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@ -16,15 +16,22 @@ namespace SemiColinGames { |
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} |
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} |
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enum AnimationDirection { |
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Forward, |
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PingPong |
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} |
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struct SpriteAnimation { |
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public readonly int Start; |
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public readonly int End; |
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public readonly int DurationMs; |
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public readonly AnimationDirection Direction; |
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public SpriteAnimation(int start, int end, int durationMs) { |
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public SpriteAnimation(int start, int end, int durationMs, AnimationDirection direction) { |
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Start = start; |
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End = end; |
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DurationMs = durationMs; |
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Direction = direction; |
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} |
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} |
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@ -61,17 +68,25 @@ namespace SemiColinGames { |
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frames.Add(new Frame(source, durationMs)); |
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} |
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// TODO: handle ping-pong animations.
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JToken frameTags = json.SelectToken("meta.frameTags"); |
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foreach (JToken child in frameTags.Children()) { |
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string name = child.SelectToken("name").Value<string>(); |
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int start = child.SelectToken("from").Value<int>(); |
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int end = child.SelectToken("to").Value<int>(); |
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string directionString = child.SelectToken("direction").Value<string>(); |
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AnimationDirection direction = directionString == "pingpong" ? |
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AnimationDirection.PingPong: AnimationDirection.Forward; |
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int durationMs = 0; |
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for (int i = start; i <= end; i++) { |
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durationMs += frames[i].DurationMs; |
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} |
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animations[name] = new SpriteAnimation(start, end, durationMs); |
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// A PingPong animation repeats every frame but the first and last.
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// Therefore its duration is 2x, minus the duration of the first and last frames.
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if (direction == AnimationDirection.PingPong) { |
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durationMs = durationMs * 2 - frames[start].DurationMs - frames[end].DurationMs; |
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} |
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animations[name] = new SpriteAnimation(start, end, durationMs, direction); |
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} |
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} |
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@ -85,6 +100,15 @@ namespace SemiColinGames { |
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} |
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time -= frameTime; |
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} |
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if (animation.Direction == AnimationDirection.PingPong) { |
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for (int i = animation.End - 1; i > animation.Start; i--) { |
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int frameTime = frames[i].DurationMs; |
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if (time < frameTime) { |
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return frames[i].Source; |
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} |
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time -= frameTime; |
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} |
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} |
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// We shouldn't get here, but if we did, the last frame is a fine thing to return.
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return frames[animation.End].Source; |
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} |
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