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pakt22

See /software/p5js/pakt-februari/pakt22/ for a JavaScript version and /software/supercollider/februari-pakt/pakt22/ 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 pakt22App : public App {
public:
    void setup();
    void draw();
    cairo::SurfaceImage srfOff;
    cairo::Context ctxOff;
    int index;
    float w, h;
    float theta;
    int rows, cols;
};
void pakt22App::setup() {
    srfOff= cairo::SurfaceImage(WIDTH, HEIGHT, false);
    ctxOff= cairo::Context(srfOff);
    ctxOff.setSourceRgb(0, 0, 0);
    ctxOff.paint();
    index= 0;
    w= getWindowWidth();
    h= getWindowHeight();
    cols= 10;
    rows= 14;
}
void pakt22App::draw() {
    cairo::Context ctx(cairo::createWindowSurface());
    ctxOff.setSourceRgba(0.1, 0, 0, 0.1);
    ctxOff.paint();
    ctxOff.setFillRule(1);
    ctxOff.setSourceRgb(1.0, 0.0, 0.0);
    theta= (sin(index*0.0004f)*0.1f)+(sin(index*0.004f)*(sin(index*0.00004f)*6.0f));
    float rc= (sin(index*0.051f)*0.01f+1.0f)/cols;
    float rr= (cos(index*0.062f)*0.01f+1.0f)/rows;
    for(int x= 0; x<cols; x++) {
        for(int y= 0; y<rows; y++) {
            float rw= sin(float(x)/cols*M_PI*sin(index*0.0032f)+theta)*cols*5.0f;
            float rh= cos(float(y)/rows*M_PI*cos(index*0.0034f)+theta)*rows*5.0f;
            if(y%2==0) {
                ctxOff.circle(rc*x*w+(rw*0.5f), rr*y*h+(rw*0.5f), rw);
            } else {
                ctxOff.circle(rc*x*w+(rh*0.5f), rr*y*h+(rh*0.5f), rh);
            }
        }
    }
    ctxOff.fill();
    index++;
    ctx.copySurface(srfOff, srfOff.getBounds());
}
CINDER_APP(pakt22App, Renderer2d, [&]( App::Settings *settings ) {
    settings->setWindowSize( WIDTH, HEIGHT );
    settings->setResizable( false );
})