sceneview/io.github.sceneview.gesture/RotateGestureDetector

RotateGestureDetector

open class RotateGestureDetector(context: Context, listener: RotateGestureDetector.OnRotateListener)

Detects rotation transformation gestures using the supplied MotionEvents.

The OnRotateListener callback will notify users when a particular gesture event has occurred.

This class should only be used with MotionEvents reported via touch.

To use this class:

Create an instance of the RotateGestureDetector for your android.view.View.
In the android.view.View.onTouchEvent method ensure you call onTouchEvent. The methods defined in your callback will be executed when the events occur.

Parameters

context

the application's context

listener

the listener invoked for all the callbacks, this must not be null

Constructors

RotateGestureDetector

constructor(context: Context, listener: RotateGestureDetector.OnRotateListener)

Types

OnRotateListener

interface OnRotateListener

The listener for receiving notifications when gestures occur.

SimpleOnRotateListener

interface SimpleOnRotateListener : RotateGestureDetector.OnRotateListener

A convenience class to extend when you only want to listen for a subset of rotation-related events.

Properties

currentAngle

var currentAngle: Float

The average angle in radians between each of the pointers forming the gesture in progress through the focal point.

currentSpan

var currentSpan: Float

The current distance in pixels between the two pointers forming the gesture in progress.

focusX

var focusX: Float

The X coordinate of the current gesture's focal point in pixels.

focusY

var focusY: Float

The Y coordinate of the current gesture's focal point in pixels.

isGestureInProgress

var isGestureInProgress: Boolean

true if a rotate gesture is in progress.

lastAngle

var lastAngle: Float

previousAngle

var previousAngle: Float

The previous average angle in radians between each of the pointers forming the gesture in progress through the focal point.

previousSpan

var previousSpan: Float

The previous distance in pixels between the two pointers forming the gesture in progress.

rotation

var rotation: Float

The rotation factor in degrees from the previous rotation event to the current event.

rotationThreshold

var rotationThreshold: Float

The initial rotation threshold in degrees for detecting a gesture.

timeDelta

var timeDelta: Long

The time difference in milliseconds between the previous accepted GestureDetector event and the current GestureDetector event

Functions

onTouchEvent

fun onTouchEvent(event: MotionEvent): Boolean

Accepts MotionEvents and dispatches events to a OnRotateListener when appropriate.

reset

fun reset()