The Sensor Object in Java

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1023 The Sensor Object
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number of SensorRead objects and the number of buttons are determined at Sensor construction time
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public void getHotspot(Point3d hotspot) public void setHotspot(Point3d hotspot)
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These methods set and retrieve the sensor s hotspot offset The hotspot is speci ed in the sensor s local coordinate system
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public void lastRead(Transform3D read) public void lastRead(Transform3D read, int kth)
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These methods extract the most recent sensor reading and the kth most recent sensor reading from the Sensor object In both cases, the methods copy the sensor value into the speci ed argument
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public void getRead(Transform3D read) public void getRead(Transform3D read, long deltaT)
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The rst method computes the sensor reading consistent with the prediction policy and copies that value into the read matrix The second method computes the sensor reading consistent as of time deltaT in the future and copies that value into the read matrix All times are in milliseconds
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public long lastTime() public long lastTime(int k)
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These methods return the time associated with the most recent sensor reading and with the kth most recent sensor reading, respectively
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public int lastButtons() public int lastButtons(int k)
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These methods return the state of the buttons associated with the most recent sensor reading and the kth most recent sensor reading, respectively
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public void setPredictor(int predictor) public int getPredictor()
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These methods set and retrieve the sensor s predictor type The predictor type is one of the following: NO_PREDICTOR, HEAD_PREDICTOR, or HAND_PREDICTOR
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public void setPredictionPolicy(int policy) public int getPredictionPolicy()
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These methods set and retrieve the sensor s predictor policy The predictor policy is either PREDICT_NONE or PREDICT_NEXT_FRAME_TIME 270
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Java 3D API Specification
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INPUT DEVICES AND PICKING public void setDevice(InputDevice device) public InputDevice getDevice()
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The SensorRead Object
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These methods set and retrieve the sensor s input device
public SensorRead getCurrentSensorRead()
This method returns the current number of SensorRead objects per sensor
public void setNextSensorRead(long time, Transform3D transform, int buttons)
This method sets the next SensorRead object to the speci ed values, including the next SensorRead s associated time, transformation, and button state array
1024 The SensorRead Object
A SensorRead object encapsulates all the information associated with a single reading of a sensor Constants
public final static int MAXIMUM_SENSOR_BUTTON_COUNT
This ag determines the maximum number of sensor-attached buttons tracked on a per-sensor basis Constructors The SensorRead object speci es the following constructor
public SensorRead()
Creates a new SensorRead object Methods
public final void set(Transform3D t1) public final void get(Transform3D result)
These methods set and retrieve the SensorRead object s transform They allow a device to store a new rotation and orientation value into the SensorRead object, and a consumer of that value to access it
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Picking public final void setTime(long time) public final long getTime()
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These methods set and retrieve the SensorRead object s timestamp They allow a device to store a new timestamp value into the SensorRead object, and a consumer of that value to access it
public final void setButtons(int values) public final int getButtons()
These methods set and retrieve the SensorRead object s button values They allow a device to store an integer that encodes the button values into the SensorRead object, and a consumer of those values to access the state of the buttons
103 Picking
Behavior nodes provide the means for building developer-speci c picking semantics An application developer can de ne custom picking semantics using Java 3D s behavior mechanism (see 9, Behaviors and Interpolators ) The developer might wish to de ne pick semantics that use a mouse to shoot a ray into the virtual universe from the current viewpoint, nd the rst object along that ray, and highlight that object when the end user releases the mouse button A typical scenario follows: 1 The application constructs a Behavior node that arms itself to awaken when AWT detects a left-mouse-button-down event 2 Upon awakening from a left-mouse-button-down event, the behavior a Updates a Switch node to draw a ray that emanates from the center of the screen b Changes that ray s TransformGroup node so that the ray points in the direction of the current mouse position c Declares its interest in mouse-move or left-mouse-button-up events 3 Upon awakening from a mouse-move event, the behavior a Changes that ray s TransformGroup node so that the ray points in the direction of the current mouse position b Declares its interest in mouse-move or left-mouse-button-up events 4 Upon awakening from a left-mouse-button-up event, the behavior a Changes that ray s TransformGroup node so that the ray points in the direction of the current mouse position 272