scratching the surface with javafx
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Scratching the Surface with JavaFXUsing JavaFX 3D & Multi-touch APIs
James WeaverJava Technology Ambassador
Author of several Java/JavaFX books
Co-leader of IoT & JavaFX communities at java.net
javafxcommunity.com
iotcommunity.net
Multi-touch considerations for JavaFX
Touch Gestures– Swipe, Scroll, Rotate, Zoom
Touch Event and Touch Points
The Pagination Control
Accommodating Fingers
Introduction to JavaFX 3D
Example app: ZenGuitar3D
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Please note
The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.
Touch Gestures
The Swipe Gesture
Commonly a finger drag in one direction A single event is produced for the gesture May be left, right, up, or down
Handling the Swipe Gesture (SwipeEvent)
Note: Lambda expressions from JDK 8 are used here to simplify event handling
Handling the Swipe Gesture (SwipeEvent)
The Scroll Gesture
User turns mouse wheel, drags finger on touch screen, etc.
Scroll events are continuously generated, containing x/y position-related info
Events are pixel-based or character/line-based
If inertia is supported, scroll events may be generated after user quits scrolling
Handling the Scroll Gesture (ScrollEvent)
The Rotate Gesture
User typically drags two fingers around each other
Rotate events are continuously generated, containing angle-related info
Handling the Rotate Gesture (RotateEvent)
The Zoom Gesture
User typically drags two fingers apart or closer together
Zoom events are continuously generated, containing zoom factor-related info
Handling the Zoom Gesture (ZoomEvent)
Touch Event and Touch Points
Thomas Laenner - http://thomas.laenner.dk/
Handling Touch (TouchEvent/TouchPoint)
A TouchEvent contains information about a touch, including:
– Event type: Pressed, released, moved, or stationary
– Touch points: The TouchPoint instances that represent each of the points that were touched
Each TouchEvent has a unique ID to identify the events and touch points in a multi-touch action
Responding to Touch Events
The Pagination Control
Using the Pagination Control
The Pagination control is used for navigation between pages
Each page is a Node subclass Numeric page indicators, or bullet-style
indicators, may be set with the style class STYLE_CLASS_BULLET
Using the Pagination Control
Accommodating Fingers
Making UI Controls Larger for Touching
The default sizes for JavaFX UI controls are conducive to using a mouse as a pointing device
An easy way to modify the default sizes is to use CSS
Making UI Controls Larger for Touching
Specify an -fx-font-size property in the #root selector
Introduction to JavaFX 3D
“JavaFX 3D gives you the ability to use 3D geometry, cameras, and lights in JavaFX.”
Jasper PottsJavaFX Engineer, Oracle Corporation
Mesh Geometry (3D Shapes)
■ Predefined shapes
■ Box
■ Cylinder
■ Sphere
■ User-defined shapes
■ Using TriangleMesh / MeshView
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Creating Primitive Shapes and Materials
3D Materials and Textures
■ PhongMaterial has these properties
■ Ambient color
■ Diffuse color, diffuse map
■ Specular color, specular map
■ Specular power
■ Bump map
■ Self-illumination map
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https://wikis.oracle.com/display/OpenJDK/3D+Features
Duke’s nose has a Diffuse Map texture
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This planet has a Bump Map texture
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UV Mapping Textures to Shapes
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Tip: A texture is a 2D image to be mapped on a 3D surface
Source: http://en.wikipedia.org/wiki/File:UVMapping.png
Placing a Texture on a Sphere
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Placing a Texture on a Sphere
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3D Lights
■ Lights are nodes in the scene graph
■ PointLight
■ AmbientLight
■ Default light provided if no active lights
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Lights, Camera, Action!
Example multi-touch app: ZenGuitar3D
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Showing the Picker (TouchEvent)
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Rotating Instrument Picker with Scroll Gesture
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Playing Strings (TouchEvent / TouchPoint)
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Switching Modes (TouchPoint#belongsTo)
GuitarString3D instance
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Setting up to Rotate on Three Axes
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Using Scroll Gesture for X/Y Rotate
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Using Rotate Gesture for Z Rotate
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Using Zoom Gesture for Scaling
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Using Timeline to Transform to Home Position
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ZenGuitar3D Uses the JFugue5 Library
■ An open-source Java API for programming music without the complexities of MIDI
■ Developed by David Koelle
■ Available at http://JFugue.org
Questions?
Scratching the Surface with JavaFXUsing JavaFX 3D & Multi-touch APIs
James WeaverJava Technology Ambassador
