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 );
})