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+<title>TQCanvasItem Class</title>
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+<font color="#004faf">Home</font></a>
+ | <a href="classes.html">
+<font color="#004faf">All&nbsp;Classes</font></a>
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+<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQCanvasItem Class Reference<br><small>[<a href="canvas.html">canvas module</a>]</small></h1>
+
+<p>The TQCanvasItem class provides an abstract graphic object on a TQCanvas.
+<a href="#details">More...</a>
+<p><tt>#include &lt;<a href="qcanvas-h.html">qcanvas.h</a>&gt;</tt>
+<p>Inherits <a href="qt.html">TQt</a>.
+<p>Inherited by <a href="qcanvassprite.html">TQCanvasSprite</a>, <a href="qcanvaspolygonalitem.html">TQCanvasPolygonalItem</a>, and <a href="qcanvastext.html">TQCanvasText</a>.
+<p><a href="qcanvasitem-members.html">List of all member functions.</a>
+<h2>Public Members</h2>
+<ul>
+<li class=fn><a href="#TQCanvasItem"><b>TQCanvasItem</b></a> ( TQCanvas&nbsp;*&nbsp;canvas )</li>
+<li class=fn>virtual <a href="#~TQCanvasItem"><b>~TQCanvasItem</b></a> ()</li>
+<li class=fn>double <a href="#x"><b>x</b></a> () const</li>
+<li class=fn>double <a href="#y"><b>y</b></a> () const</li>
+<li class=fn>double <a href="#z"><b>z</b></a> () const</li>
+<li class=fn>virtual void <a href="#moveBy"><b>moveBy</b></a> ( double&nbsp;dx, double&nbsp;dy )</li>
+<li class=fn>void <a href="#move"><b>move</b></a> ( double&nbsp;x, double&nbsp;y )</li>
+<li class=fn>void <a href="#setX"><b>setX</b></a> ( double&nbsp;x )</li>
+<li class=fn>void <a href="#setY"><b>setY</b></a> ( double&nbsp;y )</li>
+<li class=fn>void <a href="#setZ"><b>setZ</b></a> ( double&nbsp;z )</li>
+<li class=fn>bool <a href="#animated"><b>animated</b></a> () const</li>
+<li class=fn>virtual void <a href="#setAnimated"><b>setAnimated</b></a> ( bool&nbsp;y )</li>
+<li class=fn>virtual void <a href="#setVelocity"><b>setVelocity</b></a> ( double&nbsp;vx, double&nbsp;vy )</li>
+<li class=fn>void <a href="#setXVelocity"><b>setXVelocity</b></a> ( double&nbsp;vx )</li>
+<li class=fn>void <a href="#setYVelocity"><b>setYVelocity</b></a> ( double&nbsp;vy )</li>
+<li class=fn>double <a href="#xVelocity"><b>xVelocity</b></a> () const</li>
+<li class=fn>double <a href="#yVelocity"><b>yVelocity</b></a> () const</li>
+<li class=fn>virtual void <a href="#advance"><b>advance</b></a> ( int&nbsp;phase )</li>
+<li class=fn>virtual bool <a href="#collidesWith"><b>collidesWith</b></a> ( const&nbsp;TQCanvasItem&nbsp;*&nbsp;other ) const = 0</li>
+<li class=fn>TQCanvasItemList <a href="#collisions"><b>collisions</b></a> ( bool&nbsp;exact ) const</li>
+<li class=fn>virtual void <a href="#setCanvas"><b>setCanvas</b></a> ( TQCanvas&nbsp;*&nbsp;c )</li>
+<li class=fn>virtual void <a href="#draw"><b>draw</b></a> ( TQPainter&nbsp;&amp;&nbsp;painter ) = 0</li>
+<li class=fn>void <a href="#show"><b>show</b></a> ()</li>
+<li class=fn>void <a href="#hide"><b>hide</b></a> ()</li>
+<li class=fn>virtual void <a href="#setVisible"><b>setVisible</b></a> ( bool&nbsp;yes )</li>
+<li class=fn>bool <a href="#isVisible"><b>isVisible</b></a> () const</li>
+<li class=fn>virtual void <a href="#setSelected"><b>setSelected</b></a> ( bool&nbsp;yes )</li>
+<li class=fn>bool <a href="#isSelected"><b>isSelected</b></a> () const</li>
+<li class=fn>virtual void <a href="#setEnabled"><b>setEnabled</b></a> ( bool&nbsp;yes )</li>
+<li class=fn>bool <a href="#isEnabled"><b>isEnabled</b></a> () const</li>
+<li class=fn>virtual void <a href="#setActive"><b>setActive</b></a> ( bool&nbsp;yes )</li>
+<li class=fn>bool <a href="#isActive"><b>isActive</b></a> () const</li>
+<li class=fn>bool visible () const &nbsp;<em>(obsolete)</em></li>
+<li class=fn>bool selected () const &nbsp;<em>(obsolete)</em></li>
+<li class=fn>bool enabled () const &nbsp;<em>(obsolete)</em></li>
+<li class=fn>bool active () const &nbsp;<em>(obsolete)</em></li>
+<li class=fn>enum <a href="#RttiValues-enum"><b>RttiValues</b></a> { Rtti_Item = 0, Rtti_Sprite = 1, Rtti_PolygonalItem = 2, Rtti_Text = 3, Rtti_Polygon = 4, Rtti_Rectangle = 5, Rtti_Ellipse = 6, Rtti_Line = 7, Rtti_Spline = 8 }</li>
+<li class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</li>
+<li class=fn>virtual TQRect <a href="#boundingRect"><b>boundingRect</b></a> () const = 0</li>
+<li class=fn>virtual TQRect <a href="#boundingRectAdvanced"><b>boundingRectAdvanced</b></a> () const</li>
+<li class=fn>TQCanvas * <a href="#canvas"><b>canvas</b></a> () const</li>
+</ul>
+<h2>Protected Members</h2>
+<ul>
+<li class=fn>void <a href="#update"><b>update</b></a> ()</li>
+</ul>
+<hr><a name="details"></a><h2>Detailed Description</h2>
+
+
+The TQCanvasItem class provides an abstract graphic object on a <a href="qcanvas.html">TQCanvas</a>.
+
+<p>
+
+
+<p> A variety of TQCanvasItem subclasses provide immediately usable
+behaviour. This class is a pure abstract superclass providing the
+behaviour that is shared among all the concrete canvas item classes.
+TQCanvasItem is not intended for direct subclassing. It is much easier
+to subclass one of its subclasses, e.g. <a href="qcanvaspolygonalitem.html">TQCanvasPolygonalItem</a> (the
+commonest base class), <a href="qcanvasrectangle.html">TQCanvasRectangle</a>, <a href="qcanvassprite.html">TQCanvasSprite</a>, <a href="qcanvasellipse.html">TQCanvasEllipse</a>
+or <a href="qcanvastext.html">TQCanvasText</a>.
+<p> Canvas items are added to a canvas by constructing them and passing the
+canvas to the canvas item's constructor. An item can be moved to a
+different canvas using <a href="#setCanvas">setCanvas</a>().
+<p> Items appear on the canvas after their <a href="#show">show()</a>
+function has been called (or <a href="#setVisible">setVisible(TRUE)</a>), and <em>after</em> <a href="#update">update</a>() has been called. The
+canvas only shows items that are <a href="#setVisible">visible</a>,
+and then only if <a href="#update">update</a>() is called. If you created the canvas
+without passing a width and height to the constructor you'll also need
+to call <a href="qcanvas.html#resize">resize()</a>. Since the canvas
+background defaults to white and canvas items default to white,
+you may need to change colors to see your items.
+<p> A TQCanvasItem object can be moved in the <a href="#x">x</a>(), <a href="#y">y</a>() and <a href="#z">z</a>() dimensions
+using functions such as <a href="#move">move</a>(), <a href="#moveBy">moveBy</a>(), <a href="#setX">setX</a>(), <a href="#setY">setY</a>() and <a href="#setZ">setZ</a>(). A
+canvas item can be set in motion, `animated', using <a href="#setAnimated">setAnimated</a>() and
+given a velocity in the x and y directions with <a href="#setXVelocity">setXVelocity</a>() and
+<a href="#setYVelocity">setYVelocity</a>() -- the same effect can be achieved by calling
+<a href="#setVelocity">setVelocity</a>(). Use the <a href="#collidesWith">collidesWith</a>() function to see if the canvas item
+will collide on the <em>next</em> <a href="#advance">advance</a>(1) and use <a href="#collisions">collisions</a>() to see what
+collisions have occurred.
+<p> Use <a href="qcanvassprite.html">TQCanvasSprite</a> or your own subclass of TQCanvasSprite to create canvas
+items which are animated, i.e. which change over time.
+<p> The size of a canvas item is given by <a href="#boundingRect">boundingRect</a>(). Use
+<a href="#boundingRectAdvanced">boundingRectAdvanced</a>() to see what the size of the canvas item will be
+<em>after</em> the next advance(1) call.
+<p> The <a href="#rtti">rtti</a>() function is used for identifying subclasses of TQCanvasItem.
+The <a href="#canvas">canvas</a>() function returns a pointer to the canvas which contains the
+canvas item.
+<p> TQCanvasItem provides the <a href="#show">show</a>() and <a href="#isVisible">isVisible</a>() functions like those in
+<a href="qwidget.html">TQWidget</a>.
+<p> TQCanvasItem also provides the <a href="#setEnabled">setEnabled</a>(), <a href="#setActive">setActive</a>() and
+<a href="#setSelected">setSelected</a>() functions; these functions set the relevant boolean and
+cause a repaint but the boolean values they set are not used in
+TQCanvasItem itself. You can make use of these booleans in your subclasses.
+<p> By default, canvas items have no velocity, no size, and are not in
+motion. The subclasses provided in TQt do not change these defaults
+except where noted.
+<p> <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
+
+<hr><h2>Member Type Documentation</h2>
+<h3 class=fn><a name="RttiValues-enum"></a>TQCanvasItem::RttiValues</h3>
+
+<p> This enum is used to name the different types of canvas item.
+<ul>
+<li><tt>TQCanvasItem::Rtti_Item</tt> - Canvas item abstract base class
+<li><tt>TQCanvasItem::Rtti_Ellipse</tt>
+<li><tt>TQCanvasItem::Rtti_Line</tt>
+<li><tt>TQCanvasItem::Rtti_Polygon</tt>
+<li><tt>TQCanvasItem::Rtti_PolygonalItem</tt>
+<li><tt>TQCanvasItem::Rtti_Rectangle</tt>
+<li><tt>TQCanvasItem::Rtti_Spline</tt>
+<li><tt>TQCanvasItem::Rtti_Sprite</tt>
+<li><tt>TQCanvasItem::Rtti_Text</tt>
+</ul><p>
+<hr><h2>Member Function Documentation</h2>
+<h3 class=fn><a name="TQCanvasItem"></a>TQCanvasItem::TQCanvasItem ( <a href="qcanvas.html">TQCanvas</a>&nbsp;*&nbsp;canvas )
+</h3>
+Constructs a TQCanvasItem on canvas <em>canvas</em>.
+<p> <p>See also <a href="#setCanvas">setCanvas</a>().
+
+<h3 class=fn><a name="~TQCanvasItem"></a>TQCanvasItem::~TQCanvasItem ()<tt> [virtual]</tt>
+</h3>
+Destroys the TQCanvasItem and removes it from its canvas.
+
+<h3 class=fn>bool <a name="active"></a>TQCanvasItem::active () const
+</h3>
+<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
+<p>
+Use <a href="#isActive">isActive</a>() instead.
+
+<h3 class=fn>void <a name="advance"></a>TQCanvasItem::advance ( int&nbsp;phase )<tt> [virtual]</tt>
+</h3>
+The default implementation moves the canvas item, if it is
+<a href="#animated">animated</a>(), by the preset velocity if <em>phase</em> is 1, and does
+nothing if <em>phase</em> is 0.
+<p> Note that if you reimplement this function, the reimplementation
+must not change the canvas in any way, for example it must not add
+or remove items.
+<p> <p>See also <a href="qcanvas.html#advance">TQCanvas::advance</a>() and <a href="#setVelocity">setVelocity</a>().
+
+<p>Example: <a href="canvas-example.html#x2913">canvas/canvas.cpp</a>.
+<p>Reimplemented in <a href="qcanvassprite.html#advance">TQCanvasSprite</a>.
+<h3 class=fn>bool <a name="animated"></a>TQCanvasItem::animated () const
+</h3>
+Returns TRUE if the canvas item is in motion; otherwise returns
+FALSE.
+<p> <p>See also <a href="#setVelocity">setVelocity</a>() and <a href="#setAnimated">setAnimated</a>().
+
+<h3 class=fn><a href="qrect.html">TQRect</a> <a name="boundingRect"></a>TQCanvasItem::boundingRect () const<tt> [pure virtual]</tt>
+</h3>
+
+<p> Returns the bounding rectangle in pixels that the canvas item covers.
+<p> <p>See also <a href="#boundingRectAdvanced">boundingRectAdvanced</a>().
+
+<p>Reimplemented in <a href="qcanvassprite.html#boundingRect">TQCanvasSprite</a>, <a href="qcanvaspolygonalitem.html#boundingRect">TQCanvasPolygonalItem</a>, and <a href="qcanvastext.html#boundingRect">TQCanvasText</a>.
+<h3 class=fn><a href="qrect.html">TQRect</a> <a name="boundingRectAdvanced"></a>TQCanvasItem::boundingRectAdvanced () const<tt> [virtual]</tt>
+</h3>
+Returns the bounding rectangle of pixels that the canvas item <em>will</em> cover after <a href="#advance">advance</a>(1) is called.
+<p> <p>See also <a href="#boundingRect">boundingRect</a>().
+
+<h3 class=fn><a href="qcanvas.html">TQCanvas</a>&nbsp;* <a name="canvas"></a>TQCanvasItem::canvas () const
+</h3>
+
+<p> Returns the canvas containing the canvas item.
+
+<h3 class=fn>bool <a name="collidesWith"></a>TQCanvasItem::collidesWith ( const&nbsp;<a href="qcanvasitem.html">TQCanvasItem</a>&nbsp;*&nbsp;other ) const<tt> [pure virtual]</tt>
+</h3>
+
+<p> Returns TRUE if the canvas item will collide with the <em>other</em>
+item <em>after</em> they have moved by their current velocities;
+otherwise returns FALSE.
+<p> <p>See also <a href="#collisions">collisions</a>().
+
+<p>Example: <a href="canvas-example.html#x2914">canvas/canvas.cpp</a>.
+<h3 class=fn><a href="qcanvasitemlist.html">TQCanvasItemList</a> <a name="collisions"></a>TQCanvasItem::collisions ( bool&nbsp;exact ) const
+</h3>
+Returns the list of canvas items that this canvas item has
+collided with.
+<p> A collision is generally defined as occurring when the pixels of
+one item draw on the pixels of another item, but not all
+subclasses are so precise. Also, since pixel-wise collision
+detection can be slow, this function works in either exact or
+inexact mode, according to the <em>exact</em> parameter.
+<p> If <em>exact</em> is TRUE, the canvas items returned have been
+accurately tested for collision with the canvas item.
+<p> If <em>exact</em> is FALSE, the canvas items returned are <em>near</em> the
+canvas item. You can test the canvas items returned using
+<a href="#collidesWith">collidesWith</a>() if any are interesting collision candidates. By
+using this approach, you can ignore some canvas items for which
+collisions are not relevant.
+<p> The returned list is a list of TQCanvasItems, but often you will
+need to cast the items to their subclass types. The safe way to do
+this is to use <a href="#rtti">rtti</a>() before casting. This provides some of the
+functionality of the standard C++ dynamic cast operation even on
+compilers where dynamic casts are not available.
+<p> Note that a canvas item may be `on' a canvas, e.g. it was created
+with the canvas as parameter, even though its coordinates place it
+beyond the edge of the canvas's area. Collision detection only
+works for canvas items which are wholly or partly within the
+canvas's area.
+<p> Note that if items have a velocity (see <a href="#setVelocity">setVelocity</a>()), then
+collision testing is done based on where the item <em>will</em> be when
+it moves, not its current location. For example, a "ball" item
+doesn't need to actually embed into a "wall" item before a
+collision is detected. For items without velocity, plain
+intersection is used.
+
+<h3 class=fn>void <a name="draw"></a>TQCanvasItem::draw ( <a href="qpainter.html">TQPainter</a>&nbsp;&amp;&nbsp;painter )<tt> [pure virtual]</tt>
+</h3>
+
+<p> This abstract virtual function draws the canvas item using <em>painter</em>.
+<p> <b>Warning:</b> When you reimplement this function, make sure that you
+leave the painter in the same state as you found it. For example,
+if you start by calling <a href="qpainter.html#translate">TQPainter::translate</a>(50, 50), end your
+code by calling TQPainter::translate(-50, -50). Be also aware that
+the painter might already have some transformations set (i.e.,
+don't call <a href="qpainter.html#resetXForm">TQPainter::resetXForm</a>() when you're done).
+
+<p>Reimplemented in <a href="qcanvassprite.html#draw">TQCanvasSprite</a>, <a href="qcanvaspolygonalitem.html#draw">TQCanvasPolygonalItem</a>, and <a href="qcanvastext.html#draw">TQCanvasText</a>.
+<h3 class=fn>bool <a name="enabled"></a>TQCanvasItem::enabled () const
+</h3>
+<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
+<p>
+Use <a href="#isEnabled">isEnabled</a>() instead.
+
+<h3 class=fn>void <a name="hide"></a>TQCanvasItem::hide ()
+</h3> Shorthand for <a href="#setVisible">setVisible</a>(FALSE).
+<h3 class=fn>bool <a name="isActive"></a>TQCanvasItem::isActive () const
+</h3>
+
+<p> Returns TRUE if the TQCanvasItem is active; otherwise returns FALSE.
+
+<h3 class=fn>bool <a name="isEnabled"></a>TQCanvasItem::isEnabled () const
+</h3>
+
+<p> Returns TRUE if the TQCanvasItem is enabled; otherwise returns FALSE.
+
+<h3 class=fn>bool <a name="isSelected"></a>TQCanvasItem::isSelected () const
+</h3>
+
+<p> Returns TRUE if the canvas item is selected; otherwise returns FALSE.
+
+<h3 class=fn>bool <a name="isVisible"></a>TQCanvasItem::isVisible () const
+</h3>
+
+<p> Returns TRUE if the canvas item is visible; otherwise returns
+FALSE.
+<p> Note that in this context TRUE does <em>not</em> mean that the canvas
+item is currently in a view, merely that if a view is showing the
+area where the canvas item is positioned, and the item is not
+obscured by items with higher z values, and the view is not
+obscured by overlaying windows, it would be visible.
+<p> <p>See also <a href="#setVisible">setVisible</a>() and <a href="#z">z</a>().
+
+<h3 class=fn>void <a name="move"></a>TQCanvasItem::move ( double&nbsp;x, double&nbsp;y )
+</h3>
+Moves the canvas item to the absolute position (<em>x</em>, <em>y</em>).
+
+<p>Example: <a href="canvas-example.html#x2915">canvas/canvas.cpp</a>.
+<h3 class=fn>void <a name="moveBy"></a>TQCanvasItem::moveBy ( double&nbsp;dx, double&nbsp;dy )<tt> [virtual]</tt>
+</h3>
+Moves the canvas item relative to its current position by (<em>dx</em>,
+<em>dy</em>).
+
+<p>Example: <a href="canvas-example.html#x2916">canvas/canvas.cpp</a>.
+<h3 class=fn>int <a name="rtti"></a>TQCanvasItem::rtti () const<tt> [virtual]</tt>
+</h3>
+Returns 0 (TQCanvasItem::Rtti_Item).
+<p> Make your derived classes return their own values for <a href="#rtti">rtti</a>(), so
+that you can distinguish between objects returned by
+TQCanvas::at(). You should use values greater than 1000 to allow
+for extensions to this class.
+<p> Overuse of this functionality can damage it's extensibility. For
+example, once you have identified a base class of a TQCanvasItem
+found by TQCanvas::at(), cast it to that type and call meaningful
+methods rather than acting upon the object based on its rtti
+value.
+<p> For example:
+<p> <pre>
+ TQCanvasItem* item;
+ // Find an item, e.g. with TQCanvasItem::collisions().
+ ...
+ if (item-&gt;<a href="#rtti">rtti</a>() == MySprite::RTTI ) {
+ MySprite* s = (MySprite*)item;
+ if (s-&gt;isDamagable()) s-&gt;loseHitPoints(1000);
+ if (s-&gt;isHot()) myself-&gt;loseHitPoints(1000);
+ ...
+ }
+ </pre>
+
+
+<p>Example: <a href="canvas-example.html#x2917">canvas/canvas.cpp</a>.
+<p>Reimplemented in <a href="qcanvassprite.html#rtti">TQCanvasSprite</a>, <a href="qcanvaspolygonalitem.html#rtti">TQCanvasPolygonalItem</a>, and <a href="qcanvastext.html#rtti">TQCanvasText</a>.
+<h3 class=fn>bool <a name="selected"></a>TQCanvasItem::selected () const
+</h3>
+<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
+<p>
+Use <a href="#isSelected">isSelected</a>() instead.
+
+<h3 class=fn>void <a name="setActive"></a>TQCanvasItem::setActive ( bool&nbsp;yes )<tt> [virtual]</tt>
+</h3>
+Sets the active flag of the item to <em>yes</em>. If this changes the
+item's active state the item will be redrawn when
+<a href="qcanvas.html#update">TQCanvas::update</a>() is next called.
+<p> The <a href="qcanvas.html">TQCanvas</a>, TQCanvasItem and the TQt-supplied TQCanvasItem
+subclasses do not make use of this value. The <a href="#setActive">setActive</a>() function
+is supplied because many applications need it, but it is up to you
+how you use the <a href="#isActive">isActive</a>() value.
+
+<h3 class=fn>void <a name="setAnimated"></a>TQCanvasItem::setAnimated ( bool&nbsp;y )<tt> [virtual]</tt>
+</h3>
+Sets the canvas item to be in motion if <em>y</em> is TRUE, or not if <em>y</em> is FALSE. The speed and direction of the motion is set with
+<a href="#setVelocity">setVelocity</a>(), or with <a href="#setXVelocity">setXVelocity</a>() and <a href="#setYVelocity">setYVelocity</a>().
+<p> <p>See also <a href="#advance">advance</a>() and <a href="qcanvas.html#advance">TQCanvas::advance</a>().
+
+<h3 class=fn>void <a name="setCanvas"></a>TQCanvasItem::setCanvas ( <a href="qcanvas.html">TQCanvas</a>&nbsp;*&nbsp;c )<tt> [virtual]</tt>
+</h3>
+Sets the <a href="qcanvas.html">TQCanvas</a> upon which the canvas item is to be drawn to <em>c</em>.
+<p> <p>See also <a href="#canvas">canvas</a>().
+
+<h3 class=fn>void <a name="setEnabled"></a>TQCanvasItem::setEnabled ( bool&nbsp;yes )<tt> [virtual]</tt>
+</h3>
+Sets the enabled flag of the item to <em>yes</em>. If this changes the
+item's enabled state the item will be redrawn when
+<a href="qcanvas.html#update">TQCanvas::update</a>() is next called.
+<p> The <a href="qcanvas.html">TQCanvas</a>, TQCanvasItem and the TQt-supplied TQCanvasItem
+subclasses do not make use of this value. The <a href="#setEnabled">setEnabled</a>()
+function is supplied because many applications need it, but it is
+up to you how you use the <a href="#isEnabled">isEnabled</a>() value.
+
+<h3 class=fn>void <a name="setSelected"></a>TQCanvasItem::setSelected ( bool&nbsp;yes )<tt> [virtual]</tt>
+</h3>
+Sets the selected flag of the item to <em>yes</em>. If this changes the
+item's selected state the item will be redrawn when
+<a href="qcanvas.html#update">TQCanvas::update</a>() is next called.
+<p> The <a href="qcanvas.html">TQCanvas</a>, TQCanvasItem and the TQt-supplied TQCanvasItem
+subclasses do not make use of this value. The <a href="#setSelected">setSelected</a>()
+function is supplied because many applications need it, but it is
+up to you how you use the <a href="#isSelected">isSelected</a>() value.
+
+<h3 class=fn>void <a name="setVelocity"></a>TQCanvasItem::setVelocity ( double&nbsp;vx, double&nbsp;vy )<tt> [virtual]</tt>
+</h3>
+Sets the canvas item to be in motion, moving by <em>vx</em> and <em>vy</em>
+pixels in the horizontal and vertical directions respectively.
+<p> <p>See also <a href="#advance">advance</a>(), <a href="#setXVelocity">setXVelocity</a>(), and <a href="#setYVelocity">setYVelocity</a>().
+
+<h3 class=fn>void <a name="setVisible"></a>TQCanvasItem::setVisible ( bool&nbsp;yes )<tt> [virtual]</tt>
+</h3>
+Makes the canvas item visible if <em>yes</em> is TRUE, or invisible if
+<em>yes</em> is FALSE. The change takes effect when <a href="qcanvas.html#update">TQCanvas::update</a>() is
+next called.
+
+<h3 class=fn>void <a name="setX"></a>TQCanvasItem::setX ( double&nbsp;x )
+</h3>
+
+<p> Moves the canvas item so that its x-position is <em>x</em>.
+<p> <p>See also <a href="#x">x</a>() and <a href="#move">move</a>().
+
+<p>Example: <a href="tutorial2-06.html#x2568">chart/chartform_canvas.cpp</a>.
+<h3 class=fn>void <a name="setXVelocity"></a>TQCanvasItem::setXVelocity ( double&nbsp;vx )
+</h3>
+
+<p> Sets the horizontal component of the canvas item's velocity to <em>vx</em>.
+<p> <p>See also <a href="#setYVelocity">setYVelocity</a>() and <a href="#setVelocity">setVelocity</a>().
+
+<h3 class=fn>void <a name="setY"></a>TQCanvasItem::setY ( double&nbsp;y )
+</h3>
+
+<p> Moves the canvas item so that its y-position is <em>y</em>.
+<p> <p>See also <a href="#y">y</a>() and <a href="#move">move</a>().
+
+<p>Example: <a href="tutorial2-06.html#x2569">chart/chartform_canvas.cpp</a>.
+<h3 class=fn>void <a name="setYVelocity"></a>TQCanvasItem::setYVelocity ( double&nbsp;vy )
+</h3>
+
+<p> Sets the vertical component of the canvas item's velocity to <em>vy</em>.
+<p> <p>See also <a href="#setXVelocity">setXVelocity</a>() and <a href="#setVelocity">setVelocity</a>().
+
+<h3 class=fn>void <a name="setZ"></a>TQCanvasItem::setZ ( double&nbsp;z )
+</h3>
+
+<p> Sets the z index of the canvas item to <em>z</em>. Higher-z items
+obscure (are in front of) lower-z items.
+<p> <p>See also <a href="#z">z</a>() and <a href="#move">move</a>().
+
+<p>Examples: <a href="canvas-example.html#x2918">canvas/canvas.cpp</a> and <a href="tutorial2-06.html#x2570">chart/chartform_canvas.cpp</a>.
+<h3 class=fn>void <a name="show"></a>TQCanvasItem::show ()
+</h3> Shorthand for <a href="#setVisible">setVisible</a>(TRUE).
+<p>Examples: <a href="canvas-example.html#x2919">canvas/canvas.cpp</a> and <a href="tutorial2-06.html#x2571">chart/chartform_canvas.cpp</a>.
+<h3 class=fn>void <a name="update"></a>TQCanvasItem::update ()<tt> [protected]</tt>
+</h3>
+
+<p> Call this function to repaint the canvas's changed chunks.
+
+<h3 class=fn>bool <a name="visible"></a>TQCanvasItem::visible () const
+</h3>
+<b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
+<p>
+Use <a href="#isVisible">isVisible</a>() instead.
+
+<h3 class=fn>double <a name="x"></a>TQCanvasItem::x () const
+</h3>
+
+<p> Returns the horizontal position of the canvas item. Note that
+subclasses often have an origin other than the top-left corner.
+
+<p>Example: <a href="canvas-example.html#x2920">canvas/canvas.cpp</a>.
+<h3 class=fn>double <a name="xVelocity"></a>TQCanvasItem::xVelocity () const
+</h3>
+Returns the horizontal velocity component of the canvas item.
+
+<h3 class=fn>double <a name="y"></a>TQCanvasItem::y () const
+</h3>
+
+<p> Returns the vertical position of the canvas item. Note that
+subclasses often have an origin other than the top-left corner.
+
+<p>Example: <a href="canvas-example.html#x2921">canvas/canvas.cpp</a>.
+<h3 class=fn>double <a name="yVelocity"></a>TQCanvasItem::yVelocity () const
+</h3>
+Returns the vertical velocity component of the canvas item.
+
+<h3 class=fn>double <a name="z"></a>TQCanvasItem::z () const
+</h3>
+
+<p> Returns the z index of the canvas item, which is used for visual
+order: higher-z items obscure (are in front of) lower-z items.
+
+<!-- eof -->
+<hr><p>
+This file is part of the <a href="index.html">TQt toolkit</a>.
+Copyright &copy; 1995-2007
+<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
+<table width=100% cellspacing=0 border=0><tr>
+<td>Copyright &copy; 2007
+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>TQt 3.3.8</div>
+</table></div></address></body>
+</html>