Layer.cs

Siirry tämän tiedoston dokumentaatioon.

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using Microsoft.Xna.Framework;
using Jypeli.Effects;
 
 
namespace Jypeli
{
    public enum DrawOrder
    {
        Irrelevant,
 
        FirstToLast,
    }
 
 
    public class Layer : Updatable
    {
        static readonly Vector[] squareVertices =
        {
            new Vector( -0.5, -0.5 ),
            new Vector( -0.5, 0.5 ),
            new Vector( 0.5, -0.5 ),
            new Vector( 0.5, 0.5 )
        };
 
        static readonly Int16[] squareIndices =
        {
            0, 1, 2,
            2, 1, 3
        };
 
        static readonly Vector[] triangleVertices =
        {
            new Vector( 0f, 0.5f ),
            new Vector( 0.5f, -0.5f ),
            new Vector( -0.5f, -0.5f ),
        };
 
        static readonly Int16[] triangleIndices = { 0, 1, 2 };
 
        static readonly TextureCoordinates defaultCoords = new TextureCoordinates()
        {
            TopLeft = new Vector2( 0.0f, 0.0f ),
            TopRight = new Vector2( 1.0f, 0.0f ),
            BottomLeft = new Vector2( 0.0f, 1.0f ),
            BottomRight = new Vector2( 1.0f, 1.0f ),
        };
 
        public SynchronousList<IGameObject> Objects = new SynchronousList<IGameObject>();
 
        public SynchronousList<ParticleSystem> Effects = new SynchronousList<ParticleSystem>();
 
        private List<IGameObject> objectsWithImage = new List<IGameObject>();
        private List<IGameObject> objectsWithoutImage = new List<IGameObject>();
        private List<IGameObject> objectsWithDrawMethod = new List<IGameObject>();
 
        private Vector _relativeTransition = new Vector( 1, 1 );
 
        public bool IsUpdated
        {
            get { return true; }
        }
 
        public DrawOrder DrawOrder { get; set; }
 
        public Vector RelativeTransition
        {
            get { return _relativeTransition; }
            set { _relativeTransition = value; }
        }
 
        public bool IgnoresZoom { get; set; }
 
        public Grid Grid { get; set; }
 
        public Layer()
        {
            DrawOrder = DrawOrder.Irrelevant;
            Objects.ItemAdded += ObjectAdded;
            Objects.ItemRemoved += ObjectRemoved;
        }
 
        public static Layer CreateStaticLayer()
        {
            return new Layer() { RelativeTransition = Vector.Zero, IgnoresZoom = true };
        }
 
        private void ObjectAdded( IGameObject obj )
        {
            if (obj is ParticleSystem)
            {
                Effects.Add((ParticleSystem)obj);
            }
            else
            if (obj is CustomDrawable)
            {
                objectsWithDrawMethod.Add(obj);
            }
            else if (obj.Image != null)
            {
                objectsWithImage.Add(obj);
            }
            else
            {
                objectsWithoutImage.Add(obj);
            }
 
            ( (IGameObjectInternal)obj ).Layer = this;
        }
 
        private void ObjectRemoved( IGameObject obj )
        {
            if (obj is ParticleSystem)
            {
                Effects.Remove((ParticleSystem)obj);
            }
            else
            {
                objectsWithDrawMethod.Remove(obj);
                objectsWithImage.Remove(obj);
                objectsWithoutImage.Remove(obj);
            }
 
            ((IGameObjectInternal)obj).Layer = null;
        }
 
        internal void Add( IGameObject o )
        {
            Objects.Add( o );
        }
 
        internal void Remove( IGameObject o )
        {
            Objects.Remove( o );
        }
 
        public void Clear()
        {
            Effects.Clear();
            Objects.Clear();
            objectsWithImage.Clear();
            objectsWithoutImage.Clear();
            objectsWithDrawMethod.Clear();
        }
 
        public void ApplyChanges()
        {
            Effects.UpdateChanges();
            Objects.UpdateChanges();
        }
 
        public void Update( Time time )
        {
            Objects.Update( time );
            Effects.Update(time);
        }
 
        internal void Draw( Camera camera )
        {
            var zoomMatrix = IgnoresZoom ? Matrix.Identity : Matrix.CreateScale( (float)( camera.ZoomFactor ), (float)( camera.ZoomFactor ), 1f );
            var worldMatrix =
                Matrix.CreateTranslation( (float)( -camera.Position.X * RelativeTransition.X ), (float)( -camera.Position.Y * RelativeTransition.Y ), 0 )
                * zoomMatrix;
 
            switch ( DrawOrder )
            {
                case DrawOrder.Irrelevant:
                    DrawEfficientlyInNoParticularOrder( ref worldMatrix );
                    break;
                case DrawOrder.FirstToLast:
                    DrawInOrderFromFirstToLast( ref worldMatrix );
                    break;
                default:
                    break;
            }
 
            Effects.ForEach( e => e.Draw(worldMatrix) );
 
            if ( Grid != null )
            {
                DrawGrid( ref worldMatrix );
            }
        }
 
        private void DrawGrid( ref Matrix matrix )
        {
            Graphics.LineBatch.Begin( ref matrix );
 
            var camera = Game.Instance.Camera;
            var screen = Game.Screen;
            Vector topLeft = camera.ScreenToWorld( new Vector( screen.Left, screen.Top ) );
            Vector topRight = camera.ScreenToWorld( new Vector( screen.Right, screen.Top ) );
            Vector bottomLeft = camera.ScreenToWorld( new Vector( screen.Left, screen.Bottom ) );
            Vector bottomRight = camera.ScreenToWorld( new Vector( screen.Right, screen.Bottom ) );
 
            int horizontalCount = (int)Math.Ceiling( ( topRight.X - topLeft.X ) / Grid.CellSize.X );
            int leftmostLine = (int)Math.Ceiling( topLeft.X / Grid.CellSize.X );
            double leftmostX = leftmostLine * Grid.CellSize.X;
 
            for ( int i = 0; i < horizontalCount; i++ )
            {
                double x = leftmostX + i * Grid.CellSize.X;
                Vector startPoint = new Vector( x, topLeft.Y );
                Vector endPoint = new Vector( x, bottomLeft.Y );
                Graphics.LineBatch.Draw( startPoint, endPoint, Grid.Color );
            }
 
            int verticalCount = (int)Math.Ceiling( ( topRight.Y - bottomRight.Y ) / Grid.CellSize.Y );
            int bottommostLine = (int)Math.Ceiling( bottomRight.Y / Grid.CellSize.Y );
            double bottommostY = bottommostLine * Grid.CellSize.Y;
 
            for ( int i = 0; i < verticalCount; i++ )
            {
                double y = bottommostY + i * Grid.CellSize.Y;
 
                // Doesn't draw the line when y is 0! Wonder why...
                if ( y == 0.0 ) y += 0.1;
 
                Vector startPoint = new Vector( bottomLeft.X, y );
                Vector endPoint = new Vector( bottomRight.X, y );
                Graphics.LineBatch.Draw( startPoint, endPoint, Grid.Color );
            }
 
            Graphics.LineBatch.End();
        }
 
        private void DrawInOrderFromFirstToLast( ref Matrix worldMatrix )
        {
            Renderer.LightingEnabled = true;
 
            foreach ( var o in Objects )
            {
                if (o is CustomDrawable)
                {
                    if (o.IsVisible) ((CustomDrawable)o).Draw(worldMatrix);
                }
                else
                {
                    Renderer.LightingEnabled = !o.IgnoresLighting;
                    Draw(o, ref worldMatrix);
                }
            }
 
            DrawChildObjects( worldMatrix );
 
            Renderer.LightingEnabled = false;
        }
 
        int CompareByImageReference( IGameObject o1, IGameObject o2 )
        {
            if ( o1.Image == null || o2.Image == null ) return 0;
 
            int hash1 = RuntimeHelpers.GetHashCode( o1.Image );
            int hash2 = RuntimeHelpers.GetHashCode( o2.Image );
 
            if ( hash1 == hash2 )
            {
                // Because the sorting algorithm of the List class is not stable,
                // objects with similar images on top of each other flicker rather
                // annoyingly. Therefore, compare object references in order to keep
                // the sorting stable.
                return RuntimeHelpers.GetHashCode( o1 ) - RuntimeHelpers.GetHashCode( o2 );
            }
            return hash1 - hash2;
        }
 
        private void DrawEfficientlyInNoParticularOrder( ref Matrix worldMatrix )
        {
            Renderer.LightingEnabled = true;
            DrawObjectsWithoutImages( worldMatrix );
            DrawObjectsWithImages( worldMatrix );
            DrawCustomDrawables( worldMatrix );
            DrawChildObjects( worldMatrix );
            Renderer.LightingEnabled = false;
        }
 
        private void DrawObjectsWithoutImages( Matrix worldMatrix )
        {
            Graphics.ShapeBatch.Begin( ref worldMatrix );
            foreach ( var o in objectsWithoutImage )
            {
                if ( !o.IsVisible || !Game.Instance.IsObjectOnScreen(o) )
                    continue;
 
                bool hasChildObjects = o.ObjectCount > 0;
                bool isSimple = !hasChildObjects && !o.TextureFillsShape;
 
                Renderer.LightingEnabled = !o.IgnoresLighting;
 
                if ( isSimple && ( o.Image == null ) && ( o.Shape == Shape.Rectangle || o.Shape == Shape.Triangle ) )
                {
                    DrawShape( o, ref worldMatrix );
                }
                else
                {
                    Draw( o, ref worldMatrix );
                }
            }
            Graphics.ShapeBatch.End();
        }
 
        private void DrawObjectsWithImages( Matrix worldMatrix )
        {
            // By sorting the images first, we get objects with same
            // images in succession. This allows us to use the ImageBatch
            // class more efficiently.
            objectsWithImage.Sort( CompareByImageReference );
 
            // Passing null for image here does not hurt, because the first
            // ReferenceEquals-comparison calls End() without drawing a single
            // image.
            Graphics.ImageBatch.Begin( ref worldMatrix, null );
 
            Image previousImage = null;
 
            foreach ( var o in objectsWithImage )
            {
                if ( !o.IsVisible || !Game.Instance.IsObjectOnScreen(o) )
                    continue;
 
                bool hasChildObjects = o.ObjectCount > 0;
                bool isSimple = !hasChildObjects && !o.TextureFillsShape;
 
                Renderer.LightingEnabled = !o.IgnoresLighting;
 
                if ( isSimple && ( o.Image != null ) )
                {
                    if ( !Object.ReferenceEquals( o.Image, previousImage ) )
                    {
                        // Object o has different image than the previous one,
                        // so let's start a new batch with the new image. The objects
                        // should be sorted at this point.
                        Graphics.ImageBatch.End();
                        Graphics.ImageBatch.Begin( ref worldMatrix, o.Image.XNATexture );
                        previousImage = o.Image;
                    }
                    DrawTexture( o, ref worldMatrix );
                }
                else
                {
                    Draw( o, ref worldMatrix );
                }
            }
 
            Graphics.ImageBatch.End();
        }
 
        private void DrawCustomDrawables( Matrix worldMatrix )
        {
            foreach ( CustomDrawable o in objectsWithDrawMethod )
            {
                if ( o.IsVisible )
                    o.Draw( worldMatrix );
            }
        }
 
        private void DrawChildObjects( Matrix worldMatrix )
        {
            Vector drawScale = new Vector( 1, 1 );
 
            for ( int i = 0; i < Objects.Count; i++ )
            {
                var go = Objects[i] as GameObject;
                if ( go == null || go._childObjects == null || go is Window )
                    continue;
 
                if ( go.Shape.IsUnitSize )
                    drawScale = go.Size;
 
                // recursively draw children, their children and so on.
                drawChildren(go._childObjects);
 
                void drawChildren(SynchronousList<GameObject> children){
                    for (int j = 0; j < children.Count; j++)
                    {
                        GameObject go = children[j];
                        Draw(go, ref worldMatrix);
                        if (go._childObjects != null) drawChildren(go._childObjects);
                        
                    }
                }
            }
        }
 
        private void DrawTexture( IGameObject o, ref Matrix parentTransformation )
        {
            Vector2 position = new Vector2( (float)o.Position.X, (float)o.Position.Y );
            Vector2 scale = new Vector2( (float)o.Size.X, (float)o.Size.Y );
            float rotation = o.RotateImage ? (float)o.Angle.Radians : 0;
 
            if ( o.IsVisible )
            {
                if ( o.TextureWrapSize == Vector.Diagonal )
                {
                    Graphics.ImageBatch.Draw( defaultCoords, position, scale, rotation );
                }
                else
                {
                    float wx = (float)( Math.Sign( o.TextureWrapSize.X ) );
                    float wy = (float)( Math.Sign( o.TextureWrapSize.Y ) );
                    float left = (float)( -wx / 2 + 0.5 );
                    float right = (float)( wx / 2 + 0.5 );
                    float top = (float)( -wy / 2 + 0.5 );
                    float bottom = (float)( wy / 2 + 0.5 );
 
                    TextureCoordinates customCoords = new TextureCoordinates()
                    {
                        TopLeft = new Vector2( left, top ),
                        TopRight = new Vector2( right, top ),
                        BottomLeft = new Vector2( left, bottom ),
                        BottomRight = new Vector2( right, bottom ),
                    };
 
                    if ( o.TextureWrapSize.X == wx && o.TextureWrapSize.Y == wy )
                    {
                        // Draw only once
                        Graphics.ImageBatch.Draw( customCoords, position, scale, rotation );
                        return;
                    }
 
                    float topLeftX = -(float)( o.TextureWrapSize.X - 1 ) / 2;
                    float topLeftY = -(float)( o.TextureWrapSize.Y - 1 ) / 2;
 
                    Vector2 newScale = new Vector2(
                        scale.X / ( wx * (float)o.TextureWrapSize.X ),
                        scale.Y / ( wy * (float)o.TextureWrapSize.Y ) );
 
                    for ( int y = 0; y < o.TextureWrapSize.Y; y++ )
                    {
                        for ( int x = 0; x < o.TextureWrapSize.X; x++ )
                        {
                            Vector2 newPosition = position + new Vector2( ( topLeftX + x ) * newScale.X, ( topLeftY + y ) * newScale.Y );
                            Graphics.ImageBatch.Draw( customCoords, newPosition, newScale, rotation );
                        }
                    }
                }
            }
        }
 
        private void DrawShape( IGameObject o, ref Matrix parentTransformation )
        {
            Vector2 position = new Vector2( (float)o.Position.X, (float)o.Position.Y );
            Vector2 scale = new Vector2( (float)o.Size.X, (float)o.Size.Y );
            float rotation = (float)o.Angle.Radians;
 
            if ( o.IsVisible )
            {
                Vector[] vertices;
                Int16[] indices;
 
                if ( o.Shape == Shape.Rectangle )
                {
                    vertices = squareVertices;
                    indices = squareIndices;
                }
                else if ( o.Shape == Shape.Triangle )
                {
                    vertices = triangleVertices;
                    indices = triangleIndices;
                }
                else
                {
                    vertices = new Vector[] { };
                    indices = new Int16[] { };
                }
 
                Graphics.ShapeBatch.Draw( vertices, indices, o.Color, position, scale, rotation );
            }
        }
 
        private void Draw( IGameObject o, ref Matrix parentTransformation )
        {
            Vector drawScale = new Vector( 1, 1 );
            if ( o.Shape.IsUnitSize )
                drawScale = o.Size;
 
            Vector2 position = new Vector2( (float)o.Position.X, (float)o.Position.Y );
            Vector2 scale = new Vector2( (float)drawScale.X, (float)drawScale.Y );
            float rotation = o.RotateImage ? (float)o.Angle.Radians : 0;
 
            if ( o.IsVisible )
            {
                Matrix transformation =
                    Matrix.CreateScale( scale.X, scale.Y, 1f )
                    * Matrix.CreateRotationZ( rotation )
                    * Matrix.CreateTranslation( position.X, position.Y, 0f )
                    * parentTransformation;
 
                if ( o is CustomDrawable )
                {
                    ( (CustomDrawable)o ).Draw( parentTransformation );
                }
                else if ( o.Image != null && ( !o.TextureFillsShape ) )
                {
                    Renderer.DrawImage( o.Image, ref transformation, o.TextureWrapSize );
                }
                else if ( o.Image != null )
                {
                    Renderer.DrawShape( o.Shape, ref transformation, ref transformation, o.Image, o.TextureWrapSize, o.Color );
                }
                else
                {
                    Renderer.DrawShape( o.Shape, ref transformation, o.Color );
                }
            }
        }
 
        internal void GetObjectsAboutToBeAdded( List<IGameObject> result )
        {
            result.AddRange( Objects.GetObjectsAboutToBeAdded() );
        }
    }
}