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PShape Particle renderer example
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‎examples/liquidfun_DamBreak_PShapeParticles/liquidfun_DamBreak_PShapeParticles.java‎

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/**
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*
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* LiquidFunProcessing | Copyright 2017 Thomas Diewald - www.thomasdiewald.com
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*
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* https://github.com/diwi/LiquidFunProcessing.git
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*
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* Box2d / LiquidFun Library for Processing.
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* MIT License: https://opensource.org/licenses/MIT
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*
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*/
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package liquidfun_DamBreak_PShapeParticles;
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import com.thomasdiewald.liquidfun.java.DwWorld;
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import com.thomasdiewald.liquidfun.java.render.DwParticleRenderP5;
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import org.jbox2d.collision.shapes.ChainShape;
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import org.jbox2d.collision.shapes.PolygonShape;
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import org.jbox2d.common.Color3f;
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import org.jbox2d.common.Vec2;
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import org.jbox2d.dynamics.Body;
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import org.jbox2d.dynamics.BodyDef;
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import org.jbox2d.particle.ParticleGroupDef;
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import org.jbox2d.particle.ParticleType;
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import processing.core.*;
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import processing.opengl.PGraphics2D;
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public class liquidfun_DamBreak_PShapeParticles extends PApplet {
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//
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// Simulation of a clash of two big particle-groups.
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//
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//
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// Controls:
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//
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// LMB ... drag bodies
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// LMB + SHIFT ... shoot bullet
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// MMB ... add particles
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// RMB ... remove particles
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// 'r' ... reset
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// 't' ... update/pause physics
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// 'f' ... toggle debug draw
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//
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int viewport_w = 1280;
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int viewport_h = 720;
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int viewport_x = 230;
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int viewport_y = 0;
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boolean UPDATE_PHYSICS = true;
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boolean USE_DEBUG_DRAW = false;
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DwWorld world;
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// PImage sprite;
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public void settings(){
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size(viewport_w, viewport_h, P2D);
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smooth(8);
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}
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public void setup(){
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surface.setLocation(viewport_x, viewport_y);
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// sprite = loadImage("sprite.png");
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reset();
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frameRate(120);
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}
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public void release(){
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if(world != null) world.release(); world = null;
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}
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public void reset(){
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// release old resources
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release();
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world = new DwWorld(this, 18);
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// this replaces the default particle renderer (OpenGL) by a alternative
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// renderer, where particles are rendered s PShape Quads.
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// It renders a bit slower then the OpenGL version and grouped rendering
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// is not possible.
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world.setParticleRender(new DwParticleRenderP5(this, world, world.transform));
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// create scene: rigid bodies, particles, etc ...
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initScene();
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}
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public void draw(){
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if(UPDATE_PHYSICS){
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world.update();
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}
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PGraphics2D canvas = (PGraphics2D) this.g;
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canvas.background(32);
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canvas.pushMatrix();
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world.applyTransform(canvas);
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world.drawBulletSpawnTrack(canvas);
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if(USE_DEBUG_DRAW){
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world.displayDebugDraw(canvas);
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// DwDebugDraw.display(canvas, world);
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} else {
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world.display(canvas);
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}
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canvas.popMatrix();
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// info
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int num_bodies = world.getBodyCount();
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int num_particles = world.getParticleCount();
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String txt_fps = String.format(getClass().getName()+ " [bodies: %d] [particles: %d] [fps %6.2f]", num_bodies, num_particles, frameRate);
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surface.setTitle(txt_fps);
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}
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//////////////////////////////////////////////////////////////////////////////
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// User Interaction
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//////////////////////////////////////////////////////////////////////////////
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public void keyReleased(){
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if(key == 't') UPDATE_PHYSICS = !UPDATE_PHYSICS;
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if(key == 'r') reset();
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if(key == 'f') USE_DEBUG_DRAW = !USE_DEBUG_DRAW;
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}
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//////////////////////////////////////////////////////////////////////////////
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// Scene Setup
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//////////////////////////////////////////////////////////////////////////////
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// https://github.com/jbox2d/jbox2d/blob/master/jbox2d-testbed/src/main/java/org/jbox2d/testbed/tests/DamBreak.java
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public void initScene() {
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float dimx = world.transform.box2d_dimx;
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float dimy = world.transform.box2d_dimy;
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float dimxh = dimx/2;
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float dimyh = dimy/2;
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{
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BodyDef bd = new BodyDef();
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Body ground = world.createBody(bd);
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ChainShape shape = new ChainShape();
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Vec2[] vertices = {new Vec2(-dimxh, 0), new Vec2(dimxh, 0), new Vec2(dimxh, dimy), new Vec2(-dimxh, dimy)};
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shape.createLoop(vertices, 4);
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ground.createFixture(shape, 0.0f);
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world.bodies.add(ground, false, color(0), true, color(0), 1f);
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}
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{
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PolygonShape shape = new PolygonShape();
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ParticleGroupDef pd = new ParticleGroupDef();
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pd.flags = 0
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| ParticleType.b2_waterParticle
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| ParticleType.b2_viscousParticle
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| ParticleType.b2_colorMixingParticle
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// | ParticleType.b2_powderParticle
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// | ParticleType.b2_springParticle
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// | ParticleType.b2_tensileParticle
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;
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float sx = dimxh * 0.25f;
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float sy = dimyh * 0.95f;
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shape.setAsBox(sx, sy, new Vec2(-dimxh/2, dimyh), 0);
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pd.shape = shape;
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pd.setColor(new Color3f(0.00f, 0.2f, 1));
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world.createParticleGroup(pd);
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shape.setAsBox(sx, sy, new Vec2(+dimxh/2, dimyh), 0);
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pd.shape = shape;
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pd.setColor(new Color3f(1.00f, 0.2f, 0.00f));
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world.createParticleGroup(pd);
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}
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}
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public static void main(String args[]) {
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PApplet.main(new String[] { liquidfun_DamBreak_PShapeParticles.class.getName() });
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}
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}

‎src/com/thomasdiewald/liquidfun/java/DwWorld.java‎

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}
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public void setParticleRender(DwParticleRender particle_render){
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if(particle_render == null){
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return;
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}
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if(particles != null){
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particles.release();
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}
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particles = particle_render;
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}
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public void setBodyRender(DwBodyGroup body_render){
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if(body_render == null){
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return;
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}
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if(bodies != null){
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bodies.release();
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}
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bodies = body_render;
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}
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/**
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* called by processing

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