Graphical User Interfaces - Pro Unity Game Development with C# - page 261

50 //Enable/Disable input
51 GameManager.Instance.InputAllowed = !bShow;
52
53 //Show/Hide menu graphics
54 SR.enabled = bShow;
55
56 //Enable/Disable button colliders
57 foreach(BoxCollider B in Colliders)
58 B.enabled = bShow;
59 }
60 //--------------------------------------------------------------
61 //Watch escape key input
62 void Update()
63 {
64 //If escape key pressed
65 if(Input.GetKeyDown(KeyCode.Escape))
66 SetOptionsVisible(!SR.enabled);
67 }
68 //--------------------------------------------------------------
69 }
 Line 09. Features the main reference to a Sprite Renderer component for
drawing the main menu graphic to the screen. This will refer to a sprite from the
project atlas texture. The object reference is retrieved during the Start function,
at line 19.
 Line 12. Features an array of collider objects, which will be used later in the
chapter to represent clickable areas for the menu buttons. A reference to a
collider array is required to disable the colliders when the menu is hidden, to
prevent the gamer from clicking buttons when the menu is off-screen.
 Lines 45-59. The SetOptionsVisible function toggles the visibility of the menu.
Line 48 uses the TimeScale member of the native Time class to pause the game
when the menu is displayed. A TimeScale value of 1 represents normal speed,
a value of 0.5 represents half speed, and 0 means paused.
Note More information on the Time class and its TimeScale member can be found in the online Unity
documentation at http://docs.unity3d.com/Documentation/ScriptReference/Time-timeScale.html .
Let's give this class a test, along with the GUIObject class coded in the previous section. By
adding both components to a single menu object, we can create a menu that displays and hides
on the screen by pressing the Escape key. Be sure to add a sprite component to the object, too,
referencing the menu object ( spr_Menu ) in the atlas texture. You can add a sprite component to an
object manually by choosing Component ➤ Rendering ➤ Sprite Renderer from the application
menu. Then from the Object Inspector, set the Sprite field to spr_Menu (see Figure 8-5 ).