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fourth-exercise.html
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<!DOCTYPE html>
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>
<head>
<title>Fourth Exercise - Computer Science Notes</title>
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<meta name="author" content="Sergio Ugalde Marcano" />
<meta name="keywords" content="Fifth-Semester" />
<meta name="description" content="This program spawns particles around the mouse" />
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<meta property="og:description" content="This program spawns particles around the mouse"/>
<meta property="article:published_time" content="2015-09-09" />
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Fourth Exercise
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<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2015-09-09T00:00:00-05:00"> Wed 09 September 2015</time>
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<h2 id="experience">Experience</h2>
<p>The program required some simple but interesting modifications from the provided example, I had to reconsider my choice once I realized my original plan of creating multiple particle systems was less efficient as changing the coordinates of the origin of individual particles. </p>
<h2 id="video">Video</h2>
<p>https://drive.google.com/open?id=0B7aIgTzs5Ai_MmZsODZlUDV5eHM</p>
<h2 id="code">Code</h2>
<p>:::java
// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com</p>
<div class="highlight"><pre>ParticleSystem ps;
void setup() {
size(640,360);
ps = new ParticleSystem(new PVector(mouseX, mouseY));
}
void draw() {
background(255);
ps.addParticle();
ps.run();
}
// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com
// Simple Particle System
class Particle {
PVector location;
PVector velocity;
PVector acceleration;
float lifespan;
Particle(PVector l) {
acceleration = new PVector(0,0.05);
velocity = new PVector(random(-1,1),random(-2,0));
location = l.get();
lifespan = 255.0;
}
void run() {
update();
display();
}
// Method to update location
void update() {
velocity.add(acceleration);
location.add(velocity);
lifespan -= 2.0;
}
// Method to display
void display() {
stroke(0,lifespan);
strokeWeight(2);
fill(127,lifespan);
ellipse(location.x,location.y,12,12);
}
// Is the particle still useful?
boolean isDead() {
if (lifespan < 0.0) {
return true;
} else {
return false;
}
}
}
// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com
// Using Generics now! comment and annotate, etc.
class ParticleSystem {
ArrayList<Particle> particles;
PVector origin;
ParticleSystem(PVector location) {
origin = location.get();
particles = new ArrayList<Particle>();
}
void addParticle() {
particles.add(new Particle(new PVector(mouseX,mouseY)));
}
void run() {
for (int i = particles.size()-1; i >= 0; i--) {
Particle p = particles.get(i);
p.run();
if (p.isDead()) {
particles.remove(i);
}
}
}
}
</pre></div>
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