MutableStrokeInputBatch

Kotlin |Java

class MutableStrokeInputBatch : StrokeInputBatch

kotlin.Any
↳	androidx.ink.strokes.StrokeInputBatch
	↳	androidx.ink.strokes.MutableStrokeInputBatch

A mutable implementation of StrokeInputBatch. For an immutable alternative, see ImmutableStrokeInputBatch.

Each appended StrokeInput value is validated compared to the existing batch contents. This means:

All floating point values are required to be finite and the format of all inputs must be consistent. This means all inputs must have the same set of optional member variables that hold a value. For example, every input holds a pressure value if-and-only-if every other input holds a pressure value. This is also true for tiltRadians and orientationRadians.
The sequence of StrokeInput values must not contain repeated x-y-t triplets, and the time values must be non-negative and non-decreasing.
Values of strokeUnitLengthCm must be finite and positive, or be StrokeInput.NO_STROKE_UNIT_LENGTH.
Values of StrokeInput.pressure must fall within the range of 0, 1 or be StrokeInput.NO_PRESSURE
Values of StrokeInput.tiltRadians must fall within the range of 0, π/2 or be StrokeInput.NO_TILT.
Values of StrokeInput.orientationRadians must fall within the range of [0, 2π) or be StrokeInput.NO_ORIENTATION.
The toolType and strokeUnitLengthCm values must be the same across all inputs.

Summary

Public constructors
`MutableStrokeInputBatch()`

Public functions
`MutableStrokeInputBatch`	`add(inputBatch: StrokeInputBatch)` Validates and appends an `inputBatch`.
`MutableStrokeInputBatch`	`add(input: StrokeInput)` Adds an `input` to the batch if valid.
`MutableStrokeInputBatch`	`add(inputs: Collection<StrokeInput>)` Validates and appends a collection of `StrokeInput`.
`MutableStrokeInputBatch`	`add( type: InputToolType, x: Float, y: Float, elapsedTimeMillis: Long, strokeUnitLengthCm: Float, pressure: Float, tiltRadians: Float, orientationRadians: Float )` Variant of `add` that takes individual parameters instead of a `StrokeInput`.
`Unit`	`clear()`
`Unit`	`@ExperimentalInkCustomBrushApi setNoiseSeed(seed: Int)` Sets the per-stroke seed value that should be used when regenerating a stroke from this input batch.
`open String`	`toString()`

Inherited functions

From androidx.ink.strokes.StrokeInputBatch

`Unit`	`finalize()`
`operator StrokeInput`	`get(index: Int)` Gets the value of the i-th input.
`Long`	`getDurationMillis()` The duration between the first and last input in milliseconds.
`Int`	`@ExperimentalInkCustomBrushApi getNoiseSeed()` Returns the seed value that should be used for seeding any noise generators for brush behaviors when a full stroke is regenerated with this input batch.
`Float`	`getStrokeUnitLengthCm()` The physical distance in centimeters that the pointer must travel in order to produce an input motion of one stroke unit.
`InputToolType`	`getToolType()` How this input stream should be interpreted, as coming from a `InputToolType.MOUSE`, `InputToolType.TOUCH`, or `InputToolType.STYLUS`.
`Boolean`	`hasOrientation()` Whether all of the individual inputs have a defined value for `StrokeInput.orientationRadians`.
`Boolean`	`hasPressure()` Whether all of the individual inputs have a defined value for `StrokeInput.pressure`.
`Boolean`	`hasStrokeUnitLength()` Whether strokeUnitLengthCm has a valid value, which is something other than `StrokeInput.NO_STROKE_UNIT_LENGTH`.
`Boolean`	`hasTilt()` Whether all of the individual inputs have a defined value for `StrokeInput.tiltRadians`.
`Boolean`	`isEmpty()` `true` if there are no `StrokeInput` objects in the batch, and `false` otherwise.
`StrokeInput`	`populate(index: Int, outStrokeInput: StrokeInput)` Gets the value of the i-th input and overwrites `outStrokeInput`, which it then returns.

Inherited properties

From androidx.ink.strokes.StrokeInputBatch

Int

size

Number of StrokeInput objects in the batch.

Public constructors

MutableStrokeInputBatch

Added in 1.0.0-beta02

MutableStrokeInputBatch()

Public functions

add

Added in 1.0.0-beta02

fun add(inputBatch: StrokeInputBatch): MutableStrokeInputBatch

Validates and appends an inputBatch. Invalid inputBatch will result in no change. An exception will be thrown for invalid additions.

add

Added in 1.0.0-beta02

fun add(input: StrokeInput): MutableStrokeInputBatch

Adds an input to the batch if valid.

Inputs are invalid if they contain values out of the valid range, duplicate a previous input, have an elapsed time before a previous input, or have a different tool type or set different optional fields (pressure, tilt, or orientation) than the inputs already in the batch.

Returns this instance to allow call chaining.

Parameters
`input: StrokeInput`	The `StrokeInput` to add to the batch.

Returns
`MutableStrokeInputBatch`	`this`

Throws
`kotlin.IllegalArgumentException`	If the input is not valid. Note that this can be a common occurrence with real user input on certain devices, in particular due to duplicate or out-of-order inputs. Therefore, users should either catch and handle this exception or sanitize the input to avoid ensure validity before passing it to this function.

add

Added in 1.0.0-beta02

fun add(inputs: Collection<StrokeInput>): MutableStrokeInputBatch

Validates and appends a collection of StrokeInput. Invalid inputs will result in no change. An exception will be thrown for invalid additions.

Returns this instance to allow call chaining.

Parameters
`inputs: Collection<StrokeInput>`	`Collection` of `StrokeInput`s to add to the batch.

Returns
`MutableStrokeInputBatch`	`this`

Throws
`kotlin.IllegalArgumentException`	If the input is not valid. Note that this can be a common occurrence with real user input on certain devices, in particular due to duplicate or out-of-order inputs. Therefore, users should either catch and handle this exception or sanitize the input to avoid ensure validity before passing it to this function.

add

Added in 1.0.0-beta02

fun add(
    type: InputToolType,
    x: Float,
    y: Float,
    elapsedTimeMillis: Long,
    strokeUnitLengthCm: Float = StrokeInput.NO_STROKE_UNIT_LENGTH,
    pressure: Float = StrokeInput.NO_PRESSURE,
    tiltRadians: Float = StrokeInput.NO_TILT,
    orientationRadians: Float = StrokeInput.NO_ORIENTATION
): MutableStrokeInputBatch

Variant of add that takes individual parameters instead of a StrokeInput.

Returns this instance to allow call chaining.

Parameters
`type: InputToolType`	The `InputToolType` to use for the input.
`x: Float`	The x-coordinate of the input position in stroke space.
`y: Float`	The y-coordinate of the input position in stroke space.
`elapsedTimeMillis: Long`	Marks the number of milliseconds since the stroke started. It is a non-negative timestamp in the `android.os.SystemClock.elapsedRealtime` time base.
`strokeUnitLengthCm: Float = StrokeInput.NO_STROKE_UNIT_LENGTH`	The physical distance in centimeters that the pointer must travel in order to produce an input motion of one stroke unit. For stylus/touch, this is the real-world distance that the stylus/fingertip must move in physical space; for mouse, this is the visual distance that the mouse pointer must travel along the surface of the display. A value of `StrokeInput.NO_STROKE_UNIT_LENGTH` indicates that the relationship between stroke space and physical space is unknown or ill-defined.
`pressure: Float = StrokeInput.NO_PRESSURE`	Should be within 0, 1 but it's not enforced until added to a `StrokeInputBatch` object. Absence of `pressure` data is represented with `StrokeInput.NO_PRESSURE`.
`tiltRadians: Float = StrokeInput.NO_TILT`	The angle in radians between a stylus and the line perpendicular to the plane of the screen. 0 is perpendicular to the screen and PI/2 is flat against the drawing surface. Absence of `tiltRadians` data is represented with `StrokeInput.NO_TILT`.
`orientationRadians: Float = StrokeInput.NO_ORIENTATION`	Indicates the direction in which the stylus is pointing in relation to the positive x axis in radians. A value of 0 means the ray from the stylus tip to the end is along positive x and values increase towards the positive y-axis. Absence of `orientationRadians` data is represented with `StrokeInput.NO_ORIENTATION`.

Returns
`MutableStrokeInputBatch`	`this`

Throws
`kotlin.IllegalArgumentException`	If the input is not valid. Note that this can be a common occurrence with real user input on certain devices, in particular due to duplicate or out-of-order inputs. Therefore, users should either catch and handle this exception or sanitize the input to avoid ensure validity before passing it to this function.

clear

Added in 1.0.0-beta02

fun clear(): Unit

setNoiseSeed

Added in 1.0.0-beta02

@ExperimentalInkCustomBrushApi
fun setNoiseSeed(seed: Int): Unit

Sets the per-stroke seed value that should be used when regenerating a stroke from this input batch.

toString

open fun toString(): String