some updates

src/index.ts

@@ -32,14 +32,8 @@ import includes from 'lodash/includes';
 import first from 'lodash/first';
 import last from 'lodash/last';
 import mergeWith from 'lodash/mergeWith';
-import min from 'lodash/min';
-import minBy from 'lodash/minBy';
-import max from 'lodash/max';
-import maxBy from 'lodash/maxBy';
 import add from 'lodash/add';
 import replace from 'lodash/replace';
-import reverse from 'lodash/reverse';
-import sortBy from 'lodash/sortBy';
 import cloneDeep from 'lodash/cloneDeep';
 import debounce from 'lodash/debounce';
 import has from 'lodash/has';
@@ -142,11 +136,6 @@ abstract class ChartwerkPod<T extends TimeSerie, O extends Options> {
   // components
   protected grid: Grid;
 
-  // TODO: test variables instead of functions with cache
-  private _xScale: d3.ScaleLinear<number, number> | null = null;
-  private _yScale: d3.ScaleLinear<number, number> | null = null;
-  private _y1Scale: d3.ScaleLinear<number, number> | null = null;
-
   constructor(
     // maybe it's not the best idea
     _d3: typeof d3,
@@ -180,7 +169,6 @@ abstract class ChartwerkPod<T extends TimeSerie, O extends Options> {
   }
 
   public render(): void {
-    console.log('render');
     this.renderAxes();
     this.renderGrid();
 
@@ -608,8 +596,7 @@ abstract class ChartwerkPod<T extends TimeSerie, O extends Options> {
 
     this.onPanningRescale(event);
 
-    const shouldClearState = false;
-    this.clearScaleCache(shouldClearState);
+    // TODO: check clear state for necessity
     this.renderYAxis();
     this.renderXAxis();
 
@@ -839,6 +826,7 @@ abstract class ChartwerkPod<T extends TimeSerie, O extends Options> {
     }
   }
 
+  // TODO: move to State
   get absXScale(): d3.ScaleLinear<number, number> {
     const domain = [0, Math.abs(this.state.maxValueX - this.state.minValueX)];
     return this.d3.scaleLinear()
@@ -853,6 +841,7 @@ abstract class ChartwerkPod<T extends TimeSerie, O extends Options> {
       .range([0, this.height]);
   }
 
+  // TODO: these getters can be removed, but it will break all Pods.
   get xScale(): d3.ScaleLinear<number, number> {
     return this.state.xScale;
   }
@@ -1008,16 +997,8 @@ abstract class ChartwerkPod<T extends TimeSerie, O extends Options> {
     return confidenceMetric;
   }
 
-  protected clearScaleCache(shouldClearState = true): void {
-    this._xScale = null;
-    this._yScale = null;
-    this._y1Scale = null;
-    if(shouldClearState) {
-      this.state.xValueRange = undefined;
-      this.state.yValueRange = undefined;
-      this.state.y1ValueRange = undefined;
-      this.state.transform = { x: 0, y: 0, k: 1 };
-    }
+  protected clearState(): void {
+    this.state.clearState();
   }
 
   protected getSerieColor(idx: number): string {

src/state.ts

@@ -21,7 +21,6 @@ const DEFAULT_TRANSFORM = {
 
 // TODO: replace all getters with fields. Because getters will be recalculated on each call. Use scales as example.
 // TODO: remove duplicates in max/min values.
-// TODO: add scales
 // TODO: PodState can be divided in two classes, but it is hard now. 
 export class PodState<T extends TimeSerie, O extends Options> {
   private _xValueRange: [number, number];
@@ -38,11 +37,11 @@ export class PodState<T extends TimeSerie, O extends Options> {
     protected series: T[],
     protected options: O,
   ) {
-    this.initRanges();
+    this.setInitialRanges();
     this.initScales();
   }
 
-  protected initRanges(): void {
+  protected setInitialRanges(): void {
     this._xValueRange = [this.minValueX, this.maxValueX];
     this._yValueRange = [this.minValueY, this.maxValueY];
     this._y1ValueRange = [this.minValueY1, this.maxValueY1];
@@ -83,6 +82,12 @@ export class PodState<T extends TimeSerie, O extends Options> {
       .range([this.boxParams.height, 0]); // inversed, because d3 y-axis goes from top to bottom
   }
 
+  public clearState(): void {
+    this.setInitialRanges();
+    this.initScales();
+    this._transform = { x: 0, y: 0, k: 1 };
+  }
+
   get yScale(): d3.ScaleLinear<number, number> {
     return this._yScale;
   }