Package com.luciad.input.touch

Class TLcdTouchPoint

java.lang.Object

com.luciad.input.touch.TLcdTouchPoint

public class TLcdTouchPoint
extends Object

This class describes the (change in) state of a single touch point. It is used in TLcdTouchEvent instances to describe the state of every touch point of that particular event.

A touch point can have four different states which are grouped in the TLcdTouchPoint.State enumeration. When touch points change state, the application is warned by means of a TLcdTouchEvent. This event contains TLcdTouchPoint instances for every touch point, both the one that has changed state as well as the ones which remained unchanged.

Every touch point can be identified by an identifier that is unique for a given touch event ID. It is assigned when a finger is put down and remains the same until it is lifted and no more double click events can be generated for it.

Since:

10.0

See Also:

• TLcdTouchEvent

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	TLcdTouchPoint.State	Enumeration of the supported states of touch points.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	FINGER_TIP_TOUCH_POINT_TYPE	String indicating the touch point was made by the tip of a finger.
static final String	HAND_PALM_TOUCH_POINT_TYPE	String indicating the touch point was made by a hand palm.
static final String	UNKNOWN_TOUCH_POINT_TYPE	String indicating the type of touch point is not known.

Constructor Summary

Constructors

Constructor	Description
TLcdTouchPoint(TLcdTouchPoint.State aState, long aID, Point aLocation, int aTapCount, String aType, boolean aConsumed)	Create a new TLcdTouchPoint.
TLcdTouchPoint(TLcdTouchPoint.State aState, long aID, Point aLocation, int aTapCount, String aType, boolean aConsumed, long aCxContact, long aCyContact)	Create a new TLcdTouchPoint.

Method Summary

Modifier and Type	Method	Description
TLcdTouchPoint	cloneAs(TLcdTouchPoint.State aState, long aTouchPointID, Point aLocation, int aTapCount, String aTouchPointType, boolean aConsumed, long aCxContact, long aCyContact)	Create a new instance of this class based on the information passed as parameters to this method.
long	getContactAreaHeight()	Returns the height of the contact area in pixels.
long	getContactAreaWidth()	Returns the width of the contact area in pixels.
static String	getDisplayName(TLcdTouchPoint.State aState)	Returns a String representation of aState.
long	getID()	Returns the unique ID of the touch point.
Point	getLocation()	The location of the touch point.
TLcdTouchPoint.State	getState()	The state of the touch point which is described by this TLcdTouchPoint.
int	getTapCount()	Returns the number of times the user touched the touch device for this touch point.
String	getType()	Returns the type of the touch point (e.g. fingertip, hand palm, stylus, ...).
boolean	isConsumed()	Returns whether this touch point is consumed or not.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

UNKNOWN_TOUCH_POINT_TYPE

public static final String UNKNOWN_TOUCH_POINT_TYPE

String indicating the type of touch point is not known.

See Also:

• getType()
• Constant Field Values

HAND_PALM_TOUCH_POINT_TYPE

public static final String HAND_PALM_TOUCH_POINT_TYPE

String indicating the touch point was made by a hand palm.

See Also:

• getType()
• Constant Field Values

FINGER_TIP_TOUCH_POINT_TYPE

public static final String FINGER_TIP_TOUCH_POINT_TYPE

String indicating the touch point was made by the tip of a finger.

See Also:

• getType()
• Constant Field Values

Constructor Details

TLcdTouchPoint

public TLcdTouchPoint(TLcdTouchPoint.State aState,
 long aID,
 Point aLocation,
 int aTapCount,
 String aType,
 boolean aConsumed)

Create a new TLcdTouchPoint.

Parameters:

aState - the state of the touch point

aID - unique ID allowing to determine of which touch point this event describes the change in state

aLocation - the location of the touch. See getLocation() for more information on how this location is specified

aTapCount - the number of times the user touched the touch device for this touch point. See getTapCount() for more information.

aType - the type of the touch point (e.g. fingertip, hand palm, stylus,

aConsumed - indicates whether this touch point is consumed. See isConsumed() for more information

TLcdTouchPoint

public TLcdTouchPoint(TLcdTouchPoint.State aState,
 long aID,
 Point aLocation,
 int aTapCount,
 String aType,
 boolean aConsumed,
 long aCxContact,
 long aCyContact)

Create a new TLcdTouchPoint.

Parameters:

aState - the state of the touch point

aID - unique ID allowing to determine of which touch point this event describes the change in state

aLocation - the location of the touch. See getLocation() for more information on how this location is specified

aTapCount - the number of times the user touched the touch device for this touch point. See getTapCount() for more information.

aType - the type of the touch point (e.g. fingertip, hand palm, stylus,

aConsumed - indicates whether this touch point is consumed. See isConsumed() for more information

aCxContact - the width of the touched area in pixels

aCyContact - the width of the touched area in pixels

Method Details

getID

public long getID()

Returns the unique ID of the touch point.

From the creation of the touch point (see TLcdTouchPoint.State.DOWN) until the removal (see TLcdTouchPoint.State.UP) of the touch point, this ID will be the same for all TLcdTouchPoint instances describing a change in state of this particular touch point.

Other touch points originating from the same device and same user which are active at the same time must have another ID. This allows to track the movements and/or state of multiple touch points simultaneously.

As soon as a touch point is removed (TLcdTouchPoint.State.UP) and the tap count for this point could no longer increase, this ID becomes available and may be reused to describe the state of a new touch point.

Returns:

the unique ID of the touch point

See Also:

• TLcdTouchEvent.getTouchDeviceID()
• TLcdTouchEvent.getUserID()

getState

public TLcdTouchPoint.State getState()

The state of the touch point which is described by this TLcdTouchPoint.

Returns:

the state of the touch point which is described by this TLcdTouchPoint

getLocation

public Point getLocation()

The location of the touch point. Depending on the state of the touch point, it is defined as:

• TLcdTouchPoint.State.DOWN: the location where the touch point is created.
• TLcdTouchPoint.State.MOVED: the new location of the touch point. In order to be able to determine the actual move, the location should be compared to the location of the previous TLcdTouchPoint of the same touch point.
• TLcdTouchPoint.State.STATIONARY: the location of the touch point. It should always be the same as the location received in the previous TLcdTouchPoint since the touch point remained stationary.
• TLcdTouchPoint.State.UP: the last location of the touch point before it was removed.

The location is expressed relative to the source component of the TLcdTouchEvent containing this TLcdTouchPoint.

Returns:

the location of the touch point

getTapCount

public int getTapCount()

Returns the number of times the user touched the touch device for this touch point.

The tap count is only valid when the touch point is TLcdTouchPoint.State.DOWN created, and will be at least one. For all other states, this method returns 0.

Returns:

the number of times the user touched the touch device for this touch point

toString

public String toString()

Overrides:

toString in class Object

getType

public String getType()

Returns the type of the touch point (e.g. fingertip, hand palm, stylus, ...).

Some predefined values are available as static fields of this class.

Returns:

the type of the touch point

isConsumed

public boolean isConsumed()

Returns whether this touch point is consumed or not. Classes which handle TLcdTouchEvents can use this state to determine whether they handle this touch point or not.

Note: it is left to the concrete handlers of TLcdTouchEvents to decide whether and how they use this property.

Returns:

true when this touch point is consumed, false otherwise

cloneAs

public TLcdTouchPoint cloneAs(TLcdTouchPoint.State aState,
 long aTouchPointID,
 Point aLocation,
 int aTapCount,
 String aTouchPointType,
 boolean aConsumed,
 long aCxContact,
 long aCyContact)

Create a new instance of this class based on the information passed as parameters to this method.

This method should be overridden by extensions of this class if they want to include their info in the newly created touch point.

Parameters:

aState - the touch point state for the new TLcdTouchPoint

aTouchPointID - the ID for the new TLcdTouchPoint

aLocation - the location for the new TLcdTouchPoint

aTapCount - the tap count for the new TLcdTouchPoint

aTouchPointType - the touch point type for the new TLcdTouchPoint

aConsumed - the consumed state for the new TLcdTouchPoint

aCxContact - the width of the touched area for the new TLcdTouchPoint

aCyContact - the height of the touched area for the new TLcdTouchPoint

Returns:

a new TLcdTouchPoint

See Also:

• TLcdTouchEvent.cloneAs(long, Object, java.util.List, long, String, long)

getDisplayName

public static String getDisplayName(TLcdTouchPoint.State aState)

Returns a String representation of aState.

Parameters:

aState - the state

Returns:

a String representation of aState

getContactAreaWidth

public long getContactAreaWidth()

Returns the width of the contact area in pixels. A value of 0 means that the information is not available.

Returns:

the width of the contact area.

getContactAreaHeight

public long getContactAreaHeight()

Returns the height of the contact area in pixels. A value of 0 means that the information is not available.

Returns:

the height of the contact area.