117 lines
3.9 KiB
C#
117 lines
3.9 KiB
C#
using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Content;
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using Newtonsoft.Json.Linq;
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using System.Collections.Generic;
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namespace SemiColinGames {
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public static class Sprites {
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public static Sprite Executioner;
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public static Sprite Ninja;
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public static void Load(ContentManager content) {
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Executioner = new Sprite(
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Textures.Executioner, content.LoadString("sprites/ccg/executioner_female.json"));
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Ninja = new Sprite(
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Textures.Ninja, content.LoadString("sprites/ccg/ninja_female.json"));
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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 double Duration;
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public readonly AnimationDirection Direction;
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public SpriteAnimation(int start, int end, double duration, AnimationDirection direction) {
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Start = start;
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End = end;
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Duration = duration;
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Direction = direction;
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}
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}
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struct Frame {
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public readonly Rectangle Source;
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public readonly double Duration;
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public Frame(Rectangle source, double duration) {
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Source = source;
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Duration = duration;
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}
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}
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public class Sprite {
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public readonly TextureRef Texture;
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private readonly Dictionary<string, SpriteAnimation> animations;
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private readonly List<Frame> frames;
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public Sprite(TextureRef texture, string metadataJson) {
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Texture = texture;
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animations = new Dictionary<string, SpriteAnimation>();
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JObject json = JObject.Parse(metadataJson);
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frames = new List<Frame>();
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foreach (JToken child in json.SelectToken("frames").Children()) {
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Rectangle source = new Rectangle(
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child.SelectToken("frame.x").Value<int>(),
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child.SelectToken("frame.y").Value<int>(),
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child.SelectToken("frame.w").Value<int>(),
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child.SelectToken("frame.h").Value<int>());
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double duration = child.SelectToken("duration").Value<double>() / 1000;
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frames.Add(new Frame(source, duration));
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}
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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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double duration = 0;
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for (int i = start; i <= end; i++) {
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duration += frames[i].Duration;
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}
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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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duration = duration * 2 - frames[start].Duration - frames[end].Duration;
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}
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animations[name] = new SpriteAnimation(start, end, duration, direction);
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}
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}
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public Rectangle GetTextureSource(string animationName, double time) {
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SpriteAnimation animation = animations[animationName];
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time %= animation.Duration;
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for (int i = animation.Start; i <= animation.End; i++) {
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double frameTime = frames[i].Duration;
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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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if (animation.Direction == AnimationDirection.PingPong) {
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for (int i = animation.End - 1; i > animation.Start; i--) {
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double frameTime = frames[i].Duration;
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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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}
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}
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