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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>vtlib library: vtTrackball Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.5 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li id="current"><a href="annotated.html"><span>Classes</span></a></li> <li><a href="dirs.html"><span>Directories</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>vtTrackball Class Reference<br><small>[<a class="el" href="group__nav.html">Navigation</a>]</small></h1><!-- doxytag: class="vtTrackball" --><!-- doxytag: inherits="vtLastMouse" -->Inheritance diagram for vtTrackball:<p><center><img src="classvtTrackball__inherit__graph.png" border="0" usemap="#vtTrackball__inherit__map" alt="Inheritance graph"></center><map name="vtTrackball__inherit__map"><area href="classvtLastMouse.html" shape="rect" coords="13,156,112,183" alt=""><area href="classvtEngine.html" shape="rect" coords="25,81,100,108" alt=""><area href="classvtEnabledBase.html" shape="rect" coords="7,7,119,33" alt=""></map><center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classvtTrackball-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>A Trackball is a navigation engine which can move a Camera (or any other Transform target) and move it around a center point based on mouse input.<p>You can set which combinations of mouse buttons and modifier keys will rotate, zoom and translate the target. The default is:<ul><li>Middle button: Rotate.</li><li>Middle button with shift key: Zoom. </li></ul><p><table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#f30385c663591415a65c2d26af2aa1c5">SetRadius</a> (float fRadius)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">float </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#8a85e03d39b2102f95098034e4b79976">GetRadius</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#7ee60f3f6b4bf83ee12d58ba796e69c8">SetRotateButton</a> (int button, int modifier=0, bool bExact=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#e5dbceb3c520834f64dcf6e477235c13">SetZoomButton</a> (int button, int modifier=0, bool bExact=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#1573fd5b8b532b3aa5e4273a225eac80">SetTranslateButton</a> (int button, int modifier=0, bool bExact=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#4feff6eb34798278d7beb2cc789b3bd5">SetZoomScale</a> (float s)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#d8da782d2c2adf11467c2a32277181ec">SetRotScale</a> (float s)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#5708f8b0e5983b65890c11dfc26892f2">SetTransScale</a> (float s)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#58296e4e56876b63e82cace0d731307b">SetDirection</a> (float fTheta, float fPhi)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#fafaef7228c43c07d10e0f8a61629822">MoveDirection</a> (float fTheta, float fPhi)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e407bf9716154afc56361451c5f2217d"></a><!-- doxytag: member="vtTrackball::OnMouse" ref="e407bf9716154afc56361451c5f2217d" args="(vtMouseEvent &event)" -->void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#e407bf9716154afc56361451c5f2217d">OnMouse</a> (<a class="el" href="structvtMouseEvent.html">vtMouseEvent</a> &event)</td></tr><tr><td class="mdescLeft"> </td><td class="mdescRight">Virtual handler, to catch mouse events, can be overridden by your engine class. <br></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classvtTrackball.html#11732384f35d882f068fe5920d53099d">Eval</a> ()</td></tr></table><hr><h2>Member Function Documentation</h2><a class="anchor" name="11732384f35d882f068fe5920d53099d"></a><!-- doxytag: member="vtTrackball::Eval" ref="11732384f35d882f068fe5920d53099d" args="()" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void vtTrackball::Eval </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Virtual handler, will be called every frame to do the work of the engine. You must override this if you want your engine to be useful. <p>Reimplemented from <a class="el" href="classvtEngine.html#11732384f35d882f068fe5920d53099d">vtEngine</a>. </td> </tr></table><a class="anchor" name="8a85e03d39b2102f95098034e4b79976"></a><!-- doxytag: member="vtTrackball::GetRadius" ref="8a85e03d39b2102f95098034e4b79976" args="() const " --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">float vtTrackball::GetRadius </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap> const</td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Get the radius, the distance from the pivot point that the Trackball rotates around. </td> </tr></table><a class="anchor" name="fafaef7228c43c07d10e0f8a61629822"></a><!-- doxytag: member="vtTrackball::MoveDirection" ref="fafaef7228c43c07d10e0f8a61629822" args="(float fTheta, float fPhi)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void vtTrackball::MoveDirection </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">float </td> <td class="mdname" nowrap> <em>fTheta</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float </td> <td class="mdname" nowrap> <em>fPhi</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Shift the direction the trackball is facing, by a given offset.<p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>fTheta,fPhi</em> </td><td>Polar coordinates for the target relative to the pivot point. </td></tr> </table></dl> </td> </tr></table><a class="anchor" name="58296e4e56876b63e82cace0d731307b"></a><!-- doxytag: member="vtTrackball::SetDirection" ref="58296e4e56876b63e82cace0d731307b" args="(float fTheta, float fPhi)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void vtTrackball::SetDirection </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">float </td> <td class="mdname" nowrap> <em>fTheta</em>, </td> </tr> <tr> <td class="md" nowrap align="right"></td> <td class="md"></td> <td class="md" nowrap>float </td> <td class="mdname" nowrap> <em>fPhi</em></td> </tr> <tr> <td class="md"></td> <td class="md">) </td> <td class="md" colspan="2"></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Set the direction the trackball is facing.<p><dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>fTheta,fPhi</em> </td><td>Polar coordinates for the target relative to the pivot point. </td></tr> </table></dl> </td> </tr></table><a class="anchor" name="f30385c663591415a65c2d26af2aa1c5"></a><!-- doxytag: member="vtTrackball::SetRadius" ref="f30385c663591415a65c2d26af2aa1c5" args="(float fRadius)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void vtTrackball::SetRadius </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">float </td> <td class="mdname1" valign="top" nowrap> <em>fRadius</em> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Set the radius, the distance from the pivot point that the Trackball rotates around. </td> </tr></table><a class="anchor" name="7ee60f3f6b4bf83ee12d58ba796e69c8"></a><!-- doxytag: member="vtTrackball::SetRotateButton" ref="7ee60f3f6b4bf83ee12d58ba796e69c8" args="(int button, int modifier=0, bool bExact=true)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow">⌨️ 快捷键说明
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