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- //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();
- }
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