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 );
})