mc.zigzag~

Linked list function editor (multichannel)

Description

Use zigzag~ to generate multisegment linear ramps. This object is similar to line~, but retains information about the ramp after it has been output, and allows modification of the list values for the ramp.

Discussion

The zigzag~ object uses a linked list implementation rather than the line~ object's stack-based implementation, which does not retain information after it has been output. In addition to simply remembering the current "line", the zigzag~ object lets you modify the list by inserting, deleting, or appending points.

Each element in the zigzag~ object's linked list has a value (y), and a transition time value (delta-x), which specifies the amount of time over which the transition from one value to another will occur. When zigzag~ contains a list, this list can be triggered (the starting and ending points can be set and changed), traversed forwards or backwards at different speeds, and looped. The current position in the list can be jumped to, and also held.

Arguments

initial-value [int or float]

Optional

Sets an initial value (y) for the zigzag~ object.

Attributes

loopmode [int]

The word loopmode, followed by 1, turns on looping. loopmode 0 turns off looping. By default, looping is off. loopmode 2 turns on looping in "pendulum" mode, in which the value and time pairs are traversed in an alternating forward and reverse direction. By default, looping is off

Possible values:

0 = 'No Loop' ( looping off )
1 = 'Forward' ( forward looping on )
2 = 'Palindrome' ( palindrome looping )

mode [int]

mode specifies the way that the zigzag~ object responds to messages and signal values.
mode 0 (default): When the zigzag~ object receives a bang, it will jump to the start point (or end point if our direction is negative) and begin outputting values from there. The time value associated with this jump has its length defined by the bangdelta message. The default value for bangdelta is 0. If a signal is connected to the left inlet of the zigzag~ object in this mode, the current index of the list is determined by the signal; any previously set speed, loopmode, start, and end messages are ignored.

mode 1: behavior is exactly the same as in mode 0 in terms of the effect of a bang. In mode 1, signal inputs are handled differently. If a signal is connected to the left inlet of the zigzag~ object in mode 1, the input signal functions as a trigger signal; when the slope of the input signal changes from non-negative to negative, the object will be re-triggered as though a bang were received.

mode 2: jump to the next index in the list (or the previous index, if the current direction is negative) and begin outputting values from there. The time value associated with this jump has its length defined by the bangdelta message. The default value for bangdelta is 0. If a signal is connected to the left inlet of the zigzag~ object in mode 2, the input signal functions as a trigger signal; when the slope of the input signal changes from non-negative to negative, the object will be re-triggered as though a bang were received.

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]

Sets the justification for the object's text.

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.

Multichannel Group Attributes

chans [int]

The chans attribute sets the number of channels and instances in the MC wrapper object. If you want a fixed number of channels regardless of what is connected to the object, you could set chans via a typed-in argument, for example typing mc.cycle~ @chans 100 would create 100 instances of a cycle~ object inside the MC wrapper. If chans is 0, the wrapper object will auto-adapt to the number of channels in its input multichannel signals (using the maximum of all connected signals). For objects without connected multichannel signals, the chans attribute will need to have a non-zero value if you want more than one instance.

If chans is changed while the audio is on, the number of instances will not updated until audio is restarted. However, if chans is reduced while the audio is on, any extra channels will no longer process audio and will output a zero signal.

values [int]

The values attribute only applies to object creation time so it must be set via typed-in argument syntax. values sets the first (and only the first) initial argument for successive instances in the MC wrapper. For example, typing mc.cycle~ @chans 4 @values 50 60 70 80 would assign an initial frequency to the cycle~ instances inside the wrapper. The first instance would be assigned a frequency of 50, the second a frequency of 60, the third 70, and the fourth 80. Note that values does not determine the actual instance count; this can be done using the chans attribute. If there are more instances than elements for the values attribute, those instances are instantiated with the default value.

If you want to set a default initial value for all instances, simply type it as an argument before any typed-in attributes. For example, modifying our example above: mc.cycle~ 100 @chans 10 @values 50 60 70 80. In this example, the first four instances are set as before, but the next six are created with a frequency argument of 100.

To change instance values or attributes after the wrapper object has been created, use the setvalue, applyvalues, or replicatevalues messages.

replicate [int]

When replicate is enabled, input single-channel or multichannel signals containing fewer channels than the number instances in the MC wrapper object are repeated to fill all input channels. For example, when replicate is enabled and you connect a two-channel multichannel signal to the input of an MC wrapper object with four instances, channel 1 of the input will be repeated to channel 3, and channel 2 of the input will be repeated to channel 4. If replicate were disabled, channels 3 and 4 of the input would be set to zero.

target [int]

The target attribute sets a voice index for targeting specific wrapper instances. Subsequent messages are directed to an individual instance instead of all instances. It is strongly recommended you use the more reliable setvalue message instead of the target attribute. The voice index of setvalue will override the current setting of target. When target is 0, incoming messages are sent to all instances. When target is -1, incoming messages do nothing.

usebusymap [int]

When usebusymap is enabled, the MC wrapper controls whether individual instances process audio using a busy map maintained by either an mc.noteallocator~ or mc.voiceallocator~ object. When a channel in the busy map is marked as "free" or "released" no audio processing occurs by any instance on the channel corresponding to the voice index. When usebusymap is disabled, instances in the MC wrapper process audio at all times. This will also be true if usebusymap is enabled and there is no local or named busy map available. (See the busymapname attribute for a description of local and named busy maps).

zero [int]

When the zero attribute is enabled, channels in the MC wrapper due to the use of a busy map output zero signals. To save a small amount of CPU at the risk of loud and unpleasant noises due to uncleared signal data, you can disable zero. In this case, disabled channels in the MC wrapper do nothing to their output channels. If usebusymap is disabled or there is no active local or named busy map available, the setting of the zero attribute has no effect.

Conveniently, when usebusymap is enabled in mc.mixdown~ object, disabled channels are not mixed to the output. When unused signals from wrapped objects with zero disabled feed into mc.mixdown~, they will be ignored, reducing the risk of unpleasantness getting past the mix output.

busymapname [symbol]

When the usebusymap attribute is enabled, an MC wrapper object uses the local busy map of any mc.voiceallocator~ or mc.noteallocator~ in the same patcher by default. To use a named global busy map instead, set the busymapname attribute to the desired name.

Messages

bang

In left inlet: The zigzag~ object responds to a bang message according to its mode of behavior, which is set using the mode message.

If the zigzag~ object is set to mode 0 or mode 1, a bang message will cause the zigzag~ object to go to the start point (or end point if the direction is negative) and begin outputting values from there.

If the zigzag~ object is set to mode 2, a bang message will cause the zigzag~ object to jump to the next index in the list (or the previous index, if the current direction is negative) and begin outputting values from there.

int

Arguments

output-rate-coefficient [int]
In left inlet: Converted to float.

In right inlet: Specifies the rate at which the value and time pairs will be output. A value of 1.0 traverses the list forward at normal speed. A playback rate of -1 traverses the list backwards (i.e. in reverse). A value of .5 traverses the linked list at half the normal speed (effectively doubling the delay time values).

(In left inlet: Converted to float.)

float

Arguments

output-rate-coefficient [number]
In left inlet: Each element in the zigzag~ object's linked list is a pair that consists of a target value (y), followed by a second number that specifies a total amount of time in milliseconds (delta-x). In that amount of time, numbers are output regularly in a line from the current index value to the target value. The list 0 0 3.5 500 10 1000 describes a line which begins with a value of 0 at time 0, rises to a value of 3.5 a half second later, and rises again to a value of 10 in 1 second.

In right inlet: Specifies the rate at which the value and time pairs will be output. A value of 1.0 traverses the list forward at normal speed. A playback rate of -1 traverses the list backwards (i.e. in reverse). A value of .5 traverses the linked list at half the normal speed (effectively doubling the delay time values).

list

Arguments

index and event-pair [list]
Performs the same function as append (without the word, "append").

append

Arguments

value [number]
transition-time [number]
The word append, followed by a list, will add new event pair(s) to the end of the current list.

bangdelta

Arguments

transition-time [number]
In left inlet: The word bangdelta, followed by a float or int, specifies the time over which the transition between values occurs when the zigzag~ object receives a bang. The default is 0 (i.e., and immediate transition).

bound

Arguments

start-index [int]
end-index [int]
In left inlet: The word bound, followed by two numbers which specify start and end indices (where 0 is the first element), sets the start and end points of the zigzag~ object's linked list.

delete

Arguments

index [int/list]
In left inlet: The word delete, followed by an int which specifies a position (where 0 is the first element), will delete the value and time pair associated with that index from the list. A list can follow the delete message if you want to remove multiple event pairs from the list. The message delete 0 will remove the current first value and time pair from the list; the second value and time pair (i.e. the value and time pair at index 1) will now become the first values in the list.

dump

In left inlet: The word dump will cause a list consisting of all currently stored value and time pairs in the form

index value delta-x

to be sent out the zigzag~ object's 3rd outlet.

end

Arguments

end-index [int]
In left inlet: The word end, followed by an int which specifies a position (where 0 is the first element), sets the point at which the zigzag~ object ceases its output when triggered by a bang.

insert

Arguments

index and event-pair [list]
In left inlet: The word insert, followed by an int which specifies a position (where 0 is the first element) and a list, will insert new event pair(s) before the index specified. The message insert 0 5 500 will create a new first entry in the linked list (at the 0 index) with a value of 5 and a time of 500 milliseconds.

jump

Arguments

index and transition-time [list]
In left inlet: The word jump, followed by an int which specifies a position (where 0 is the first element), skips to that point in the linked list and begins outputting value and time pairs from that point. An optional int can be used to specify the time, in milliseconds, over which the transition to the next value will occur (the default value is 0).

jumpend

Arguments

transition-time [number]
In left inlet: The word jumpend causes the zigzag~ object to immediately jump forward to the last value (y)on the linked list.

jumpstart

Arguments

transition-time [number]
In left inlet: The word jumpstart causes the zigzag~ object to immediately jump to the first value (y)on the linked list and then output the currently selected list or selected portion of the list.

next

Arguments

transition-time [number]
In left inlet: The word next skips to the next value and time pair in the linked list. An optional int can be used to specify the time over which the transition to the next value will occur (the default value is 0).

prev

Arguments

transition-time [number]
In left inlet: The word prev skips to the previous value and time pair in the linked list. An optional int can be used to specify the time over which the transition to the previous value will occur (the default value is 0).

print

In left inlet: The word print causes the current status and contents of the zigzag~ object to be printed out in the Max Console. The output consists of the current mode, loopmode, the start, end, and loop length of the current list, the pendulum state, and moving value of the object, followed by a listing of each index in the linked list, along with its y and delta-x values.

ramptime

Arguments

transition-time [number]
In left inlet: The word ramptime, followed by a number, sets the ramp time, in milliseconds, at which the output signal will arrive at the target value.

setindex

Arguments

index [int]
value [number]
transition-time [number]
In left inlet: The word setindex, followed by an int which specifies a position (where 0 is the first element) and a pair of floats, sets the target value (y) and transition time amounts (delta-x) for the specified position in the list.

signal

In left inlet: The zigzag~ object responds to signal values according to its mode of behavior, which is set using the mode message.
If the zigzag~ object is set to mode 0, the current index of the list is determined by the input signal value; any previously set speed, loopmode, start, and end messages will be ignored.
If a signal is connected to the left inlet of the zigzag~ object in mode 1, the input signal functions as a trigger signal; when the slope of the input signal changes from non-negative to negative, the object will be re-triggered as though a bang were received.
If a signal is connected to the left inlet of the zigzag~ object in mode 2, the input signal functions as a trigger signal; when the slope of the input signal changes from non-negative to negative, the object will be re-triggered as though a bang were received.

In right inlet: A signal value specifies the rate at which the value and time pairs will be output. A value of 1.0 traverses the list forward at normal speed. A playback rate of -1 traverses the list backwards (i.e. in reverse). A signal value of .5 traverses the linked list at half the normal speed (effectively doubling the delay time values). The value of the input signal is sampled once per input vector. Therefore, any periodic frequency modulation with a period which is greater than the current sample rate/(2*vector_size) will alias.

skip

Arguments

number-of-skipped-indices and transition-time [list]
In left inlet: The word skip, followed by a positive or negative number, will skip the specified number of indices in the zigzag~ object's linked list. Positive number values skip forward, and negative values skip backward. An optional integer can be used to specify the time over which the transition to the next or previous value will occur (the default value is 0).

speed

Arguments

output-rate [number]
In left inlet: The word speed, followed by a positive or negative floating-point number, specifies the rate at which the value and time pairs will be output. The message speed 1.0 traverses the list forward at normal speed, speed -1 traverses the list backwards, speed .5 traverses the linked list at half the normal speed (effectively doubling the delay time values).

start

Arguments

start-index [number]
In left inlet: The word start, followed by an int which specifies a position (where 0 is the first element), sets the point at which the zigzag~ object begins its output when triggered by a bang.

stop

Sending the stop message causes the ramp to stop at the current position.

Multichannel Group Messages

deviate

Arguments

range [float]
message-name [symbol]
center-value [float]
Generate a random value for each channel around a center value. If no message name is provided then a float message is used by default.

exponential

Arguments

exponent [float]
base [float]
The exponential message generates an exponential series using the second argument as a base and the first argument as an exponent.

scaledexponential

Arguments

exponent [float]
base [float]
The scaledexponential message generates an exponential series using the second argument as a base and the first argument as an exponent. Values are scaled by the instance number, so the total range of the series is independent of the number of channels.

increment

Arguments

increment-amount [float]
message-name [symbol]
start-value [float]
Generate a increasing value for each channel starting at a specified value. If no message name is provided then a float message is used by default.

harmonic

Arguments

multiplier [float]
fundamental [float]
The harmonic message generate a harmonic series using the second argument as the fundamental frequency and the first argument as a multiplier.

subharmonic

Arguments

multiplier [float]
fundamental [float]
The subharmonic message generate a subharmonic series using the second argument as the fundamental frequency and the first argument as a multiplier.

spread

Arguments

boundary-value [float]
message-name [symbol]
other-boundary-value [float]
Generate a range of values distributed to each channel. If no message name is provided then a float message is used by default. The first boundary value is included in the range outputs, but the last boundary value is not.

spreadinclusive

Arguments

boundary-value [float]
message-name [symbol]
other-boundary-value [float]
Generate a range of values distributed to each channel. If no message name is provided then a float message is used by default. Both the first and last boundary values are included in the range outputs.

spreadexclusive

Arguments

boundary-value [float]
message-name [symbol]
other-boundary-value [float]
Generate a range of values distributed to each channel. If no message name is provided then a float message is used by default. Neither the first nor last boundary values are included in the range outputs.

spreadincludefirst

Arguments

boundary-value [float]
message-name [symbol]
other-boundary-value [float]
Generate a range of values distributed to each channel. If no message name is provided then a float message is used by default. The first boundary value is included in the range outputs, but the last boundary value is not. The spreadincludefirst message is the same as the spread message.

spreadincludesecond

Arguments

boundary-value [float]
message-name [symbol]
other-boundary-value [float]
Generate a range of values distributed to each channel. If no message name is provided then a float message is used by default. The first boundary value is not included in the range outputs, but the last boundary value is included.

setvalue

Arguments

channel [int]
message [symbol]
message arguments [list]
The word setvalue, followed by both a channel index (starting at 1) and any message that can be sent to the wrapped object, sends the message to an individual instance within the MC wrapper. setvalue 0, followed by a message, sends the message to all instances. The setvalue message can be used in any inlet.

applyvalues

Arguments

message-name [symbol]
values [list]
The word applyvalues, followed by an optional message name and one or more message arguments, sends individual values in the arguments successively to instances in the MC wrapper, starting with the first instance. For example, the message applyvalues 4 5 6 will send 4 to the first instance, 5 to the second instance, and 6 to the third instance. If there are more instances than arguments to applyvalues, the extra instances are unaffected.

replicatevalues

Arguments

message-name [symbol]
values [list]
The word replicatevalues, followed by an optional message name and one or more message arguments, sends individual values in the arguments successively to instances in the MC wrapper, starting with the first instance. Unlike applyvalues, the replicatevalues message continues sending values to successive instances, restarting with the first element, if it runs out of arguments to send. For example, replicatevalues 4 5 to an MC wrapper object with three instances will send 4 to the first instance, 5 to the second instance, and 4 to the third instance.

Output

bang

Out right outlet: When looping, a bang message is sent out when the loop (re-trigger) point is reached. A bang is also sent out when zigzag~ has finished generating all of its ramps.

list

Out 3rd outlet: In response to the dump message, a list consisting of all currently stored value and time pairs in the form

index value (y) delta-x

is output.

signal

Out 1st outlet: The current target value, or a ramp moving toward the target value according to the currently stored value and the target time.

Out 2nd outlet: The current index.

See Also

Name Description
adsr~ ADSR envelope generator
curve~ Exponential ramp generator
kink~ Distort a sawtooth waveform
line~ Linear ramp generator