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pakt10

See /software/p5js/pakt-februari/pakt10/ for a JavaScript version and /software/supercollider/februari-pakt/pakt10/ 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 pakt10App : public App {
public:
  void setup();
  void draw();
  int index, n;
  float rows, cols;
  float rowMod, colMod;
  float magic;
};

void pakt10App::setup() {
  index= 0;
  n= 1200;
  rows= 11;
  cols= 12;
  rowMod= 2.0f;
  colMod= 3.0f;
  magic= 0.0f;
}

void pakt10App::draw() {
  cairo::Context ctx(cairo::createWindowSurface());

  float w= getWindowWidth();
  float h= getWindowHeight();
  float r= rows+(sin(index*0.013)*rowMod)+(sin(index*0.00133)*rowMod*0.56);
  float c= cols+(cos(index*0.022)*colMod)+(cos(index*0.00122)*colMod*0.45);

  cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
  radialGrad.addColorStop(0, Color(0.2, 0.2, 0.5));
  radialGrad.addColorStop(1, Color(0, 0, 0));
  ctx.setSource(radialGrad);
  ctx.paint();

  ctx.setSourceRgba(1, 1, 0.2, 0.85);
  for(int i= 0; i<n; i++) {
    vec2 p= vec2(fmod((r+i), w), fmod((c+i)*(fmod(i, magic+1.01f)), h));
    ctx.moveTo(p);
    ctx.lineTo(p+vec2(10*sin((index+i)*0.02), 10*cos((index+i)*0.03)));
  }
  ctx.stroke();
  rows= rows+(sin(index*0.0004));
  cols= cols+(sin(index*0.0005));
  index++;
  magic= fmod(magic+0.00002f, 15.0f);
}

CINDER_APP(pakt10App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})