com.akjava.gwt.threetest.client.ParticleDemo.java Source code

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Here is the source code for com.akjava.gwt.threetest.client.ParticleDemo.java

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/*
 * Copyright (C) 2011 aki@akjava.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.akjava.gwt.threetest.client;

import com.akjava.gwt.three.client.THREE;
import com.akjava.gwt.three.client.cameras.Camera;
import com.akjava.gwt.three.client.core.Geometry;
import com.akjava.gwt.three.client.core.Vector3;
import com.akjava.gwt.three.client.core.Vertex;
import com.akjava.gwt.three.client.extras.ImageUtils;
import com.akjava.gwt.three.client.lights.Light;
import com.akjava.gwt.three.client.materials.Material;
import com.akjava.gwt.three.client.objects.Mesh;
import com.akjava.gwt.three.client.objects.ParticleSystem;
import com.akjava.gwt.three.client.renderers.WebGLRenderer;
import com.akjava.gwt.three.client.scenes.Scene;
import com.akjava.gwt.threetest.client.resources.Bundles;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.FocusPanel;

public class ParticleDemo extends AbstractDemo {
    private Timer timer;
    private Mesh mesh;

    //original is here
    //www.airtightinteractive.com/demos/cubes_three/
    @Override
    public void start(final WebGLRenderer renderer, final int width, final int height, FocusPanel panel) {
        if (timer != null) {
            timer.cancel();
            timer = null;
        }

        renderer.setClearColorHex(0x333333, 1);

        final Camera camera = THREE.PerspectiveCamera(35, (double) width / height, .1, 10000);
        camera.getPosition().set(0, 0, 0);

        final Scene scene = THREE.Scene();

        final Light light = THREE.SpotLight(0xffffff);
        light.setPosition(1000, 2000, 1500);//light.setPosition(5,5, 5);
        scene.add(light);

        //scene.add(THREE.AmbientLight(0x888888));

        final int pcount = 1800;
        final Geometry particles = THREE.Geometry();
        //Material material=THREE.ParticleBasicMaterial().color(0xffffff).size(20).build();
        Material material = THREE.ParticleBasicMaterial().color(0xffffff).size(20)
                .map(ImageUtils.loadTexture("img/particle.png")).blending(THREE.AdditiveBlending).transparent(true)
                .build();
        final Vector3[] velocity = new Vector3[pcount];
        for (int i = 0; i < pcount; i++) {
            int px = (int) (Math.random() * 500 - 250);
            int py = (int) (Math.random() * 500 - 250);
            int pz = (int) (Math.random() * 500 - 250);
            Vertex v = THREE.Vertex(THREE.Vector3(px, py, pz));
            particles.vertices().push(v);

            velocity[i] = THREE.Vector3(0, 0, -Math.random());
        }

        final ParticleSystem particleSystem = THREE.ParticleSystem(particles, material);
        particleSystem.setSortParticles(true);

        final Mesh root = THREE.Mesh(THREE.PlaneGeometry(500, 500),
                THREE.MeshLambertMaterial().color(0x00ee88).build());
        scene.add(root);
        mesh = root;

        mesh.add(particleSystem);

        root.setRotation(Math.toDegrees(45), Math.toDegrees(45), Math.toDegrees(-45));

        MainWidget.cameraRotation.setX(-45);
        MainWidget.cameraRotation.setZ(45);

        //   MainWidget.cameraMove.setZ(-20);
        MainWidget.cameraMove.setZ(1000);
        //   MainWidget.cameraRotation.setX(-90);
        timer = new Timer() {
            public void run() {
                MainWidget.stats.update();
                try {

                    particleSystem.getRotation().incrementZ(0.001);

                    for (int i = 0; i < pcount; i++) {
                        Vertex v = particles.vertices().get(i);
                        if (v.getPosition().getZ() < -200) {
                            v.getPosition().setZ(200);
                            velocity[i].setZ(0);
                        }

                        velocity[i].incrementZ(-Math.random() * .1);

                        v.getPosition().addSelf(velocity[i]);
                    }

                    particles.setDirtyVertices(true);//call if you move verticle

                    camera.setPosition(MainWidget.cameraMove.getX(), MainWidget.cameraMove.getY(),
                            MainWidget.cameraMove.getZ());
                    mesh.setRotation(Math.toRadians(MainWidget.cameraRotation.getX()),
                            Math.toRadians(MainWidget.cameraRotation.getY()),
                            Math.toRadians(MainWidget.cameraRotation.getZ()));

                    renderer.render(scene, camera);
                } catch (Exception e) {
                    GWT.log(e.getMessage());
                }
            }
        };
        //timer.schedule(2000);
        timer.scheduleRepeating(1000 / 60);
    }

    @Override
    public void stop() {
        timer.cancel();
    }

    @Override
    public String getName() {
        return "Particle";
    }

    @Override
    public String getHowToHtml() {
        return Bundles.INSTANCE.howto_default().getText();
    }

}