and with this it’s almost exactly the same… except that contour-intervals does some kind of smoothing (plot (contour-intervals mandelbrot -2.25 0.75 -1.25 1.25 #:colors (build-list 255 (λ (i) (list (* 5 (modulo i 15))(* 32 (modulo i 7))(* 8 (modulo i 31))))) #:contour-widths '(0) #:contour-styles '(transparent) #:levels 255 #:samples 200))

@wanpeebaw I knew new I wasn’t alone!

a heat map renderer would need to work differntly: • the input data is a 2d array of real numbers • the renderer maps these values onto colors using a color map, either continuous or discrete • it needs to work fast (for interactive plots) with large amounts of data, at least 4000x4000

oh, and the renderer would need to print the color map next to the axis

Here is an example of what I would like a heat map renderer to be able to do. note that it should also render this fast, so the plot can be zoomed reasonably quickly…