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pakt03

See /software/p5js/pakt-februari/pakt03/ for a JavaScript version and /software/supercollider/februari-pakt/pakt03/ 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 pakt03App : public App {
public:
    void setup();
    void draw();
    int index, n;
};

void pakt03App::setup() {
    index= 0;
    n= 50;
}

void pakt03App::draw() {
    
    float x= getWindowCenter().x;
    float y= getWindowCenter().y;
    float w= getWindowWidth()*0.4;
    float h= getWindowHeight()*0.4;
    float spreadx= sin(index*0.005);
    float spready= sin(index*0.011);
    float phaseshift= sin(index*0.001)*M_PI*2;
    float wx= w*(sin(index*0.004)*0.45+0.55);
    float hy= h*(sin(index*0.004)*0.45+0.55);
    
    cairo::Context ctx(cairo::createWindowSurface());
    
    cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
    radialGrad.addColorStop(0, Color(0.7, 0.6, 0.5));
    radialGrad.addColorStop(1, Color(0, 0, 0));
    ctx.setSource(radialGrad);
    ctx.paint();
    
    for(int i= 0; i<n; i++) {
        float r= i/(float)n*30.0+1.0;
        float p= 0;
        ctx.setSourceRgba(1, 1, 1, 0.5);
        ctx.circle(vec2(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy), r);
        ctx.fill();
        p= p+phaseshift;
        ctx.setSourceRgba(0, 0, 1, 0.5);
        ctx.circle(vec2(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy), r);
        ctx.fill();
        /*p= p+phaseshift;
         ctx.setSourceRgba(0, 1, 0, 0.5);
         ctx.circle(vec2(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy), r);
         ctx.fill();
         p= p+phaseshift;
         ctx.setSourceRgba(1, 0, 0, 0.5);
         ctx.circle(vec2(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy), r);
         ctx.fill();
         p= p+phaseshift;
         ctx.setSourceRgba(0, 0, 0, 0.5);
         ctx.circle(vec2(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy), r);
         ctx.fill();*/
    }
    index++;
}

CINDER_APP(pakt03App, Renderer2d, [&]( App::Settings *settings ) {
    settings->setWindowSize( WIDTH, HEIGHT );
    settings->setResizable( false );
})