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pakt26

See /software/p5js/pakt-februari/pakt26/ for a JavaScript version and /software/supercollider/februari-pakt/pakt26/ 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 pakt26App : public App {
public:
  void setup();
  void draw();
  cairo::SurfaceImage srfOff;
  cairo::Context ctxOff;
  int index;
  float w, h;
  float rx, ry;
  int nx, ny;
  float cols, rows;
};

void pakt26App::setup() {
  srfOff= cairo::SurfaceImage(WIDTH, HEIGHT, false);
  ctxOff= cairo::Context(srfOff);
  nx= 45;
  ny= 9;
  index= 0;
  w= getWindowWidth();
  h= getWindowHeight();
  rows= ny;
  ry= h/rows;
}

void pakt26App::draw() {

  cols= (sin(index*0.001f+(sin(index*0.0001f)*10.0f))*0.445f+0.5f)*(nx-1);
  rx= w/cols;

  cairo::Context ctx(cairo::createWindowSurface());
  ctxOff.setSourceRgba(0, 0, 0, 0.06);
  ctxOff.paint();

  for(int x= 0; x<cols; x++) {
    for(int y= 0; y<rows; y++) {
      float c= sin((index+(x*rows)+y)*cos(index*0.0012f)*(sin(index*0.00006f)*0.5f))*0.5f+0.5f;
      float g= c*(sin(index*0.002f+(float(x)/nx*2*M_PI))*cos(index*0.0018f+(float(y)/ny*2*M_PI)))*12.0f+9.0f;
      ctxOff.setSource(ColorA(1.0f, c, c, c));
      ctxOff.rectangle(x*rx+g, y*ry+g, rx-(g*2), ry-(g*2));
      ctxOff.fill();
    }
  }
  index++;
  ctx.copySurface(srfOff, srfOff.getBounds());
}

CINDER_APP(pakt26App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})