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pakt04

See /software/p5js/pakt-februari/pakt04/ for a JavaScript version and /software/supercollider/februari-pakt/pakt04/ 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 pakt04App : public App {
public:
  void setup();
  void draw();
  int index, n;
};

void pakt04App::setup() {
  index= 0;
  n= 90;
}

void pakt04App::draw() {

  float x= getWindowCenter().x;
  float y= getWindowCenter().y;
  float w= getWindowWidth()*0.49;
  float h= getWindowHeight()*0.49;
  float spreadx= sin(index*0.005)*5.0;
  float spready= cos(index*0.006)*5.0;
  float wx= w*(sin(index*0.0125)*0.4+0.6);
  float hy= h*(cos(index*0.01)*0.4+0.6);

  cairo::Context ctx(cairo::createWindowSurface());

  cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
  radialGrad.addColorStop(0, Color(0.5, 0.7, 0.5));
  radialGrad.addColorStop(1, Color(0, 0, 0));
  ctx.setSource(radialGrad);
  ctx.paint();

  ctx.setSourceRgba(1, 1, 1, 0.8);
  ctx.setLineWidth(3.0);
  for(int i= 0; i<int(n+(sin(index*0.00876)*50)); i++) {
    vec2 p= vec2(x+(sin((index+(i*spreadx))*0.05)*sin((index+i)*0.01)*wx), y+sin((index+(i*spready))*0.04)*sin((index+i)*0.02)*hy);
    if(i==0) {
      ctx.moveTo(p.x, p.y);
    } else {
      ctx.lineTo(p);
    }
  }
  ctx.stroke();
  //ctx.fill();
  index++;
}

CINDER_APP(pakt04App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})