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pakt22

See /software/p5js/pakt-februari/pakt22/ for a JavaScript version and /software/supercollider/februari-pakt/pakt22/ 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 pakt22App : public App {
public:
  void setup();
  void draw();
  cairo::SurfaceImage srfOff;
  cairo::Context ctxOff;
  int index;
  float w, h;
  float theta;
  int rows, cols;
};

void pakt22App::setup() {
  srfOff= cairo::SurfaceImage(WIDTH, HEIGHT, false);
  ctxOff= cairo::Context(srfOff);
  ctxOff.setSourceRgb(0, 0, 0);
  ctxOff.paint();
  index= 0;
  w= getWindowWidth();
  h= getWindowHeight();
  cols= 10;
  rows= 14;
}

void pakt22App::draw() {

  cairo::Context ctx(cairo::createWindowSurface());
  ctxOff.setSourceRgba(0.1, 0, 0, 0.1);
  ctxOff.paint();
  ctxOff.setFillRule(1);
  ctxOff.setSourceRgb(1.0, 0.0, 0.0);
  theta= (sin(index*0.0004f)*0.1f)+(sin(index*0.004f)*(sin(index*0.00004f)*6.0f));
  float rc= (sin(index*0.051f)*0.01f+1.0f)/cols;
  float rr= (cos(index*0.062f)*0.01f+1.0f)/rows;

  for(int x= 0; x<cols; x++) {
    float rw= sin(float(x)/cols*M_PI*sin(index*0.0032f)+theta)*cols*5.0f;
    for(int y= 0; y<rows; y++) {
      float rh= cos(float(y)/rows*M_PI*cos(index*0.0034f)+theta)*rows*5.0f;
      if(y%2==0) {
        ctxOff.circle(rc*x*w+(rw*0.5f), rr*y*h+(rw*0.5f), rw);
      } else {
        ctxOff.circle(rc*x*w+(rh*0.5f), rr*y*h+(rh*0.5f), rh);
      }
    }
  }
  ctxOff.fill();
  index++;
  ctx.copySurface(srfOff, srfOff.getBounds());
}

CINDER_APP(pakt22App, Renderer2d, [&]( App::Settings *settings ) {
  settings->setWindowSize( WIDTH, HEIGHT );
  settings->setResizable( false );
})