pakt04
See /software/p5js/pakt-februari/pakt04/ for a JavaScript version and /software/supercollider/februari-pakt/pakt04/ 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 pakt04App : public App {
public:
void setup();
void draw();
int index, n;
};
void pakt04App::setup() {
index= 0;
n= 90;
}
void pakt04App::draw() {
float x= getWindowCenter().x;
float y= getWindowCenter().y;
float w= getWindowWidth()*0.49;
float h= getWindowHeight()*0.49;
float spreadx= sin(index*0.005)*5.0;
float spready= cos(index*0.006)*5.0;
float wx= w*(sin(index*0.0125)*0.4+0.6);
float hy= h*(cos(index*0.01)*0.4+0.6);
cairo::Context ctx(cairo::createWindowSurface());
cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
radialGrad.addColorStop(0, Color(0.5, 0.7, 0.5));
radialGrad.addColorStop(1, Color(0, 0, 0));
ctx.setSource(radialGrad);
ctx.paint();
ctx.setSourceRgba(1, 1, 1, 0.8);
ctx.setLineWidth(3.0);
for(int i= 0; i<int(n+(sin(index*0.00876)*50)); i++) {
vec2 p= vec2(x+(sin((index+(i*spreadx))*0.05)*sin((index+i)*0.01)*wx), y+sin((index+(i*spready))*0.04)*sin((index+i)*0.02)*hy);
if(i==0) {
ctx.moveTo(p.x, p.y);
} else {
ctx.lineTo(p);
}
}
ctx.stroke();
//ctx.fill();
index++;
}
CINDER_APP(pakt04App, Renderer2d, [&]( App::Settings *settings ) {
settings->setWindowSize( WIDTH, HEIGHT );
settings->setResizable( false );
})