📄 extext.htm

📁 详细介绍Java 3D编程的一本电子书
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<TITLE>ExText.java</TITLE>
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<CENTER>Building text shapes</CENTER></FONT>
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<CENTER><B><I>ExText.java</I></B></CENTER></FONT>
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//
//  CLASS
//    ExText  -  illustrate use of 3D text
//
//  LESSON
//    Use Text3D to define Shape3D geometry
//
//  AUTHOR
//    David R. Nadeau / San Diego Supercomputer Center
//

import java.awt.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.geom.*;

public class ExText
	extends Example
{
	//--------------------------------------------------------------
	//  SCENE CONTENT
	//--------------------------------------------------------------

	//
	//  Nodes (updated via menu)
	//
	private FontExtrusion extrusion = null;
	private Shape3D shape = null;
	private Group scene = null;
	private BranchGroup textGroup = null;


	//
	//  Build scene
	//
	public Group buildScene( )
	{
		// Get the current font attributes
		Font font = (Font)fonts[currentFont].value;
		String textString = (String)fonts[currentFont].name;

		// Turn on the example headlight
		setHeadlightEnable( true );

		// Build the scene group
		scene = new Group( );
		scene.setCapability( Group.ALLOW_CHILDREN_EXTEND );
		scene.setCapability( Group.ALLOW_CHILDREN_WRITE );

		// Build a branch group to hold the text shape
		// (this allows us to remove the text shape later,
		// change it, then put it back, all under menu control)
		textGroup = new BranchGroup( );
		textGroup.setCapability( BranchGroup.ALLOW_DETACH );
		scene.addChild( textGroup );


	// BEGIN EXAMPLE TOPIC
		// Create a font extrusion with a default extrusion shape
		extrusion = new FontExtrusion( );

		// Define a 3D font with a default extrusion path
		Font3D font3d = new Font3D( font, extrusion );

		// Build 3D text geometry using the 3D font
		Text3D tex = new Text3D( );
		tex.setFont3D( font3d );
		tex.setString( textString );
		tex.setAlignment( Text3D.ALIGN_CENTER );

		// Define a generic shaded appearance
		Appearance app = new Appearance( );
		Material mat = new Material( );
		mat.setLightingEnable( true );
		app.setMaterial( mat );

		// Assemble geometry and appearance into a shape
		// and add it to the scene
		shape = new Shape3D( tex, app );
		shape.setCapability( Shape3D.ALLOW_GEOMETRY_WRITE );
		textGroup.addChild( shape );
	// END EXAMPLE TOPIC

		return scene;
	}



	//--------------------------------------------------------------
	//  USER INTERFACE
	//--------------------------------------------------------------

	//
	//  Main
	//
	public static void main( String[] args )
	{
		ExText ex = new ExText( );
		ex.initialize( args );
		ex.buildUniverse( );
		ex.showFrame( );
	}

	//  Font menu choices
	private NameValue[] fonts = null;
	private int currentFont = 0;
	private CheckboxMenu fontMenu = null;




	//
	//  Initialize the GUI (application and applet)
	//
	public void initialize( String[] args )
	{
		// Initialize the window, menubar, etc.
		super.initialize( args );
		exampleFrame.setTitle( "Java 3D Text Example" );


		//
		//  Add a menubar menu to change node parameters
		//    Font --&gt;
		//

		Menu m = new Menu( "Font3D" );

		// Get a list of available fonts
		GraphicsEnvironment ge =
			GraphicsEnvironment.getLocalGraphicsEnvironment( );
		String[] fontNames = ge.getAvailableFontFamilyNames( );
		fonts = new NameValue[fontNames.length];
		Font newFont = null;

		// Add those fonts to a list and build the font menu
		if ( debug )
			System.err.println( "Loading fonts..." );
		for ( int i = 0; i &lt; fontNames.length; i++ )
		{
			if ( debug )
				System.err.println( "  " + fontNames[i] );
			newFont  = new Font( fontNames[i], Font.PLAIN, 1 );
			fonts[i] = new NameValue( fontNames[i], newFont );
		}
		fontMenu = new CheckboxMenu( "Font", fonts,
			currentFont, this );
		m.add( fontMenu );

		exampleMenuBar.add( m );
	}


	//
	//  Handle checkboxes and menu choices
	//
	public void checkboxChanged( CheckboxMenu menu, int check )
	{
		if ( menu == fontMenu )
		{
			// Change the 2D font used to build a 3D font
			currentFont = check;
			String fontName = (String)fonts[currentFont].name;
			Font font = (Font)fonts[currentFont].value;
			Font3D font3d = new Font3D( font, extrusion );

			Text3D tex = new Text3D( );
			tex.setFont3D( font3d );
			tex.setString( fontName );
			tex.setAlignment( Text3D.ALIGN_CENTER );

			scene.removeChild( 0 );
			shape.setGeometry( tex );
			scene.addChild( textGroup );

			if ( debug )
				System.err.println( "Font set to " + fontName );
			return;
		}

		// Handle all other checkboxes
		super.checkboxChanged( menu, check );
	}

}
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