AxisTypes has a better toString method

pdb-js/src/app/plot.service.ts

@@ -128,20 +128,49 @@ export enum DataType {
 }
 
 export class AxesTypes {
-  x : Set<DataType>;
-  y : Set<DataType>;
+  x : Array<DataType>;
+  y : Array<DataType>;
   
-  constructor(x: Set<DataType>, y : Set<DataType>) {
+  constructor(x: Array<DataType>, y : Array<DataType>) {
     this.x = x;
     this.y = y;
   }
   
   hasXAxis(type : DataType){
-    return this.x.has(type);
+    return this.x.includes(type);
   }
   
   hasYAxis(type : DataType){
-    return this.y.has(type);
+    return this.y.includes(type);
+  }
+  
+  /**
+   * return the 1-indexed axis data type, e.g. getXAxisDataType(1) for the x1 axis 
+   */
+  getXAxisDataType(index: number){
+    if (this.x.length+1 >= index){
+      return this.x[index-1];
+    }
+    return undefined;
+  }
+  
+  /**
+   * return the 1-indexed axis data type, e.g. getYAxisDataType(1) for the x1 axis 
+   */
+  getYAxisDataType(index: number){
+    if (this.y.length+1 >= index){
+      return this.y[index-1];
+    }
+    return undefined;
+  }
+  
+  toString() {
+    const x1 = this.getXAxisDataType(1);
+    const y1 = this.getYAxisDataType(1);
+    const x2 = this.getXAxisDataType(2);
+    const y2 = this.getYAxisDataType(2);
+  
+    return "x1:"+DataType[x1]+ " y1:"+DataType[y1]+ " x2:"+DataType[x2]+ " y2:"+DataType[y2]; 
   }
 }