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@Bleuje Bleuje/spiraltut.pde
Last active Feb 23, 2019

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// by Etienne JACOB
// motion blur template by beesandbombs
// needs opensimplexnoise code in another tab
// --> code here : https://gist.github.com/Bleuje/fce86ef35b66c4a2b6a469b27163591e
int[][] result;
float t, c;
float ease(float p) {
return 3*p*p - 2*p*p*p;
}
float ease(float p, float g) {
if (p < 0.5)
return 0.5 * pow(2*p, g);
else
return 1 - 0.5 * pow(2*(1 - p), g);
}
float mn = .5*sqrt(3), ia = atan(sqrt(.5));
void push() {
pushMatrix();
pushStyle();
}
void pop() {
popStyle();
popMatrix();
}
void draw() {
if (!recording) {
t = mouseX*1.0/width;
c = mouseY*1.0/height;
if (mousePressed)
println(c);
draw_();
} else {
for (int i=0; i<width*height; i++)
for (int a=0; a<3; a++)
result[i][a] = 0;
c = 0;
for (int sa=0; sa<samplesPerFrame; sa++) {
t = map(frameCount-1 + sa*shutterAngle/samplesPerFrame, 0, numFrames, 0, 1);
draw_();
loadPixels();
for (int i=0; i<pixels.length; i++) {
result[i][0] += pixels[i] >> 16 & 0xff;
result[i][1] += pixels[i] >> 8 & 0xff;
result[i][2] += pixels[i] & 0xff;
}
}
loadPixels();
for (int i=0; i<pixels.length; i++)
pixels[i] = 0xff << 24 |
int(result[i][0]*1.0/samplesPerFrame) << 16 |
int(result[i][1]*1.0/samplesPerFrame) << 8 |
int(result[i][2]*1.0/samplesPerFrame);
updatePixels();
saveFrame("fr###.gif");
println(frameCount,"/",numFrames);
if (frameCount==numFrames)
exit();
}
}
//////////////////////////////////////////////////////////////////////////////
int samplesPerFrame = 5;
int numFrames = 75;
float shutterAngle = .6;
boolean recording = true;
OpenSimplexNoise noise;
void setup(){
size(600,600,P2D);
result = new int[width*height][3];
noise = new OpenSimplexNoise();
}
float turns = 12;
int n = 7000;
int K = 8;
float rad = 1.5;
void draw_(){
background(0);
push();
translate(width/2,height/2);
stroke(255,100);
strokeWeight(1.5);
noFill();
for(int k=0;k<K;k++){
for(int i=1;i<n;i++){
float p = (1.0*(i+0*t)/n)%1;
float pp = pow(p,0.5);
float c1 = 0.1+ease(constrain(map(p,0.85,1,1,0),0,1),2.0);
float c2 = ease(constrain(map(p,0,.02,0,1),0,1),2.0);
float theta = turns*TWO_PI*pow(0.1+0.9*pp,0.5);
float r = 0.4*width*pow(p,0.5);
float x = r*cos(theta);
float y = r*sin(theta)+(0.25*width-0.25*width*pow(0.05+0.95*p,0.4+0.03*cos(TWO_PI*t)));
float l = 25*c1*c2*constrain(map(y,-height/2,height/2-100,2.0,0),0.12,1);
float part = 20.0;
float dx = l*(float)noise.eval(12+0.79*k+rad*cos(TWO_PI*(part*p-t)),rad*sin(TWO_PI*(part*p-t)),30*p);
float dy = l*(float)noise.eval(92+0.79*k+rad*cos(TWO_PI*(part*p-t)),rad*sin(TWO_PI*(part*p-t)),30*p);
stroke(255*c1,30*c1);
point(x+dx,y+dy);
}
}
pop();
}
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