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Reference

Note, that you need to import this library to any context expect Global

Needs["AnimationFramework`"->"af`"];

Scene​

af`Scene[opts___] _Scene

constructs the main object Scene, where animation is going to be rendered. It also serves the purpose of a hosting object for primitives, animations, workers and etc.

The local coordinates are limited to ±1\pm 1 for the square aspect ratio, otherwise the smallest side takes is scaled to 1:

Scenes can be reused multiple times in different animations.

Options​

ImageSize​

By the default is Medium. Not that unlike in Graphics here the size is pixel perfect.

"TimeMarkers"​

Sets the time markers from the Timeline

"GlobalDirectives"​

Adds a provided list to the scene globally (set font size globally and etc)

Other options​

The rest is inherited from Graphics. PlotRange, ImageSizeRaw, cannot be changed.

Animation Flow​

All animations on the scene should follows the pattern:

  • append objects
  • animate
  • remove objects

By design most of methods and functions of AF framework return Promise expression. In this regard, it makes sense to describe your animation flow using Asynchronous Functions:

AsyncFunction[scene, Module[{},
	...
]][scene];

Supported methods​

AddTo​

The most important method for the animation scene or to a layer:

immutable object
af`AddTo[_Scene | layer_, primitives_] _af`Private`entity
object with mutable properties
af`AddTo[_Scene | layer_, primitives_, {
	prop1_String -> value1_,
	...
}] _af`Private`entity

where primitives can be any 2D graphics object, or an expression, that produces graphics objects or your custom written WLJS Function that support .update method.

note

AddTo function works for both: Scene and Layer objects

Mutable properties are embed using Slot expression aka

Primitive[#prop1, #prop2] ...

Basic example:

disk = af`AddTo[scene, {Red, Disk[{0,0}, 1]}];

However, it does not have any mutable properties. Here is another example

disk = af`AddTo[scene, {Red, Disk[#pos, #r]}, {
	"pos" -> {0.,0.},
	"r" -> 0.5
}];

On the created entity the following methods are supported

Supported methods​

Update​

Assigns a new value to a given property or list of properties

assign 1 value
af`Update[scene_Scene, entity_, prop_String -> newValue_ ..]
assign set of values
af`Update[scene_Scene, entity_, {
	prop1_String -> val1_,
	...
}]
af`Update[entity_, {__Rule}]

The action will be applied immediately without easing. For example:

disk = af`AddTo[scene, {Red, Disk[#pos, #r]}, {
	"pos" -> {0.,0.},
	"r" -> 0.5
}];
af`Update[scene, disk, "pos"->RandomReal[{-1,1}, 2]];

Remove​

Removes a single object or object from the scene or in a layer (including all children)

remove a single object
af`Remove[_af`Private`entity | _af`Private`runner | _af`Private`worker]
remove a layer with children
af`Remove[layer_af`Private`entity]
remove all obejcts in the scene
af`Remove[_Scene]
note

Remove acting on Scene does not remove the scene itself, but it disposes all objects added to it including the nested ones (layers). Use it as a fast way to clean up the scene.

Animate​

It animates the transition of a property or set of properties with a given easing function on the scene

af`Animate[scene_Scene, entity_, prop_String -> value_, easing_:"CubicInOut", duration_:1] _Promise
af`Animate[scene_Scene, entity_, {
	prop1_String -> value1_,
	prop2_String -> value2_, ...
}, easing_:"CubicInOut", duration_:1] _Promise

where easing is function used for animating the transition:

  • "Linear"
  • "CubicInOut" or "Ease"
  • "QuadIn"
  • "QuadOut"
  • "LinearEuclidean" (usually used for colors)
  • Function[{t, initial, current, target}, ...]

and duration is given in seconds.

In addition Animate can be applied to any held _Symbol:

af`Animate[scene_Scene, Hold[symbol_], newValue_, easing_:"CubicInOut", duration_:1] _Promise

or a Layer entity

af`Animate[scene_Scene, layer_, prop_String->newValue_, easing_:"CubicInOut", duration_:1] _Promise

Animate always returns Promise, which is resolved when the animation is finished, i.e.:

wait for the animation to be finished

af`Animate[scene, object, "prop"->1.0] // Await;

wait for multiple animations to be finished

{
	af`Animate[scene, object1, "prop"->1.0],
	af`Animate[scene, object2, "prop"->1.0],
}// Await;
tip

For animating multiple properties of the same object - use

af`Animate[scene, object1, {"prop1"->1.0, "prop2"->3.0}]

Animation is done fully using Wolfram Kernel (no Javascript easing is involved) at the maximum available frame rate (dynamic).

For example:

scene = af`Scene[];
scene
AsyncFunction[scene, Module[{d},
  d = af`AddTo[scene, {
    Opacity[#o], 
    Translate[
      Rotate[
        Rectangle[{-0.5,-0.1}, {0.5,0.1}]
      , #r]
    , #c]
  }, {
    "o" -> 0.,
    "r" -> 0.,
    "c" -> {0,0}
  }];

  af`Animate[scene, d, {"o" -> 1.0,"r" -> 3.14}, "Ease", 1.0] // Await;

  PauseAsync[1] // Await;
  
  af`Animate[scene, d, {"o"->0., "r"->0}, "Ease", 1.0] // Await;

  af`Remove[d];
]][scene];

Supported property types​

  • Real, Integer
  • List of integers, reals
  • List of List and etc
  • String with numbers inside

In principle anything, which can be combined with multiplication and sum can work as a property value.

Strings​

String interpolation is done in steps:

  • exploding string into string and number-like string
  • convert number-like strings into array
  • interpolate a array (using easing function) between the original and target value (transformed from a string)
  • compose back into a string

For example, one can easily animate the following SVG attribute

scene = af`Scene[];
scene
AsyncFunction[scene, Module[{layer},
  
  layer = af`Layer[scene, {
	SVGAttribute[#children, "style"->#style]
  }, {"style" -> "filter: blur(0px)"}];

  af`AddTo[layer, Table[{RandomColor[], Disk[RandomReal[{-1,1},2], 1.0]}, {10}]];
  af`Animate[scene, layer, "style"->"filter: blur(100px)", "Ease", 5]//Await;

  af`Remove[layer];

]][scene];

Layer​

It creates an isolated group of objects (layer):

no mutable props
af`Layer[scene_Scene | layer_, body_] _af`Private`entity
mutable props
af`Layer[scene_Scene | layer_, body_, {
	prop1_String -> value1_,
	...
}] _af`Private`entity

where body is defined similar to one in AddTo:

{
	Opacity[0.5],
	#children
}

or

{
	Opacity[#opacity],
	Translate[#children, #coordinates]
}

where #children is a special reserved slot to specify where to append children. You can append objects similar to Scene using AddTo expression:

layer = af`Layer[scene, {
	Opacity[#opacity],
	Translate[#children, #coordinates]
}, {"opacity" -> 0.5, "coordinates"->{0,0}}];

af`AddTo[layer, Table[{RandomColor[], Disk[RandomReal[{-0.2,0.2},2], 0.05]}, {10}]];

Z-ordering​

To preserve z-order of your primitives, one can use Layer together with SVGGroup.

Supported methods​

Loop​

It create custom animation loop, which is repeated until manually removed

af`Loop[scene_Scene, entity_, property_String, function_, duration_:1] _af`Private`runner

where function should have the following form:

Function[{t, prevValue, cycleNumber},
	
]

Here t goes from 0 to 1 in duration seconds, and cycleNumber represents the number of rounds passed.

note

function is fired every frame

How to stop a loop​

Before removing a loop animation call Await Finish on the loop object to wait until the cycle is fully finished. Finish returns promise, which is resolved on the end of the current cycle. This will help to avoid abrupt stop of the loop. For example

scene = af`Scene[];
scene

stop = InputButton["Stop"]
AsyncFunction[scene, Module[{d, loop},
  d = af`AddTo[scene, {
    Rotate[
      Rectangle[{-0.5,-0.1}, {0.5,0.1}]
    , #r]
  }, {
    "r" -> 0.
  }];

  loop = af`Loop[scene, d, "r", Function[{t, o, n},
    3.14 t + (n-1) 3.14
  ], 2];

  stop // Await;

  af`Finish[loop] // Await;
  
  af`Remove[loop];

  PauseAsync[0.5] // Await;

  af`Remove[d];
]][scene]

Supported methods​

Worker​

Workers are similar to Loops, but allow to execute an arbitrary code concurrently with the main animation on each frame:

af`Worker[scene_Scene, function_] _af`Private`worker

where function has the following form

Function[absoluteTime, ...]

You can place an entire new animation sequence to a worker as Asynchronous Functions:

AsyncFunction[absoluteTime, ...]

function is called every frame, but only after the execution of the previous function call is finished. absoluteTime is a time in seconds passed after the worker has been created.

For example:

scene = af`Scene[];
scene
stop = InputButton["Stop"]
AsyncFunction[scene, Module[{d, worker},
  d = af`AddTo[scene, {
    Rotate[
      Rectangle[{-0.5,-0.1}, {0.5,0.1}]
    , #r]
  }, {
    "r" -> 0.
  }];

  worker = af`Worker[scene, AsyncFunction[Null,
    af`Animate[scene, d, "r"->Pi/2] // Await;
    af`Animate[scene, d, "r"->-Pi/2] // Await;
  ]];

  stop // Await;

  af`Finish[worker] // Await;
  af`Remove[worker];

  PauseAsync[0.5] // Await;

  af`Remove[d];
]][scene]

How to stop a worker​

Before removing a worker call Await Finish on the worker object to wait until the execution is fully finished (as on the example above). Finish returns promise, which is resolved on the end of the current cycle. This will help to avoid abrupt stop.

Supported methods​

Component​

Adds to a scene or layer an object similar to AddTo with custom update and remove functions

af`Component[s_Scene | layer_, 
{
	"Update" -> update_Function,
	"Remove" -> remove_Function
},
{
	prop1_String -> value1_,
	...
}] _af`Private`entity

where remove and update are called with an association argument, containing all defined properties.

Supported methods​

CameraRig​

It is a special object allowing to animate and set camera zoom and pan:

af`CameraRig[scene_Scene] _af`Private`entity

it returns a similar object to AddTo, which is removable, animatable and etc - see below.

Properties​

There are two hidden properties:

  • "zoom" by the default is 1.0
  • "position" by the default is {0,0}

Supported methods​

Finish​

af`Finish[worker_ | loop_ | _Promise] _Promise

It is a special promise generator used for waiting for various events:

  • Loop has finished the cycle of animation
  • Worker has finished the function execution

Any Promise object will be returned without changes. It only makes sense to use it with Await expression:

af`Finish[worker1] // Await

or multiple events

{
	af`Finish[worker1],
	af`Finish[worker2]
} // Await

RecordAnimation​

info

Read more at Recording page

To render the animation into the sequence of images:

af`RecordAnimation[animationFunction_, opts___] _af`Private`recorder

where animationFunction is your async animation function, that accepts Scene object and opts are the same as for Scene including extra:

  • FrameRate - frames per second (60 by the default)
  • GeneratedAssetLocation - by the default is $TemporalDirectory
  • GeneratedAssetFormat - format for rendered sequence: "PNG", "JPEG"
  • CompressionLevel - by the default is 0.2 (applicable only for JPEG)
  • "TimeMarkers" - sets the time markers from the Timeline
  • "StaggerDelay" - sets an extra delay in milliseconds before capturing a frame (by the default is set to 30)

Properties​

recorder object provides the following fields:

  • "GeneratedAssetLocation" - path to sequence
  • "Recording" - status

TimelinedAnimation​

info

Read more at Timeline page

To play an animation with a graphical timeline attached:

af`RecordAnimation[animationFunction_, opts___] _af`Private`timelined

where animationFunction is your async animation function, that accepts Scene object and opts are the same as for Scene including extra:

  • "TimeMarkers" - sets the time markers from the Timeline
  • "AudioClips" - restores recorded voice overs

Note, RecordAnimation has HoldFirst attribute.

Properties​

timelined object provides the following fields:

  • "TimeMarkers" - current time markers
  • "AudioClips" - gets audio clips from the timeline
  • "AudioClipsAsync" - gets audio clips from the timeline

Utilities​

Color​

af`Color[_Hue | _RGBColor | _LABColor] _List

a color conversion tool, which turns any color representation to a list of RGB values. This comes handy with RGBColor, since to update it you need to provide a list instead of an actual color:

{RGBColor[#color], ...}

then when you update

af`Animate[... "color"->af`Color[Red], ...]

PauseAsync​

A modified version of system default PauseAsync with extra argument

PauseAsync[scene_Scene, n_Integer | n_Real] _Promise

Here the time delay will be in sync with Scene. It makes sense during the Recording process, where the actual time is fixed with a frame rate.

Delayed​

Pattern 1​

A generator of delay wrappers

af`Delayed[scene_Scene, duration_] _Function

The returned function can be applied to any other expression to delay its execution (including Asynchronous Functions). Returns Promise.

For example:

g = af`Delayed[scene, 1];
g[af`Animate[scene, object, "prop"->1.0, "Linear", 1.0]] // Await;

Pattern 2​

Using 3 arguments:

af`Delayed[function_, scene_Scene, duration_] _Promise

RecorderToVideo​

It converts recorder object to Video after the rendering is finished

af`RecorderToVideo[_af`Private`recorder] _Video

Marker​

A helper to wait or extract property from Timeline markers

wait for the marker

af`Marker[scene_Scene, name_String] _Promise
af`Marker[scene_Scene, name_String, "Start"] _Promise

wait for the end of the marker

af`Marker[scene_Scene, name_String, "End"] _Promise

take duration in seconds

af`Marker[scene_Scene, name_String, "Duration"] _Real

AudioFromClips​

A helper function to convert a list of audio clips (voice overs) retrieved from the properties of timelined object to a single audio object:

af`AudioFromClips[clips_List]

For example:

af`AudioFromClips[t["AudioClips"]]

where t is your TimelinedAnimation object

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