diff options
Diffstat (limited to 'examples/widgets/doc/basicdrawing.qdoc')
| -rw-r--r-- | examples/widgets/doc/basicdrawing.qdoc | 70 |
1 files changed, 35 insertions, 35 deletions
diff --git a/examples/widgets/doc/basicdrawing.qdoc b/examples/widgets/doc/basicdrawing.qdoc index 899aa361f8..9e7e7ae65e 100644 --- a/examples/widgets/doc/basicdrawing.qdoc +++ b/examples/widgets/doc/basicdrawing.qdoc @@ -26,7 +26,7 @@ ****************************************************************************/ /*! - \example painting/basicdrawing + \example widgets/painting/basicdrawing \title Basic Drawing Example The Basic Drawing example shows how to display basic graphics @@ -68,7 +68,7 @@ window displaying a \c RenderArea widget in addition to several parameter widgets. - \snippet painting/basicdrawing/window.h 0 + \snippet widgets/painting/basicdrawing/window.h 0 We declare the various widgets, and three private slots updating the \c RenderArea widget: The \c shapeChanged() slot updates the @@ -83,14 +83,14 @@ In the constructor we create and initialize the various widgets appearing in the main application window. - \snippet painting/basicdrawing/window.cpp 1 + \snippet widgets/painting/basicdrawing/window.cpp 1 First we create the \c RenderArea widget that will render the currently active shape. Then we create the \uicontrol Shape combobox, and add the associated items (i.e. the different shapes a QPainter can draw). - \snippet painting/basicdrawing/window.cpp 2 + \snippet widgets/painting/basicdrawing/window.cpp 2 QPainter's pen is a QPen object; the QPen class defines how a painter should draw lines and outlines of shapes. A pen has @@ -103,7 +103,7 @@ We create a QSpinBox for the \uicontrol {Pen Width} parameter. - \snippet painting/basicdrawing/window.cpp 3 + \snippet widgets/painting/basicdrawing/window.cpp 3 The pen style defines the line type. The default style is solid (Qt::SolidLine). Setting the style to none (Qt::NoPen) tells the @@ -117,7 +117,7 @@ items (i.e the values of the Qt::PenStyle, Qt::PenCapStyle and Qt::PenJoinStyle enums respectively). - \snippet painting/basicdrawing/window.cpp 4 + \snippet widgets/painting/basicdrawing/window.cpp 4 The QBrush class defines the fill pattern of shapes drawn by a QPainter. The default brush style is Qt::NoBrush. This style tells @@ -127,8 +127,8 @@ We create a QComboBox for the \uicontrol {Brush Style} parameter, and add the associated items (i.e. the values of the Qt::BrushStyle enum). - \snippet painting/basicdrawing/window.cpp 5 - \snippet painting/basicdrawing/window.cpp 6 + \snippet widgets/painting/basicdrawing/window.cpp 5 + \snippet widgets/painting/basicdrawing/window.cpp 6 Antialiasing is a feature that "smoothes" the pixels to create more even and less jagged lines, and can be applied using @@ -138,7 +138,7 @@ We simply create a QCheckBox for the \uicontrol Antialiasing option. - \snippet painting/basicdrawing/window.cpp 7 + \snippet widgets/painting/basicdrawing/window.cpp 7 The \uicontrol Transformations option implies a manipulation of the coordinate system that will appear as if the rendered shape is @@ -148,21 +148,21 @@ QPainter::scale() functions to implement this feature represented in the main application window by a simple QCheckBox. - \snippet painting/basicdrawing/window.cpp 8 + \snippet widgets/painting/basicdrawing/window.cpp 8 Then we connect the parameter widgets with their associated slots using the static QObject::connect() function, ensuring that the \c RenderArea widget is updated whenever the user changes the shape, or any of the other parameters. - \snippet painting/basicdrawing/window.cpp 9 - \snippet painting/basicdrawing/window.cpp 10 + \snippet widgets/painting/basicdrawing/window.cpp 9 + \snippet widgets/painting/basicdrawing/window.cpp 10 Finally, we add the various widgets to a layout, and call the \c shapeChanged(), \c penChanged(), and \c brushChanged() slots to initialize the application. We also turn on antialiasing. - \snippet painting/basicdrawing/window.cpp 11 + \snippet widgets/painting/basicdrawing/window.cpp 11 The \c shapeChanged() slot is called whenever the user changes the currently active shape. @@ -185,7 +185,7 @@ add the following line of code to the beginning of the \c window.cpp file. - \snippet painting/basicdrawing/window.cpp 0 + \snippet widgets/painting/basicdrawing/window.cpp 0 The QComboBox::itemData() function returns the data as a QVariant, so we need to cast the data to \c RenderArea::Shape. If there is @@ -195,20 +195,20 @@ In the end we call the \c RenderArea::setShape() slot to update the \c RenderArea widget. - \snippet painting/basicdrawing/window.cpp 12 + \snippet widgets/painting/basicdrawing/window.cpp 12 We call the \c penChanged() slot whenever the user changes any of the pen parameters. Again we use the QComboBox::itemData() function to retrieve the parameters, and then we call the \c RenderArea::setPen() slot to update the \c RenderArea widget. - \snippet painting/basicdrawing/window.cpp 13 + \snippet widgets/painting/basicdrawing/window.cpp 13 The brushChanged() slot is called whenever the user changes the brush parameter which we retrieve using the QComboBox::itemData() function as before. - \snippet painting/basicdrawing/window.cpp 14 + \snippet widgets/painting/basicdrawing/window.cpp 14 If the brush parameter is a gradient fill, special actions are required. @@ -232,7 +232,7 @@ In the end we call \c RenderArea::setBrush() slot to update the \c RenderArea widget's brush with the QLinearGradient object. - \snippet painting/basicdrawing/window.cpp 15 + \snippet widgets/painting/basicdrawing/window.cpp 15 A similar pattern of actions, as the one used for QLinearGradient, is used in the cases of Qt::RadialGradientPattern and @@ -247,13 +247,13 @@ first argument specifies the center of the conical, and the second specifies the start angle of the interpolation. - \snippet painting/basicdrawing/window.cpp 16 + \snippet widgets/painting/basicdrawing/window.cpp 16 If the brush style is Qt::TexturePattern we create a QBrush from a QPixmap. Then we call \c RenderArea::setBrush() slot to update the \c RenderArea widget with the newly created brush. - \snippet painting/basicdrawing/window.cpp 17 + \snippet widgets/painting/basicdrawing/window.cpp 17 Otherwise we simply create a brush with the given style and a green color, and then call \c RenderArea::setBrush() slot to @@ -264,7 +264,7 @@ The \c RenderArea class inherits QWidget, and renders multiple copies of the currently active shape using a QPainter. - \snippet painting/basicdrawing/renderarea.h 0 + \snippet widgets/painting/basicdrawing/renderarea.h 0 First we define a public \c Shape enum to hold the different shapes that can be rendered by the widget (i.e the shapes that can @@ -287,7 +287,7 @@ In the constructor we initialize some of the widget's variables. - \snippet painting/basicdrawing/renderarea.cpp 0 + \snippet widgets/painting/basicdrawing/renderarea.cpp 0 We set its shape to be a \uicontrol Polygon, its antialiased property to be false and we load an image into the widget's pixmap @@ -296,7 +296,7 @@ will be used to render the background. QPalette::Base is typically white. - \snippet painting/basicdrawing/renderarea.cpp 2 + \snippet widgets/painting/basicdrawing/renderarea.cpp 2 The \c RenderArea inherits QWidget's \l {QWidget::sizeHint()}{sizeHint} property holding the recommended @@ -310,7 +310,7 @@ Our reimplementation of the function returns a QSize with a 400 pixels width and a 200 pixels height. - \snippet painting/basicdrawing/renderarea.cpp 1 + \snippet widgets/painting/basicdrawing/renderarea.cpp 1 \c RenderArea also inherits QWidget's \l{QWidget::minimumSizeHint()}{minimumSizeHint} property holding @@ -324,11 +324,11 @@ Our reimplementation of the function returns a QSize with a 100 pixels width and a 100 pixels height. - \snippet painting/basicdrawing/renderarea.cpp 3 + \snippet widgets/painting/basicdrawing/renderarea.cpp 3 \codeline - \snippet painting/basicdrawing/renderarea.cpp 4 + \snippet widgets/painting/basicdrawing/renderarea.cpp 4 \codeline - \snippet painting/basicdrawing/renderarea.cpp 5 + \snippet widgets/painting/basicdrawing/renderarea.cpp 5 The public \c setShape(), \c setPen() and \c setBrush() slots are called whenever we want to modify a \c RenderArea widget's shape, @@ -340,16 +340,16 @@ repaint; instead it schedules a paint event for processing when Qt returns to the main event loop. - \snippet painting/basicdrawing/renderarea.cpp 6 + \snippet widgets/painting/basicdrawing/renderarea.cpp 6 \codeline - \snippet painting/basicdrawing/renderarea.cpp 7 + \snippet widgets/painting/basicdrawing/renderarea.cpp 7 With the \c setAntialiased() and \c setTransformed() slots we change the state of the properties according to the slot parameter, and call the QWidget::update() slot to make the changes visible in the \c RenderArea widget. - \snippet painting/basicdrawing/renderarea.cpp 8 + \snippet widgets/painting/basicdrawing/renderarea.cpp 8 Then we reimplement the QWidget::paintEvent() function. The first thing we do is to create the graphical objects we will need to @@ -373,7 +373,7 @@ In addition we define a start angle and an arc length that we will use when drawing the \uicontrol Arc, \uicontrol Chord and \uicontrol Pie shapes. - \snippet painting/basicdrawing/renderarea.cpp 9 + \snippet widgets/painting/basicdrawing/renderarea.cpp 9 We create a QPainter for the \c RenderArea widget, and set the painters pen and brush according to the \c RenderArea's pen and @@ -382,7 +382,7 @@ indicates that the engine should antialias edges of primitives if possible. - \snippet painting/basicdrawing/renderarea.cpp 10 + \snippet widgets/painting/basicdrawing/renderarea.cpp 10 Finally, we render the multiple copies of the \c RenderArea's shape. The number of copies is depending on the size of the \c @@ -397,7 +397,7 @@ will be rendered on top of each other in the top left cormer of the \c RenderArea widget. - \snippet painting/basicdrawing/renderarea.cpp 11 + \snippet widgets/painting/basicdrawing/renderarea.cpp 11 If the \uicontrol Transformations parameter option is checked, we do an additional translation of the coordinate system before we rotate @@ -409,7 +409,7 @@ Now, when rendering the shape, it will appear as if it was rotated in three dimensions. - \snippet painting/basicdrawing/renderarea.cpp 12 + \snippet widgets/painting/basicdrawing/renderarea.cpp 12 Next, we identify the \c RenderArea's shape, and render it using the associated QPainter drawing function: @@ -437,7 +437,7 @@ lose the knowledge of this point unless we save the current painter state \e before we start the translating process. - \snippet painting/basicdrawing/renderarea.cpp 13 + \snippet widgets/painting/basicdrawing/renderarea.cpp 13 Then, when we are finished rendering a copy of the shape we can restore the original painter state, with its associated coordinate |