Sails are displayed correctly for all wind and active boat directions.

- Figured out the different situations that can occur using accurate points of sail
- Mathed out the rotation angle for each situation
- Manual testing carried out by running simulations
- Manual testing carried out using pen and paper

#story[1098]

racevisionGame/src/main/java/visualiser/model/ResizableRaceCanvas.java

@@ -324,38 +324,54 @@ public class ResizableRaceCanvas extends ResizableCanvas {
         double yPos = boatPos.getY() - 6;   // y pos of sail (on boat)
         double boatBearing = boat.getBearing().degrees();
         double windDirection = visualiserRace.getWindDirection().degrees();
-        windDirection = 0;  // set to 0 for now - will be removed
+        double sailRotateAngle = 0; // rotation for correct sail display
-        double sailRotateAngle; // required rotation for correct sail display
+        Image sailImage = null;
-        Image sailImage;
+        Boolean rightSail = true;
-
+
-        // remove when method is finished
+        // Getting the correct Points of Sail
-        sailRotateAngle = 0;
+        if (ThisBoat.getInstance().isSailsOut()){
-        sailImage = null;
+            // correct sail and sailRotateAngle start depending on wind+bearing
+            if ((windDirection + 180) > 360) {
+                if ((boatBearing < windDirection) &&
+                        (boatBearing > windDirection - 180)) {
+                    rightSail = false;
+                } else {
+                    if (boatBearing < 180) {
+                        sailRotateAngle = -180;
+                    }
+                }
+            } else {
+                if (!((boatBearing > windDirection) &&
+                        (boatBearing < windDirection + 180))) {
+                    rightSail = false;
+                    if (boatBearing > 180) {
+                        sailRotateAngle = -180;
+                    }
+                }
+            }
 
-        gc.save();
+            if (rightSail) {
-        if (ThisBoat.getInstance().isSailsOut()) {
-            if (boatBearing < 180) {    // right half of points of sail
                 sailImage = sailsRight;
-                sailRotateAngle = boatBearing * 0.5;    // math
+                xPos -= 1;  // right align sail to boat edge on canvas
-                xPos -= 1;  // right align to boat edge on canvas
+            } else {
-                //            System.out.println("right side -- boat: " + boatBearing +
-                //                    "|| rotate: " + sailRotateAngle);
-            }
-            else {  // left half of points of sail
                 sailImage = sailsLeft;
-                sailRotateAngle = -(360 - boatBearing) * 0.5;   // math
+                xPos -= 5;  // left align sail to boat edge on canvas
-                xPos -= 5;  // left align to boat edge on canvas
-                //            System.out.println("left side -- boat: " + boatBearing +
-                //                    "|| rotate: " + sailRotateAngle);
             }
         }
         else {
-//            TODO: display luffing sail
+            // TODO: display luffing sail
         }
 
+        sailRotateAngle += ((boatBearing + windDirection) * 0.5);
+//        System.out.println("boat: " + boatBearing + " || rotate: " +
+//                sailRotateAngle + " || wind angle: " + windDirection);
+
+        gc.save();
+
         // rotate sails based on boats current heading
         rotate(sailRotateAngle, boatPos.getX(), boatPos.getY());
         gc.drawImage(sailImage, xPos, yPos);
+
         gc.restore();
     }