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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h1>Wt::WVirtualImage Class Reference</h1><!-- doxytag: class="Wt::WVirtualImage" --><!-- doxytag: inherits="Wt::WCompositeWidget" -->An abstract widget that shows a viewport to a virtually large image.
<a href="#_details">More...</a>
<p>
<code>#include <Wt/WVirtualImage></code>
<p>
<div class="dynheader">
Inheritance diagram for Wt::WVirtualImage:</div>
<div class="dynsection">
<p><center><img src="classWt_1_1WVirtualImage__inherit__graph.png" border="0" usemap="#Wt_1_1WVirtualImage__inherit__map" alt="Inheritance graph"></center>
<map name="Wt_1_1WVirtualImage__inherit__map">
<area shape="rect" href="classWt_1_1WCompositeWidget.html" title="A widget that hides the implementation of composite widgets." alt="" coords="5,155,165,181"><area shape="rect" href="classWt_1_1WWidget.html" title="The abstract base class for a user-interface component." alt="" coords="37,80,133,107"><area shape="rect" href="classWt_1_1WObject.html" title="A base class for objects that participate in the signal/slot system." alt="" coords="37,5,133,32"></map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center></div>
<p>
<a href="classWt_1_1WVirtualImage-members.html">List of all members.</a><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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#a7d567e1fb9f81bb00b0e4c5364c2281">WVirtualImage</a> (int viewPortWidth, int viewPortHeight, int64_t imageWidth, int64_t imageHeight, int gridImageSize=256, <a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> *parent=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a viewport for a virtual image. <a href="#a7d567e1fb9f81bb00b0e4c5364c2281"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e579c6380dddbc8a6390344e21c5e8bd"></a><!-- doxytag: member="Wt::WVirtualImage::~WVirtualImage" ref="e579c6380dddbc8a6390344e21c5e8bd" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#e579c6380dddbc8a6390344e21c5e8bd">~WVirtualImage</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#c77880df77641e2778667d89135bd8c5">redrawAll</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Regenerates and redraws the image pieces. <a href="#c77880df77641e2778667d89135bd8c5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#967961b3744ce70b0dcfffd2dd4e5582">enableDragging</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Enables mouse dragging to scroll around the image. <a href="#967961b3744ce70b0dcfffd2dd4e5582"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#534e108756601d90729613531eb8b53c">scroll</a> (int64_t dx, int64_t dy)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Scrolls the viewport of the image over a distance. <a href="#534e108756601d90729613531eb8b53c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#5d3c1ed4db8ae1022e6810ebf2b96002">scrollTo</a> (int64_t x, int64_t y)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Scrolls the viewport of the image to a specific coordinate. <a href="#5d3c1ed4db8ae1022e6810ebf2b96002"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#a1468c9e6f1903c6120f207a017ee07b">imageWidth</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the virtual image width. <a href="#a1468c9e6f1903c6120f207a017ee07b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#498aa2ad488ad7a8aefc452dc1ac7073">imageHeight</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the virtual image height. <a href="#498aa2ad488ad7a8aefc452dc1ac7073"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#269a9169c21d4b5337ca1ffca3818a7d">resizeImage</a> (int64_t w, int64_t h)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Resizes the virtual image. <a href="#269a9169c21d4b5337ca1ffca3818a7d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#b2820de18d8a323c53b1cc7a7cf09486">viewPortWidth</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the viewport width. <a href="#b2820de18d8a323c53b1cc7a7cf09486"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#31e6291cbafcd176aa55e43d5b9fa9c6">viewPortHeight</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the viewport height. <a href="#31e6291cbafcd176aa55e43d5b9fa9c6"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#4a222f67c8e0b285f4a0f5fb646ef09a">gridImageSize</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the size of a single piece. <a href="#4a222f67c8e0b285f4a0f5fb646ef09a"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#cebb4e525040bc0007a8de4a468edd53">currentTopLeftX</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the current top left X coordinate. <a href="#cebb4e525040bc0007a8de4a468edd53"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#af21415766c90bb5fca7467f2e1c2290">currentTopLeftY</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the current top left Y coordinate. <a href="#af21415766c90bb5fca7467f2e1c2290"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#70f6115b0cadd44f5401f588207a559a">currentBottomRightX</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the current bottom right X coordinate. <a href="#70f6115b0cadd44f5401f588207a559a"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#1bad3a30a98028ad1bff4f124dd75045">currentBottomRightY</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the current bottom right Y coordinate. <a href="#1bad3a30a98028ad1bff4f124dd75045"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classWt_1_1Signal.html">Signal</a>< int64_t, int64_t > & </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#f9ee8a45d64065925e0fcaa4d15be5d5">viewPortChanged</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Signal emitted whenever the viewport changes. <a href="#f9ee8a45d64065925e0fcaa4d15be5d5"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Static Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="31301991419831c28727146799c6177f"></a><!-- doxytag: member="Wt::WVirtualImage::Infinite" ref="31301991419831c28727146799c6177f" args="" -->
static const int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#31301991419831c28727146799c6177f">Infinite</a> = std::numeric_limits<int64_t>::max()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Special value for imageWidth or imageHeight. <br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WImage.html">WImage</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#d77db89c2208a50f7a29f3429db60abe">createImage</a> (int64_t x, int64_t y, int width, int height)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Creates a grid image for the given rectangle. <a href="#d77db89c2208a50f7a29f3429db60abe"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual <a class="el" href="classWt_1_1WResource.html">WResource</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classWt_1_1WVirtualImage.html#96f487768bcb1292304843a4a05a7daa">render</a> (int64_t x, int64_t y, int width, int height)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Render a grid image for the given rectangle. <a href="#96f487768bcb1292304843a4a05a7daa"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
An abstract widget that shows a viewport to a virtually large image.
<p>
WVirtualImage is an abstract class which renders a large image in small pieces. The large image is broken down, and rendered as a grid of smaller square images parts.<p>
The WVirtualImage may provide interactive navigation using the mouse, by reacting to dragging of the mouse on the image.<p>
The WVirtualImage renders pieces in and bordering the current viewport. In this way, provided the individual pieces load sufficiently fast, the user has effectively the impression of scrolling through a single large image, without glitches. Whenever the image is navigated, if necessary, new images are rendered to maintain the border. Images that are too far from the current viewport are pruned away, so that browser memory remains bounded.<p>
To use this class, you must reimplement one of two virtual methods to specify the contents of each grid piece. Either you provide a suitable <a class="el" href="classWt_1_1WImage.html" title="A widget that displays an image.">WImage</a> for every grid piece, or you provide a <a class="el" href="classWt_1_1WResource.html" title="An object which can be rendered in the HTTP protocol.">WResource</a> which renders the contents for a <a class="el" href="classWt_1_1WImage.html" title="A widget that displays an image.">WImage</a> for every grid piece.<p>
The total image dimensions are (0, 0) to (imageWidth, imageHeight) for a finite image, and become unbounded (including negative numbers) for each dimension which is Infinite.<p>
<h3>CSS</h3>
<p>
Styling through CSS is not applicable. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a7d567e1fb9f81bb00b0e4c5364c2281"></a><!-- doxytag: member="Wt::WVirtualImage::WVirtualImage" ref="a7d567e1fb9f81bb00b0e4c5364c2281" args="(int viewPortWidth, int viewPortHeight, int64_t imageWidth, int64_t imageHeight, int gridImageSize=256, WContainerWidget *parent=0)" -->
<div class="memitem">
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<td class="memname">Wt::WVirtualImage::WVirtualImage </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>viewPortWidth</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>viewPortHeight</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>imageWidth</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int64_t </td>
<td class="paramname"> <em>imageHeight</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>gridImageSize</em> = <code>256</code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classWt_1_1WContainerWidget.html">WContainerWidget</a> * </td>
<td class="paramname"> <em>parent</em> = <code>0</code></td><td> </td>
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<td>)</td>
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<div class="memdoc">
<p>
Creates a viewport for a virtual image.
<p>
You must specify the size of the viewport, and the size of the virtual image. The latter dimensions may be the special value Infinite, indicating that in one or more dimensions, the image size is infinite (in practice limited by the maximum integer value).<p>
In addition, you must specify the size of each square grid item. The default is 256 by 256.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="c77880df77641e2778667d89135bd8c5"></a><!-- doxytag: member="Wt::WVirtualImage::redrawAll" ref="c77880df77641e2778667d89135bd8c5" args="()" -->
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<td class="memname">void Wt::WVirtualImage::redrawAll </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
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<div class="memdoc">
<p>
Regenerates and redraws the image pieces.
<p>
This method invalidates all current grid images, and recreates them.
</div>
</div><p>
<a class="anchor" name="967961b3744ce70b0dcfffd2dd4e5582"></a><!-- doxytag: member="Wt::WVirtualImage::enableDragging" ref="967961b3744ce70b0dcfffd2dd4e5582" args="()" -->
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<td class="memname">void Wt::WVirtualImage::enableDragging </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
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<div class="memdoc">
<p>
Enables mouse dragging to scroll around the image.
<p>
The cursor is changed to a 'move' symbol to indicate the interactivity.
</div>
</div><p>
<a class="anchor" name="534e108756601d90729613531eb8b53c"></a><!-- doxytag: member="Wt::WVirtualImage::scroll" ref="534e108756601d90729613531eb8b53c" args="(int64_t dx, int64_t dy)" -->
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<td class="memname">void Wt::WVirtualImage::scroll </td>
<td>(</td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>dx</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>dy</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<div class="memdoc">
<p>
Scrolls the viewport of the image over a distance.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#5d3c1ed4db8ae1022e6810ebf2b96002" title="Scrolls the viewport of the image to a specific coordinate.">scrollTo()</a> </dd></dl>
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</div><p>
<a class="anchor" name="5d3c1ed4db8ae1022e6810ebf2b96002"></a><!-- doxytag: member="Wt::WVirtualImage::scrollTo" ref="5d3c1ed4db8ae1022e6810ebf2b96002" args="(int64_t x, int64_t y)" -->
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<td class="memname">void Wt::WVirtualImage::scrollTo </td>
<td>(</td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>x</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>y</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
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<div class="memdoc">
<p>
Scrolls the viewport of the image to a specific coordinate.
<p>
Scroll the viewport so that its top left coordinate becomes (x, y).<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#534e108756601d90729613531eb8b53c" title="Scrolls the viewport of the image over a distance.">scroll()</a> </dd></dl>
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</div><p>
<a class="anchor" name="a1468c9e6f1903c6120f207a017ee07b"></a><!-- doxytag: member="Wt::WVirtualImage::imageWidth" ref="a1468c9e6f1903c6120f207a017ee07b" args="() const " -->
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<td class="memname">int64_t Wt::WVirtualImage::imageWidth </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
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<div class="memdoc">
<p>
Returns the virtual image width.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#498aa2ad488ad7a8aefc452dc1ac7073" title="Returns the virtual image height.">imageHeight()</a>, <a class="el" href="classWt_1_1WVirtualImage.html#269a9169c21d4b5337ca1ffca3818a7d" title="Resizes the virtual image.">resizeImage()</a> </dd></dl>
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<a class="anchor" name="498aa2ad488ad7a8aefc452dc1ac7073"></a><!-- doxytag: member="Wt::WVirtualImage::imageHeight" ref="498aa2ad488ad7a8aefc452dc1ac7073" args="() const " -->
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<td class="memname">int64_t Wt::WVirtualImage::imageHeight </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
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<div class="memdoc">
<p>
Returns the virtual image height.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#a1468c9e6f1903c6120f207a017ee07b" title="Returns the virtual image width.">imageWidth()</a>, <a class="el" href="classWt_1_1WVirtualImage.html#269a9169c21d4b5337ca1ffca3818a7d" title="Resizes the virtual image.">resizeImage()</a> </dd></dl>
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</div><p>
<a class="anchor" name="269a9169c21d4b5337ca1ffca3818a7d"></a><!-- doxytag: member="Wt::WVirtualImage::resizeImage" ref="269a9169c21d4b5337ca1ffca3818a7d" args="(int64_t w, int64_t h)" -->
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<td class="memname">void Wt::WVirtualImage::resizeImage </td>
<td>(</td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>w</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>h</em></td><td> </td>
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<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
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</table>
</div>
<div class="memdoc">
<p>
Resizes the virtual image.
<p>
This sets a new virtual size for the image. The viewport size sets the visible portion of the image.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#a1468c9e6f1903c6120f207a017ee07b" title="Returns the virtual image width.">imageWidth()</a>, <a class="el" href="classWt_1_1WVirtualImage.html#498aa2ad488ad7a8aefc452dc1ac7073" title="Returns the virtual image height.">imageHeight()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="b2820de18d8a323c53b1cc7a7cf09486"></a><!-- doxytag: member="Wt::WVirtualImage::viewPortWidth" ref="b2820de18d8a323c53b1cc7a7cf09486" args="() const " -->
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<td class="memname">int Wt::WVirtualImage::viewPortWidth </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Returns the viewport width.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#31e6291cbafcd176aa55e43d5b9fa9c6" title="Returns the viewport height.">viewPortHeight()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="31e6291cbafcd176aa55e43d5b9fa9c6"></a><!-- doxytag: member="Wt::WVirtualImage::viewPortHeight" ref="31e6291cbafcd176aa55e43d5b9fa9c6" args="() const " -->
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<td class="memname">int Wt::WVirtualImage::viewPortHeight </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
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<div class="memdoc">
<p>
Returns the viewport height.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#b2820de18d8a323c53b1cc7a7cf09486" title="Returns the viewport width.">viewPortWidth()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="4a222f67c8e0b285f4a0f5fb646ef09a"></a><!-- doxytag: member="Wt::WVirtualImage::gridImageSize" ref="4a222f67c8e0b285f4a0f5fb646ef09a" args="() const " -->
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<td class="memname">int Wt::WVirtualImage::gridImageSize </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Returns the size of a single piece.
<p>
This is the size of a side of the square pieces that is used to render the visible part of the image.
</div>
</div><p>
<a class="anchor" name="cebb4e525040bc0007a8de4a468edd53"></a><!-- doxytag: member="Wt::WVirtualImage::currentTopLeftX" ref="cebb4e525040bc0007a8de4a468edd53" args="() const " -->
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<td class="memname">int64_t Wt::WVirtualImage::currentTopLeftX </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Returns the current top left X coordinate.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#af21415766c90bb5fca7467f2e1c2290" title="Returns the current top left Y coordinate.">currentTopLeftY()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="af21415766c90bb5fca7467f2e1c2290"></a><!-- doxytag: member="Wt::WVirtualImage::currentTopLeftY" ref="af21415766c90bb5fca7467f2e1c2290" args="() const " -->
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<td class="memname">int64_t Wt::WVirtualImage::currentTopLeftY </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Returns the current top left Y coordinate.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#cebb4e525040bc0007a8de4a468edd53" title="Returns the current top left X coordinate.">currentTopLeftX()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="70f6115b0cadd44f5401f588207a559a"></a><!-- doxytag: member="Wt::WVirtualImage::currentBottomRightX" ref="70f6115b0cadd44f5401f588207a559a" args="() const " -->
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<td class="memname">int64_t Wt::WVirtualImage::currentBottomRightX </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Returns the current bottom right X coordinate.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#1bad3a30a98028ad1bff4f124dd75045" title="Returns the current bottom right Y coordinate.">currentBottomRightY()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="1bad3a30a98028ad1bff4f124dd75045"></a><!-- doxytag: member="Wt::WVirtualImage::currentBottomRightY" ref="1bad3a30a98028ad1bff4f124dd75045" args="() const " -->
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<td class="memname">int64_t Wt::WVirtualImage::currentBottomRightY </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Returns the current bottom right Y coordinate.
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#70f6115b0cadd44f5401f588207a559a" title="Returns the current bottom right X coordinate.">currentBottomRightX()</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="f9ee8a45d64065925e0fcaa4d15be5d5"></a><!-- doxytag: member="Wt::WVirtualImage::viewPortChanged" ref="f9ee8a45d64065925e0fcaa4d15be5d5" args="()" -->
<div class="memitem">
<div class="memproto">
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<td class="memname"><a class="el" href="classWt_1_1Signal.html">Signal</a><int64_t, int64_t>& Wt::WVirtualImage::viewPortChanged </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td><code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Signal emitted whenever the viewport changes.
<p>
The viewport can be changed by the user dragging the image or through the API methods <a class="el" href="classWt_1_1WVirtualImage.html#5d3c1ed4db8ae1022e6810ebf2b96002" title="Scrolls the viewport of the image to a specific coordinate.">scrollTo()</a> and <a class="el" href="classWt_1_1WVirtualImage.html#534e108756601d90729613531eb8b53c" title="Scrolls the viewport of the image over a distance.">scroll()</a>.
</div>
</div><p>
<a class="anchor" name="d77db89c2208a50f7a29f3429db60abe"></a><!-- doxytag: member="Wt::WVirtualImage::createImage" ref="d77db89c2208a50f7a29f3429db60abe" args="(int64_t x, int64_t y, int width, int height)" -->
<div class="memitem">
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<td class="memname"><a class="el" href="classWt_1_1WImage.html">WImage</a> * Wt::WVirtualImage::createImage </td>
<td>(</td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>x</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>y</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>width</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>height</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Creates a grid image for the given rectangle.
<p>
Create the image which spans image coordinates with left upper corner (x, y) and given width and height.<p>
Width and height will not necesarilly equal <a class="el" href="classWt_1_1WVirtualImage.html#4a222f67c8e0b285f4a0f5fb646ef09a" title="Returns the size of a single piece.">gridImageSize()</a>, if the the image is not infinite sized.<p>
The default implementation calls <a class="el" href="classWt_1_1WVirtualImage.html#96f487768bcb1292304843a4a05a7daa" title="Render a grid image for the given rectangle.">render()</a> and creates an image for the resource returned.<p>
You should override this method if you wish to serve for example static image content.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#96f487768bcb1292304843a4a05a7daa" title="Render a grid image for the given rectangle.">render(int64_t x, int64_t y, int width, int height)</a> </dd></dl>
</div>
</div><p>
<a class="anchor" name="96f487768bcb1292304843a4a05a7daa"></a><!-- doxytag: member="Wt::WVirtualImage::render" ref="96f487768bcb1292304843a4a05a7daa" args="(int64_t x, int64_t y, int width, int height)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classWt_1_1WResource.html">WResource</a> * Wt::WVirtualImage::render </td>
<td>(</td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>x</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int64_t </td>
<td class="paramname"> <em>y</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>width</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>height</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Render a grid image for the given rectangle.
<p>
Returns a resource that streams an image which renders the rectangle which spans image coordinates with left upper corner (x, y) and given width and height.<p>
Width and height will not necesarilly equal to <a class="el" href="classWt_1_1WVirtualImage.html#4a222f67c8e0b285f4a0f5fb646ef09a" title="Returns the size of a single piece.">gridImageSize()</a>, if the the image is not infinite sized.<p>
The default implementation throws an Exception. You must reimplement this method unless you reimplement <a class="el" href="classWt_1_1WVirtualImage.html#d77db89c2208a50f7a29f3429db60abe" title="Creates a grid image for the given rectangle.">createImage()</a>.<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="classWt_1_1WVirtualImage.html#d77db89c2208a50f7a29f3429db60abe" title="Creates a grid image for the given rectangle.">createImage(int64_t x, int64_t y, int width, int height)</a> </dd></dl>
</div>
</div><p>
</div>
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