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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_06) on Wed Dec 13 16:19:59 PST 2006 --><TITLE>Alpha (Java 3D 1.5.0)</TITLE><META NAME="keywords" CONTENT="javax.media.j3d.Alpha class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Alpha (Java 3D 1.5.0)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../javax/media/j3d/AlternateAppearance.html" title="class in javax.media.j3d"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html?javax/media/j3d/Alpha.html" target="_top"><B>FRAMES</B></A> <A HREF="Alpha.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.media.j3d</FONT><BR>Class Alpha</H2><PRE>java.lang.Object <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../javax/media/j3d/SceneGraphObject.html" title="class in javax.media.j3d">javax.media.j3d.SceneGraphObject</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../javax/media/j3d/NodeComponent.html" title="class in javax.media.j3d">javax.media.j3d.NodeComponent</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>javax.media.j3d.Alpha</B></PRE><HR><DL><DT><PRE>public class <B>Alpha</B><DT>extends <A HREF="../../../javax/media/j3d/NodeComponent.html" title="class in javax.media.j3d">NodeComponent</A></DL></PRE><P>The alpha NodeComponent object provides common methods for converting a time value into an alpha value (a value in the range 0 to 1). The Alpha object is effectively a function of time that generates alpha values in the range [0,1] when sampled: f(t) = [0,1]. A primary use of the Alpha object is to provide alpha values for Interpolator behaviors. The function f(t) and the characteristics of the Alpha object are determined by user-definable parameters: <p> <ul> <code>loopCount</code> -- This is the number of times to run this Alpha; a value of -1 specifies that the Alpha loops indefinitely.<p> <code>triggerTime</code> -- This is the time in milliseconds since the start time that this object first triggers. If (startTime + triggerTime >= currentTime) then the Alpha object starts running.<p> <code>phaseDelayDuration</code> -- This is an additional number of milliseconds to wait after triggerTime before actually starting this Alpha.<p> <code>mode</code> -- This can be set to INCREASING_ENABLE, DECREASING_ENABLE, or the Or'ed value of the two. INCREASING_ENABLE activates the increasing Alpha parameters listed below; DECREASING_ENABLE activates the decreasing Alpha parameters listed below.<p> </ul> Increasing Alpha parameters:<p> <ul> <code>increasingAlphaDuration</code> -- This is the period of time during which Alpha goes from zero to one. <p> <code>increasingAlphaRampDuration</code> -- This is the period of time during which the Alpha step size increases at the beginning of the increasingAlphaDuration and, correspondingly, decreases at the end of the increasingAlphaDuration. This parameter is clamped to half of increasingAlphaDuration. When this parameter is non-zero, one gets constant acceleration while it is in effect; constant positive acceleration at the beginning of the ramp and constant negative acceleration at the end of the ramp. If this parameter is zero, then the effective velocity of the Alpha value is constant and the acceleration is zero (ie, a linearly increasing alpha ramp).<p> <code>alphaAtOneDuration</code> -- This is the period of time that Alpha stays at one.<p> </ul> Decreasing Alpha parameters:<p> <ul> <code>decreasingAlphaDuration</code> -- This is the period of time during which Alpha goes from one to zero.<p> <code>decreasingAlphaRampDuration</code> -- This is the period of time during which the Alpha step size increases at the beginning of the decreasingAlphaDuration and, correspondingly, decreases at the end of the decreasingAlphaDuration. This parameter is clamped to half of decreasingAlphaDuration. When this parameter is non-zero, one gets constant acceleration while it is in effect; constant positive acceleration at the beginning of the ramp and constant negative acceleration at the end of the ramp. If this parameter is zero, the effective velocity of the Alpha value is constant and the acceleration is zero (i.e., a linearly-decreasing alpha ramp).<p> <code>alphaAtZeroDuration</code> -- This is the period of time that Alpha stays at zero. </ul><P><P><DL><DT><B>See Also:</B><DD><A HREF="../../../javax/media/j3d/Interpolator.html" title="class in javax.media.j3d"><CODE>Interpolator</CODE></A></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#DECREASING_ENABLE">DECREASING_ENABLE</A></B></CODE><BR> Specifies that the decreasing component of the alpha is used</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#INCREASING_ENABLE">INCREASING_ENABLE</A></B></CODE><BR> Specifies that the increasing component of the alpha is used.</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#Alpha()">Alpha</A></B>()</CODE><BR> Constructs an Alpha object with default parameters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#Alpha(int, int, long, long, long, long, long, long, long, long)">Alpha</A></B>(int loopCount, int mode, long triggerTime, long phaseDelayDuration, long increasingAlphaDuration, long increasingAlphaRampDuration, long alphaAtOneDuration, long decreasingAlphaDuration, long decreasingAlphaRampDuration, long alphaAtZeroDuration)</CODE><BR> This constructor takes all of the Alpha user-definable parameters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#Alpha(int, long)">Alpha</A></B>(int loopCount, long increasingAlphaDuration)</CODE><BR> This constructor takes only the loopCount and increasingAlphaDuration as parameters and assigns the default values to all of the other parameters.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#Alpha(int, long, long, long, long, long)">Alpha</A></B>(int loopCount, long triggerTime, long phaseDelayDuration, long increasingAlphaDuration, long increasingAlphaRampDuration, long alphaAtOneDuration)</CODE><BR> Constructs a new Alpha object that assumes that the mode is INCREASING_ENABLE.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#finished()">finished</A></B>()</CODE><BR> Query to test if this alpha object is past its activity window, that is, if it has finished looping.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getAlphaAtOneDuration()">getAlphaAtOneDuration</A></B>()</CODE><BR> Retrieves this alpha's alphaAtOneDuration.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getAlphaAtZeroDuration()">getAlphaAtZeroDuration</A></B>()</CODE><BR> Retrieves this alpha's alphaAtZeroDuration.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getDecreasingAlphaDuration()">getDecreasingAlphaDuration</A></B>()</CODE><BR> Retrieves this alpha's decreasingAlphaDuration.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getDecreasingAlphaRampDuration()">getDecreasingAlphaRampDuration</A></B>()</CODE><BR> Retrieves this alpha's decreasingAlphaRampDuration.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getIncreasingAlphaDuration()">getIncreasingAlphaDuration</A></B>()</CODE><BR> Retrieves this alpha's increasingAlphaDuration.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getIncreasingAlphaRampDuration()">getIncreasingAlphaRampDuration</A></B>()</CODE><BR> Retrieves this alpha's increasingAlphaRampDuration.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/Alpha.html#getLoopCount()">getLoopCount</A></B>()</CODE>⌨️ 快捷键说明
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