Implemented GPS coordinate to screen coordinate conversion

- Created Coordinate class with getters
- Created Map class
- Created convertGPS method in Map
#story [9], #pair [cbt24,fwy13]

src/main/java/seng302/Coordinate.java

@@ -0,0 +1,19 @@
+package seng302;
+
+/**
+ * Created by cbt24 on 15/03/17.
+ */
+public class Coordinate {
+    private int x;
+    private int y;
+
+    public Coordinate(int x, int y) { this.x = x; this.y = y; }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+}

src/main/java/seng302/Map.java

@@ -0,0 +1,24 @@
+package seng302;
+
+/**
+ * Created by cbt24 on 15/03/17.
+ */
+public class Map {
+    private double x1, x2, y1, y2;
+    private int width, height;
+
+    public Map(double x1, double y1, double x2, double y2, int width, int height) {
+        this.x1 = x1; this.x2 = x2; this.y1 = y1; this.y2 = y2; this.width = width; this.height = height;
+    }
+
+    /**
+     * Converts GPS coordinates to coordinates for container
+     * @param lat GPS latitude
+     * @param lon GPS longitude
+     * @return Coordinate (pair of doubles)
+     * @see seng302.Coordinate
+     */
+    public Coordinate convertGPS(double lat, double lon) {
+        return new Coordinate((int)(width * (lat-x1)/(x2-x1)), (int)(height * (lon-x1)/(x2-x1)));
+    }
+}