Added a function to draw boat on canvas

#story[377]

src/main/java/seng302/controllers/CanvasController.java

@@ -1,9 +1,16 @@
 package seng302.controllers;
 
+import javafx.animation.AnimationTimer;
+import javafx.animation.KeyFrame;
+import javafx.animation.KeyValue;
+import javafx.animation.Timeline;
+import javafx.beans.property.DoubleProperty;
+import javafx.beans.property.SimpleDoubleProperty;
 import javafx.fxml.FXML;
 import javafx.scene.canvas.Canvas;
 import javafx.scene.canvas.GraphicsContext;
 import javafx.scene.paint.Color;
+import javafx.util.Duration;
 
 /**
  * Created by ptg19 on 15/03/17.
@@ -13,7 +20,18 @@ public class CanvasController {
 
     public void initialize() {
         GraphicsContext gc = canvas.getGraphicsContext2D();
-        gc.setFill(Color.GREEN);
-        gc.fillOval(100, 200, 100, 80);
+
+        drawBoat(gc, 0, 0, Color.GREEN);
+        drawBoat(gc, 100, 100, Color.BLUE);
+        drawBoat(gc, 32.296577, -64.854304, Color.RED);
+        drawBoat(gc, 32.293771 , -64.855242, Color.RED);
+    }
+
+    private void drawBoat(GraphicsContext gc, double x, double y, Color color) {
+        x += 180;  // to prevent negative longtitude
+        y += 90;  // to prevent negative latitude
+        int diameter = 10;
+        gc.setFill(color);
+        gc.fillOval(x, y, diameter, diameter);
     }
 }