pakt05
See /software/p5js/pakt-februari/pakt05/ for a JavaScript version and /software/supercollider/februari-pakt/pakt05/ 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 pakt05App : public App {
public:
void setup();
void draw();
int index, n;
};
void pakt05App::setup() {
index= 0;
n= 100;
}
void pakt05App::draw() {
float x= getWindowCenter().x;
float y= getWindowCenter().y;
float w= getWindowWidth()*0.3;
float h= getWindowHeight()*0.275;
float spread= sin(index*0.0012)*20.0;
float speed1= sin(index*0.0013)*0.001+0.005;
float speed2= sin(index*0.0014)*0.001+0.0005;
float speed3= sin(index*0.0015)*0.001+0.014;
float speed4= sin(index*0.0016)*0.001+0.012;
cairo::Context ctx(cairo::createWindowSurface());
cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
radialGrad.addColorStop(0, Color(0.5, 0.4, 0.3));
radialGrad.addColorStop(1, Color(0, 0, 0));
ctx.setSource(radialGrad);
ctx.paint();
ctx.setSourceRgba(1, 1, 1, 0.8);
ctx.setLineWidth(1.0);
for(int i= 0; i<n; i++) {
vec2 p= vec2(x+(sin((index*i*speed1))+sin(index*i*speed2)*w)-i, y+sin((index+(i*spread))*speed3)*sin((index+i)*speed4)*h+i);
ctx.moveTo(p.x+(n-i), p.y+(i-n));
ctx.lineTo(p);
}
ctx.stroke();
index++;
}
CINDER_APP(pakt05App, Renderer2d, [&]( App::Settings *settings ) {
settings->setWindowSize( WIDTH, HEIGHT );
settings->setResizable( false );
})