I want to create a panel to show sound frequency spectra from a MySQL table. Each spectrum is stored as a fixed length blob of 8-bit values.
I would like to have something similar to the picture below. The time series (x-value) is stored as a row in the table, and each byte in the blob value represents the intensity (z-value) for a certain frequency (y-value).
No real data treatment needs to be done. To generate 1 column of the diagram, you need to (in pseudo-code):
for (each byte in blob string)
z-value = value_of(byte)
Does this make sense?
Can this be done with the current heatmap plugin?
If not, can anyone point me to where I should modify the heatmap plugin?
Thanks in advance,