Convert

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The {{Literal|Transformation}} parameter of a {{l|Group Layer}} and {{l|Switch Layer}} is a composite parameter, it hold an {{l|Offset Parameter|Offset}}, {{l|Rotation Parameter|Rotation}}, {{l|Skew Parameter|Skew}} and {{l|Scale Parameter|Scale}} subparameter for the group.
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The {{Literal|Transformation}} parameter of a {{l|Group Layer}} and {{l|Switch Group Layer}} is a composite parameter, it hold an {{l|Offset Parameter|Offset}}, {{l|Rotation Parameter|Rotation}}, {{l|Skew Parameter|Skew}} and {{l|Scale Parameter|Scale}} subparameter for the group.
  
 
=== Cos ===
 
=== Cos ===

Revision as of 15:10, 5 March 2015

Languages Language: 

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Right-clicking on a value in the Parameters Panel brings up a context menu which has a sub-menu called "Convert". The "Convert" menu allows you to specify that the parameter should be controlled automatically in various ways or used in mathematical formulas. Depending on the type of the parameter the Convert menu will contain different options.

To convert the parameter back to its original type, select "Disconnect" from its context menu.

Convert Types

Add

Converting a parameter to "Add" adds three sub-parameters, the first two of which are the same type as the parameter itself:

  • <param> "LHS"
  • <param> "RHS"
  • real "Scalar"

The "Add" conversion can be used with parameters of type angle, color, gradient, integer, real, time, and vector.

The resulting value is: 

  (LHS + RHS) * Scalar

And

Converting a bool parameter to "And" adds two sub-parameters:

  • bool "Link1"
  • bool "Link2"

The resulting value is true only if both Link1 and Link2 are true.


Angle String

Converting an string-valued parameter to "Angle String" adds four sub-parameters:

  • angle "Angle"
  • integer "Width"
  • integer "Precision"
  • bool "Zero Padded"

The resulting value a string containing the value of "Angle" (in degrees) formatted as a string with a minimum width "Width", with "Precision" decimal places. If "Zero Padded" is true, it will be left-padded with 0 characters.

aTan2

Converting an angle-valued parameter to "aTan2" adds two sub-parameters:

  • real "X"
  • real "Y".

The resulting value is: 

  atan2(y,x)

ie. atan(y/x) but without an error when x is 0. The value is the angle between the x axis and the vector (x,y).

Spline

Converting a list parameter to "Spline" doesn't seem to change anything. Perhaps that's the default type for lists of vertices, such as are found in outlines and regions?

Compare

Converting a bool parameter to "Compare" adds five sub-parameters:

  • real "LHS"
  • real "RHS"
  • bool "Greater than"
  • bool "Equal to"
  • bool "Less than"

The valuenode compares "LHS" and "RHS". The three boolean values determine which comparison returns true. For example, if LHS>RHS and "Greater than" is checked, the valuenode will evaluate to true.

Composite

Converting a Spline Point parameter to "Composite" adds six sub-parameters:

  • vector "Vertex"
  • real "Width"
  • real "Origin"
  • bool "Split Tangents"
  • vector "Tangent 1"
  • vector "Tangent 2"

Converting a color parameter to "Composite" adds four real-valued sub-parameters:

  • real "Red"
  • real "Green"
  • real "Blue"
  • real "Alpha"

Converting a segment parameter to "Composite" adds four vertex sub-parameters:

  • vertex "Vertex 1"
  • vertex "Tangent 1"
  • vertex "Vertex 2"
  • vertex "Tangent 2"

Converting a vector parameter to "Composite" adds two real-valued sub-parameters:

  • real "X-Axis"
  • real "Y-Axis"

The resulting value is a Spline Point, Color, Segment, or Vector made by combining the component parts.

Composite for Group Layer

The "Transformation" parameter of a Group Layer and Switch Group Layer is a composite parameter, it hold an Offset, Rotation, Skew and Scale subparameter for the group.

Cos

Converting a real-valued parameter to "Cos" adds two sub-parameters:

  • angle "Angle"
  • real "Amplitude".

The resulting value is: 

  "Amplitude" * cos("Angle")

Derivative

It allows to calculate the derivative (first or second order) of a given value node using the finite differences method. It has the following sub parameters:

  • real "Link" : Value Node whom is calculated the derivative (Real, Angle, Time, Vector)
  • real "Interval" : Size of the interval to calculate the finite differences (Real >0).
  • integer "Accuracy" : Accuracy order. (ROUGH, NORMAL, FINE & EXTREME)
  • integer "Order" : First or Second order derivative (FIRST, SECOND)

Dot Product

Converting a real or angle parameter to a "Dot Product" adds two sub-parameters:

  • vector "LHS"
  • vector "RHS"

If the converted value is an angle, the return value is the angle between the two vectors: 

return = acos((LHS · RHS) / (|LHS| * |RHS|))

If the converted value is a real, the result value is the dot product of the two vectors: 

return = LHS · RHS = |LHS| * |RHS| * cos(alpha)

(where alpha is the angle between "LHS" and "RHS").

Duplicate

This ValueNode type is only used by the Duplicate Layer. It never appears in the "Convert" menu. It is used to control the range of the Index in the Duplicate Layer (q.v.).

The "Duplicate" ValueNode type has 3 real-valued sub-parameters:

  • real "From"
  • real "To"
  • real "Step"

The value of the ValueNode varies from the value of "From" to the value of "To" in steps of size "Step". The sign of "Step" is ignored. If From<To the steps are positive, else they're negative.

Dynamic

Allows to link two vectors with a dynamic link. The ValueNode (vector type) that is converted to "Dynamic" will be linked to another vector value using a linear/rotational spring system with damping and friction.

Once you convert the Value to "Dynamic" it offers the following sub-parameters:

  • vector "Tip Static" This is the equilibrium position of the system without external forces relative to the Origin. See Origin. Since it is a vector its length is used for the linear spring equilibrium length and its angle form the x axis is used for the torsion spring equilibrium angle. The initial value of this subparameter is the current value of the Value that is being converted to Dynamic.
  • vector "Origin" This is the basement of the dynamic system. Defaults to (0.0, 0.0). If the user changes this value the final equilibrium calculated position of the value is modified too. Accelerations of the Origin are used to move the Tip due to the fictitious forces needed to apply under non inertial reference systems.
  • vector "Force" External force applied on the Tip of the dynamic system. Defaults to (0.0, 0.0).
  • real "Torque" External momentum applied tot he dynamic system at the Origin. Defaults to 0.0.
  • real "Damping" Damper coefficient of the linear link. Defaults to 0.4
  • real "Friction" Friction coefficient of the rotational link. Defaults to 0.4
  • real "Spring" Spring coefficient of the linear link. Defaults to 30.0
  • real "Torsion" Torsion coefficient of the rotational link. Defaults to 30.0
  • real "Mass" Mass of the dynamic system. Defaults to 0.3
  • real "Inertia" Moment of inertia of the dynamic system. Defaults to 0.3
  • bool "Spring rigid" When checked linear spring is rigid. Defaults to off
  • bool "Torsion rigid" When checked torsion spring is rigid. Defaults to off
  • bool "Origin drags tip" When checked result is origin + dynamic tip otherwise result is just dynamic tip. Defaults to off

Comments

The movement of the Origin produces two effects. It drags the resulting vector the same amount of the Origin along the time (that is the resulting vector is the sum of the Origin(t) + dynamic tip(t)) and its acceleration produces an inertial force contrary to the acceleration direction and magnitude.

The Torque only affects the angle of the resulting vector respect to the Origin. This means that the mass center of gravity is located at the origin (where the torque is applied) and so there is not centrifugal effects.

Since the Origin only can be translated and not rotated, there are not Coriolis forces.

The Force is applied on the tip position so it would produce effects on the angle and on the length of the tip. Force (F) is decomposed into two vectors one aligned with the Tip vector (Fr) and other perpendicular (Fa). The one aligned (Fr) is used on the linear damper spring equations. The one perpendicular (Fa) is used as additional torque by this expression Fr*R (where R is the variable length of the Tip vector)

If Mass (Inertia) reaches near to zero, then the movement for linear (rotational) link is disabled.

User is responsible of the meaning of the values of the parameters (i.e. negative mass, or negative friction or spring constant)

Origin is automatically connected to a subparameter of an internal Value Node in order to calculate the second derivative of the Origin (that is the acceleration of the Origin). Do not Disconnect Origin value node. Export it instead and link or connect other Value Nodes to the exported.

Dynamic List

Converting a list parameter to "Dynamic List" seems to replace each of the "Vertex NNN" sub-parameters with "Item NNN" parameters which can't be expanded, but can be Exported.

Exponential

Converting a real parameter to "Exponential" adds two sub-parameters:

  • real "Exponent"
  • real "Scale"

The resulting value is the result raising the mathematical constant 'e' to the power of "Exponent", and scaling the result by "Scale". That is, it returns: 

 Scale * e^Exponent

This is useful for tracking layers which have been zoomed, since the Zoom Layer scales by e^(zoom factor).

See this video for an example of the use of this convert type.

From Integer

This is currently disabled. It converts an integer to one of several types.

Gradient Color

Converting a color parameter to "Gradient Color" adds two sub-parameters:

  • gradient "Gradient"
  • real "Index"

The resulting value is a color taken from the Gradient Tool at the given index position. "Index" 0 corresponds to the left of the "Gradient"; "Index" 1 corresponds to the right of the "Gradient".

Gradient Rotate

Converting a gradient parameter to "Gradient Rotate" adds two sub-parameters:

  • gradient "Gradient"
  • real "Offset"

The resulting value is a gradient based on the "Gradient" parameter, but shifted left (for negative values) or right, according to the value of the "Offset" parameter. An offset of 1.0 will shift the gradient by its entire visible width. Values shifted off the left or right edge aren't lost - they aren't visible in the gradient as it's displayed in the parameters dialog, but they will still be used when rendering (depending on parameters such as "Loop" and "Zigzag", which can cause gradients to be looped between their their left and right edges, rather than using the non-displayed parts).

Int String

Converting an string-valued parameter to "Int String" adds three sub-parameters:

  • integer "Int"
  • integer "Width"
  • bool "Zero Padded"

The resulting value a string containing "Int" formatted as a string with a minimum width "Width". If "Zero Padded" is true, it will be left-padded with "0" characters.

Joined List

Converting a string parameter to be "Joined List" adds four sub-parameters:

  • list "Strings"
  • string "Before"
  • string "Separator"
  • string "After"

The result is a string containing the value of "Before", followed by all the strings in the "Strings" list, with the value of "Separator" between each pair, followed by the value of "After".

Linear

Converting an angle parameter to be "Linear" adds two angle sub-parameters:

  • angle "Rate"
  • angle "Offset"

Converting a color parameter to be "Linear" adds two angle sub-parameters:

  • color "Rate"
  • color "Offset"

Converting an integer parameter to be "Linear" adds two angle sub-parameters:

  • integer "Rate"
  • integer "Offset"

Converting a real parameter to be "Linear" adds two real-valued sub-parameters:

  • real "Rate"
  • real "Offset"

Converting a time parameter to be "Linear" adds two time sub-parameters:

  • time "Rate"
  • time "Offset"

Converting a vector parameter to be "Linear" adds two vector sub-parameters:

  • vector "Slope"
  • vector "Offset"

The parameter's value will change linearly over time, starting with the value specified by "Offset" at time zero, and increasing by the value specified by "Rate" (or "Slope", in the case of vector parameters) every second.

The resulting value for vector parameters is: 

  Offset + Slope*time

and for the other 5 types of parameter it is: 

  Offset + Rate*time

Logarithm

Converting a real-valued parameter to "Logarithm" adds three sub-parameters:

  • real "Link"
  • real "Epsilon".
  • real "Infinite".

The resulting value is: 

 Log(Link) (if Link >= Epsilon)
 -Infinite (if Link < Epsilon)

The "Epsilon" and "Infinite" parameters are only needed to prevent logarithm of negative or zero numbers. For regular operation the resulting value is simply the natural logarithm of "Link". In fact a logarithm of a negative number cannot be calculated in the space of Real numbers. This convert type returns -Infinite for simplicity.

Not

Converting a bool parameter to "Not" adds one sub-parameter:

  • bool "Link"

The resulting value is the opposite of "Link".

Or

Converting a bool parameter to "Or" adds two sub-parameters:

  • bool "Link1"
  • bool "Link2"

The resulting value is true if either "Link1", "Link2", or both are true.

Power

Converting a real-valued parameter to "Power" adds three sub-parameters:

  • real "Base"
  • real "Power"
  • real "Epsilon".
  • real "Infinite".

The resulting value is Base^Power if the operation is defined. The undefined cases will also return a value (to avoid errors): 

  0^0 = 1
  0^-x = +/- infinite
  If a negative base is raised to a noninteger power, the power is rounded (typecast) to an integer

The "Epsilon" and "Infinite" parameters are only needed to prevent division by zero.

Radial Composite

Converting a color to "Radial Composite" adds four sub-parameters:

  • real "Luma"
  • real "Saturation"
  • angle "Hue"
  • real "Alpha"

Converting a vector to "Radial Composite" adds two sub-parameters:

  • real "Radius"
  • angle "Theta"

For color parameters, the resulting value is the color with the given "Luma", "Saturation", "Hue", and "Alpha" amounts.

For vector parameters, the resulting value is the point reached by traveling a distance "Radius" from the origin, in the distance given by the angle "Theta".

Random

Converting a parameter to "Random" adds five sub-parameters, the first of which is the same type as the converted parameter:

  • <param> "Link"
  • real "Radius"
  • integer "Seed"
  • real "Animation Speed"
  • integer "Interpolation"
  • real "Loop Time"

"Random" can be used on angles, colors, integers, reals, times, and vectors.

It is used to cause a parameter's value to vary randomly over time, around a central value:

  • "Link" provides the central value.
  • "Radius" defines the maximum random difference.
  • "Seed" seeds the random number generator
  • "Animation Speed" defines how often a new random value is chosen (in choices per second)
  • "Interpolation" determines how the value is interpolated from one random choice to the next. Possible values are:
    • 0 - no interpolation; the value jumps from one value to the next
    • 1 - linear interpolation
    • 2 - cosine
    • 3 - spline
    • 4 - cubic (the default); uses Catmull-Rom spline interpolation
  • "Loop Time" makes the random value repeat after the given time. The value ends up the same at the given time as at time=0 so it's possible to make random looping animations without a nasty jump when the time wraps back to zero.

The "Interpolation" sub-parameter should really be a drop-down menu, rather than an integer field, but that isn't yet implemented.

Range

Converting a parameter to "Range" adds three sub-parameters, all the same type as the parameter itself:

  • <param> "Min"
  • <param> "Max"
  • <param> "Link"

"Range" can be used on angles, integers, reals, and times.

It is used to limit the value of the linked parameter to be between "Min" and "Max".

The resulting value is: 

  Min (if Link < Min)
  Max (if Link > Max)
  Link (otherwise)

Real String

Converting a string parameter to "Real String" adds four sub-parameters:

  • real "Real"
  • int "Width"
  • int "Precision"
  • bool "Zero Padded"

The result is a string formatted to contain the given value "Real". "Width" specifies the minimum field width, "Precision" specifies the number of decimal places and "Zero Padded" specifies whether to pad with zeros on the left hand side.

For example, with Real=3.1415, Width=6, Precision=2, and ZeroPadded=true, we get: 

 "003.14"

(6 characters long, 2 decimal places, and padded with zeros on the left).

Reciprocal

Converting a real-valued parameter to "Reciprocal" adds three sub-parameters:

  • real "Link"
  • real "Epsilon".
  • real "Infinite".

The resulting value is: 

  1/Link (Link <= -epsilon or epsilon <= Link)
  Infinite (if 0 <= Link < epsilon)
  -Infinite (if -epsilon < Link < 0)

The "Epsilon" and "Infinite" parameters are only needed to prevent division by zero. For regular operation the resulting value is simply the reciprocal of "Link".

Reference

Converting a parameter to "Reference" adds a single sub-parameter called "Link". The "Link" parameter is the same type as the parameter being converted.

It doesn't seem to do anything at all, other than adding an extra parameter. Whatever value is put into "Link" becomes the value of the parameter being converted.

The only use for this conversion type I can think of is the following:

  • you know that point A should follow point B, so you export point B and connect point A to it
  • you're not yet sure exactly how point B should move, so you experiment with different conversion types for point B
  • changing the conversion type for point B breaks the connection you made in the first step
  • converting point B to be a reference, and then experimenting with different conversions in its "Link" parameter allows point A to connect to point B and for the connection to remain in place while you experiment in the "Link" parameter

The resulting value is: 

  Link

Repeat Gradient

Converting a gradient parameter to "Repeat Gradient" adds seven sub-parameters:

  • gradient "Gradient"
  • integer "Count"
  • real "Width"
  • bool "Specify Start"
  • bool "Specify End"
  • color "Start Color"
  • color "End Color"

The resulting value is a gradient containing "Count" equally spaced, equally wide copies of "Gradient". Each copy has "Gradient" going forwards and then backwards. "Width" specifies relative width of the forward copy, with a width of 0 or less meaning only the backward copy is used, and a width of 1 or more meaning only the forward copy is used. A value of 0.5 will result in the forward and reverse copies of "Gradient" being the same width.

If "Specify Start" is checked then "Start Color" will be inserted at the beginning of the new gradient, otherwise the beginning of "Gradient" will be used as the beginning of the new gradient.

If "Specify End" is checked then "End Color" will be appended to the end of the new gradient, otherwise the end of "Gradient" will be used as the end of the new gradient.

Here's an example of a repeated gradient - the radiating green/yellow lines are a repeated gradient, applied to a perpendicular curve gradient. This gradient was repeated with a width of 0.5, meaning it is used backwards and forwards the same amount:

Repeat-gradient-valuenode-gradient.png

and here's the resulting image, along with the .sif file:

Repeat-gradient-valuenode.png 
 You can donwload the project Media:Repeat-gradient-valuenode.sif

Reverse Tangent

Converting a Spline Point parameter to "Reverse Tangent" adds two sub-parameters: one called "Reference" of type Spline Point, and a boolean parameter called "Reverse".

  • Spline Point "Reference"
  • bool "Reverse"

"Reverse Tangent" can only be used on Spline Points.

The resulting value is the same as the "Reference" Spline Point, but with its tangents switched over. This is useful when attempting to link the vertices of a region to the vertices of an outline when the region and the outline were drawn in opposite directions, and so tangent1 of an outline vertex needs to be linked to tangent2 of the region vertex, and vice versa.

Scale

Converting a parameter to "Scale" adds two sub-parameters: one called "Link", of the same type as the parameter itself, and a real-valued parameter called "Scalar".

  • <param> "Link"
  • real "Scalar"

"Scale" can be used on angles, colors, integers, reals, times, and vectors.

The resulting value is: 

  Link * Scalar

Segment Tangent

Converting a vector parameter to "Segment Tangent" adds two sub-parameters:

  • segment "Segment"
  • real "Amount"

"Amount" is a number between 0 and 1, defining the distance along the given "Segment". The resulting value for the whole parameter is the tangent to the segment, at the given point along the segment.

Segment Vertex

Converting a vector parameter to "Segment Vertex" adds two sub-parameters:

  • segment "Segment"
  • real "Amount"

"Amount" is a number between 0 and 1, defining the distance along the given "Segment". The resulting value is the vertex at the given point along the segment.

Sine

Converting a real-valued parameter to "Sine" adds two sub-parameters:

  • angle "Angle"
  • real "Amplitude".

The resulting value is: 

  Amplitude * sin(Angle)

Spline Tangent

Converting a angle, {{l|Convert#Real|real}, or vector parameter to "Spline Tangent" adds six sub-parameters:

  • spline "Spline"
  • bool "Loop"
  • real "Amount"
  • angle "Offset"
  • real "Scale"
  • bool "Fixed Length"

"Amount" is a number between 0 and 1, defining the distance along the given spline. The resulting value for the whole parameter is the tangent to the spline, at the given point along the spline, optionally rotated and scaled according to the "Offset", "Scale", and "Fixed Length" parameters.

"Offset" is an angle used to give the tangent an extra rotation before returning it. If "Fixed Length" is true, the tangent is then scaled to have a length equal to "Scale". Otherwise the tangent is multiplied by "Scale".

If a vector was converted the result is the tangent itself. If an angle was converted, the result is the angle of the tangent to the horizontal, and if a real was converted, the result is the length of the tangent.

This tutorial gives an example of the use of this convert type.

Spline Vertex

Converting a vector parameter to "Spline Vertex" adds three sub-parameters:

  • spline "Spline"
  • bool "Loop"
  • real "Amount"

"Amount" is a number between 0 and 1, defining the distance along the given spline. The resulting value for the whole parameter is a vector giving the position of the given point along the spline.

This tutorial gives an example of the use of this convert type.

Spline Width

Converting a real parameter to "Spline Width" adds three sub-parameters:

  • spline "Spline"
  • bool "Loop"
  • real "Amount"
  • real "Scale"

"Amount" is a number between 0 and 1, defining the distance along the given spline. The resulting value for the whole parameter is the width of the spline at the given point along it, multiplied by the "Scale" parameter.

Step

Converting an angle, color, integer, real, time, or vector parameter to be "Step" adds four sub-parameters:

  • <param> "Link"
  • time "Duration"
  • time "Start Time"
  • real "Intersection"

The parameter's value will change in steps. Each step is "Duration" seconds long. The steps start at times "Start Time", "Start Time"+"Duration", etc. The value of the valuenode is the value of "Link" at some time. "Intersection" determines which time is used. An "Intersection" of 0.0 means that the value of "Link" at the start of the step should be used. An "Intersection" of 0.5 (the default) means to use the value of "Link" at the middle of the step, etc.

The resulting value at time Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://api.formulasearchengine.com/v1/":): {\displaystyle T} is: 

  Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://api.formulasearchengine.com/v1/":): {\displaystyle Link \Bigg ( \Bigg ( Duration \cdot \left ( \left \lfloor \frac{T - Start\ Time}{Duration} \right \rfloor + Intersection \right ) \Bigg ) + Start \ Time \Bigg )}

Example

"Link" is a sine wave. "Duration" is 10f (the frame rate is 24 fps). "Start Time" is 1s.

So one step starts at 1s, and others start at 0s 14f, 0s 4f, 1s 10f, etc.

This is the (kind of) sine wave:

Convert Smooth-sine 0.63.06.png

And this is the effect of the Step valuenode on it, with an "Intersection" of 0.0. Notice that at time 0s, the step has a negative value -- that step runs from -6f to 4f, and so its value is the value of "Link" at time -6f. These images were created in The Gimp - it's not currently possible to view two curves at the same time in Synfig Studio.

Convert Stepped-sine 0.0 0.63.06.png

Here it is with an "Intersection" of 0.5:

Convert Stepped-sine 0.5 0.63.06.png

and here, with an "Intersection" of 1.0:

Convert Stepped-sine 1.0 0.63.06.png 
 You can download the project Media:Doc Convert Step.sifz

Stripes

Converting a gradient parameter to "Stripes" adds four sub-parameters:

  • color "Color 1"
  • color "Color 2"
  • integer "Stripe Count"
  • real "Width"

The resulting value is a gradient containing "Stripe Count" equally spaced, equally wide stripes of color "Color 2" with a background of "Color 1". "Width" specifies the width of the stripes, with a "Width" of 0 or less meaning they are invisible, and a "Width" of 1 or more meaning the whole gradient is of "Color 2".

Subtract

Converting a parameter to "Subtract" adds three sub-parameters, the first two of which are the same type as the parameter itself:

  • <param> "LHS"
  • <param> "RHS"
  • real "Scalar"

The "Subtract" conversion can be used with parameters of type angle, color, gradient, integer, real, time, and vector.

The resulting value is: 

  (LHS - RHS) * Scalar

Switch

Converting a parameter to "Switch" adds three sub-parameters:

  • <param> "Link Off"
  • <param> "Link On"
  • bool "Switch"

"Link Off" and "Link On" are the same type as the parameter being converted.

The resulting value is the value of "Link Off" when "Switch" is off, and "Link On" when "Switch" is on.

This conversion can be used on all value types.

Time Loop

Converting a parameter to "Time Loop" adds four sub-parameters: one called "Link", of the same type as the parameter itself, and three time parameters:

  • <param> "Link"
  • time "Link Time"
  • time "Local Time"
  • time "Duration"

It works similarly to the Time Loop Layer but affects only a single parameter.

For any integer value n, from "Local Time + abs(Duration)*n" to "Local Time + abs(Duration)*(n+1)", the resulting value of the parameter is the same as that of the "Link" parameter from "Link Time" to "Link Time + Duration".

In other words, "Duration" seconds of values of the parameter "Link" starting from time "Link Time" onwards are looped over and over, with the value of the "Link" parameter at time "Link Time" corresponding to the resulting value at time "Local Time".

As an example, suppose the "Link" parameter has a value of time the current time. At 0s the value is 0, at 10s the value is 20.

If we set:

  • Link Time = 5s
  • Local Time = 2s
  • Duration = 4s

then from 2s to 6s and from 6s to 10s, etc., the resulting value is the value of "Link" from 5s to 9s, as follows:

Then the resulting values will be:

  • 0s -> "Link" value at 7s = 14
  • 1s -> "Link" value at 8s = 16
  • 2s -> "Link" value at 5s = 10 (at "Link Time" = 2s, result is the value of "Link" at "Link Time" = 5s = 10)
  • 3s -> "Link" value at 6s = 12
  • 4s -> "Link" value at 7s = 14
  • 5s -> "Link" value at 8s = 16
  • 6s -> "Link" value at 5s = 10 ("Duration" = 4s later, the value is the same as at 2s)
  • 7s -> "Link" value at 6s = 12

If "Duration" is zero, the resulting value is whatever the value of the "Link" parameter is at time "Link Time".

If "Duration" is negative, the resulting value at "Local Time" still matches the value of "Link" at "Link Time", but the animation goes in the opposite direction. For example:

If we set:

  • Link Time = 5s
  • Local Time = 2s
  • Duration = -4s

then from 2s to 6s and from 6s to 10s, etc., the resulting value is the value of "Link" from 5s to 1s, as follows:

Then the resulting values will be:

  • 0s -> "Link" value at 3s = 6
  • 1s -> "Link" value at 2s = 4
  • 2s -> "Link" value at 5s = 10 (at "Link Time" = 2s, result is the value of "Link" at "Link Time" = 5s = 10)
  • 3s -> "Link" value at 4s = 8
  • 4s -> "Link" value at 3s = 6
  • 5s -> "Link" value at 2s = 4
  • 6s -> "Link" value at 5s = 10 (4s later, the value is the same as at "Link Time" = 2s)
  • 7s -> "Link" value at 4s = 8

This conversion can be used on all value types.

Time String

Converting a string parameter to "Time String" adds one sub-parameter called "Time", of type time:

  • time "Time"

The result is a string containing the given "Time".

Timed Swap

This convert type was disabled in Synfig 0.61.06 and earlier because it didn't work.

Converting a parameter to "Timed Swap" adds four sub-parameters:

  • <param> "Before"
  • <param> "After"
  • time "Swap Time"
  • time "Swap Duration"

"Before" and "After" are the same type as the parameter being converted.

This conversion type linearly switches from "Before" to "After", taking "Swap Duration" seconds to do so, and completing the swap at "Swap Time".

Note that this doesn't give us anything that we can't achieve using the "Linear" conversion type and a few waypoints.

"Timed Swap" can be used on angles, colors, integers, reals, times, and vectors.

The resulting value is: 

  if time > "Swap Time" then "After"
  else if time < ("Swap Time" - "Swap Duration") then "Before"
  else interpolate between "Before" and "After"

Two-Tone

Converting a gradient to "Two-Tone" adds two color-valued sub-parameters:

  • color "Color1"
  • color "Color2"

The resulting gradient has two Color Stop, one at each end, starting with "Color1" and ending with "Color2".

These color parameters can be animated, giving us the ability to have the gradient change color over time. It used to be used as a workaround for this bug.

Vector Angle

Converting an angle to "Vector Angle" adds a vector sub-parameter:

  • vector "Vector"

The resulting value is the angle between the "Vector" and the X axis.

Vector Length

Converting a real to "Vector Length" adds a vector sub-parameter:

  • vector "Vector"

The resulting value is the length of the "Vector".

Vector X

Converting a real to "Vector X" adds a vector sub-parameter:

  • vector "Vector"

The resulting value is the X component of the "Vector".

Vector Y

Converting a real to "Vector Y" adds a vector sub-parameter:

  • vector "Vector"

The resulting value is the Y component of the "Vector".

Which Value Types can use which Convert Types?

There are 13 different types of value in Synfig. Each of these types has a different set of convert types available to it, as follows:

Type angle icon.png Angle

Angle parameters can be converted to Add, aTan2, Spline Tangent, Dot Product, Linear, Random, Range, Scale, Step, Subtract, Switch, Time Loop, Timed Swap, Vector Angle, and Reference types.

Type bool icon.png Bool

Bool parameters can only be converted to the And, Greyed, Or, Not, Compare Random, Switch, Time Loop,and Reference types.

Type canvas icon 0.63.06.png Canvas

Canvas parameters can be converted to the Switch, Time Loop, and Reference type.

Type color icon.png Color

Color parameters can be converted to Add, Composite, Gradient Color, Linear, Radial Composite, Random, Scale, Step, Subtract, Switch, Time Loop, Timed Swap, and Reference types.

Type gradient icon.png Gradient

Gradient parameters can be converted to Add, Gradient Rotate, Repeat Gradient, Stripes, Subtract, Switch, Time Loop, Two-Tone, and Reference types.

Type integer icon.png Integer

Integer parameters can be converted to Add, Linear, Random, Range, Scale, Step, Subtract, Switch, Time Loop, Timed Swap, and Reference types.

Type list icon.png List

List parameters can be converted to Spline, Dynamic List, Switch, Time Loop, and Reference types.

Type real icon.png Real

Real parameters can be converted to Add, Spline Width, Cos, Dot Product, Exponential, Linear, Logarithm, Power, Random, Range, Reciprocal, Scale, Sine, Step, Subtract, Switch, Time Loop, Timed Swap, Vector Length, Vector X, Vector Y, and Reference types.

Type segment icon.png Segment

Segment parameters can be converted to the Composite, Switch, Time Loop, and Reference types.

Type blinepoint icon.png Spline Point

Spline Point parameters can be converted to Composite, Reverse Tangent, Switch, Time Loop, and Reference types.


Type string icon.png String

String parameters can be converted to the Angle String, Int String, Joined List, Real String, Switch, Time Loop, Time String, and Reference types.

Type time icon.png Time

Time parameters can be converted to the Add, Linear, Random, Range, Scale, Step, Subtract, Switch, Time Loop, Timed Swap, and Reference types.

Type vector icon.png Vector

Vector parameters can be converted to Add, Spline Tangent, Spline Vertex, Composite, Linear, Radial Composite, Random, Scale, Segment Tangent, Segment Vertex, Step, Subtract, Switch, Time Loop, Timed Swap, and Reference types.

Compatibility

When a new ValueNode type is added to Synfig, the .sif file format is extended to include a way of writing the new type. This extension won't be able to be read by any older version of Synfig. Here's a list of the ValueNode types that have been added, along with the subversion revision number in which they first appeared:

Version Revision Convert
(0.65.0) not yet released  
  pull#105 Dynamic
(0.63.06)  
   ? BLine Width renamed Spline Width
   ? BLine Vertex renamed Spline Vertex
   ? BLine Tangent renamed Spline Tangent
(0.61.09)  
  2034 Logarithm
  2010 Int String
  2010 Angle String
  2007 Joined List
  2003 Real String
  2000 Time String
  1891 Dot Product
  1885 Gradient Color
  1882 Vector X
  1882 Vector Y
  1881 Vector Length
  1880 Vector Angle
(0.61.08) 1839  
  1694 BLine Width
  1690 Random (for bools)
  1691 Step
  1354 Subtract (for gradients)
  1354 Add (for gradients)
  1267 From Integer
  1267 Duplicate
  1238 Reciprocal
  1226 Time Loop
  1162 Reverse Tangent
  1132 aTan2
  1111 Cos
  923 Switch
  907 Random
(0.61.07) 878  
  776 Range
  744 Spline Vertex
  744 Spline Tangent
  742 Add
  739 Exponential
  666 Repeat Gradient
  610 Timed Swap
(0.61.06) 536  


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