<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">package X3dForWebAuthors.Chapter11LightingEnvironmentalEffects;

import org.web3d.x3d.jsail.Core.*;
import org.web3d.x3d.jsail.EnvironmentalEffects.*;
import org.web3d.x3d.jsail.fields.*;
import org.web3d.x3d.jsail.Grouping.*;
import org.web3d.x3d.jsail.Scripting.*;
import org.web3d.x3d.jsail.Shape.*;
import org.web3d.x3d.jsail.Text.*;
import org.web3d.x3d.jsail.Time.*;

// Javadoc metadata annotations follow, see below for X3DJSAIL Java source code.
/**
 * &lt;p&gt; Interpolate between Background color arrays to show a gradually changing time-of-day effect. &lt;/p&gt;
 &lt;p&gt; Related links: Catalog page &lt;a href="../../../Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDayIndex.html" target="_blank"&gt;BackgroundTimeOfDay&lt;/a&gt;,  source &lt;a href="../../../Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay.java"&gt;BackgroundTimeOfDay.java&lt;/a&gt;, &lt;a href="https://www.web3d.org/x3d/content/examples/X3dResources.html" target="_blank"&gt;X3D Resources&lt;/a&gt;, &lt;a href="https://www.web3d.org/x3d/content/examples/X3dSceneAuthoringHints.html" target="_blank"&gt;X3D Scene Authoring Hints&lt;/a&gt;, and &lt;a href="https://www.web3d.org/x3d/content/X3dTooltips.html" target="_blank"&gt;X3D Tooltips&lt;/a&gt;. &lt;/p&gt;
	&lt;table style="color:black; border:0px solid; border-spacing:10px 0px;"&gt;
        &lt;caption&gt;Scene Meta Information&lt;/caption&gt;
		&lt;tr style="background-color:silver; border-color:silver;"&gt;
			&lt;td style="text-align:center; padding:10px 0px;"&gt;&lt;i&gt;meta tags&lt;/i&gt;&lt;/td&gt;
			&lt;td style="text-align:left;   padding:10px 0px;"&gt;&amp;nbsp; Document Metadata &lt;/td&gt;
		&lt;/tr&gt;

		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; title &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay.x3d"&gt;BackgroundTimeOfDay.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; description &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; Interpolate between Background color arrays to show a gradually changing time-of-day effect. &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; creator &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; Don Brutzman and MV4205 class &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; created &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; 22 April 2009 &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; modified &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; 20 October 2019 &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter11LightingEnvironment/BackgroundSelector.x3d" target="_blank"&gt;https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter11LightingEnvironment/BackgroundSelector.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; subject &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; X3D Background example &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; identifier &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay.x3d" target="_blank"&gt;https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; generator &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; X3D-Edit 3.3, &lt;a href="https://savage.nps.edu/X3D-Edit" target="_blank"&gt;https://savage.nps.edu/X3D-Edit&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; license &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter11LightingEnvironmentalEffects/../license.html"&gt;../license.html&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr style="background-color:silver; border-color:silver;"&gt;
			&lt;td style="text-align:center;" colspan="2"&gt;  &amp;nbsp; &lt;/td&gt;
		&lt;/tr&gt;
	&lt;/table&gt;

	&lt;p&gt;
		This program uses the
		&lt;a href="https://www.web3d.org/specifications/java/X3DJSAIL.html" target="_blank"&gt;X3D Java Scene Access Interface Library (X3DJSAIL)&lt;/a&gt;.
		It has been produced using the 
		&lt;a href="https://www.web3d.org/x3d/stylesheets/X3dToJava.xslt" target="_blank"&gt;X3dToJava.xslt&lt;/a&gt;
		stylesheet
	       (&lt;a href="https://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/stylesheets/X3dToJava.xslt" target="_blank"&gt;version control&lt;/a&gt;)
                which is used to create Java source code from an original &lt;code&gt;.x3d&lt;/code&gt; model.
	&lt;/p&gt;

	* @author Don Brutzman and MV4205 class
 */

public class BackgroundTimeOfDay
{
	/** Default constructor to create this object. */
	public BackgroundTimeOfDay ()
	{
	  initialize();
	}

	/** Create and initialize the X3D model for this object. */
	public final void initialize()
	{
            try { // catch-all
  x3dModel = new X3D().setProfile(X3D.PROFILE_IMMERSIVE).setVersion(X3D.VERSION_3_3)
  .setHead(new head()
    .addMeta(new meta().setName(meta.NAME_TITLE      ).setContent("BackgroundTimeOfDay.x3d"))
    .addMeta(new meta().setName(meta.NAME_DESCRIPTION).setContent("Interpolate between Background color arrays to show a gradually changing time-of-day effect."))
    .addMeta(new meta().setName(meta.NAME_CREATOR    ).setContent("Don Brutzman and MV4205 class"))
    .addMeta(new meta().setName(meta.NAME_CREATED    ).setContent("22 April 2009"))
    .addMeta(new meta().setName(meta.NAME_MODIFIED   ).setContent("20 October 2019"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter11LightingEnvironment/BackgroundSelector.x3d"))
    .addMeta(new meta().setName(meta.NAME_SUBJECT    ).setContent("X3D Background example"))
    .addMeta(new meta().setName(meta.NAME_IDENTIFIER ).setContent("https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay.x3d"))
    .addMeta(new meta().setName(meta.NAME_GENERATOR  ).setContent("X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"))
    .addMeta(new meta().setName(meta.NAME_LICENSE    ).setContent("../license.html")))
  .setScene(new Scene()
    .addChild(new WorldInfo().setTitle("BackgroundTimeOfDay.x3d"))
    .addChild(new Transform().setTranslation(0.0,3.0,0.0)
      .addChild(new Shape()
        .setGeometry(new Text().setString(new String[] {"Background Time Of Day"})
          .setFontStyle(new FontStyle().setJustify(FontStyle.JUSTIFY_MIDDLE_MIDDLE)))
        .setAppearance(new Appearance()
          .setMaterial(new Material()))))
    .addChild(new TimeSensor("TimeOfDayClock").setCycleInterval(6).setLoop(true))
    .addChild(new Script("BackgroundColorInterpolator").setSourceCode("""
ecmascript:

function initialize()
{
    Browser.println ('groundColorSunrise length=' + groundColorSunrise.length + ' '  + groundColorSunrise.toString());
    Browser.println ('groundColorNoon    length=' +    groundColorNoon.length +    ' '  + groundColorNoon.toString());
    Browser.println ('groundColorSunset  length=' +  groundColorSunset.length +  ' '  + groundColorSunset.toString());
    Browser.println ('groundColorNight   length=' +   groundColorNight.length +   ' '  + groundColorNight.toString());
    Browser.println ('skyColorSunrise    length=' +    skyColorSunrise.length +    ' '  + skyColorSunrise.toString());
    Browser.println ('skyColorNoon       length=' +       skyColorNoon.length +       ' '  + skyColorNoon.toString());
    Browser.println ('skyColorSunset     length=' +     skyColorSunset.length +     ' '  + skyColorSunset.toString());
    Browser.println ('skyColorNight      length=' +      skyColorNight.length +      ' '  + skyColorNight.toString());
}
function set_fraction (fraction) // fraction is input value sent by TimeSensor clock
{
    // Sunrise to Noon, fraction 0.0 to 0.25, interval=0.25
    if      (fraction &lt; 0.25)
    {
        groundColor_changed = interpolate (groundColorSunrise, groundColorNoon, fraction, 0.00, 0.25);
           skyColor_changed = interpolate (   skyColorSunrise,    skyColorNoon, fraction, 0.00, 0.25);
    }
    // Noon to Evening, fraction 0.25 to 0.5, interval=0.25
    else if (fraction &lt; 0.5)
    {
        groundColor_changed = interpolate (groundColorNoon, groundColorSunset, fraction, 0.25, 0.25);
           skyColor_changed = interpolate (   skyColorNoon,    skyColorSunset, fraction, 0.25, 0.25);
    }
    // Evening to Night, fraction 0.5 to 0.6, interval=0.1
    else if (fraction &lt; 0.6)
    {
        groundColor_changed = interpolate (groundColorSunset, groundColorNight, fraction, 0.5, 0.1);
           skyColor_changed = interpolate (   skyColorSunset,    skyColorNight, fraction, 0.5, 0.1);
    }
    // Night (unchanging), fraction 0.6 to 0.95, interval=0.35
    else if (fraction &lt; 0.95)
    {
        groundColor_changed = groundColorNight;
           skyColor_changed = skyColorNight;
    }
    // Night to Sunrise, fraction 0.95 to 1.0, interval=0.05
    else // (fraction &lt; 1.0)
    {
        groundColor_changed = interpolate (groundColorNight, groundColorSunrise, fraction, 0.95, 0.05);
           skyColor_changed = interpolate (   skyColorNight,    skyColorSunrise, fraction, 0.95, 0.05);
    }
//    Browser.println ('groundColor_changed=' + groundColor_changed.toString());
//    Browser.println ('   skyColor_changed=' +    skyColor_changed.toString());
}
function interpolate (firstColorArray, secondColorArray, fraction, initialFraction, interval)
{
    f = (fraction - initialFraction) / interval; // f should range from 0 to 1
//  Browser.println ('initialFraction=' + initialFraction + ', fraction=' + fraction + ', f=' + f);

    color0 = firstColorArray[0] + (secondColorArray[0] - firstColorArray[0]) * f;
    color1 = firstColorArray[1] + (secondColorArray[1] - firstColorArray[1]) * f;
    color2 = firstColorArray[2] + (secondColorArray[2] - firstColorArray[2]) * f;
    color3 = firstColorArray[3] + (secondColorArray[3] - firstColorArray[3]) * f;
    color4 = firstColorArray[4] + (secondColorArray[4] - firstColorArray[4]) * f;
    return new MFColor (color0, color1, color2, color3, color4);
}
""")
      .addField(new field().setName("set_fraction").setType(field.TYPE_SFFLOAT).setAccessType(field.ACCESSTYPE_INPUTONLY))
      .addField(new field().setName("groundColorSunrise").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {0.133,0.419,0.0,0.36,0.1,0.0,1.0,0.74,0.4,1.0,0.74,0.4,0.0,0.2,0.75,0.0,0.1,0.5}))))
      .addField(new field().setName("groundColorNoon").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {0.133,0.419,0.0,0.36,0.1,0.0,1.0,0.74,0.4,1.0,0.74,0.4,0.0,0.0,0.5,0.0,0.0,0.2}))))
      .addField(new field().setName("groundColorSunset").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {0.133,0.419,0.0,0.36,0.1,0.0,1.0,0.74,0.4,1.0,0.74,0.4,0.0,0.0,0.5,0.0,0.0,0.2}))))
      .addField(new field().setName("groundColorNight").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {0.133,0.419,0.0,0.36,0.1,0.0,1.0,0.74,0.4,1.0,0.74,0.4,0.0,0.0,0.5,0.0,0.0,0.2}))))
      .addField(new field().setName("skyColorSunrise").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {1.0,1.0,0.2,1.0,1.0,0.0,0.36,0.63,1.0,0.0,0.4,1.0,0.0,0.4,1.0}))))
      .addField(new field().setName("skyColorNoon").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {0.0,0.035,0.34,0.0,0.015,0.44,0.0,0.05,0.5,0.0,0.1,0.6,0.44,0.8,1.0,1.0,1.0,0.7}))))
      .addField(new field().setName("skyColorSunset").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {0.0,0.0,0.38,0.0,0.0,0.68,0.5,0.2,1.0,0.5,0.2,1.0,1.0,0.3,0.0,1.0,0.2,0.8}))))
      .addField(new field().setName("skyColorNight").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(new MFColor(new MFColor(new double[] {1.0,1.0,1.0,0.8,0.8,0.8,0.1,0.1,0.1,0.0,0.0,0.0,0.0,0.0,0.0}))))
      .addField(new field().setName("groundColor_changed").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_OUTPUTONLY))
      .addField(new field().setName("skyColor_changed").setType(field.TYPE_MFCOLOR).setAccessType(field.ACCESSTYPE_OUTPUTONLY)))
    .addChild(new ROUTE().setFromNode("TimeOfDayClock").setFromField("fraction_changed").setToNode("BackgroundColorInterpolator").setToField("set_fraction"))
    .addChild(new Background("AnimatedBackground").setGroundAngle(new double[] {0.03,1.26,1.5,1.57}).setGroundColor(new MFColor(new double[] {0.133333,0.419608,0.0,0.36,0.1,0.0,1.0,0.74,0.4,0.0,0.0,0.5,0.0,0.0,0.2})).setSkyAngle(new double[] {0.03,0.05,1.5,1.57}).setSkyColor(new MFColor(new double[] {1.0,1.0,1.0,0.8,0.8,0.8,0.1,0.1,0.1,0.0,0.0,0.0,0.0,0.0,0.0})))
    .addChild(new ROUTE().setFromNode("BackgroundColorInterpolator").setFromField("groundColor_changed").setToNode("AnimatedBackground").setToField("groundColor"))
    .addChild(new ROUTE().setFromNode("BackgroundColorInterpolator").setFromField("skyColor_changed").setToNode("AnimatedBackground").setToField("skyColor")));
            }
            catch (Exception ex)
            {       
                System.err.println ("*** Further hints on X3DJSAIL errors and exceptions at");
                System.err.println ("*** https://www.web3d.org/specifications/java/X3DJSAIL.html");
                throw (ex);
            }
	}
	// end of initialize() method

	/** The initialized model object, created within initialize() method. */
	private X3D x3dModel;

	/** 
	 * Provide a 
	 * &lt;a href="https://dzone.com/articles/java-copy-shallow-vs-deep-in-which-you-will-swim" target="_blank"&gt;shallow copy&lt;/a&gt;
	 * of the X3D model.
	 * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/Core/X3D.html"&gt;X3D&lt;/a&gt;
	 * @return BackgroundTimeOfDay model
	 */
	public X3D getX3dModel()
	{	  
		return x3dModel;
	}
	   
    /** 
     * Default main() method provided for test purposes, uses CommandLine to set global ConfigurationProperties for this object.
     * @param args array of input parameters, provided as arguments
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/Core/X3D.html#handleArguments-java.lang.String:A-"&gt;X3D.handleArguments(args)&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/Core/X3D.html#validationReport--"&gt;X3D.validationReport()&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/CommandLine.html"&gt;CommandLine&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/CommandLine.html#USAGE"&gt;CommandLine.USAGE&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/ConfigurationProperties.html"&gt;ConfigurationProperties&lt;/a&gt;
     */
    public static void main(String args[])
    {
        System.out.println("Build this X3D model, showing validation diagnostics...");
        X3D thisExampleX3dModel = new BackgroundTimeOfDay().getX3dModel();
//      System.out.println("X3D model construction complete.");
	
        // next handle command line arguments
        boolean hasArguments = (args != null) &amp;&amp; (args.length &gt; 0);
        boolean validate = true; // default
        boolean argumentsLoadNewModel = false;
        String  fileName = new String();

        if (args != null)
        {
                for (String arg : args)
                {
                        if (arg.toLowerCase().startsWith("-v") || arg.toLowerCase().contains("validate"))
                        {
                                validate = true; // making sure
                        }
                        if (arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_X3D) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_CLASSICVRML) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_X3DB) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_VRML97) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_EXI) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_GZIP) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_ZIP) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_HTML) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_XHTML))
                        {
                                argumentsLoadNewModel = true;
                                fileName = arg;
                        }
                }
        }
        if      (argumentsLoadNewModel)
                System.out.println("WARNING: \"X3dForWebAuthors.Chapter11LightingEnvironmentalEffects.BackgroundTimeOfDay\" model invocation is attempting to load file \"" + fileName + "\" instead of simply validating itself... file loading ignored.");
        else if (hasArguments) // if no arguments provided, this method produces usage warning
                thisExampleX3dModel.handleArguments(args);
	
        if (validate)
        {
            //  System.out.println("--- TODO fix duplicated outputs ---"); // omit when duplicated outputs problem is solved/refactored
		String validationResults = thisExampleX3dModel.validationReport();
            //  System.out.println("-----------------------------------"); // omit when duplicated outputs problem is solved/refactored
                System.out.print("X3dForWebAuthors.Chapter11LightingEnvironmentalEffects.BackgroundTimeOfDay self-validation test confirmation: ");
                if (!validationResults.equals("success"))
                    System.out.println();
                System.out.println(validationResults.trim());

                // experimental: test X3DJSAIL output files
                // Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay_JavaExport.* file validation is checked when building X3D Example Archives
                String filenameX3D  = "Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay_JavaExport.x3d"; 
                String filenameX3DV = "Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay_JavaExport.x3dv"; 
                String filenameJSON = "Chapter11LightingEnvironmentalEffects/BackgroundTimeOfDay_JavaExport.json";
                thisExampleX3dModel.toFileX3D        (filenameX3D);
                thisExampleX3dModel.toFileClassicVRML(filenameX3DV);
// TODO         thisExampleX3dModel.toFileJSON       (filenameJSON);
        }
    }
}
</pre></body></html>