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pakt27

See /software/p5js/pakt-februari/pakt27/ for a JavaScript version and /software/supercollider/februari-pakt/pakt27/ for accompanying sound code.

#include "cinder/app/App.h"
#include "cinder/cairo/Cairo.h"

using namespace ci;
using namespace ci::app;
using namespace std;

const int WIDTH= 640;
const int HEIGHT= 480;

class pakt27App : public App {
public:
  void setup();
  void draw();
  cairo::SurfaceImage srfOff;
  cairo::Context ctxOff;
  int index;
  float w, h;
  int n;
};

void pakt27App::setup() {
  srfOff= cairo::SurfaceImage(WIDTH, HEIGHT, false);
  ctxOff= cairo::Context(srfOff);
  n= 80;
  index= 0;
  w= getWindowWidth()*0.5f;
  h= getWindowHeight()*0.5f;
}

void pakt27App::draw() {

  cairo::Context ctx(cairo::createWindowSurface());
  ctxOff.setSourceRgba(0, 0, 0, 0.2f);
  ctxOff.paint();

  for(int i= 0; i<n; i++) {
    float t= float(i)/n*M_PI*2;
    ctxOff.setSource(ColorA(CM_HSV, sin(t)*0.15f+0.15f, 1.0f, 1.0f, 0.4f));
    float c= (sin(index*0.036f+t)+cos(index*0.022f-t))*0.01f;
    float d= (cos(index*0.033f+t)+sin(index*0.020f-t))*0.01f;
    float r= sin(t)*25.0f+30.0f;
    ctxOff.circle(w+(sin((index*(d*0.05f))+c+t)*(w*0.8f)), h+(cos((index*(c*0.05f))+d+t)*(h*0.7f)), r);
    ctxOff.fill();
  }
  index++;
  ctx.copySurface(srfOff, srfOff.getBounds());
}

CINDER_APP(pakt27App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})