v0.3.0: refactored beam effects, added Light Ray effect.

src/com/shatteredpixel/shatteredpixeldungeon/effects/Beam.java

@@ -0,0 +1,87 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2014  Oleg Dolya
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+package com.shatteredpixel.shatteredpixeldungeon.effects;
+
+import javax.microedition.khronos.opengles.GL10;
+
+import android.opengl.GLES20;
+
+import com.watabou.noosa.Game;
+import com.watabou.noosa.Image;
+import com.watabou.noosa.audio.Sample;
+import com.shatteredpixel.shatteredpixeldungeon.Assets;
+import com.watabou.utils.PointF;
+
+public class Beam extends Image {
+	
+	private static final double A = 180 / Math.PI;
+	
+	private  float duration;
+	
+	private float timeLeft;
+
+	private Beam(PointF s, PointF e, Effects.Type asset, float duration) {
+		super( Effects.get( asset ) );
+		
+		origin.set( 0, height / 2 );
+		
+		x = s.x - origin.x;
+		y = s.y - origin.y;
+		
+		float dx = e.x - s.x;
+		float dy = e.y - s.y;
+		angle = (float)(Math.atan2( dy, dx ) * A);
+		scale.x = (float)Math.sqrt( dx * dx + dy * dy ) / width;
+		
+		Sample.INSTANCE.play( Assets.SND_RAY );
+		
+		timeLeft = this.duration = duration;
+	}
+
+	public static class DeathRay extends Beam{
+		public DeathRay(PointF s, PointF e){
+			super(s, e, Effects.Type.DEATH_RAY, 0.5f);
+		}
+	}
+
+	public static class LightRay extends Beam{
+		public LightRay(PointF s, PointF e){
+			super(s, e, Effects.Type.LIGHT_RAY, 1f);
+		}
+	}
+	
+	@Override
+	public void update() {
+		super.update();
+		
+		float p = timeLeft / duration;
+		alpha( p );
+		scale.set( scale.x, p );
+		
+		if ((timeLeft -= Game.elapsed) <= 0) {
+			killAndErase();
+		}
+	}
+	
+	@Override
+	public void draw() {
+		GLES20.glBlendFunc( GL10.GL_SRC_ALPHA, GL10.GL_ONE );
+		super.draw();
+		GLES20.glBlendFunc( GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA );
+	}
+}