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The Animation and Transformation Language ATL provides a high-level way of choosing a displayable to show, positioning it on the screen, and applying transformations such as rotation, zoom, and alpha-modification. These can be changed over time, and in response to events. There is no way to create an ATL transform programmatically. The transform statement creates a transform that can be supplied as part of an at clause. The syntax of the transform statement is:. The transform statement must be run at init time.
If it is found outside an init block, then it is automatically placed inside an init block with a priority of 0. The transform may have a list of parameters, which renpy parallel be supplied when it is called. Name must be a Python identifier. The transform created by the ATL block is bound to this name. This binds an image name to the given transform. As there's no way to supply parameters to this transform, it's only useful if the transform defines an animation.
The syntax for an image statement with ATL block is:. The final way to use ATL is as part of a scene or show statement. This wraps the image being shown inside an ATL transformation. An ATL block consists of one or more logical lines, all at the same indentation, and indented relative to the statement containing the block. There are two kinds of ATL statements: simple and complex. Simple statements do not take an ATL block.
A single logical line may contain one or more ATL statements, separated by commas. A complex statement contains a block, must renpy parallel on its own line.
The first line of a complex statement always ends with a colon :. By default, statements in a block are executed in the order in which they appear, starting with the first statement in the block. Execution terminates when the end of the block is reached. Time statements change this, as described in the appropriate section below. If an ATL statement requires evaluation of an expression, such evaluation occurs when the transform is first added to the scene list. Such as when using a show statement or ui function.
The first part of the interpolation statement is used to select a function that time-warps the interpolation. That is, a function from linear time to non-linear time. This can either be done by giving the name of a warper registered with ATL, or by giving the keyword "warp" renpy parallel by an expression giving a function.
Either case is followed by agiving the of seconds the interpolation should take. If no warp function is given, the interpolation is instantaneous. Otherwise, it persists for the amount of time given, and at least one frame. The warper and duration are used to compute a completion fraction. This is done by dividing the time taken by the interpolation by the duration of the interpolation.
This is clamped to the duration, and then passed to the warper.
The result returned by the warper is the completion fraction. The interpolation statement can then contain a of other clauses. When a property and value are present, then the value is the value the property will obtain at the end of the statement.
The value can be obtained in several ways:. If a simple expression is present, it should evaluate to a transform with only a single interpolation statement, without a warper, splines, or circular motion. The properties from the transform are processed as if they were included in this statement. An important special case is that the pause warper, followed by a time and nothing else, causes ATL execution to pause for that amount of time. Some properties can have values of multiple types. For example, the xpos property can be an int, float, or absolute. The behavior is undefined when an interpolation has old and new property values of different types.
The time statement is a simple control statement. When the time given in the statement is reached, the following statement begins to execute. This transfer of control occurs even if a statement is still executing, and causes any prior statement to immediately terminate. Time statements are implicitly preceded by a pause statement with an infinite time. This means that if control would otherwise reach the time statement, it waits until the time statement would take control.
An expression statement is a simple statement that starts with a simple expression. It then contains an optional with clause, with a second simple expression. The pass statement is a simple statement that causes nothing to happen. This can be renpy parallel when there's a desire to separate statements, like when there are two sets of choice statements that would otherwise renpy parallel back-to-back.
The repeat statement is a simple statement that causes the block containing it to execution from the beginning. If renpy parallel expression is present, then it is evaluated to give an integer of times the block will execute.
So a block ending with repeat 2 will execute at most twice. Renpy parallel block statement is a complex statement that contains a block of ATL statements. This can be used to group statements that will repeat.
The choice statement is a complex statement that defines one of a set of potential choices. Ren'Py will pick one of the choices in the set, and execute the ATL block associated with it, and then continue execution after the last choice in the choice set. Choice statements are greedily grouped into a choice set when more than one choice statement appears consecutively in a block.
The parallel statement is used to define a set of ATL blocks to execute in parallel. Parallel statements are greedily grouped into a parallel set when more than one parallel statement appears consecutively in a block. The blocks of all parallel statements are then executed simultaneously. The parallel statement terminates when the last block terminates. The blocks within a set should be independent of each other, and manipulate different properties. When two blocks change the same property, the result is undefined. The event statement is a simple statement that causes an event with the given name to be produced.
When an event is produced inside a block, the block is checked to see if an event handler for the given name exists. If it does, control is transferred to the event handler. Otherwise, the event propagates to any containing event handler. The on statement is a complex statement that defines an event handler. On statements are greedily grouped into a single statement. On statement can handle a single event name, or a comma-separated list of event names.
Renpy parallel on statement is used to handle events. When an event is handled, handling of any other event ends and handing of the new event immediately starts. When an event handler ends without another event occurring, the default event is produced unless were already handing the default event. Execution of the on statement will never naturally end.
But it can be ended by the time statement, or an enclosing event handler. The contains statement sets the displayable contained by this ATL transform the child of the transform. There are two variants of the contains statement. The contains expression variant takes an expression, and sets that expression as the child of the transform. One or more contains block statements will be greedily grouped together, wrapped inside a Fixedand set as the child of this transform. Each block should define a displayable to use, or else an error will occur. The contains statement executes instantaneously, without waiting for the children to complete.
This statement is mostly syntactic sugar, as it allows arguments to be easily passed to the children. The functions have the same ature as those used with Transform :. This function should not have side effects other than changing the Transform object in the first argument, and may be called at any time with any value to enable prediction. A warper is a function that can change the amount of time an interpolation statement considers to have elapsed.
The following warpers are defined by default. They are defined as functions from t to t', where t and t' are floating point s, with t ranging from 0. If the statement has 0 duration, then t is 1. In addition, most of Robert Penner's easing functions are supported. To make the names match those above, the functions have been renamed somewhat. New warpers can be defined using the renpy. It should be placed in a file that is parsed before any file that uses the warper. This looks like:. When the type is given as position, it may be an int, an absoluteor a float.
If it's a float, it's interpreted as a fraction of the size of the containing area for pos or displayable for anchor. Note that not all properties are independent. For example, xalign and xpos both update some of the same underlying data. In a parallel statement, only one block should adjust horizontal position, and one should adjust vertical positions.
These may be the same block. The angle and renpy parallel properties set both horizontal and vertical positions. The of pixels the displayable is offset by in the horizontal direction. Positive values offset toward the right.
The of pixels the displayable is offset by in the vertical direction. Positive values offset toward the bottom. If None, no rotation occurs. Otherwise, the image will be rotated by this many degrees clockwise. This can cause positioning to change if xanchor and yanchor are not 0. If True, then a rotated displayable is padded such that the width and height are equal to the hypotenuse of the original width and height. This ensures that the transform will not change size as its contents rotate.
Renpy parallel False, the transform will be given the minimal size that contains the transformed displayable. This is more suited to fixed rotations. If true, the anchor point is located on the cropped child, and is scaled and rotated as the child is transformed. Effectively, this makes the anchor the point that the child is rotated and scaled around.Renpy parallel
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Have two transitions/transforms? At the same time