<?xml version="1.0" ?>
<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
<!ENTITY palapeli "<application>Palapeli</application>">
<!ENTITY psc "<application>Palapeli Slicer Collection</application>">
<!ENTITY kappname "&palapeli;">
<!ENTITY package "kdegames">
<!ENTITY % English "INCLUDE">
<!ENTITY % addindex "IGNORE">
]>

<book id="palapeli" lang="&language;">
	<bookinfo>
		<title>The &palapeli; Handbook</title>
		<authorgroup>
			<author>
				<firstname>Johannes</firstname>
				<surname>L&#xF6;hnert</surname>
				<affiliation><address><email>loehnert_kde@gmx.de</email></address></affiliation>
			</author>
			<author>
				<firstname>Stefan</firstname>
				<surname>Majewsky</surname>
				<affiliation><address><email>majewsky@gmx.net</email></address></affiliation>
			</author>
			<!-- TRANS:ROLES_OF_TRANSLATORS -->
		</authorgroup>

		<copyright>
			<year>2009, 2010</year>
			<holder>Johannes L&#xF6;hnert, Stefan Majewsky</holder>
		</copyright>
		<legalnotice>&FDLNotice;</legalnotice>
		<date>2014-02-18</date>
		<releaseinfo>2.0 (&kde; 4.13)</releaseinfo>

		<abstract>
			<para>This is the manual for &palapeli;, a jigsaw puzzle game based on &kde; technology.</para>
		</abstract>
		<keywordset>
			<keyword>KDE</keyword>
			<keyword>kdegames</keyword>
			<keyword>game</keyword>
			<keyword>puzzle game</keyword>
			<keyword>jigsaw puzzle</keyword>
			<keyword>palapeli</keyword>
		</keywordset>
	</bookinfo>

	<chapter id="introduction">
		<title>Introduction</title>
		<para>&palapeli; is a single-player jigsaw puzzle game.</para>
		<para>The &palapeli; window is separated into two areas, the puzzle collection and the puzzle table. This manual will now continue with describing these two areas.</para>
	</chapter>

	<chapter id="collection">
		<title>Browsing the puzzle collection</title>
		<para>When you launch &palapeli; for the first time, your puzzle collection is preloaded with some default puzzles that come with &palapeli;. Click on one of the puzzles to immediately start playing. Playing takes place on the puzzle table; see <link linkend="puzzletable">the section after next</link> for how to use the puzzle table.</para>
		<para>Apart from selecting a puzzle, the puzzle collection can be used for the following actions:</para>
		<itemizedlist>
			<listitem><para><emphasis>create</emphasis> new puzzles from images on your disk</para></listitem>
			<listitem><para><emphasis>import</emphasis> puzzles made by others</para></listitem>
			<listitem><para><emphasis>export</emphasis> puzzles to share them with your friends and the world</para></listitem>
			<listitem><para><emphasis>delete</emphasis> puzzles you do not need any more</para></listitem>
		</itemizedlist>
		<para>The following section shows how to perform these tasks with the toolbar buttons.</para>
		<sect1 id="toolbars-collection">
			<title>Toolbar overview</title>
			<note><para>You can select puzzles in the puzzle list by pressing &Ctrl; and &LMB; together. Pressing the &LMB; or &RMB; without &Ctrl; opens the specific puzzle in the puzzle table.</para></note>
			<variablelist>
				<varlistentry>
					<term><guiicon>Create new puzzle</guiicon></term>
					<listitem>
						<para><action>Opens a dialog which allows you to create a puzzle from an image on your disk.</action> See <link linkend="create-puzzles">the next section</link> for details.</para>
					</listitem>
				</varlistentry>
				<varlistentry>
					<term><guiicon>Delete puzzle</guiicon></term>
					<listitem><para><action>Any puzzles that you have selected in the puzzle list, will be permanently deleted from your library. </action></para><warning><para>This action cannot be undone.</para></warning></listitem>
				</varlistentry>
				<varlistentry>
					<term><guiicon>Import from file</guiicon></term>
					<listitem><para><action>When you have received a &palapeli; puzzle file (which can usually be recognized by the file extension <literal role="extension">*.puzzle</literal>), you can use this action to import it into your local collection.</action> Puzzle files can also be played by simply clicking on them in the file manager of your choice, but after the import, the puzzle will appear in your local collection, and you can safely delete the downloaded puzzle file.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><guiicon>Export to file</guiicon></term>
					<listitem><para><action>This will export the currently selected puzzles to files, in order to enable you to give them to your friends, publish them on the web, or make backup copies of your collection.</action></para></listitem>
				</varlistentry>
			</variablelist>
		</sect1>
	</chapter>

	<chapter id="create-puzzles">
		<title>Creating new puzzles</title>
		<para>As described in <link linkend="collection">the previous section</link>, you can create new puzzles by clicking on the <guiicon>Create new puzzle</guiicon> button on the puzzle collection.</para>
		<para>Clicking this button opens the puzzle creation dialog, which consists of three pages:</para>
		<procedure>
			<step><para>On the first page, select an image file which shall be sliced into pieces. Be sure to enter the correct metadata for the image: You should give attribution to the author of the image (&eg; the photographer or the painter); please respect the copyright of the image author.</para></step>
			<step><para>On the second page, you can select the type of pieces into which the image shall be sliced. &palapeli; comes with a collection of slicers preinstalled, but third-party slicers may also be available.</para></step>
			<step><para>On the final page of the dialog, the selected slicer can be customized &eg; by choosing a different piece count or by adjusting parameters of the piece shape. The available set of options depends which slicer has been selected.</para></step>
		</procedure>
		<para>This manual will continue to discuss the slicers which come with &palapeli;. If you have downloaded a third-party slicer plugin for &palapeli;, please refer to the documentation of this plugin if you have trouble installing or using it on your system.</para>
		<sect1 id="psc">
			<title>&psc;</title>
			<para>The &psc; produces realistical jigsaw pieces with various basic patterns:</para>
			<variablelist>
				<varlistentry>
					<term>Rectangular grid</term>
					<listitem><para>Contains the well-known rectangular pieces.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Cairo grid</term>
					<listitem><para>With its pentagonal pieces and unequal edge angles, it's rather hard to puzzle because the pieces fit together in an unfamiliar manner.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Hexagonal grid</term>
					<listitem><para>Produces hexagonal pieces, arranged like honeycomb cells.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Rotrex grid</term>
					<listitem><para>Through a special composition of triangular, hexagonal and rectangular pieces, the pieces form a pattern resembling to many intersecting circles.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Irregular grid</term>
					<listitem><para>This grid is available only if you have installed <application>qvoronoi</application> from the <ulink url="http://www.qhull.org"><application>qhull</application> package</ulink>. <application>qvoronoi</application> is used to calculate irregular piece shapes from randomly placed points.</para></listitem>
				</varlistentry>
			</variablelist>
			<para>The &psc; has various parameters which control the appearance of the piece edges, especially the plugs on them. Default settings are provided for all of these parameters. An additional preset mode is available which reduces the amount of parameters to a bare minimum. The following parameters are available usually:</para>
			<variablelist>
				<varlistentry>
					<term>Approx. piece count</term>
					<listitem><para></para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Flipped edge percentage</term>
					<listitem><para>The probability for each plug to be flipped. A plug is considered flipped if it points in the opposite direction as it would in a fully regular grid. On the rectangular grid, this results in pieces with 3 or 4 plugs pointing inwards resp. outwards. Position the slider at the very left to obtain the normal fully regular grid. In the middle, plug orientation is random. At the right, the grid is fully regular again, but with an "alternate" rule. This does <emphasis>not</emphasis> mean reversal of all plugs: In the alternate regular grid, for instance, each piece has four inward-pointing or four outward-pointing plugs. This setting has no effect in the irregular grid.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Edge curviness</term>
					<listitem><para>Determines how curvy the edges are, &ie; how strongly the borders dent in or bulge out. Move the slider to the very left to obtain straight edge lines (except for the plugs).</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Plug size</term>
					<listitem><para>Determines the size of the plug part of each edge. The default setting (middle position of the slider) is chosen to look like a real puzzle. The slider ranges from 50% to 150% this size, which already looks obscenely large. The program tries very hard to avoid collisions between plugs. Colliding edges are reshaped multiple times and shrinked in small steps. However there still remain cases where no solution can be found, especially for large plug sizes.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Diversity of curviness</term>
					<listitem><para>Determines how much the curviness (see above) varies between edges. Move the slider to the left to make the dents and bulges look all the same. At the right, there may occur very curvy and very straight borders.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Diversity of plug position</term>
					<listitem><para>Determines how much the position of the plug on the edge varies. At the very left, plugs are affixed to the middle of their edge.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Diversity of plugs</term>
					<listitem><para>Determines how individual the plugs look like. At the very left, plugs look all the same. At the very right, each plug will be a unique piece of art crafted especially for you.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Irr.: Diversity of piece size</term>
					<listitem><para>Only for irregular grid: Determines how the piece size varies. A very small setting means nearly no variation; crystallite-like structure arise. Higher settings produce very small and very large pieces.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term>Dump grid image</term>
					<listitem><para>Save an image of the grid (black edges on white background) at <filename>~/goldberg-slicer-dump.png</filename>. If a previous dump exists, it is overwritten.</para></listitem>
				</varlistentry>
			</variablelist>
		</sect1>
		<sect1 id="legacy-slicers">
			<title>Legacy slicers</title>
			<para>For historical reasons, &palapeli; also includes the slicers &quot;Classic jigsaw pieces&quot; and &quot;Rectangular pieces&quot;. These slicers create simple rectangular pieces either with or without connecting plugs. Both slicers allow the piece count and the aspect ratio to be adjusted. Dragging the aspect ratio slider to the left results in tall pieces, adjusting it to the right produces wide pieces. The default selection produces approximately square pieces.</para>
		</sect1>
	</chapter>

	<chapter id="puzzletable">
		<title>Playing on the puzzle table</title>
		<screenshot><mediaobject>
			<imageobject><imagedata fileref="puzzletable1.png" format="PNG"/></imageobject>
			<textobject><phrase>The puzzle table (detail)</phrase></textobject>
		</mediaobject></screenshot>
		<para>The object of the game is to assemble the given pieces to an image.</para>
		<para>Pieces can be freely moved by clicking and dragging them with the &LMB;. You can select multiple pieces at once by holding &Ctrl; and clicking on them, or by dragging a rubberband around them with the &LMB;.</para>
		<para>When you put one piece near a neighboring piece, both pieces will automatically snap together (1). After having snapped together, pieces cannot be torn apart anymore. Unlike in reality, you cannot combine two pieces that are not true neighbors.</para>
		<para>The progress bar below the puzzle table indicates your progress (2). &palapeli; will automatically save your progress after every move, so you'll normally not have to bother about saving.</para>
		<para>With the mouse wheel, or with the slider at the bottom right (3), you can change the zoom level of the puzzle table view. By clicking and dragging with the &RMB;, you can move the puzzle table view.</para>
		<para>The movement of the pieces is limited by the <emphasis>puzzle table area</emphasis>. This area is represented on the puzzle table's background by a light rectangular shade. When you move pieces to the border (4) of the puzzle table area, the area will automatically expand to give you more space for moving your puzzle pieces. Near the shaded borders, the mouse cursor changes into a double-headed arrow, indicating that you can adjust the puzzle table area by clicking there and dragging with the &LMB;.</para>
		<para>You can lock the puzzle table area with the small button (5) right next to the progress bar. The shade (4) around the puzzle table will darken, and pieces will now stop to move at the edges of the puzzle table area. It is still possible to adjust the size of the puzzle table area manually.</para>
		<sect1 id="puzzletable-mouseactions">
			<title>Mouse interactions</title>
			<para>As described in the previous section, there are plenty of ways to interact with &palapeli;'s puzzle table using the mouse. You can configure freely which actions are triggered by which mouse buttons. (See <link linkend="configuration-mouseactions">Game Configuration</link> section for more information on how to configure this.) The following list summarizes all possible mouse actions:</para>
			<variablelist>
				<varlistentry>
					<term><action>Change size of puzzle table area by dragging its edges</action></term>
					<listitem><para>By default, this action is assigned to the &LMB;.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Move pieces by dragging</action></term>
					<listitem><para>When you click and drag a puzzle piece, this piece will be moved. If multiple pieces are selected and you click and drag one of these pieces, then all pieces are moved. By default, this action is assigned to the &LMB;.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Move viewport by dragging</action></term>
					<listitem><para>By default, this action is assigned to the &RMB;.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Select multiple pieces at once</action></term>
					<listitem><para>When you click on a free area of the puzzle table instead of a puzzle piece, you can drag a rubberband. When you let the mouse button go, all pieces inside the rubberband are selected. All other pieces are deselected. By default, this action is assigned to the &LMB;.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Select pieces by clicking</action></term>
					<listitem><para>When you click on a single puzzle piece, it will be selected. If it was already selected, it will be deselected. By default, this action is assigned to the &LMB; and only available when &Ctrl; is pressed.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Toggle lock state of the puzzle table area</action></term>
					<listitem><para>This action is identical to pressing the button (5) on the status bar. By default, this action is not assigned to any mouse button, but you can enable it from <link linkend="configuration-mouseactions">the configuration dialog</link>.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Scroll viewport horizontally</action> and <action>Scroll viewport vertically</action></term>
					<listitem><para>By default, this action is not assigned to the mouse wheel, but you can enable it from <link linkend="configuration-mouseactions">the configuration dialog</link>.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><action>Zoom viewport</action></term>
					<listitem><para>This action is identical to moving the slider (3) on the status bar. This action is assigned to the mouse wheel by default.</para></listitem>
				</varlistentry>
			</variablelist>
		</sect1>
		<sect1 id="toolbars-puzzletable">
			<title>Toolbar overview</title>
			<variablelist>
				<varlistentry>
					<term><guiicon>Back to collection</guiicon></term>
					<listitem><para><action>Go back to the collection to choose another puzzle.</action> Can be used only when you are solving a puzzle.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><guiicon>Preview</guiicon></term>
					<listitem><para><action>Toggle the display of the preview window with the completed puzzle.</action></para></listitem>
				</varlistentry>
			</variablelist>
		</sect1>
	</chapter>

	<chapter id="interface">
		<title>Interface Overview</title>
		<para>&palapeli;'s two areas, the puzzle collection and the puzzle table, are embedded into the menubar as tabs. There are also menus with standard actions which are described below.</para>
		<variablelist>
		        <varlistentry>
			  <term><menuchoice><shortcut><keycombo action="simul">&Ctrl;<keycap>N</keycap></keycombo></shortcut><guimenu>Game</guimenu><guimenuitem>Create new puzzle...</guimenuitem></menuchoice></term>
				<listitem><para><action>Opens a dialog which allows you to create a puzzle from an image on your disk.</action> See <link linkend="create-puzzles">the corresponding section</link> for details.</para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><guimenu>Game</guimenu><guimenuitem>Import from file...</guimenuitem></menuchoice></term>
				<listitem><para><action>When you have received a &palapeli; puzzle file (which can usually be recognized by the file extension <literal role="extension">*.puzzle</literal>), you can use this action to import it into your local collection.</action> Puzzle files can also be played by simply clicking on them in the file manager of your choice, but after the import, the puzzle will appear in your local collection, and you can safely delete the downloaded puzzle file.</para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><guimenu>Game</guimenu><guimenuitem>Export to file...</guimenuitem></menuchoice></term>
				<listitem><para><action>This will export the currently selected puzzles to files, in order to enable you to give them to your friends, publish them on the web, or make backup copies of your collection.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><guimenu>Game</guimenu><guimenuitem>Delete puzzle</guimenuitem></menuchoice></term>
				<listitem><para><action>Any puzzles that you have selected in the puzzle list, will be permanently deleted from your library.</action></para><warning><para>This action cannot be undone.</para></warning></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><guimenu>Game</guimenu><guimenuitem>Restart puzzle</guimenuitem></menuchoice></term>
				<listitem><para><action>Discards the saved progress for the current puzzle.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycap>C</keycap></shortcut><guimenu>Move</guimenu><guimenuitem>Create piece holder...</guimenuitem></menuchoice></term>
				<listitem><para><action>Create a temporary holder for sorting pieces.</action></para><para>To teleport selected pieces between holders press &Shift; and click with the &LMB;.</para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycap>D</keycap></shortcut><guimenu>Move</guimenu><guimenuitem>Delete piece holder</guimenuitem></menuchoice></term>
				<listitem><para><action>Delete a selected temporary holder when it is empty.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycap>A</keycap></shortcut><guimenu>Move</guimenu><guimenuitem>Select all in holder</guimenuitem></menuchoice></term>
				<listitem><para><action>Select all pieces in a selected piece holder.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycap>R</keycap></shortcut><guimenu>Move</guimenu><guimenuitem>Rearrange pieces</guimenuitem></menuchoice></term>
				<listitem><para><action>Rearrange all pieces in a selected piece holder or selected pieces in any 
window.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><guimenu>View</guimenu><guimenuitem>Back to collection</guimenuitem></menuchoice></term>
				<listitem><para><action>Go back to the collection to choose another puzzle.</action> Can be used only when you are solving a puzzle.</para></listitem>
			</varlistentry>

			<varlistentry>
				<term><menuchoice><guimenu>View</guimenu><guimenuitem>Preview</guimenuitem></menuchoice></term>
				<listitem><para><action>Toggle the display of the completed puzzle preview image.</action> Hover it with the mouse pointer to zoom in the image.</para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycap>Space</keycap></shortcut><guimenu>View</guimenu><guimenuitem>Close-up View</guimenuitem></menuchoice></term>
				<listitem><para><action>Toggle between close-up and distant view.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycombo action="simul">&Ctrl;<keycap>+</keycap></keycombo></shortcut><guimenu>View</guimenu><guimenuitem>Zoom In</guimenuitem></menuchoice></term>
				<listitem><para><action>Increase the scale by 20%.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><shortcut><keycombo action="simul">&Ctrl;<keycap>-</keycap></keycombo></shortcut><guimenu>View</guimenu><guimenuitem>Zoom Out</guimenuitem></menuchoice></term>
				<listitem><para><action>Decrease the scale by 20%.</action></para></listitem>
			</varlistentry>
			<varlistentry>
				<term><menuchoice><guimenu>Settings</guimenu><guimenuitem>Show statusbar of puzzle table</guimenuitem></menuchoice></term>
				<listitem><para><action>Toggle the display of the progress bar and buttons below the puzzle table.</action> This action will change nothing in the puzzle collection.</para></listitem>
			</varlistentry>
			<varlistentry id="settings-menu-configure">
				<term><menuchoice><guimenu>Settings</guimenu><guimenuitem>Configure &palapeli;...</guimenuitem></menuchoice></term>
				<listitem><para>Open a game configuration dialog. See <link linkend="configuration">Game Configuration</link> section for more details.</para>
				</listitem>
			</varlistentry>
		</variablelist>
		<para>
		  Additionally &palapeli; has the common &kde; <guimenu>Settings</guimenu> and <guimenu>Help</guimenu>
		  menu items, for more information read the sections about the <ulink url="help:/fundamentals/ui.html#menus-settings">Settings Menu</ulink> and <ulink url="help:/fundamentals/ui.html#menus-help">Help Menu</ulink> of the &kde; Fundamentals.
		</para>
	</chapter>

	<chapter id="configuration">
		<title>Game Configuration</title>
		<para>To open the configuration dialog, use the menubar option: <menuchoice><guimenu>Settings</guimenu><guimenuitem>Configure &palapeli;...</guimenuitem></menuchoice></para>
		<sect1 id="configuration-general">
			<title>General settings</title>
			<variablelist>
				<varlistentry>
				        <term><guilabel>Puzzle table</guilabel></term>
					<listitem>
					  <para>
					    Let you choose some parameters of the puzzle table.
					  </para>
					  <variablelist>
					<varlistentry>
					<term><guilabel>Background</guilabel></term>
					<listitem><para><action>Let you choose another background texture for the puzzle table.</action> If you choose a single color instead of a texture, the button besides the selection box can be used to define this single color.</para></listitem>
				      </varlistentry>
				      <varlistentry>
					<term><guilabel>Color for highlighting selected pieces</guilabel></term>
					<listitem><para><action>Let you choose highlighting color of the selected pieces.</action> Click on the button to the right of the label to open the <ulink url="help:/fundamentals/colors.html">Color Selector</ulink> window.</para></listitem>
				      </varlistentry>
				      <varlistentry>
					<term><guilabel>Spacing of pieces in puzzle grids (1.0-1.5)</guilabel></term>
					<listitem><para><action>Let you choose spacing in puzzle grids.</action> No space is provided with puzzles of less than 20 pieces. Changes will take effect when a puzzle is created or re-started.</para></listitem>
				      </varlistentry>
				    </variablelist>
				  </listitem>
				</varlistentry>
				<varlistentry>
					<term><guilabel>Piece appearance</guilabel></term>
					<listitem><para><action>Controls the appearance of pieces on the puzzle table.</action> If &palapeli; is running slowly, or when puzzles take very long to open, you can disable the graphical effects in this category to speed up everything.</para></listitem>
				</varlistentry>
				<varlistentry>
					<term><guilabel>Snapping precision</guilabel></term>
					<listitem><para><action>Let you choose how near neighbor pieces must be positioned to each other to snap together.</action> If you move the slider more to the right, pieces will snap together even if they are not so close. This makes the game a bit simpler to handle.</para></listitem>
				</varlistentry>
			</variablelist>
		</sect1>
		<sect1 id="configuration-mouseactions">
			<title>Mouse interaction</title>
			<para>This page of the configuration dialog allows you to assign the mouse interactions described in the section <link linkend="puzzletable-mouseactions">Playing on the puzzle table</link> to different mouse buttons. The interactions are divided into those that can be assigned to mouse buttons (&eg; <action>Move viewport by dragging</action>), and those that can be assigned to the mouse wheel (&eg; <action>Scroll viewport horizontally</action>).</para>
			<sect2>
				<title>Mouse buttons tab</title>
				<para>Next to the name of each interaction is a button with a picture of a computer mouse which shows the currently assigned action. You can configure the interaction by clicking on that button with the &LMB; and then with the mouse button which you want to assign to this interaction. If you hold modifier keys while clicking for the second time, the puzzle table will allow this interaction only while these modifiers are being held.</para>
				<tip><para>Instead of clicking, you can also press <keycap>Space</keycap> to assign the special <guilabel>No-Button</guilabel> to this interaction. This is only allowed if modifier keys are being held. The <guilabel>No-Button</guilabel> means that the modifier keys take the role of the mouse button: The interaction starts when the modifier keys are pressed, and stops when one of the modifier keys is released.</para></tip>
			</sect2>
			<sect2>
				<title>Mouse wheel tab</title>
				<para>This tab works similar to the previous one. When the button on the right asks for input, you have to turn the mouse wheel instead of clicking a mouse button. Holding modifier keys is allowed, too, with the same consequences as in the previous case.</para>
				<tip><para>If your mouse has a bidirectional mouse wheel (as most commonly found on notebook touchpads), you can take advantage of this: The button will recognize whether you turned the mouse wheel horizontally or vertically.</para></tip>
			</sect2>
		</sect1>
	</chapter>

	<chapter id="credits">
		<title>Credits and License</title>
		<para>&palapeli; aims to bring the unagitated fun and challenge of jigsaw puzzles to your desktop.</para>
		<para>The idea was first developed by Bernhard Schiffner, together with Stefan Majewsky, who is the current lead developer of &palapeli;. The &psc; was contributed by Johannes L&#xF6;hnert.</para>
		<para>Documentation Copyright 2009, 2010 Johannes L&#xF6;hnert, Stefan Majewsky.</para>
		<!-- TRANS:CREDIT_FOR_TRANSLATORS -->
		&underFDL;
		&underGPL;
	</chapter>

	<appendix id="installation">
		<title>Installation</title>
		&install.intro.documentation;
		<sect1 id="Compilation">
			<title>Compilation and Installation</title>
			&install.compile.documentation;
		</sect1>
	</appendix>
	&documentation.index;
</book>
