FIX: Battery.current didn't respect sign of wire current

src/main/angular/src/app/editor/circuit/Calculation.ts

@@ -22,9 +22,12 @@ export class Calculation {
     readonly junctionsWithoutPivot: Junction[],
     readonly wires: Wire[]) {
     this.matrixInit(junctionsWithoutPivot.length);
+
     this.wires.forEach(wire => this.addResistor(wire));
     this.parts.filter(p => p instanceof Battery).forEach(battery => this.addCurrentSource(battery));
+
     this.solve();
+
     this.wires.forEach(wire => this.useCurrent(wire));
     const minCircuitVoltage = this.potentials.reduce((a, b) => a < b ? a : b, 0);
     const maxCircuitVoltage = this.potentials.reduce((a, b) => a > b ? a : b, 0);
@@ -34,9 +37,11 @@ export class Calculation {
       junction.voltage = this.getPotential(junctionsWithoutPivot.indexOf(junction));
       console.debug("      junction", junction.fullName, junction.voltage, 'V');
     });
+
     pivot.minCircuitVoltage = minCircuitVoltage;
     pivot.maxCircuitVoltage = maxCircuitVoltage;
     pivot.voltage = 0;
+
     const junctionCountIncludingPivot = junctionsWithoutPivot.length + 1;
     console.debug(`    => Circuit #${number} (${parts.length} parts, ${junctionCountIncludingPivot} junctions, ${wires.length} wires)`);
   }
@@ -91,7 +96,7 @@ export class Calculation {
   private addCurrentSource(battery: Battery) {
     const indexMinus = this.junctionsWithoutPivot.indexOf(battery.minus);
     const indexPlus = this.junctionsWithoutPivot.indexOf(battery.plus);
-    const current = battery.voltage / battery.resistance;
+    const current = battery.voltage / battery.resistance.resistance;
     if (indexMinus >= 0) {
       this.currents[indexMinus] += current;
     }

src/main/angular/src/app/editor/circuit/Circuit.ts

@@ -27,7 +27,7 @@ export class Circuit {
       Calculation.calculate(this);
       const changedParts = [];
       for (const part of this.parts) {
-        if (part.loop()) {
+        if (part.postCalculate()) {
           changedParts.push(part);
         }
       }

src/main/angular/src/app/editor/junction/Junction.ts

@@ -68,13 +68,6 @@ export class Junction {
     this._rect = this.findRect();
   }
 
-  sumAllBut(plus: Junction) {
-    return this.wires
-      .filter(wire => wire.traverse(this) !== plus)
-      .map(wire => wire.current)
-      .reduce((a, b) => a + b, 0);
-  }
-
   private findRect(): Rect {
     const child = document.getElementById(this.uuid);
     if (!child) {

src/main/angular/src/app/editor/parts/Part.ts

@@ -39,7 +39,7 @@ export abstract class Part {
     this.junctions.forEach(junction => junction.updatePosition());
   }
 
-  loop(): boolean {
+  postCalculate(): boolean {
     return false;
   };
 

src/main/angular/src/app/editor/parts/battery/Battery.ts

@@ -11,28 +11,33 @@ export class Battery extends Part {
 
   readonly plus: Junction = new Junction(this, 85, 50, "+");
 
+  readonly resistance: Wire;
+
+  current: number = 0;
+
   constructor(
     circuit: Circuit,
     rasterX: number,
     rasterY: number,
     name: string,
     public voltage: number,
-    public resistance: number,
+    resistance: number,
   ) {
     super(circuit, PartType.Battery, name, rasterX, rasterY);
-    new Wire(this.minus, this.plus, resistance, "Innenwiderstand");
+    this.resistance = new Wire(this.minus, this.plus, resistance, "Innenwiderstand");
   }
 
   override get junctions(): Junction[] {
     return [this.minus, this.plus];
   }
 
-  get voltageStr(): string {
-    return siPrefix(Math.abs(this.voltage), 'V', 2);
+  override postCalculate(): boolean {
+    this.current = this.minus.wires.map(wire => wire.currentFrom(this.minus)).reduce((a, b) => a + b, -this.resistance.current)
+    return false;
   }
 
-  get current(): number {
-    return this.minus.sumAllBut(this.plus);
+  get voltageStr(): string {
+    return siPrefix(Math.abs(this.voltage), 'V', 2);
   }
 
   get currentStr(): string {

src/main/angular/src/app/editor/parts/relay/Relay.ts

@@ -69,7 +69,7 @@ export class Relay extends Part {
     return siPrefix(Math.abs(this.current) || 0, 'A', 2);
   }
 
-  override loop(): boolean {
+  override postCalculate(): boolean {
     const shouldBeActive = this.isCoilActive;
     const isActive = this.contact.end === this.active;
     if (isActive != shouldBeActive) {

src/main/angular/src/app/editor/wire/Wire.ts

@@ -1,6 +1,5 @@
 import {Junction} from "../junction/Junction";
 import {RESISTANCE_MIN} from '../circuit/Calculation';
-import {fadeColor} from '../colorHelpers';
 
 export const ANIMATION_ELECTRON_STEPS = 20;
 
@@ -51,15 +50,13 @@ export class Wire {
     this.current = 0;
   }
 
-  voltageColor(): string {
-    if (this.start.voltage === null || this.end.voltage === null || this.start.minCircuitVoltage === null || this.start.maxCircuitVoltage === null) {
-      return 'lightgray';
+  currentFrom(junction: Junction) {
+    if (this.start === junction) {
+      return this.current;
+    } else if (this.end === junction) {
+      return -this.current;
     }
-    const ratio = ((this.end.voltage + this.start.voltage) / 2 - this.start.minCircuitVoltage) / (this.start.maxCircuitVoltage - this.start.minCircuitVoltage);
-    if (ratio < 0.5) {
-      return fadeColor(ratio * 2, '#008cff', 'magenta');
-    }
-    return fadeColor((ratio - 0.5) * 2, 'magenta', 'red');
+    throw new Error(`Wire is not connected to given Junction: wire=${this}, junction=${junction}`);
   }
 
 }