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pakt09

See /software/p5js/pakt-februari/pakt09/ for a JavaScript version and /software/supercollider/februari-pakt/pakt09/ 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 pakt09App : public App {
public:
    void setup();
    void draw();
    int index, n, m;
    float rows, cols;
    float magic;
};

void pakt09App::setup() {
    index= 0;
    n= 1000;
    m= 0;
    rows= 3;
    cols= 4;
    magic= 50;
}

void pakt09App::draw() {
    cairo::Context ctx(cairo::createWindowSurface());
    
    float w= getWindowWidth();
    float h= getWindowHeight();
    
    cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
    radialGrad.addColorStop(0, Color(0.5, 0.5, 0.5));
    radialGrad.addColorStop(1, Color(0, 0, 0));
    ctx.setSource(radialGrad);
    ctx.paint();
    
    ctx.setSourceRgba(1, 1, 1, 0.85);
    if(m<n) {
        m= m+1;
    }
    for(int i= 0; i<m; i++) {
        vec2 p= vec2(fmod((rows+i), w), fmod((cols+i)*(fmod(i, magic)), h));
        ctx.rectangle(p, p+vec2(8*sin((index+i)*0.012), 8*cos((index+i)*0.011)));
    }
    ctx.fill();
    magic= magic+(sin(index*0.001)*0.01);
    rows= rows+(sin(index*0.0004));
    cols= cols+(sin(index*0.0005));
    index++;
}

CINDER_APP(pakt09App, Renderer2d, [&]( App::Settings *settings ) {
    settings->setWindowSize( WIDTH, HEIGHT );
    settings->setResizable( false );
})