pakt09
See /software/p5js/pakt-februari/pakt09/ for a JavaScript version and /software/supercollider/februari-pakt/pakt09/ 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 pakt09App : public App {
public:
void setup();
void draw();
int index, n, m;
float rows, cols;
float magic;
};
void pakt09App::setup() {
index= 0;
n= 1000;
m= 0;
rows= 3;
cols= 4;
magic= 50;
}
void pakt09App::draw() {
cairo::Context ctx(cairo::createWindowSurface());
float w= getWindowWidth();
float h= getWindowHeight();
cairo::GradientRadial radialGrad(getWindowCenter(), 0, getWindowCenter(), getWindowWidth());
radialGrad.addColorStop(0, Color(0.5, 0.5, 0.5));
radialGrad.addColorStop(1, Color(0, 0, 0));
ctx.setSource(radialGrad);
ctx.paint();
ctx.setSourceRgba(1, 1, 1, 0.85);
if(m<n) {
m= m+1;
}
for(int i= 0; i<m; i++) {
vec2 p= vec2(fmod((rows+i), w), fmod((cols+i)*(fmod(i, magic)), h));
ctx.rectangle(p, p+vec2(8*sin((index+i)*0.012), 8*cos((index+i)*0.011)));
}
ctx.fill();
magic= magic+(sin(index*0.001)*0.01);
rows= rows+(sin(index*0.0004));
cols= cols+(sin(index*0.0005));
index++;
}
CINDER_APP(pakt09App, Renderer2d, [&]( App::Settings *settings ) {
settings->setWindowSize( WIDTH, HEIGHT );
settings->setResizable( false );
})