add bwmirror getDistance for points

Author: JasperGeurtz

src/main/java/bwapi/Point.java

@@ -29,6 +29,12 @@ public String toString() {
         return "[" + x + ", " + y + "]";
     }
 
+    protected double getDistance(final int x, final int y) {
+        final int dx = x - this.x;
+        final int dy = y - this.y;
+        return Math.sqrt(dx * dx + dy * dy);
+    }
+
     public boolean equals(final Object o) {
         if (!(o instanceof Point)) {
             return false;

src/main/java/bwapi/Position.java

@@ -57,4 +57,8 @@ public Position divide(final int divisor) {
     public Position multiply(final int multiplier) {
         return new Position(x * multiplier, y * multiplier);
     }
+
+    public double getDistance(final Position position) {
+        return getDistance(position.x, position.y);
+    }
 }

src/main/java/bwapi/TilePosition.java

@@ -35,4 +35,8 @@ public TilePosition divide(final int divisor) {
     public TilePosition multiply(final int multiplier) {
         return new TilePosition(x * multiplier, y * multiplier);
     }
+
+    public double getDistance(final TilePosition position) {
+        return getDistance(position.x, position.y);
+    }
 }

src/main/java/bwapi/WalkPosition.java

@@ -35,4 +35,8 @@ public WalkPosition divide(final int divisor) {
     public WalkPosition multiply(final int multiplier) {
         return new WalkPosition(x * multiplier, y * multiplier);
     }
+
+    public double getDistance(final WalkPosition position) {
+        return getDistance(position.x, position.y);
+    }
 }