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