Merge pull request #739 from RickZaki/GHissue-643

fix: issue 643 - Fahrenheit values in graph were converted twice

webapp/frontend/src/app/modules/dashboard/dashboard.component.ts

@@ -159,9 +159,18 @@ export class DashboardComponent implements OnInit, AfterViewInit, OnDestroy
 
             for(const tempHistory of deviceSummary.temp_history){
                 const newDate = new Date(tempHistory.date);
+                let temperature;
+                switch (this.config.temperature_unit) {
+                    case 'celsius':
+                        temperature = tempHistory.temp;
+                        break
+                    case 'fahrenheit':
+                        temperature = TemperaturePipe.celsiusToFahrenheit(tempHistory.temp)
+                        break
+                }
                 deviceSeriesMetadata.data.push({
                     x: newDate,
-                    y: TemperaturePipe.formatTemperature(tempHistory.temp, this.config.temperature_unit, false)
+                    y: temperature
                 })
             }
             deviceTemperatureSeries.push(deviceSeriesMetadata)

webapp/frontend/src/app/shared/temperature.pipe.spec.ts

@@ -11,16 +11,16 @@ describe('TemperaturePipe', () => {
         const testCases = [
             {
                 'c': -273.15,
-                'f': -460,
+                'f': -459.66999999999996,
             },{
                 'c': -34.44,
-                'f': -30,
+                'f': -29.991999999999997,
             },{
                 'c': -23.33,
-                'f': -10,
+                'f': -9.993999999999993,
             },{
                 'c': -17.78,
-                'f': -0,
+                'f': -0.0040000000000048885,
             },{
                 'c': 0,
                 'f': 32,
@@ -29,10 +29,10 @@ describe('TemperaturePipe', () => {
                 'f': 50,
             },{
                 'c': 26.67,
-                'f': 80,
+                'f': 80.006,
             },{
                 'c': 37,
-                'f': 99,
+                'f': 98.6,
             },{
                 'c': 60,
                 'f': 140,
@@ -42,8 +42,7 @@ describe('TemperaturePipe', () => {
             it(`should correctly convert ${test.c}, Celsius to Fahrenheit (testcase: ${index + 1})`, () => {
                 // test
                 const numb = TemperaturePipe.celsiusToFahrenheit(test.c)
-                const roundNumb = Math.round(numb);
-                expect(roundNumb).toEqual(test.f);
+                expect(numb).toEqual(test.f);
             });
         })
     });
@@ -55,6 +54,11 @@ describe('TemperaturePipe', () => {
                 'unit': 'celsius',
                 'includeUnits': true,
                 'result': '26.67°C'
+            },{
+                'c': 26.6767,
+                'unit': 'celsius',
+                'includeUnits': true,
+                'result': '26.677°C'
             },{
                 'c': 26.67,
                 'unit': 'celsius',
@@ -64,12 +68,17 @@ describe('TemperaturePipe', () => {
                 'c': 26.67,
                 'unit': 'fahrenheit',
                 'includeUnits': true,
-                'result': '80.006°F',
+                'result': '26.67°F',
+            },{
+                'c': 26.6767,
+                'unit': 'fahrenheit',
+                'includeUnits': true,
+                'result': '26.677°F',
             },{
                 'c': 26.67,
                 'unit': 'fahrenheit',
                 'includeUnits': false,
-                'result': '80.006',
+                'result': '26.67',
             }
         ]
         testCases.forEach((test, index) => {

webapp/frontend/src/app/shared/temperature.pipe.ts

@@ -6,29 +6,35 @@ import {formatNumber} from '@angular/common';
 })
 export class TemperaturePipe implements PipeTransform {
     static celsiusToFahrenheit(celsiusTemp: number): number {
-        return celsiusTemp * 9.0 / 5.0 + 32;
+        return celsiusTemp * 9/5 + 32;
     }
-    static formatTemperature(celsiusTemp: number, unit: string, includeUnits: boolean): number|string {
-        let convertedTemp
-        let convertedUnitSuffix
+    static formatTemperature(temp: number, unit: string, includeUnits: boolean): number|string {
+        let unitSuffix
         switch (unit) {
             case 'celsius':
-                convertedTemp = celsiusTemp
-                convertedUnitSuffix = '°C'
+                unitSuffix = '°C'
                 break
             case 'fahrenheit':
-                convertedTemp = TemperaturePipe.celsiusToFahrenheit(celsiusTemp)
-                convertedUnitSuffix = '°F'
+                unitSuffix = '°F'
                 break
         }
         if(includeUnits){
-            return formatNumber(convertedTemp, 'en-US') + convertedUnitSuffix
+            return formatNumber(temp, 'en-US') + unitSuffix
         } else {
-            return formatNumber(convertedTemp, 'en-US',)
+            return formatNumber(temp, 'en-US',)
         }
     }
 
   transform(celsiusTemp: number, unit = 'celsius', includeUnits = false): number|string {
+        let temperature;
+        switch (unit) {
+            case 'celsius':
+                temperature = celsiusTemp;
+                break
+            case 'fahrenheit':
+                temperature = TemperaturePipe.celsiusToFahrenheit(celsiusTemp)
+                break
+        }
         return TemperaturePipe.formatTemperature(celsiusTemp, unit, includeUnits)
   }