Added draw ability to draw arrow on the canvas

- displayArrow() function created
- rotate() function created.
#story [14] #pair[fwy13, zwu18]

src/main/java/seng302/Controllers/RaceController.java

@@ -7,6 +7,7 @@ import javafx.scene.control.TableView;
 import javafx.scene.layout.AnchorPane;
 import javafx.scene.paint.Color;
 import javafx.scene.paint.Paint;
+import javafx.scene.transform.Rotate;
 import seng302.GraphCoordinate;
 import seng302.RaceMap;
 
@@ -46,6 +47,19 @@ public class RaceController extends Controller{
         gc.fillOval(graphCoordinate.getX(), graphCoordinate.getY(), 10, 10);
     }
 
+    public void displayArrow(GraphCoordinate coordinate, Paint paint){
+        rotate(10, 30,30);
+        gc.fillPolygon(new double[]{0, 6, 12, 8, 8, 4, 4},
+        new double[]{15, 0, 15, 15, 40, 40, 15},
+        7);
+        gc.restore();
+    }
+
+    private void rotate(double angle, double px, double py) {
+        Rotate r = new Rotate(angle, px, py);
+        gc.setTransform(r.getMxx(), r.getMyx(), r.getMxy(), r.getMyy(), r.getTx(), r.getTy());
+    }
+
     @Override
     public void initialize(URL location, ResourceBundle resources) {/*
         raceMap.widthProperty().bind(canvasBase.widthProperty());
@@ -76,5 +90,6 @@ public class RaceController extends Controller{
         displayLine(startline1, startline2, Color.GREEN);
 
         displayPoint(this.map.convertGPS(32.293771, -64.855242), Color.BLACK);
+        displayArrow(new GraphCoordinate(100, 100), Color.BLUEVIOLET);
     }
 }