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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 > TQCanvasSpline Class Reference< br > < small > [< a href = "canvas.html" > canvas module< / a > ]< / small > < / h1 >
< p > The TQCanvasSpline class provides multi-bezier splines on a TQCanvas.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "tqcanvas-h.html" > tqcanvas.h< / a > > < / tt >
< p > Inherits < a href = "tqcanvaspolygon.html" > TQCanvasPolygon< / a > .
< p > < a href = "tqcanvasspline-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQCanvasSpline" > < b > TQCanvasSpline< / b > < / a > ( TQCanvas * canvas )< / li >
< li class = fn > < a href = "#~TQCanvasSpline" > < b > ~TQCanvasSpline< / b > < / a > ()< / li >
< li class = fn > void < a href = "#setControlPoints" > < b > setControlPoints< / b > < / a > ( TQPointArray ctrl, bool close = TRUE )< / li >
< li class = fn > TQPointArray < a href = "#controlPoints" > < b > controlPoints< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#closed" > < b > closed< / b > < / a > () const< / li >
< li class = fn > virtual int < a href = "#rtti" > < b > rtti< / b > < / a > () const< / li >
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< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQCanvasSpline class provides multi-bezier splines on a < a href = "tqcanvas.html" > TQCanvas< / a > .
< p >
< p > A TQCanvasSpline is a sequence of 4-point bezier curves joined
together to make a curved shape.
< p > You set the control points of the spline with < a href = "#setControlPoints" > setControlPoints< / a > ().
< p > If the bezier is < a href = "#closed" > closed< / a > (), then the first control point will be
re-used as the last control point. Therefore, a closed bezier must
have a multiple of 3 control points and an open bezier must have
one extra point.
< p > The beziers are not necessarily joined "smoothly". To ensure this,
set control points appropriately (general reference texts about
beziers will explain this in detail).
< p > Like any other canvas item splines can be moved with
< a href = "tqcanvasitem.html#move" > TQCanvasItem::move< / a > () and < a href = "tqcanvasitem.html#moveBy" > TQCanvasItem::moveBy< / a > (), or by setting
coordinates with < a href = "tqcanvasitem.html#setX" > TQCanvasItem::setX< / a > (), < a href = "tqcanvasitem.html#setY" > TQCanvasItem::setY< / a > () and
< a href = "tqcanvasitem.html#setZ" > TQCanvasItem::setZ< / a > ().
< p > < p > See also < a href = "graphics.html" > Graphics Classes< / a > and < a href = "images.html" > Image Processing Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQCanvasSpline" > < / a > TQCanvasSpline::TQCanvasSpline ( < a href = "tqcanvas.html" > TQCanvas< / a > * canvas )
< / h3 >
Create a spline with no control points on the canvas < em > canvas< / em > .
< p > < p > See also < a href = "#setControlPoints" > setControlPoints< / a > ().
< h3 class = fn > < a name = "~TQCanvasSpline" > < / a > TQCanvasSpline::~TQCanvasSpline ()
< / h3 >
Destroy the spline.
< h3 class = fn > bool < a name = "closed" > < / a > TQCanvasSpline::closed () const
< / h3 >
Returns TRUE if the control points are a closed set; otherwise
returns FALSE.
< h3 class = fn > < a href = "tqpointarray.html" > TQPointArray< / a > < a name = "controlPoints" > < / a > TQCanvasSpline::controlPoints () const
< / h3 >
Returns the current set of control points.
< p > < p > See also < a href = "#setControlPoints" > setControlPoints< / a > () and < a href = "#closed" > closed< / a > ().
< h3 class = fn > int < a name = "rtti" > < / a > TQCanvasSpline::rtti () const< tt > [virtual]< / tt >
< / h3 >
Returns 8 (TQCanvasItem::Rtti_Spline).
< p > < p > See also < a href = "tqcanvasitem.html#rtti" > TQCanvasItem::rtti< / a > ().
< p > Reimplemented from < a href = "tqcanvaspolygon.html#rtti" > TQCanvasPolygon< / a > .
< h3 class = fn > void < a name = "setControlPoints" > < / a > TQCanvasSpline::setControlPoints ( < a href = "tqpointarray.html" > TQPointArray< / a > ctrl, bool close = TRUE )
< / h3 >
Set the spline control points to < em > ctrl< / em > .
< p > If < em > close< / em > is TRUE, then the first point in < em > ctrl< / em > will be
re-used as the last point, and the number of control points must
be a multiple of 3. If < em > close< / em > is FALSE, one additional control
point is required, and the number of control points must be one of
(4, 7, 10, 13, ...).
< p > If the number of control points doesn't meet the above conditions,
the number of points will be truncated to the largest number of
points that do meet the requirement.
< p > Example: < a href = "canvas-example.html#x2926" > canvas/canvas.cpp< / a > .
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