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pakt11

See /software/p5js/pakt-februari/pakt11/ for a JavaScript version and /software/supercollider/februari-pakt/pakt11/ 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 pakt11App : public App {
public:
    void setup();
    void draw();
    int index, n;
    float rowsMid, colsMid, rows, cols, w, h;
};
void pakt11App::setup() {
    index= 0;
    rowsMid= 22.0f;
    colsMid= 20.0f;
    w= getWindowWidth();
    h= getWindowHeight();
}
void pakt11App::draw() {
    cairo::Context ctx(cairo::createWindowSurface());
    ctx.scale(0.96f, 0.96f);
    ctx.translate(5.0f, 5.0f);
    rows= rowsMid+(sin(index*0.0015)*10.0f);
    cols= colsMid+(sin(index*0.0024)*10.0f);
    cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
    radialGrad.addColorStop(0, Color(0.6, 0.5, 0.5));
    radialGrad.addColorStop(1, Color(0, 0, 0));
    ctx.setSource(radialGrad);
    ctx.paint();
    ctx.setSourceRgb(1, 1, 1);
    ctx.moveTo(0, 0);
    for(int y= 0; y<=rows; y++) {
        for(int x= 0; x<=cols; x++) {
            ctx.lineTo((x/rows*w)+sin(index+(x*y)*32.0f), (y/cols*h)+cos(index+(x*y)*24.0f));
            ctx.lineTo((x/cols*w)+sin(index+(x*y)*32.0f), (y/rows*h)+cos(index+(x*y)*24.0f));
        }
    }
    ctx.fill();
    index++;
}
CINDER_APP(pakt11App, Renderer2d, [&]( App::Settings *settings ) {
    settings->setWindowSize( WIDTH, HEIGHT );
    settings->setResizable( false );
})