done

src/main/java/rocks/zipcode/calcskin/CalcEngine.java

@@ -20,4 +20,19 @@ public class CalcEngine {
     public double divide(double v, double v1) {
         return v/v1;
     }
+
+
+    public double sin(double v) {
+        return Math.sin(v);
+    }
+
+    public double cos(double v) {
+        return Math.cos(v);
+    }
+
+    public double tan(double v) {
+        return Math.tan(v);
+    }
+
+
 }

src/main/java/rocks/zipcode/calcskin/CalcSkin.java

@@ -27,7 +27,8 @@ public class CalcSkin extends Application {
             { "7", "8", "9", "/" },
             { "4", "5", "6", "*" },
             { "1", "2", "3", "-" },
-            { "0", "c", "=", "+" }
+            { "0", "c", "=", "+" },
+            {"sin", "cos","tan"}
     };
 
     private final Map<String, Button> accelerators = new HashMap<>();
@@ -36,7 +37,7 @@ public class CalcSkin extends Application {
     private DoubleProperty currentValue = new SimpleDoubleProperty();
     private CalcEngine calcEngine = new CalcEngine();
 
-    private enum Op { NOOP, ADD, SUBTRACT, MULTIPLY, DIVIDE }
+    private enum Op { NOOP, ADD, SUBTRACT, MULTIPLY, DIVIDE , SIN , COS, TAN}
 
     private Op curOp   = Op.NOOP;
     private Op stackOp = Op.NOOP;
@@ -60,7 +61,7 @@ public class CalcSkin extends Application {
     private VBox createLayout(TextField screen, TilePane buttons) {
         final VBox layout = new VBox(20);
         layout.setAlignment(Pos.CENTER);
-        layout.setStyle("-fx-background-color: silver; -fx-padding: 20; -fx-font-size: 20;");
+        layout.setStyle("-fx-background-color: #ff7020; -fx-padding: 20; -fx-font-size: 20;");
         layout.getChildren().setAll(screen, buttons);
         handleAccelerators(layout);
         screen.prefWidthProperty().bind(buttons.widthProperty());
@@ -81,7 +82,7 @@ public class CalcSkin extends Application {
 
     private TextField createScreen() {
         final TextField screen = new TextField();
-        screen.setStyle("-fx-background-color: aquamarine;");
+        screen.setStyle("-fx-background-color: #b6ffda;");
         screen.setAlignment(Pos.CENTER_RIGHT);
         screen.setEditable(false);
         screen.textProperty().bind(Bindings.format("%.0f", currentValue));
@@ -127,12 +128,15 @@ public class CalcSkin extends Application {
             case "-": triggerOp.set(Op.SUBTRACT); break;
             case "*": triggerOp.set(Op.MULTIPLY); break;
             case "/": triggerOp.set(Op.DIVIDE);   break;
+            case "sin": triggerOp.set(Op.SIN); break;
+            case "cos": triggerOp.set(Op.COS); break;
+            case "tan": triggerOp.set(Op.TAN); break;
         }
         return triggerOp;
     }
 
     private void makeOperandButton(Button button, final ObjectProperty<Op> triggerOp) {
-        button.setStyle("-fx-base: lightgray;");
+        button.setStyle("-fx-base: yellow;");
         button.setOnAction(new EventHandler<ActionEvent>() {
             @Override
             public void handle(ActionEvent actionEvent) {
@@ -143,7 +147,7 @@ public class CalcSkin extends Application {
 
     private Button makeStandardButton(String s) {
         Button button = new Button(s);
-        button.setStyle("-fx-base: beige;");
+        button.setStyle("-fx-base: pink;");
         accelerators.put(s, button);
         button.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
         return button;
@@ -166,7 +170,7 @@ public class CalcSkin extends Application {
     }
 
     private void makeClearButton(Button button) {
-        button.setStyle("-fx-base: mistyrose;");
+        button.setStyle("-fx-base: black;");
         button.setOnAction(new EventHandler<ActionEvent>() {
             @Override
             public void handle(ActionEvent actionEvent) {
@@ -185,6 +189,9 @@ public class CalcSkin extends Application {
                     case SUBTRACT: currentValue.set(calcEngine.subtract(previousValue.get(), currentValue.get())); break;
                     case MULTIPLY: currentValue.set(calcEngine.multiply(previousValue.get(), currentValue.get())); break;
                     case DIVIDE:   currentValue.set(calcEngine.divide(previousValue.get(), currentValue.get())); break;
+                    case SIN:   currentValue.set(calcEngine.sin(currentValue.get())); break;
+                    case COS:   currentValue.set(calcEngine.cos(currentValue.get())); break;
+                    case TAN:   currentValue.set(calcEngine.tan(currentValue.get())); break;
                 }
             }
         });