cugl::CoreGestureEvent Class Reference

#include <CUCoreGesture.h>

Public Member Functions
	CoreGestureEvent ()
	CoreGestureEvent (const Timestamp &start)
	CoreGestureEvent (const CoreGestureEvent &event)
void	clear ()

Public Attributes
Timestamp	start
Timestamp	now
CoreGestureType	type
Vec2	origPosition
Vec2	currPosition
float	origSpread
float	currSpread
float	origAngle
float	currAngle

Detailed Description

This simple class is a struct to hold a core gesture event.

A core gesture is a gesture with duration. Hence this event stores information about the start of the event, as well as the current status of the event.

A core gesture contains three bits of information: the position of the fingers (computed as the average), the distance spread between the fingers, and the current angle of the line between the two fingers. All three values are continually updated regardless of the gesture type.

The gesture type is initially CoreGestureType::NONE, but transitions to one of the other types when a threshold is passed. The threshold limits are defined in CoreGesture.

The value of pan and pinch events is typically measured in pixels, as it is assumed that the touch device is also the display (e.g. most mobile devices). However, in situtations where that is not the case (e.g. MacBook trackpad), the values will be measured assuming the touch device is a unit square. In that case all pan positions are (0,0) to (1,1), while all pinch spreads are 0 to sqrt(2).

Constructor & Destructor Documentation

CoreGestureEvent() [1/3]

cugl::CoreGestureEvent::CoreGestureEvent ( )

inline

Constructs a new gesture event with the default values

CoreGestureEvent() [2/3]

cugl::CoreGestureEvent::CoreGestureEvent ( const Timestamp &  start )

inline

Constructs a new gesture event with the given timestamps

Parameters

start

The initial timestamp

CoreGestureEvent() [3/3]

cugl::CoreGestureEvent::CoreGestureEvent ( const CoreGestureEvent &  event )

inline

Constructs a new gesture event that is a copy of the given one

Parameters

event

The event to copy

Member Function Documentation

clear()

void cugl::CoreGestureEvent::clear ( )

inline

Clears the contents of this gesture event

Member Data Documentation

currAngle

float cugl::CoreGestureEvent::currAngle

The current angle of the gesture

currPosition

Vec2 cugl::CoreGestureEvent::currPosition

The current position of the gesture

currSpread

float cugl::CoreGestureEvent::currSpread

The current finger separation of the gesture

now

Timestamp cugl::CoreGestureEvent::now

The current time of the gesture

origAngle

float cugl::CoreGestureEvent::origAngle

The initial angle of the gesture

origPosition

Vec2 cugl::CoreGestureEvent::origPosition

The initial position of the gesture

origSpread

float cugl::CoreGestureEvent::origSpread

The initial finger separation of the gesture

start

Timestamp cugl::CoreGestureEvent::start

The starting time of the gesture

type

CoreGestureType cugl::CoreGestureEvent::type

The gesture type

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The documentation for this class was generated from the following file:

• include/cugl/input/gestures/CUCoreGesture.h