ParticleEmitter : created a RadialParticleInfluencer

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9664 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/effect/influencers/RadialParticleInfluencer.java

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+/*
+ * Copyright (c) 2009-2012 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.effect.influencers;
+
+import com.jme3.effect.Particle;
+import com.jme3.export.InputCapsule;
+import com.jme3.export.JmeExporter;
+import com.jme3.export.JmeImporter;
+import com.jme3.export.OutputCapsule;
+import com.jme3.math.FastMath;
+import com.jme3.math.Vector3f;
+import java.io.IOException;
+
+/**
+ * an influencer to make blasts expanding on the ground. can be used for various other things
+ * @author Nehon
+ */
+public class RadialParticleInfluencer extends DefaultParticleInfluencer {
+
+    private float radialVelocity = 0f;
+    private Vector3f origin = new Vector3f(0, 0, 0);
+    private boolean horizontal = false;
+
+    /**
+     * This method applies the variation to the particle with already set velocity.
+     * @param particle
+     *        the particle to be affected
+     */
+    @Override
+    protected void applyVelocityVariation(Particle particle) {
+        particle.velocity.set(initialVelocity);
+        temp.set(particle.position).subtractLocal(origin).normalizeLocal().multLocal(radialVelocity);
+        if (horizontal) {
+            temp.y = 0;
+        }
+        particle.velocity.addLocal(temp);
+
+        temp.set(FastMath.nextRandomFloat(), FastMath.nextRandomFloat(), FastMath.nextRandomFloat());
+        temp.multLocal(2f);
+        temp.subtractLocal(1f, 1f, 1f);
+        temp.multLocal(initialVelocity.length());
+        particle.velocity.interpolate(temp, velocityVariation);
+    }
+
+    /**
+     * the origin used for computing the radial velocity direction
+     * @return the origin
+     */
+    public Vector3f getOrigin() {
+        return origin;
+    }
+
+    /**
+     * the origin used for computing the radial velocity direction
+     * @param origin 
+     */
+    public void setOrigin(Vector3f origin) {
+        this.origin = origin;
+    }
+
+    /**
+     * the radial velocity
+     * @return radialVelocity
+     */
+    public float getRadialVelocity() {
+        return radialVelocity;
+    }
+
+    /**
+     * the radial velocity
+     * @param radialVelocity 
+     */
+    public void setRadialVelocity(float radialVelocity) {
+        this.radialVelocity = radialVelocity;
+    }
+
+    /**
+     * nullify y component of particle velocity to make the effect expand only on x and z axis
+     * @return 
+     */
+    public boolean isHorizontal() {
+        return horizontal;
+    }
+
+    /**
+     * nullify y component of particle velocity to make the effect expand only on x and z axis
+     * @param horizontal 
+     */
+    public void setHorizontal(boolean horizontal) {
+        this.horizontal = horizontal;
+    }
+
+    @Override
+    public void write(JmeExporter ex) throws IOException {
+        super.write(ex);
+        OutputCapsule oc = ex.getCapsule(this);
+        oc.write(radialVelocity, "radialVelocity", 0f);
+        oc.write(origin, "origin", new Vector3f());
+        oc.write(horizontal, "horizontal", false);
+    }
+
+    @Override
+    public void read(JmeImporter im) throws IOException {
+        super.read(im);
+        InputCapsule ic = im.getCapsule(this);
+        radialVelocity = ic.readFloat("radialVelocity", 0f);
+        origin = (Vector3f) ic.readSavable("origin", new Vector3f());
+        horizontal = ic.readBoolean("horizontal", false);
+    }
+}