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pakt18

See /software/p5js/pakt-februari/pakt18/ for a JavaScript version and /software/supercollider/februari-pakt/pakt18/ 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 pakt18App : public App {
public:
    void setup();
    void draw();
    int index;
    float w, h;
    float a, b, c, d;
    float spread;
    int n;
};

void pakt18App::setup() {
    index= 0;
    w= getWindowWidth();
    h= getWindowHeight();
    n= 50;
}

void pakt18App::draw() {
    
    spread= sin(index*0.002f)*50.0f+(sin(index*0.003f)*40.0f);
    
    cairo::Context ctx(cairo::createWindowSurface());
    ctx.setSourceRgb(0.0, 0.0, 0.0);
    ctx.paint();
    ctx.setLineWidth(1.0);
    for(int i= 0; i<n; i++) {
        if(i==0) {
            ctx.moveTo(0, 0);
        } else {
            ctx.setSourceRgba(1, 1, 1, sin(float(i)/n*M_PI));
            a= sin(((i*spread)+index)*sin(index*0.0025+(sin(index*0.0050f)))*0.005f)*0.45f+0.5f;
            b= sin(((i*spread)+index)*sin(index*0.0024+(sin(index*0.0051f)))*0.005f)*0.45f+0.5f;
            c= sin(((i*spread)+index)*sin(index*0.0023+(sin(index*0.0052f)))*0.005f)*0.45f+0.5f;
            d= sin(((i*spread)+index)*sin(index*0.0022+(sin(index*0.0053f)))*0.005f)*0.45f+0.5f;
            ctx.line(vec2(a*w, b*h), vec2(c*w, d*h));
            ctx.line(vec2(b*w, a*h), vec2(d*w, c*h));
            ctx.stroke();
        }
    }
    index++;
}

CINDER_APP(pakt18App, Renderer2d, [&]( App::Settings *settings ) {
    settings->setWindowSize( WIDTH, HEIGHT );
    settings->setResizable( false );
})