draw_spectrum_key   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/examples/contrib/spectral_meter.xtm

Implementation

;; draw the frequency markins on the spectral meter
(bind-func draw_spectrum_key
  (let ((num_ticks:i64 8)
        (str_buf:i8* (alloc 100))
        (i:i64 0))
    (lambda (cr nbins bar_width)
      (cairo_set_source_rgb cr 1.0 1.0 1.0)
      (dotimes (i nbins)
        (if (= (modulo i (/ nbins num_ticks)) 2)
            (let ((freq (* 22050.0 (/ (i64tod i) (i64tod nbins)))))
              (cairo_move_to cr (- (* bar_width (i64tod i)) 30.0) 300.0)
              (if (< freq 1000.0)
                  (sprintf str_buf "%3.0fHz" freq)
                  (sprintf str_buf "%3.1fkHz" (/ freq 1000.0)))
              (cairo_show_text cr str_buf)))))))


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