‹ pakt13pakt15 ›

pakt14

See /software/p5js/pakt-februari/pakt14/ for a JavaScript version and /software/supercollider/februari-pakt/pakt14/ 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 pakt14App : public App {
public:
  void setup();
  void draw();
  int index;
  float w, h;
  float spread;
  float spreadx, spready;
  int n;
};

void pakt14App::setup() {
  index= 0;
  w= getWindowWidth();
  h= getWindowHeight();
  n= 100;
}

void pakt14App::draw() {
  cairo::Context ctx(cairo::createWindowSurface());
  ctx.setFillRule(1);

  cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
  radialGrad.addColorStop(0, Color(0.5f, 0.5f, 0.6f));
  radialGrad.addColorStop(1, Color(0.0f, 0.0f, 0.0f));
  ctx.setSource(radialGrad);
  ctx.paint();

  ctx.setSourceRgba(1.0f, 1.0f, 1.0f, 0.85f);

  for(int i= 0; i<=n; i++) {
    spreadx= sin((i+index)*0.011f)*sin((i+index)*0.013f);
    spready= sin((i+index)*0.012f)*sin((i+index)*0.014f);
    spread= (spreadx*spready)*0.25f+cos((index+i)*0.001f);

    float yy= sin((i+index)*0.012f+spready);
    float hh= yy*(cos(index*0.013f));
    float xx= cos((i+index)*0.014f+spreadx);
    float ww= xx*(sin(index*0.015f));
    yy= yy*(h*spread)+(h*0.5f);
    xx= xx*(h*spread)+(h*0.5f);
    hh= hh*(h*spread)+(h*0.5f);
    ww= ww*(h*spread)+(h*0.5f);
    if(i==0) {
      ctx.moveTo(xx, yy);
    } else if(i%5==1) {
      ctx.quadTo(xx, yy, ww, hh);
    } else if(i%5==2) {
      ctx.quadTo(yy, xx, hh, ww);
    } else if(i%5==3) {
      ctx.quadTo(xx, yy, hh, ww);
    } else if(i%5==4) {
      ctx.quadTo(yy, xx, ww, hh);
    } else {
      ctx.moveTo(yy, xx);
    }
  }
  ctx.fill();
  index++;
}

CINDER_APP(pakt14App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})