‹ pakt09pakt11 ›

pakt10

See /software/p5js/pakt-februari/pakt10/ for a JavaScript version and /software/supercollider/februari-pakt/pakt10/ 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 pakt10App : public App {
public:
    void setup();
    void draw();
    int index, n;
    float rows, cols;
    float rowMod, colMod;
    float magic;
};

void pakt10App::setup() {
    index= 0;
    n= 1200;
    rows= 11;
    cols= 12;
    rowMod= 2.0f;
    colMod= 3.0f;
    magic= 0.0f;
}

void pakt10App::draw() {
    cairo::Context ctx(cairo::createWindowSurface());
    
    float w= getWindowWidth();
    float h= getWindowHeight();
    float r= rows+(sin(index*0.013)*rowMod)+(sin(index*0.00133)*rowMod*0.56);
    float c= cols+(cos(index*0.022)*colMod)+(cos(index*0.00122)*colMod*0.45);
    
    cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
    radialGrad.addColorStop(0, Color(0.2, 0.2, 0.5));
    radialGrad.addColorStop(1, Color(0, 0, 0));
    ctx.setSource(radialGrad);
    ctx.paint();
    
    ctx.setSourceRgba(1, 1, 0.2, 0.85);
    for(int i= 0; i<n; i++) {
        vec2 p= vec2(fmod((r+i), w), fmod((c+i)*(fmod(i, magic+1.01f)), h));
        ctx.moveTo(p);
        ctx.lineTo(p+vec2(10*sin((index+i)*0.02), 10*cos((index+i)*0.03)));
    }
    ctx.stroke();
    rows= rows+(sin(index*0.0004));
    cols= cols+(sin(index*0.0005));
    index++;
    magic= fmod(magic+0.00002f, 15.0f);
}

CINDER_APP(pakt10App, Renderer2d, [&]( App::Settings *settings ) {
    settings->setWindowSize( WIDTH, HEIGHT );
    settings->setResizable( false );
})