git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@2049 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.Game/Graphics/Animation.cs

@@ -0,0 +1,74 @@
+using System;
+
+namespace OpenRa.Game.Graphics
+{
+	class Animation
+	{
+		readonly string name;
+		Sequence currentSequence;
+		int frame = 0;
+		bool tickAlways;
+
+		public Animation( string name )
+		{
+			this.name = name;
+			Play( "idle" );
+		}
+
+		public Sprite[] Images { get { return new Sprite[] { currentSequence.GetSprite( frame ) }; } }
+		public float2 Center { get { return 0.25f * new float2(currentSequence.GetSprite(0).bounds.Size); } }
+
+		public void Play( string sequenceName )
+		{
+			PlayThen(sequenceName, () => { });
+		}
+
+		public void PlayRepeating( string sequenceName )
+		{
+			PlayThen( sequenceName, () => PlayRepeating( sequenceName ) );
+		}
+
+		public void PlayThen( string sequenceName, Action after )
+		{
+			tickAlways = false;
+			currentSequence = SequenceProvider.GetSequence( name, sequenceName );
+			frame = 0;
+			tickFunc = () =>
+			{
+				++frame;
+				if( frame >= currentSequence.Length )
+				{
+					frame = currentSequence.Length - 1;
+					tickFunc = () => { };
+					after();
+				}
+			};
+		}
+
+		public void PlayFetchIndex( string sequenceName, Func<int> func )
+		{
+			tickAlways = true;
+			currentSequence = SequenceProvider.GetSequence( name, sequenceName );
+			frame = func();
+			tickFunc = () => frame = func();
+		}
+
+		int timeUntilNextFrame;
+		Action tickFunc;
+
+		public void Tick( int t )
+		{
+			if( tickAlways )
+				tickFunc();
+			else
+			{
+				timeUntilNextFrame -= t;
+				while( timeUntilNextFrame <= 0 )
+				{
+					tickFunc();
+					timeUntilNextFrame += 40; // 25 fps == 40 ms
+				}
+			}
+		}
+	}
+}