130 lines
4.6 KiB
Java
Executable File
130 lines
4.6 KiB
Java
Executable File
/*
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* Teilchen
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*
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* Copyright (C) 2013
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* {@link http://www.gnu.org/licenses/lgpl.html}
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*
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*/
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package teilchen.demo;
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import processing.core.PApplet;
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import teilchen.Particle;
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import teilchen.Physics;
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import teilchen.ShortLivedParticle;
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import teilchen.force.Gravity;
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import teilchen.force.PlaneDeflector;
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import teilchen.force.ViscousDrag;
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/**
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* this sketch shows 1 how to create and use plane deflectors 2 how to use
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* 'ShortLivedParticle'
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*/
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public class Lesson04_Deflectors
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extends PApplet {
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private Physics mPhysics;
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private PlaneDeflector mDeflector;
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public void setup() {
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size(640, 480, OPENGL);
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smooth();
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frameRate(30);
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/* create a particle system */
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mPhysics = new Physics();
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/* create a deflector and add it to the particle system.
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* the that defines the deflection area is defined by an
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* origin and a normal. this also means that the plane s size
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* is infinite.
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* note that there is also a triangle delfector that is constraint
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* by three points.
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*/
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mDeflector = new PlaneDeflector();
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/* set plane origin into the center of the screen */
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mDeflector.plane().origin.set(width / 2, height / 2, 0);
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mDeflector.plane().normal.set(0, -1, 0);
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/* the coefficient of restitution defines how hard particles bounce of the deflector */
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mDeflector.coefficientofrestitution(0.7f);
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mPhysics.add(mDeflector);
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/* create gravitiy */
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Gravity myGravity = new Gravity();
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myGravity.force().y = 50;
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mPhysics.add(myGravity);
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/* create drag */
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ViscousDrag myViscousDrag = new ViscousDrag();
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myViscousDrag.coefficient = 0.1f;
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mPhysics.add(myViscousDrag);
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}
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public void draw() {
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/* rotate deflector plane */
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if (mousePressed) {
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final float myAngle = 2 * PI * (float) mouseX / width - PI;
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mDeflector.plane().normal.set(sin(myAngle), -cos(myAngle), 0);
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}
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/* create a special particle */
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ShortLivedParticle myNewParticle = new ShortLivedParticle();
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myNewParticle.position().set(mouseX, mouseY);
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myNewParticle.velocity().set(0, random(100) + 50);
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/* this particle is removed after a specific interval */
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myNewParticle.setMaxAge(4);
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/* add particle manually to the particle system */
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mPhysics.add(myNewParticle);
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/* update physics */
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final float mDeltaTime = 1.0f / frameRate;
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mPhysics.step(mDeltaTime);
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/* draw all the particles in the particle system */
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background(255);
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for (int i = 0; i < mPhysics.particles().size(); i++) {
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Particle myParticle = mPhysics.particles(i);
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/* this special particle can tell you how much time it has to live.
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* we map this information to its transparency.
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*/
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float myRatio = 1 - ((ShortLivedParticle) myParticle).ageRatio();
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stroke(0, 64 * myRatio);
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fill(0, 32 * myRatio);
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ellipse(myParticle.position().x, myParticle.position().y, 12, 12);
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}
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/* draw deflector */
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stroke(0, 127);
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line(mDeflector.plane().origin.x - mDeflector.plane().normal.y * -width,
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mDeflector.plane().origin.y + mDeflector.plane().normal.x * -width,
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mDeflector.plane().origin.x - mDeflector.plane().normal.y * width,
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mDeflector.plane().origin.y + mDeflector.plane().normal.x * width);
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stroke(255, 0, 0, 127);
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line(mDeflector.plane().origin.x,
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mDeflector.plane().origin.y,
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mDeflector.plane().origin.x + mDeflector.plane().normal.x * 20,
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mDeflector.plane().origin.y + mDeflector.plane().normal.y * 20);
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}
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public static void main(String[] args) {
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PApplet.main(new String[]{Lesson04_Deflectors.class.getName()});
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}
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}
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