Skip to content

Instantly share code, notes, and snippets.

@Bleuje
Created July 20, 2017 10:46
Show Gist options
  • Save Bleuje/f05706ded03ece18c2d9f44394282457 to your computer and use it in GitHub Desktop.
Save Bleuje/f05706ded03ece18c2d9f44394282457 to your computer and use it in GitHub Desktop.
//using code by dave (@beesandbombs)
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("frame-###.png");
if (frameCount==numFrames)
exit();
}
}
//////////////////////////////////////////////////////////////////////////////
int samplesPerFrame = 8;
int numFrames = 200;
float shutterAngle = .9;
boolean recording = false;
int n = 500;
float r = 50;
float x(float q){
return r*(sin(q) + 2*sin(2*q));
}
float y(float q){
return r*(cos(q) - 2*cos(2*q));
}
float h = 1e-4;
float xp(float q){
return r*(cos(q)+4*cos(2*q));
}
float yp(float q){
return -r*(sin(q)-4*sin(2*q));
}
float xpp(float q){
return (xp(q+h/2)-xp(q-h/2))/h;
}
float ypp(float q){
return (yp(q+h/2)-yp(q-h/2))/h;
}
float xpn(float q){
return xp(q)/dist(xp(q),yp(q),0,0);
}
float ypn(float q){
return yp(q)/dist(xp(q),yp(q),0,0);
}
float th;
void drawCurve(){
stroke(255);
noFill();
beginShape();
for(int i=0; i<n; i++){
th = TWO_PI*i/n;
vertex(x(th),y(th));
}
endShape(CLOSE);
}
float radius,xd,yd,xx,yy;
void drawDisk(){
th = TWO_PI*t;
radius = pow(xp(th)*xp(th)+yp(th)*yp(th),1.5)/(xp(th)*ypp(th) - xpp(th)*yp(th));
xd = x(th) - ypn(th)*radius;
yd = y(th) + xpn(th)*radius;
xx = x(th);
yy = y(th);
noStroke();
fill(255);
ellipse(xd,yd,2*radius-7,2*radius-7);
ellipse(xx,yy,5,5);
}
void setup() {
size(640,640);
result = new int[width*height][3];
rectMode(CENTER);
stroke(255);
noFill();
strokeWeight(7);
}
void draw_() {
background(0);
push();
translate(width/2,height/2);
blendMode(BLEND);
drawCurve();
push();
blendMode(EXCLUSION);
drawDisk();
pop();
pop();
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment