1 files changed, 246 insertions, 0 deletions
diff --git a/core/src/ch/asynk/gdx/boardgame/animations/ShellFireAnimation.java b/core/src/ch/asynk/gdx/boardgame/animations/ShellFireAnimation.java
new file mode 100644
index 0000000..e2f0f59
--- /dev/null
+++ b/core/src/ch/asynk/gdx/boardgame/animations/ShellFireAnimation.java
@@ -0,0 +1,246 @@
+package ch.asynk.gdx.boardgame.animations;
+
+import java.util.Hashtable;
+import java.util.Map;
+import java.util.Random;
+
+import com.badlogic.gdx.utils.Pool;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.TextureRegion;
+import com.badlogic.gdx.math.Vector2;
+import com.badlogic.gdx.math.MathUtils;
+
+import ch.asynk.gdx.boardgame.FramedSprite;
+import ch.asynk.gdx.boardgame.Piece;
+
+public class ShellFireAnimation extends TimedAnimation implements Pool.Poolable
+{
+    private static class Config
+    {
+        public float maxFireDelay;
+        public float maxShootScattering;
+        public float shellSpeed;
+        public float smokeDuration;
+        public float explosionDuration;
+        public FramedSprite shellSprites;
+        public FramedSprite explosionSprites;
+        public Config(float maxFireDelay, float maxShootScattering, float shellSpeed,
+                float smokeDuration, float explosionDuration, FramedSprite shellSprites, FramedSprite explosionSprites)
+        {
+            this.maxFireDelay = maxFireDelay;
+            this.maxShootScattering = maxShootScattering;
+            this.shellSpeed = shellSpeed;
+            this.smokeDuration = smokeDuration;
+            this.explosionDuration = explosionDuration;
+            this.shellSprites = shellSprites;
+            this.explosionSprites = explosionSprites;
+        }
+    }
+
+    private static Map<String, Config> configs = new Hashtable<String, Config>();
+
+    public static void register(final String name,
+            float maxFireDelay,
+            float maxShootScattering,
+            float shellSpeed,
+            float smokeDuration,
+            float explosionDuration,
+            final Texture shellTexture, int shellC, int shellR,
+            final Texture explosionTexture, int explosionC, int explosionR
+            )
+    {
+        Config cfg = new Config(maxFireDelay, maxShootScattering, shellSpeed, smokeDuration, explosionDuration,
+                new FramedSprite(shellTexture, shellC, shellR),
+                new FramedSprite(explosionTexture, explosionC, explosionR)
+                );
+        configs.put(name, cfg);
+    }
+
+    public static void free()
+    {
+        // for(String key : configs.keySet()) {
+        //     Config cfg = configs.get(key);
+        // }
+        configs.clear();
+    }
+
+    private static Random random = new Random();
+
+    private static final Pool<ShellFireAnimation> shellFireAnimationPool = new Pool<ShellFireAnimation>()
+    {
+        @Override protected ShellFireAnimation newObject()
+        {
+            return new ShellFireAnimation();
+        }
+    };
+
+    public static Vector2 sv = new Vector2();
+    public static Vector2 tv = new Vector2();
+    public static ShellFireAnimation obtain(final String configName, Piece shooter, Piece target)
+    {
+        shooter.getShootingPoint(sv, target);
+        target.getImpactPoint(tv);
+        return obtain(configName, sv.x, sv.y, tv.x, tv.y);
+    }
+
+    public static ShellFireAnimation obtain(final String configName, float x0, float y0, float x1, float y1)
+    {
+        ShellFireAnimation a = shellFireAnimationPool.obtain();
+
+        Config cfg = configs.get(configName);
+        if (cfg == null) {
+            throw new RuntimeException(String.format("ShellFireAnimation : no configuration named : '%s'", configName));
+        }
+        a.cfg = cfg;
+        a.compute(x0, y0, x1, y1);
+
+        return a;
+    }
+
+    private Config cfg;
+
+    private boolean fired;
+    private boolean hit;
+    private boolean drawFire;
+    private boolean drawExplosion;
+    private float fireTime;
+    private float hitTime;
+    private float smokeEndTime;
+    private float explosionEndTime;
+
+    private TextureRegion fireRegion;
+    private float fireX;
+    private float fireY;
+    private float fireA;
+    private float fireW;
+    private float fireDx;
+    private float fireDy;
+    private float fireDw;
+
+    private int smokeFrame;
+    private float smokeDf;
+
+    private int explosionStart;
+    private int explosionFrame;
+    private float explosionX;
+    private float explosionY;
+    private float explosionDf;
+
+    private ShellFireAnimation()
+    {
+    }
+
+    @Override public void dispose()
+    {
+        shellFireAnimationPool.free(this);
+    }
+
+    private void compute(float x0, float y0, float x1, float y1)
+    {
+        // scattering
+        x1 = (x1 + (random.nextFloat() * cfg.maxShootScattering) - (cfg.maxShootScattering / 2f));
+        y1 = (y1 + (random.nextFloat() * cfg.maxShootScattering) -  (cfg.maxShootScattering / 2f));
+
+        // geometry
+        float dx = (x1 - x0);
+        float dy = (y1 - y0);
+        float a = (float) (MathUtils.atan2(y0 - y1, x0 - x1)) * MathUtils.radiansToDegrees;
+        float w = (float) Math.sqrt((dx * dx) + (dy * dy));
+
+        // timing
+        float fireDuration = (w / cfg.shellSpeed);
+        float smokeDuration = cfg.smokeDuration;
+        float explosionDuration = cfg.explosionDuration;
+        this.fireTime = (random.nextFloat() * cfg.maxFireDelay);
+        this.hitTime = this.fireTime + fireDuration;
+        this.smokeEndTime = this.hitTime + smokeDuration;
+        this.explosionEndTime = this.hitTime + explosionDuration;
+        float endTime = (this.smokeEndTime > this.explosionEndTime ? this.smokeEndTime : this.explosionEndTime);
+
+        // fire vars
+        this.fireX = x0;
+        this.fireY = y0;
+        this.fireA = a;
+        this.fireW = 0f;
+        this.fireDw = (w  / fireDuration);
+        this.fireDx = (dx / fireDuration);
+        this.fireDy = (dy / fireDuration);
+        this.fireRegion = new TextureRegion(cfg.shellSprites.frames[0]);
+
+        // smoke vars
+        this.smokeFrame = 0;
+        this.smokeDf = (cfg.shellSprites.rows / smokeDuration);
+
+        // explosion vars
+        this.explosionX = (x1 - (cfg.explosionSprites.width / 2.0f));
+        this.explosionY = (y1 - (cfg.explosionSprites.height / 2.0f));
+        this.explosionDf = (cfg.explosionSprites.cols / explosionDuration);
+        this.explosionStart = (random.nextInt(cfg.explosionSprites.rows) * cfg.explosionSprites.cols);
+        this.explosionFrame = this.explosionStart;
+
+        this.fired = false;
+        this.hit = false;
+        this.drawFire = false;
+        this.drawExplosion = false;
+        setDuration(endTime);
+    }
+
+    @Override public void begin() { }
+    @Override public void end() { }
+
+    @Override public void update(float delta)
+    {
+        if (!fired && (elapsed < fireTime)) {
+            return;
+        }
+
+        if (!fired) {
+            fired = true;
+            drawFire = true;
+        }
+
+        if (!hit && (elapsed < hitTime)) {
+            fireW += (fireDw * delta);
+            fireX += (fireDx * delta);
+            fireY += (fireDy * delta);
+            fireRegion.setRegionWidth((int) fireW);
+            return;
+        }
+
+        if (!hit) {
+            hit = true;
+            drawExplosion = true;
+        }
+
+        float dt = (elapsed - hitTime);
+
+        if (elapsed < smokeEndTime) {
+            int frame = (int) (dt * smokeDf);
+            if (frame != smokeFrame) {
+                smokeFrame = frame;
+                fireRegion.setRegion(cfg.shellSprites.frames[smokeFrame]);
+                fireRegion.setRegionWidth((int) fireW);
+            }
+        } else {
+            drawFire = false;
+        }
+
+        if (elapsed < explosionEndTime) {
+            explosionFrame = (explosionStart + (int) (dt * explosionDf));
+        } else {
+            drawExplosion = false;
+        }
+    }
+
+    @Override public void draw(Batch batch)
+    {
+        if (drawFire) {
+            batch.draw(fireRegion, fireX, fireY, 0, 0, fireRegion.getRegionWidth(), fireRegion.getRegionHeight(), 1f, 1f, fireA);
+        }
+
+        if (drawExplosion) {
+            batch.draw(cfg.explosionSprites.frames[explosionFrame], explosionX, explosionY);
+        }
+    }
+}