pakt26
See /software/p5js/pakt-februari/pakt26/ for a JavaScript version and /software/supercollider/februari-pakt/pakt26/ 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 pakt26App : public App {
public:
void setup();
void draw();
cairo::SurfaceImage srfOff;
cairo::Context ctxOff;
int index;
float w, h;
float rx, ry;
int nx, ny;
float cols, rows;
};
void pakt26App::setup() {
srfOff= cairo::SurfaceImage(WIDTH, HEIGHT, false);
ctxOff= cairo::Context(srfOff);
nx= 45;
ny= 9;
index= 0;
w= getWindowWidth();
h= getWindowHeight();
rows= ny;
ry= h/rows;
}
void pakt26App::draw() {
cols= (sin(index*0.001f+(sin(index*0.0001f)*10.0f))*0.445f+0.5f)*(nx-1);
rx= w/cols;
cairo::Context ctx(cairo::createWindowSurface());
ctxOff.setSourceRgba(0, 0, 0, 0.06);
ctxOff.paint();
for(int x= 0; x<cols; x++) {
for(int y= 0; y<rows; y++) {
float c= sin((index+(x*rows)+y)*cos(index*0.0012f)*(sin(index*0.00006f)*0.5f))*0.5f+0.5f;
float g= c*(sin(index*0.002f+(float(x)/nx*2*M_PI))*cos(index*0.0018f+(float(y)/ny*2*M_PI)))*12.0f+9.0f;
ctxOff.setSource(ColorA(1.0f, c, c, c));
ctxOff.rectangle(x*rx+g, y*ry+g, rx-(g*2), ry-(g*2));
ctxOff.fill();
}
}
index++;
ctx.copySurface(srfOff, srfOff.getBounds());
}
CINDER_APP(pakt26App, Renderer2d, [&]( App::Settings *settings ) {
settings->setWindowSize( WIDTH, HEIGHT );
settings->setResizable( false );
})