I'm having trouble getting positive and negative Y values for a spectrogram. I can use img.scale(dt,df) to scale properly but I would actually like to scale and shift down by the half of the max frequency, like img.scale(dt, df (then - fmax/2)). I can't seem to find the source for .scale() or .setPos(), in ImageView it references the functions to ImageItem, but it is not in the ImageItem source. My only other idea is to create 2 images and scale one positive and one negative and combine them, but this doesn't seem necessary. Any ideas?
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