Signal Analyzer (2)

To show the density, we need a two-dimensional array to keep track the shape of the spectrum for each scan.

/* save data in vv[][] */
for(int ix=0;ix<spectrum_x;ix++) {
	int iy = (1.0-val)*density_y*0.9 + density_y*0.1;
	vv[iy][ix]++;
	if(vv[iy][ix] > vvmax) vvmax = vv[iy][ix];
}

/* density draw */
	p2 = m_image2->get_pixels();
	for (int j = 0; j < density_y; j++) {
		for (int i = 0; i < density_x; i++) {
			double vvv = double (vv[j][i]) / double (vvmax);
			*p2++ = colormap_r( vvv );
			*p2++ = colormap_g( vvv );
			*p2++ = colormap_b( vvv );
		}
	}