/// <summary>
/// Creates and initializes the main menu.
/// </summary>
/// <param name="sb">The <see cref="SpriteBatch"/> to render to.</param>
public MainMenu(SpriteBatch sb)
: base(sb, Color.Lime)
{
Name = "MainMenu";
//TextureFactory: Creates textures at runtime
TextureFactory factory = new TextureFactory(sb.GraphicsDevice);
//Sprite: A simple bitmap image, with convenient methods and properties
//Yet it has so many possibilities...
//Here it is used as a mouse cursor
//Star image courtesy of Wikimedia user Felipe Micaroni Lalli
//Image obtained from http://commons.wikimedia.org/wiki/File:Star_Ouro.svg
mouseCursor = new Sprite(GLibXNASampleGame.Instance.Content.Load <Texture2D>("Star"), Vector2.Zero, sb);
mouseCursor.Scale = new Vector2(.1f);
mouseCursor.UseCenterAsOrigin = true;
//OverlayImage overlays the second image onto the first (not in place)
Texture2D imageOverlay = factory.CreateSquare(15, Color.DarkGray * 0.65F);
TextureFactory.OverlayImage(imageOverlay, factory.CreateSquare(11, Color.Black * 0.75F), new Point(2, 2));
TextureFactory.OverlayImage(imageOverlay, factory.CreateSquare(7, Color.DarkOrange * 0.85F), new Point(4, 4));
TextureFactory.OverlayImage(imageOverlay, factory.CreateSquare(3, Color.DarkRed * 0.95F), new Point(6, 6));
fadingImage = new Sprite(imageOverlay, Vector2.Zero, sb);
fadingImage.Position = new Vector2(15, 25);
//The CreateFade method creates an array of textures, each one closer to the final texture than the last
//It is used for fades
Texture2D finalFadeImage = factory.CreateRectangle(fadingImage.Texture.Width, fadingImage.Texture.Height, Color.Red);
TextureFactory.OverlayImage(finalFadeImage, factory.CreateHollowRectangle(fadingImage.Texture.Width - 4, fadingImage.Texture.Height - 4, Color.DarkRed), new Point(2, 2));
fades = TextureFactory.CreateFade(fadingImage.Texture, finalFadeImage, 300);
mouseBoundingBox = new Sprite(factory.CreateHollowCircle((mouseCursor.Width / 2).Round(), Color.Navy), mouseCursor.Position, sb)
{
UseCenterAsOrigin = true
};
//TextSprite: Displays text
//Can be used for titles, descriptions, etc
title = new TextSprite(sb, GLibXNASampleGame.Instance.Content.Load <SpriteFont>("Title"), "GlenLibrary XNA");
//Extension method: GetCenterPosition: Returns the position required to center the object on the specified viewport
title.Position = new Vector2(title.GetCenterPosition(sb.GraphicsDevice.Viewport).X, 15);
//Fancy color constructor: Uses a Vector4 with RGBA values expressed as floats from 0 to 1, basically dark gray shadow with 128 alpha
title.Shadow = new TextShadow(title, new Vector2(-2, 2), new Color(new Vector4(Color.DarkGray.ToVector3(), 0.5f)));
AdditionalSprites.Add(title);
desc = new TextSprite(sb, GLibXNASampleGame.Instance.Content.Load <SpriteFont>("Subtitle"), "A general purpose XNA library", Color.Chocolate);
desc.Color *= 0.75f;
desc.Color.A = 255;
desc.X = desc.GetCenterPosition(Graphics.Viewport).X;
desc.Y = title.Y + title.Height + 5;
AdditionalSprites.Add(desc);
//Add items to the buttons dictionary
buttons.Add("Video Player", "VideoPlayer");
buttons.Add("Multiplayer", "MultiPlayer");
buttons.Add("Animated Sprite", "AnimatedScreen");
#region Generation of buttons systematically
float yCoord = desc.Y + desc.Height + 10;
foreach (var element in buttons)
{
Sprite buttonSprite = new Sprite(GLibXNASampleGame.Instance.TextureCreator.CreateSquare(1, Color.Red), Vector2.Zero, sb);
TextSprite button = new TextSprite(sb, GLibXNASampleGame.Instance.Content.Load <SpriteFont>("MenuItem"), element.Key);
//Allows hovering (and therefore clicking) on a sprite
button.IsHoverable = true;
// These are the colors that are displayed at the various hovering states
button.HoverColor = Color.DarkCyan;
button.NonHoverColor = Color.Black;
// "Pressed" event handler lambda expression
button.Pressed += (src, args) => GLibXNASampleGame.Instance.SetScreen(buttons[((TextSprite)src).Text]);
// Setting width and height on a Sprite scales it
buttonSprite.Width = button.Width + 6;
buttonSprite.Height = button.Height + 4;
buttonSprite.Position = new Vector2(buttonSprite.GetCenterPosition(sb.GraphicsDevice.Viewport).X, yCoord);
// ParentSprite: Allows for a "button" behind a clickable TextSprite (or not clickable), all collision and position logic done with this sprite
button.ParentSprite = buttonSprite;
// Round to look better
button.Scale.X = button.Scale.X.Round();
button.Scale.Y = button.Scale.Y.Round();
button.X = button.X.Round();
button.Y = button.Y.Round();
Sprites.Add(buttonSprite);
AdditionalSprites.Add(button);
yCoord += buttonSprite.Height;
yCoord += 7.5f;
yCoord = yCoord.Round();
}
#endregion
// ProgressBar: A dynamically generated progress bar, could be used to represent asset loading progress
// Here it is just used for effects :-)
progressBar = new ProgressBar(Vector2.Zero, _filledColors[0], _emptyColors[0], sb);
//HeightScale: The progress bar shall be 7 pixels high
progressBar.HeightScale = 7;
progressBar.Denominator = Graphics.Viewport.Width - 20;
progressBar.Value = 0;
progressBar.X = progressBar.GetCenterPosition(sb.GraphicsDevice.Viewport).X;
progressBar.Y = Graphics.Viewport.Height - progressBar.Height - 5;
Sprites.Add(progressBar);
caption = new TextSprite(sb, GLibXNASampleGame.Instance.Content.Load <SpriteFont>("Details"), "A caption!");
caption.X = caption.GetCenterPosition(Graphics.Viewport).X;
caption.Y = progressBar.Y - caption.Height - 2;
caption.Visible = false;
AdditionalSprites.Add(caption);
// Random Particle Generator: A particle generator that uses a Random instance to set properties of the generated particles
RandomParticleGenerator particlegen = new RandomParticleGenerator(sb, GLibXNASampleGame.Instance.Content.Load <Texture2D>("Star"));
particlegen.MinimumParticleColorChangeRate = 0.925f;
particlegen.MinimumTimeToLive = TimeSpan.FromMilliseconds(400);
particlegen.MaximumTimeToLive = TimeSpan.FromMilliseconds(780);
particlegen.ParticlesToGenerate = 1;
particlegen.ScaleFactor = 15;
// TimeToLiveSettings: When to make a particle expire, binary flaggable enumerator
particlegen.TTLSettings = TimeToLiveSettings.AlphaLess100 | TimeToLiveSettings.StrictTTL;
// Particle engine: Generates particles using the specified particle generator
mouseParticleGen = new ParticleEngine(particlegen);
mouseParticleGen.FramesPerGeneration = 3;
mouseParticleGen.Tracked = mouseCursor;
AdditionalSprites.Add(mouseParticleGen);
AdditionalSprites.Add(mouseCursor);
AdditionalSprites.Add(mouseBoundingBox);
Sprites.Add(fadingImage);
}
