annotationline.java

JAVA网络三维技术3D的设计与实现

//
//  CLASS
//    AnnotationLine	-  3D line used for annotation & diagrams
//
//  DESCRIPTION
//    This class creates a 3D, unlighted line between two 3D coordinates.
//    The line's width and color can be controlled.
//
//  SEE ALSO
//    AnnotationArrow
//
//  AUTHOR
//    David R. Nadeau / San Diego Supercomputer Center
//
//
package Java3DApplet;
import java.awt.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.geometry.*;

class AnnotationLine
	extends Primitive
{
	// Parameters
	private float   lineWidth = 1;
	private Color3f lineColor = new Color3f( 1.0f, 1.0f, 1.0f );

	// 3D nodes
	private Shape3D shape = null;
	private LineAttributes lineAttributes = null;
	private ColoringAttributes coloringAttributes = null;
	private LineArray line = null;
	protected Appearance mainAppearance = null;


	//
	//  Construct a straight line
	//
	public AnnotationLine( float x2, float y2, float z2 )
	{
		//    origin            to given coordinate
		this( 0.0f, 0.0f, 0.0f, x2, y2, z2 );
	}

	public AnnotationLine( float x, float y, float z,
		float x2, float y2, float z2 )
	{
		float[] coord    = new float[3];
		float[] texcoord = new float[2];

		// Build a shape
		shape = new Shape3D( );
		shape.setCapability( Shape3D.ALLOW_APPEARANCE_WRITE );

		// Create geometry for a 2-vertex straight line
		line = new LineArray( 2,
			GeometryArray.COORDINATES | GeometryArray.TEXTURE_COORDINATE_2 );
		line.setCapability( GeometryArray.ALLOW_COLOR_WRITE );

		// Starting point
		coord[0] = x;
		coord[1] = y;
		coord[2] = z;
		texcoord[0] = 0.0f;
		texcoord[1] = 0.0f;
		line.setCoordinate( 0, coord );
		line.setTextureCoordinate( 0, texcoord );

		// Ending point
		coord[0] = x2;
		coord[1] = y2;
		coord[2] = z2;
		texcoord[0] = 1.0f;
		texcoord[1] = 0.0f;
		line.setCoordinate( 1, coord );
		line.setTextureCoordinate( 1, texcoord );

		shape.setGeometry( line );

		// Create an appearance
		mainAppearance = new Appearance( );
		mainAppearance.setCapability(
			Appearance.ALLOW_LINE_ATTRIBUTES_WRITE );
		mainAppearance.setCapability(
			Appearance.ALLOW_COLORING_ATTRIBUTES_WRITE );

		lineAttributes = new LineAttributes( );
		lineAttributes.setLineWidth( lineWidth );
		mainAppearance.setLineAttributes( lineAttributes );

		coloringAttributes = new ColoringAttributes( );
		coloringAttributes.setColor( lineColor );
		coloringAttributes.setShadeModel( ColoringAttributes.SHADE_FLAT );
		mainAppearance.setColoringAttributes( coloringAttributes );

		addChild( shape );
	}


	//
	//  Control the line width
	//
	public float getLineWidth( )
	{
		return lineWidth;
	}

	public void setLineWidth( float width )
	{
		lineWidth = width;
		lineAttributes.setLineWidth( lineWidth );
		mainAppearance.setLineAttributes( lineAttributes );
		shape.setAppearance( mainAppearance );
	}


	//
	//  Control the line color
	//
	public void getLineColor( Color3f color )
	{
		lineColor.get( color );
	}

	public void getLineColor( float[] color )
	{
		lineColor.get( color );
	}

	public void setLineColor( Color3f color )
	{
		lineColor.set( color );
		coloringAttributes.setColor( lineColor );
		mainAppearance.setColoringAttributes( coloringAttributes );
		shape.setAppearance( mainAppearance );
	}

	public void setLineColor( float r, float g, float b )
	{
		lineColor.set( r, g, b );
		coloringAttributes.setColor( lineColor );
		mainAppearance.setColoringAttributes( coloringAttributes );
		shape.setAppearance( mainAppearance );
	}

	public void setLineColor( float[] color )
	{
		lineColor.set( color );
		coloringAttributes.setColor( lineColor );
		mainAppearance.setColoringAttributes( coloringAttributes );
		shape.setAppearance( mainAppearance );
	}


	//
	//  Control the appearance
	//
	public void setAppearance( Appearance app )
	{
		mainAppearance = app;
		mainAppearance.setCapability(
			Appearance.ALLOW_LINE_ATTRIBUTES_WRITE );
		mainAppearance.setCapability(
			Appearance.ALLOW_COLORING_ATTRIBUTES_WRITE );
		mainAppearance.setLineAttributes( lineAttributes );
		mainAppearance.setColoringAttributes( coloringAttributes );
		shape.setAppearance( mainAppearance );
	}


	//
	//  Provide info on the shape and geometry
	//
	public Shape3D getShape( int partid )
	{
		return shape;
	}

	public int getNumTriangles( )
	{
		return 0;
	}

	public int getNumVertices( )
	{
		return 2;
	}

        public  Appearance getAppearance(int partId)
        {
                return getShape(partId).getAppearance();
        }
}