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pakt05

See /software/p5js/pakt-februari/pakt05/ for a JavaScript version and /software/supercollider/februari-pakt/pakt05/ 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 pakt05App : public App {
public:
  void setup();
  void draw();
  int index, n;
};

void pakt05App::setup() {
  index= 0;
  n= 100;
}

void pakt05App::draw() {

  float x= getWindowCenter().x;
  float y= getWindowCenter().y;
  float w= getWindowWidth()*0.3;
  float h= getWindowHeight()*0.275;
  float spread= sin(index*0.0012)*20.0;
  float speed1= sin(index*0.0013)*0.001+0.005;
  float speed2= sin(index*0.0014)*0.001+0.0005;
  float speed3= sin(index*0.0015)*0.001+0.014;
  float speed4= sin(index*0.0016)*0.001+0.012;

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

  cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
  radialGrad.addColorStop(0, Color(0.5, 0.4, 0.3));
  radialGrad.addColorStop(1, Color(0, 0, 0));
  ctx.setSource(radialGrad);
  ctx.paint();

  ctx.setSourceRgba(1, 1, 1, 0.8);
  ctx.setLineWidth(1.0);
  for(int i= 0; i<n; i++) {
    vec2 p= vec2(x+(sin((index*i*speed1))+sin(index*i*speed2)*w)-i, y+sin((index+(i*spread))*speed3)*sin((index+i)*speed4)*h+i);
    ctx.moveTo(p.x+(n-i), p.y+(i-n));
    ctx.lineTo(p);
  }
  ctx.stroke();
  index++;
}

CINDER_APP(pakt05App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})