Changed package heirachy. Merged Controller and StartScreenController.

#refactor

src/main/java/seng302/model/PolarTable.java

@@ -0,0 +1,164 @@
+package seng302.model;
+
+import java.io.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+
+/**
+ * A static class for parsing and storing the polars. Will parse the whole polar table and also store the optimised
+ * upwind and downwind in separate tables here as well
+ * Created by wmu16 on 22/05/17.
+ */
+public final class PolarTable {
+
+    //A Polar table will consist of a wind speed key to a hashmap value of pairs of wind angles and boat speeds
+    private static HashMap<Double, HashMap<Double, Double>> polarTable;
+    private static HashMap<Double, HashMap<Double, Double>> upwindOptimal;
+    private static HashMap<Double, HashMap<Double, Double>> downwindOptimal;
+
+    private static int upTwaIndex;
+    private static int dnTwaIndex;
+
+
+    /**
+     * Iterates through each row of the polar table, in pairs, to extract the row into a hashmap of angle to boat speed.
+     * These angle boatspeed hashmaps are then added to an outer hashmap at the end of wind speed key to each row hashmap
+     * as a value
+     */
+    public static void parsePolarFile(InputStream polarFile) {
+        polarTable = new HashMap<>();
+        upwindOptimal = new HashMap<>();
+        downwindOptimal = new HashMap<>();
+
+        String line;
+        Boolean isHeaderLine = true;
+
+        try (BufferedReader br = new BufferedReader(new InputStreamReader(polarFile))) {
+            while ((line = br.readLine()) != null) {
+                String[] thisLine = line.split(",");
+
+                //Initial line in file
+                if (isHeaderLine) {
+                    deduceHeaders(thisLine);
+                    isHeaderLine = false;
+                } else {
+                    HashMap<Double, Double> thisPolar = new HashMap<>();
+                    HashMap<Double, Double> thisUpWindPolar = new HashMap<>();
+                    HashMap<Double, Double> thisDnWindPolar = new HashMap<>();
+                    Double thisWindSpeed = Double.parseDouble(thisLine[0]);
+
+                    // -3 <== -1 for length -1, and a further -2 as we iterate in pairs of 2 so finish before final 2
+                    for (int i = 1; i < thisLine.length; i += 2) {
+                        Double thisWindAngle = Double.parseDouble(thisLine[i]);
+                        Double thisBoatSpeed = Double.parseDouble(thisLine[i + 1]);
+                        thisPolar.put(thisWindAngle, thisBoatSpeed);
+                        if (i == upTwaIndex) {
+                            thisUpWindPolar.put(thisWindAngle, thisBoatSpeed);
+                        } else if (i == dnTwaIndex) {
+                            thisDnWindPolar.put(thisWindAngle, thisBoatSpeed);
+                        }
+                    }
+
+                    polarTable.put(thisWindSpeed, thisPolar);
+                    upwindOptimal.put(thisWindSpeed, thisUpWindPolar);
+                    downwindOptimal.put(thisWindSpeed, thisDnWindPolar);
+                }
+            }
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+
+    }
+
+
+
+    /**
+     * Parses the header line of a polar file
+     * @param thisLine The line which is the header of a polar file
+     */
+    private static void deduceHeaders(String[] thisLine) {
+
+        for (int i = 0; i < thisLine.length; i++) {
+            String thisItem = thisLine[i];
+            if (thisItem.toLowerCase().startsWith("uptwa")) {
+                upTwaIndex = i;
+            }
+            else if (thisItem.toLowerCase().startsWith("dntwa")) {
+                dnTwaIndex = i;
+            }
+        }
+    }
+
+
+    /**
+     * @return The entire polar table
+     */
+    public static HashMap<Double, HashMap<Double, Double>> getPolarTable() {
+        return polarTable;
+    }
+
+
+    /**
+     * @return The polar table just containing the optimal upwind values
+     */
+    public static HashMap<Double, HashMap<Double, Double>> getUpwindOptimal() {
+        return upwindOptimal;
+    }
+
+
+    /**
+     * @return The polar table just containing the optimal downwind values
+     */
+    public static HashMap<Double, HashMap<Double, Double>> getDownwindOptimal() {
+        return downwindOptimal;
+    }
+
+
+    /**
+     * Will raise an exception if a polar table has just one row of data
+     * @param thisWindSpeed The current wind speed
+     * @return HashMap containing just the optimal upwind angle and resulting boat speed
+     */
+    public static HashMap<Double, Double> getOptimalUpwindVMG(Double thisWindSpeed) {
+
+        Double polarWindSpeed = getClosestMatch(thisWindSpeed);
+        return upwindOptimal.get(polarWindSpeed);
+    }
+
+
+    /**
+     * Will raise an exception if a polar table has just one row of data
+     * @param thisWindSpeed The current wind speed
+     * @return HashMap containing just the optimal downwind angle and resulting boat speed
+     */
+    public static HashMap<Double, Double> getOptimalDownwindVMG(Double thisWindSpeed) {
+
+        Double polarWindSpeed = getClosestMatch(thisWindSpeed);
+        return downwindOptimal.get(polarWindSpeed);
+    }
+
+
+    private static Double getClosestMatch(Double thisWindSpeed) {
+
+        ArrayList<Double> windValues = new ArrayList<>(polarTable.keySet());
+
+        Double lowerVal = windValues.get(0);
+        Double upperVal = windValues.get(1);
+
+        for(int i = 0; i < windValues.size() - 1; i++) {
+            lowerVal = windValues.get(i);
+            upperVal = windValues.get(i+1);
+            if (thisWindSpeed <= upperVal) {
+                break;
+            }
+        }
+
+        Double lowerDiff = Math.abs(lowerVal - thisWindSpeed);
+        Double upperDiff = Math.abs(upperVal - thisWindSpeed);
+
+        return (lowerDiff <= upperDiff) ? lowerVal : upperVal;
+    }
+
+}