizeType.PX
-      min?: number; // type always SizeType.PX
+  type: { // BarPodType.DISCRETE or BarPodType.NON_DISCRETE. Cant be both
+    [BarPodType.DISCRETE]: {
+      groupBy: { x: ValueX[] }; // union bars as one group, see examples/demo-group-by.html
+      innerSize: { value: number, type?: SizeType.PERCENT | SizeType.PX }; // size of bars inside one group
+      groupSize: { value: number, type?: SizeType.PERCENT | SizeType.PX };
+    };
+    [BarPodType.NON_DISCRETE]: {
+      barWidth: {
+        estimated?: { value: number, type?: SizeType.UNIT | SizeType.PX };
+        max?: number; // type always SizeType.PX
+        min?: number; // type always SizeType.PX
+      }
     }
-  };
+  }
   eventsCallbacks?: {
     contextMenu?: (data: any) => void;
   };
 }
 export type BarOptions = Options & Partial<BarAdditionalOptions>;
-export type RowValues = {
-  key: number,
-  values: number[],
-  additionalValues: (null | number)[], // values in datapoints third column
-  colors: (string | ((data: any) => string))[],
-  serieTarget: string[],
-}
 
 export enum SizeType {
   UNIT = 'unit', // in units of X or Y values
   PX = 'px',
   PERCENT = 'percent', // from 0 to 100
 }
+
+export enum BarPodType {
+  DISCRETE = 'discrete', // render bars as groups
+  NON_DISCRETE = 'non-discrete', // render bars as time chart
+}