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authorKavindra Devi Palaraja <kavindra.palaraja@nokia.com>2009-08-25 15:35:11 (GMT)
committerKavindra Devi Palaraja <kavindra.palaraja@nokia.com>2009-08-25 15:35:21 (GMT)
commitad339905faf25e0f960ae554367b971b2e5c7731 (patch)
tree75ae95cb90a640af1f7e5cdacd34639e7296e9e2 /src
parent5396b8e11ac6e802fdcb9ff0ad6ef2cd64aea260 (diff)
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Doc - Reviewing documentation for QGraphicsEffect and QGraphicsEffectSource
Reviewed-By: TrustMe
Diffstat (limited to 'src')
-rw-r--r--src/gui/effects/qgraphicseffect.cpp54
1 files changed, 30 insertions, 24 deletions
diff --git a/src/gui/effects/qgraphicseffect.cpp b/src/gui/effects/qgraphicseffect.cpp
index fbd53b0..3274f4d 100644
--- a/src/gui/effects/qgraphicseffect.cpp
+++ b/src/gui/effects/qgraphicseffect.cpp
@@ -41,23 +41,24 @@
/*!
\class QGraphicsEffect
- \brief The QGraphicsEffect class is the base class for all graphics effects.
+ \brief The QGraphicsEffect class is the base class for all graphics
+ effects.
\since 4.6
\ingroup multimedia
\ingroup graphicsview-api
Effects alter the appearance of elements by hooking into the rendering
- pipeline and operating between the source (e.g., a QGraphicsPixmapItem),
+ pipeline and operating between the source (e.g., a QGraphicsPixmapItem)
and the destination device (e.g., QGraphicsView's viewport). Effects can be
- disabled by calling setEnabled(); if the effect is disabled, the source is
- rendered directly.
+ disabled by calling setEnabled(false). If effects are disabled, the source
+ is rendered directly.
- If you want to add a visual effect to a e.g. a QGraphicsItem, you can either use
- one of the standard effects, or create your own effect by making a subclass
- of QGraphicsEffect. The effect can then be installed on the item by calling
- QGraphicsItem::setGraphicsEffect.
+ To add a visual effect to a QGraphicsItem, for example, you can use one of
+ the standard effects, or alternately, create your own effect by creating a
+ subclass of QGraphicsEffect. The effect can then be installed on the item
+ using QGraphicsItem::setGraphicsEffect().
- Qt provides several standard effects, including:
+ Qt provides the following standard effects:
\list
\o QGraphicsGrayScaleEffect - renders the item in shades of gray
@@ -69,19 +70,24 @@
\o QGrahicsShaderEffect - renders the item with a pixel shader fragment
\endlist
- If all you want is to add an effect to an item, you should visit the
- documentation for the specific effect to learn more about how each effect
- can be used.
- If you want to create your own custom effect, you can start by creating a
- subclass of QGraphicsEffect (or any of the existing effects), and
- reimplement the virtual function draw(). This function is called whenever
- the effect needs to redraw. draw() has two arguments: the painter, and a
- pointer to the source (QGraphicsEffectSource). The source provides extra
- context information, such as a pointer to the item that is rendering the
- effect, any cached pixmap data, and the device rect bounds. See the draw()
- documentation for more details. You can also get a pointer to the current
- source by calling source().
+ For more information on how to use each effect, refer to the specific
+ effect's documentation.
+
+ To create your own custom effect, create a subclass of QGraphicsEffect (or
+ any other existing effects) and reimplement the virtual function draw().
+ This function is called whenever the effect needs to redraw. The draw()
+ function accepts two arguments: the painter and a pointer to the source
+ (QGraphicsEffectSource). The source provides extra context information,
+ such as a pointer to the item that is rendering the effect, any cached
+ pixmap data, or the device rect bounds. For more information, refer to the
+ documenation for draw(). To obtain a pointer to the current source, simply
+ call source().
+
+ If your effect changes, use update() to request for a redraw. If your
+ custom effect changes the bounding rectangle of the source, e.g., a radial
+ glow effect may need to apply an extra margin,
+
If your effect changes, you can call update() to request a redraw. If your
custom effect changes the bounding rectangle of the source (e.g., a radial
@@ -107,11 +113,11 @@ QT_BEGIN_NAMESPACE
/*!
\class QGraphicsEffectSource
- \brief The QGraphicsEffectSource represents the source of which a QGraphicsEffect
- is installed on.
+ \brief The QGraphicsEffectSource represents the source on which a
+ QGraphicsEffect is installed on.
\since 4.6
- When a QGraphicsEffect is installed on e.g. a QGraphicsItem, this class will act as
+ When a QGraphicsEffect is installed on a QGraphicsItem, for example, this class will act as
a wrapper around QGraphicsItem. E.g. calling update() is effectively the same as
calling QGraphicsItem::update().