96 lines
2.4 KiB
Text
96 lines
2.4 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{FreqScope}
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Frequency spectrum visualizer@section{categories}
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GUI>Interfaces
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@section{related}
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Classes/FreqScopeView
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@section{description}
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FreqScope shows the frequency spectrum of the specified audio bus. The scope will remain active after a command-period. To turn it off you must either click off the 'Power' button or close the window.
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Panel commands:
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@section{table}
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## Power || Turns the scope on and off. This is useful for freezing the signal on the display or for saving CPU.
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## BusIn || The audio bus to be analyzed.
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## FrqScl || Determines the mapping of frequencies on the x-axis. Can be linear (lin) or logarithmic (log). Logarithmic is equal spacing per musical octave.
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## dbCut || Determines the lowest decibel shown on the y-axis.
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::
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@section{ClassMethods}
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@section{method}
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new
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@section{argument}
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width
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Default value is 512.
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@section{argument}
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height
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Default value is 300.
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@section{argument}
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busNum
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The number of the audio link::Classes/Bus:: to be monitored.
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@section{argument}
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scopeColor
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An instance of link::Classes/Color::. The drawing color of the scope.
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@section{argument}
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bgColor
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An instance of link::Classes/Color::. The background color of the scope.
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@section{argument}
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server
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the server whose buses to show on scope.
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@section{discussion}
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Example:
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@racketblock[
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s.boot;
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// create a new analyzer
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FreqScope.new(400, 200, 0, server: s);
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// basic sine
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{ SinOsc.ar(2000, 0, 0.25) }.play(s);
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// random saw
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{ RLPF.ar(Saw.ar(110, 0.2), LFNoise2.kr(1,1e4,1e4), LFNoise2.kr(1, 0.2, 0.22)) }.play(s);
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// modulate phase
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{ SinOsc.ar(800, SinOsc.ar(XLine.kr(20, 8000, 10), 0, 2pi), 0.25) }.play(s);
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// all harmonics
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{ Blip.ar(200, Line.kr(1, 100, 10), 0.2) }.play(s);
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::
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]
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@section{subsection}
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Subclassing and Internal Methods
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The following methods are usually not used directly or are called by a primitive. Programmers can still call or override these as needed.
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@section{method}
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scopeOpen
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Returns a link::Classes/Boolean::, whether the scope is open.
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@section{InstanceMethods}
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@section{subsection}
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Subclassing and Internal Methods
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The following methods are usually not used directly or are called by a primitive. Programmers can still call or override these as needed.
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@section{method}
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window
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Returns the window in which the link::Classes/FreqScopeView:: is placed.
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@section{method}
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scope
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Returns the link::Classes/FreqScopeView::.
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