pakt17
See /software/p5js/pakt-februari/pakt17/ for a JavaScript version and /software/supercollider/februari-pakt/pakt17/ 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 pakt17App : public App {
public:
void setup();
void draw();
int index;
float w, h;
float a, b, c, d;
float spread;
int n;
};
void pakt17App::setup() {
index= 0;
w= getWindowWidth();
h= getWindowHeight();
n= 45;
}
void pakt17App::draw() {
spread= sin(index*0.004f)*5.0f+6.0f;
cairo::Context ctx(cairo::createWindowSurface());
ctx.setSourceRgb(0.0, 0.0, 0.0);
ctx.paint();
//ctx.setLineWidth(15.0);
for(int i= 0; i<n; i++) {
a= sin(((i*spread)+index)*sin(index*0.0050+(sin(index*0.0074+1.0f)+1.0f))*0.0075f+1.0f)*0.25f+0.5f;
b= sin(((i*spread)+index)*sin(index*0.0051+(sin(index*0.0073+2.0f)+2.0f))*0.0075f+2.0f)*0.25f+0.5f;
c= sin(((i*spread)+index)*sin(index*0.0052+(sin(index*0.0072+3.0f)+3.0f))*0.0075f+3.0f)*0.25f+0.5f;
d= sin(((i*spread)+index)*sin(index*0.0053+(sin(index*0.0071+4.0f)+4.0f))*0.0075f+4.0f)*0.25f+0.5f;
ctx.setSourceRgba(a, b, c, d);
ctx.rectangle(vec2(a*w, b*h), vec2(c*w, d*h));
ctx.fill();
//ctx.stroke();
}
index++;
}
CINDER_APP(pakt17App, Renderer2d, [&]( App::Settings *settings ) {
settings->setWindowSize( WIDTH, HEIGHT );
settings->setResizable( false );
})