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//--------------------------------------------------------------------------//
// Force field animator by Etienne Jacob (www.necessary-disorder.tumblr.com)//
// Processing code (https://processing.org)                                 //
// Saves frames, then you must use something else to make the GIF           //
//--------------------------------------------------------------------------//
/// This code starts with the rendering system I took from @beesandbombs
/// (it also contains some useful functions and stuff)
/// You don't have to understand it
/// Just know that it does an average on many drawings to get a motion blur effect
/// from drawings parametrized by the global variable t going from 0 to 1

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//--------------------------------------------------------------------------//
// Force field animator by Etienne Jacob (www.necessary-disorder.tumblr.com)//
// Processing code (https://processing.org)                                 //
// Saves frames, then you must use something else to make the GIF           //
//--------------------------------------------------------------------------//
/// This code starts with the rendering system I took from @beesandbombs
/// (it also contains some useful functions and stuff)
/// You don't have to understand it
/// Just know that it does an average on many drawings to get a motion blur effect
/// from drawings parametrized by the global variable t going from 0 to 1

Bleuje

void setup() {
  size(500, 500);
  background(0);
  smooth(8);
  noFill();
  stroke(235, 15);
  strokeWeight(0.9);
 
  x1=y1=-3;
  x2=y2=3;

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void setup() {
  size(600, 600);
  background(0);
  smooth(8);
  noFill();
  stroke(235, 15);
  strokeWeight(0.9);
 
  x1=y1=-3;
  x2=y2=3;

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// Field example
PVector field(float x,float y){
  float ns = 20*noise(0.01*x,0.01*y);
  return new PVector(1.0*cos(ns),1.0*sin(ns));
}

/*
// Flow field
float dt = 0.1;

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void setup(){
  size(500,500);
  background(0);
}


float a1 = 1.0,a2 = 1.2,a3 = 1.0,a4 = 1.5;
float d1 = 0.00002,d2 = 0.00002,d3 = 0.0005,d4 = 0.00002;
float f1 = 1,f2 = 2, f3 = 3.2,f4 = 4.1;
float p1 = 0,p2 = 0,p3 = 0,p4 = 0;

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// note : if you're on github gist and want to copy paste this code, you can click on the "Raw" button
// and then do Ctrl A, Ctrl C, Ctrl V
// (code below by Kurt Spencer, slightly modified code to run as Processing tab)
// maybe you should rather use this new (improved) version of the noise instead : https://github.com/KdotJPG/OpenSimplex2

/*
 * OpenSimplex Noise in Java.
 * by Kurt Spencer
 * 
 * v1.1 (October 5, 2014)

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OpenSimplexNoise noise;

int[][] result;
float t, c;

float ease(float p) {
  return 3*p*p - 2*p*p*p;
}

float ease(float p, float g) {

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int numFrames = 100;

PVector field(float x,float y){
  float amount = 2.5;
  float scale = 0.03;
  float radius = 0.45;
  double value1 = 400.0*noise.eval(scale*x,scale*y,radius*cos(TWO_PI*1.0*(frameCount-1)/numFrames),radius*sin(TWO_PI*1.0*(frameCount-1)/numFrames));
  double value2 = 400.0*noise.eval(1000+scale*x,scale*y,radius*cos(TWO_PI*1.0*(frameCount-1)/numFrames),radius*sin(TWO_PI*1.0*(frameCount-1)/numFrames));
  //int value2 = (int) Math.round(value);
  float parameter1 = (int) Math.round(value1)/100.0;

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OpenSimplexNoise noise;

void setup(){
  size(500,500);
  
  noise = new OpenSimplexNoise();
}

int spacing = 15;
int numFrames = 100;