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Fixed Polars.calculateVMG function - it was using non-existent keys in some circumstances.

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#story[873] #pair[fjc40,jam339]
This commit is contained in:
fjc40
2017-05-11 11:58:02 +12:00
parent 238b97c016
commit 3b2f99b7d7
1 changed files with 20 additions and 11 deletions
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mock/src/main/java/seng302/Model/Polars.java
+20 -11
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@@ -35,7 +35,6 @@ public class Polars {
polarValues.put(newKey, boatSpeed);
}
//TODO calculate VMG from (windAngle, destAngle, windSpeed).
/**
* Calculates the VMG for a given wind angle, wind speed, and angle to destination.
@@ -65,27 +64,37 @@ public class Polars {
ArrayList<Double> windAngles = new ArrayList<>();
for (Pair<Double, Double> key : this.polarValues.keySet()) {
windAngles.add(key.getValue());
//Don't add angles multiple times.
double angle = key.getValue();
if (!windAngles.contains(angle)) {
windAngles.add(angle);
}
}
//Find the angle with the best VMG.
//TODO need to differentiate between windward and leeward.
double bestVMGAngle = 0;
double bestVMGVelocity = 0;
for (double tackAngle : windAngles) {
//This is the velocity from the polar table at this wind speed/angle.
double estVelocity = this.polarValues.get(new Pair<Double,Double>(polarWindSpeed, tackAngle));
double angleBetweenDestAndTack = tackAngle - destinationAngle;
//This is the estimated velocity towards the target (e.g., angling away from the target reduces velocity).
double vmgTemp = Math.cos(angleBetweenDestAndTack) * estVelocity;
Pair<Double,Double> key = new Pair<Double,Double>(polarWindSpeed, tackAngle);
if (this.polarValues.containsKey(key)) {
//This is the velocity from the polar table at this wind speed/angle.
double estVelocity = this.polarValues.get(key);
double angleBetweenDestAndTack = tackAngle - destinationAngle;
//This is the estimated velocity towards the target (e.g., angling away from the target reduces velocity).
double vmgTemp = Math.cos(angleBetweenDestAndTack) * estVelocity;
//Check that the velocity is better.
if (vmgTemp > bestVMGVelocity) {
bestVMGVelocity = vmgTemp;
bestVMGAngle = tackAngle;
}
//Check that the velocity is better.
if (vmgTemp > bestVMGVelocity) {
bestVMGVelocity = vmgTemp;
bestVMGAngle = tackAngle;
}
}
System.out.println("VMG speed = " + bestVMGVelocity + " , VMG angle = " + bestVMGAngle);//TEMP DEBUG REMOVE
//Create the VMG object and return it.
return new VMG(bestVMGVelocity, bestVMGAngle);