add animations/ShotAnimation

1 files changed, 248 insertions, 0 deletions

diff --git a/core/src/ch/asynk/tankontank/engine/gfx/animations/ShotAnimation.java b/core/src/ch/asynk/tankontank/engine/gfx/animations/ShotAnimation.java
new file mode 100644
index 0000000..930570a
--- /dev/null
+++ b/core/src/ch/asynk/tankontank/engine/gfx/animations/ShotAnimation.java
@@ -0,0 +1,248 @@
+package ch.asynk.tankontank.engine.gfx.animations;
+
+import java.util.Random;
+
+import com.badlogic.gdx.utils.Disposable;
+import com.badlogic.gdx.utils.Pool;
+
+import com.badlogic.gdx.audio.Sound;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.graphics.g2d.TextureRegion;
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+
+import ch.asynk.tankontank.engine.gfx.Drawable;
+import ch.asynk.tankontank.engine.gfx.Animation;
+
+class Sprites
+{
+    public Texture texture;
+    public TextureRegion[] frames;
+    public final int width;
+    public final int height;
+    public final int cols;
+    public final int rows;
+
+    public Sprites(Texture texture, int cols, int rows)
+    {
+        this.cols = cols;
+        this.rows = rows;
+        this.width = (texture.getWidth() / cols);
+        this.height = (texture.getHeight() / rows);
+        this.texture = texture;
+        TextureRegion[][] tmp = TextureRegion.split(texture, width, height);
+        frames = new TextureRegion[cols * rows];
+        int idx = 0;
+        for (int i = 0; i < rows; i++) {
+            for (int j = 0; j < cols; j++) {
+                frames[idx++] = tmp[i][j];
+            }
+        }
+    }
+}
+
+public class ShotAnimation implements Disposable, Animation, Pool.Poolable
+{
+    private static final float SHOT_SCATTERING = 60f;
+    private static final float TIME_SCATTERING = 0.6f;
+    private static final float SHOT_SPEED = 700f;
+    private static final float EXPLOSION_FRAME_DURATION = 0.05f;
+
+    private static Random random = new Random();
+    private static Sound sound;
+    private static Sprites shot;
+    private static Sprites explosion;
+
+    private TextureRegion shotRegion;
+    private float shot_a;
+    private float shot_x;
+    private float shot_y;
+    private float shot_w;
+    private float shot_dx;
+    private float shot_dy;
+    private float shot_dw;
+
+    private float smoke_dx;
+    private float smoke_df;
+    private int smoke_frame;
+
+    private float explosion_x;
+    private float explosion_y;
+    private float explosion_df;
+    private int explosion_frame;
+
+    private boolean fired;
+    private boolean hit;
+    private float elapsed;
+    private float fire_time;
+    private float hit_time;
+    private float end_time;
+
+    private float volume;
+    private long soundId;
+
+    private static final Pool<ShotAnimation> shotAnimationPool = new Pool<ShotAnimation>() {
+        @Override
+        protected ShotAnimation newObject() {
+            return new ShotAnimation();
+        }
+    };
+
+    public static ShotAnimation get(float volume, float offset, float x0, float y0, float x1, float y1)
+    {
+        ShotAnimation a = shotAnimationPool.obtain();
+        a.set(volume, offset, x0, y0, x1, y1);
+        return a;
+    }
+
+    public static void init(Texture shot_texture, int scols, int srows, Texture explosion_texture, int ecols, int erows, Sound snd)
+    {
+        sound = snd;
+        shot = new Sprites(shot_texture, scols, srows);
+        explosion = new Sprites(explosion_texture, ecols, erows);
+    }
+
+    public static void free()
+    {
+        sound.dispose();
+        shot.texture.dispose();
+        explosion.texture.dispose();
+    }
+
+    public ShotAnimation()
+    {
+        this.shotRegion = new TextureRegion(shot.frames[0]);
+    }
+
+    private void set(float volume, float offset, float x0, float y0, float x1, float y1)
+    {
+        this.fired = false;
+        this.hit = false;
+        this.volume = volume;
+
+        // shot geometry
+        y0 -= (shot.height / 2.0f);
+        x1 += ((SHOT_SCATTERING * random.nextFloat()) - (SHOT_SCATTERING / 2f));
+        y1 += ((SHOT_SCATTERING * random.nextFloat()) - (SHOT_SCATTERING / 2f));
+
+        double r = Math.atan2((y0 - y1), (x0 - x1));
+        float xadj = (float) (Math.cos(r) * offset);
+        float yadj = (float) (Math.sin(r) * offset);
+        x0 -= xadj;
+        y0 -= yadj;
+
+        float a = (float) Math.toDegrees(r);
+        float dx = (x1 - x0);
+        float dy = (y1 - y0);
+        float w = (float) Math.sqrt((dx * dx) + (dy * dy));
+
+        // timing
+        float delay = (random.nextFloat() * TIME_SCATTERING);
+        float shot_duration = ((random.nextFloat() * TIME_SCATTERING) + (w / SHOT_SPEED));
+        float explosion_duration = (explosion.cols * EXPLOSION_FRAME_DURATION);
+
+        this.elapsed = 0f;
+        this.fire_time = delay;
+        this.hit_time = (fire_time + shot_duration);
+        this.end_time = (hit_time + explosion_duration);
+
+        // shot vars
+        this.shot_a = a;
+        this.shot_x = x0;
+        this.shot_y = y0;
+        this.shot_w = 0;
+        this.shot_dx = (dx / shot_duration);
+        this.shot_dy = (dy / shot_duration);
+        this.shot_dw = (w  / shot_duration);
+
+        // smoke var
+        this.smoke_dx = 0f;
+        this.smoke_df = (shot.rows / explosion_duration);
+        this.smoke_frame = 0;
+
+        // explosion vars
+        this.explosion_x = (x1 - (explosion.width / 2.0f));
+        this.explosion_y = (y1 - (explosion.height / 2.0f));
+        this.explosion_df = (explosion.cols / explosion_duration);
+        this.explosion_frame = (random.nextInt(explosion.rows) * explosion.cols);
+
+        soundId = -1;
+    }
+
+    @Override
+    public void reset()
+    {
+    }
+
+    @Override
+    public void dispose()
+    {
+        shotAnimationPool.free(this);
+    }
+
+    @Override
+    public boolean animate(float delta)
+    {
+        elapsed += delta;
+
+        if (!fired && (elapsed < fire_time))
+            return false;
+
+        if (!fired) {
+            fired = true;
+            soundId = sound.play(volume);
+        }
+
+        if (!hit && (elapsed < hit_time)) {
+            shot_w += (shot_dw * delta);
+            shot_x += (shot_dx * delta);
+            shot_y += (shot_dy * delta);
+            shotRegion.setRegionWidth((int) shot_w);
+            return false;
+        }
+
+        if (!hit) {
+            hit = true;
+            // TODO hit sound
+        }
+
+        if (elapsed < end_time) {
+            int frame = (int) ((elapsed - hit_time) * smoke_df);
+            if (frame != smoke_frame) {
+                smoke_frame = frame;
+                shotRegion.setRegion(shot.frames[smoke_frame]);
+                shotRegion.setRegionWidth((int) shot_w);
+            }
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public void draw(Batch batch)
+    {
+        if (fired)
+            batch.draw(shotRegion, shot_x, shot_y, 0, 0, shotRegion.getRegionWidth(), shotRegion.getRegionHeight(), 1f, 1f, shot_a);
+
+        if (hit) {
+            int frame = (explosion_frame + (int) ((elapsed - hit_time) * explosion_df));
+            batch.draw(explosion.frames[frame], explosion_x, explosion_y);
+        }
+    }
+
+    @Override
+    public void drawDebug(ShapeRenderer debugShapes)
+    {
+        debugShapes.end();
+        debugShapes.begin(ShapeRenderer.ShapeType.Line);
+        debugShapes.identity();
+        debugShapes.translate(shot_x, shot_y, 0);
+        debugShapes.rotate(0, 0, 1, shot_a);
+        debugShapes.translate(-shot_x, -shot_y, 0);
+        debugShapes.rect(shot_x, shot_y, shot_w, shot.height);
+        debugShapes.end();
+        debugShapes.begin(ShapeRenderer.ShapeType.Line);
+        debugShapes.identity();
+    }
+}