trapezoid~
MSP Reference
Open Help

trapezoid~

Trapezoidal wavetable

Description

trapezoid~ is a trapezoidal wavetable with signal inputs to change ramp up/down phase position. The default lo/hi points are 0. and 1., but may be changed using the lo/hi messages.

Examples

trapezoid~ generates a trapezoidal waveform that lets you specify the phase points at which it changes direction

Arguments

ramp-up [float]

Optional

A floating-point value can be used to specify the ramp up value. The arguments 0. 0. produce a ramp waveform, and 0.5 0.5 produces a triangle waveform.

ramp-down [float]

Optional

A floating-point value can be used to specify the ramp down value. The arguments 0. 0. produce a ramp waveform, and 0.5 0.5 produces a triangle waveform.

Attributes

hi [float]

Sets the maximum value of trapezoid~ for signal output. The default value is 1.0

lo [float]

Sets the minimum value of trapezoid~ for signal output. The default value is 0.

Common Box Attributes

annotation [symbol]

Sets the text that will be displayed in the Clue window when the user moves the mouse over the object.

background [int] (default: 0)

Adds or removes the object from the patcher's background layer. background 1 adds the object to the background layer, background 0 removes it. Objects in the background layer are shown behind all objects in the default foreground layer.

color [4 floats]

Sets the color for the object box outline.

fontface [int]

Sets the type style used by the object. The options are:

plain
bold
italic
bold italic

Possible values:

0 = 'regular'
1 = 'bold'
2 = 'italic'
3 = 'bold italic'

fontname [symbol]

Sets the object's font.

fontsize [float]

Sets the object's font size (in points).

Possible values:

'8'
'9'
'10'
'11'
'12'
'13'
'14'
'16'
'18'
'20'
'24'
'30'
'36'
'48'
'64'
'72'

hidden [int] (default: 0)

Toggles whether an object is hidden when the patcher is locked.

hint [symbol]

Sets the text that will be displayed in as a pop-up hint when the user moves the mouse over the object in a locked patcher.

ignoreclick [int] (default: 0)

Toggles whether an object ignores mouse clicks in a locked patcher.

patching_rect [4 floats] (default: 0. 0. 100. 0.)

Sets the position and size of the object in the patcher window.

position [2 floats]

g/s(set)

Sets the object's x and y position in both patching and presentation modes (if the object belongs to its patcher's presentation), leaving its size unchanged.

presentation [int] (default: 0)

Sets whether an object belongs to the patcher's presentation.

presentation_rect [4 floats] (default: 0. 0. 0. 0.)

Sets the x and y position and width and height of the object in the patcher's presentation, leaving its patching position unchanged.

rect [4 floats]

g/s(set)

Sets the x and y position and width and height of the object in both patching and presentation modes (if the object belongs to its patcher's presentation).

size [2 floats]

g/s(set)

Sets the object's width and height in both patching and presentation modes (if the object belongs to its patcher's presentation), leaving its position unchanged.

textcolor [float]

Sets the color for the object's text in RGBA format.

textjustification [int]

Text Justification

Possible values:

0 = 'left'
1 = 'center'
2 = 'right'

varname [symbol]

Sets the patcher's scripting name, which can be used to address the object by name in pattr, scripting messages to thispatcher, and the js object.

Messages

float

Arguments

trapezoidal-control [float]
In left inlet: Any float or signal or an input signal progressing from 0 to 1 is used to scan the trapezoid~ object's wavetable. The output of a phasor~ or some other audio signal can be used to control trapezoid~ as an oscillator, treating the contents of the wavetable as a repeating waveform.

In middle inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is .1.

In right inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is 0.9.

signal

In left inlet: Any float or signal or an input signal progressing from 0 to 1 is used to scan the trapezoid~ object's wavetable. The output of a phasor~ or some other audio signal can be used to control trapezoid~ as an oscillator, treating the contents of the wavetable as a repeating waveform.

In middle inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is .1.

In right inlet: The ramp up portion of the trapezoidal waveform, specified as a fraction of a cycle between 0 and 1.0. The default is 0.9.

Output

signal

A signal which corresponds to the value referenced by the trapezoid~ object's input signal. If the output of a phasor~ or some other audio signal is used to scan the trapezoid~ object, the output will be a periodic waveform.

See Also

Name Description
buffer~ Store audio samples
cos~ Signal cosine function (0-1 range)
phasor~ Generate sawtooth signals
wave~ Variable size wavetable
MSP Basics Tutorial 2: Adjustable Oscillator MSP Basics Tutorial 2: Adjustable Oscillator
MSP Basics Tutorial 3: Wavetable Oscillator MSP Basics Tutorial 3: Wavetable Oscillator