QSvgGenerator Class
The QSvgGenerator class provides a paint device that is used to create SVG drawings. 更多...
| 头文件: | #include <QSvgGenerator> |
| qmake: | QT += svg |
| 开始支持版本: | Qt 4.3 |
| 基类: | QPaintDevice |
Note: All functions in this class are reentrant.
属性
|
公有函数
| QSvgGenerator() | |
| ~QSvgGenerator() | |
| QString | description() const |
| QString | fileName() const |
| QIODevice * | outputDevice() const |
| int | resolution() const |
| void | setDescription(const QString &description) |
| void | setFileName(const QString &fileName) |
| void | setOutputDevice(QIODevice *outputDevice) |
| void | setResolution(int dpi) |
| void | setSize(const QSize &size) |
| void | setTitle(const QString &title) |
| void | setViewBox(const QRect &viewBox) |
| void | setViewBox(const QRectF &viewBox) |
| QSize | size() const |
| QString | title() const |
| QRect | viewBox() const |
| QRectF | viewBoxF() const |
- 14 个公有函数继承自 QPaintDevice
重新实现的受保护函数
| virtual int | metric(QPaintDevice::PaintDeviceMetric metric) const override |
| virtual QPaintEngine * | paintEngine() const override |
- 1 个受保护的函数继承自 QPaintDevice
其他继承的成员
- 1 个受保护的函数继承自 QPaintDevice
- 1 protected type inherited from QPaintDevice
详细描述
The QSvgGenerator class provides a paint device that is used to create SVG drawings.
This paint device represents a Scalable Vector Graphics (SVG) drawing. Like QPrinter, it is designed as a write-only device that generates output in a specific format.
To write an SVG file, you first need to configure the output by setting the fileName or outputDevice properties. It is usually necessary to specify the size of the drawing by setting the size property, and in some cases where the drawing will be included in another, the viewBox property also needs to be set.
QSvgGenerator generator;
generator.setFileName(path);
generator.setSize(QSize(200, 200));
generator.setViewBox(QRect(0, 0, 200, 200));
generator.setTitle(tr("SVG Generator Example Drawing"));
generator.setDescription(tr("An SVG drawing created by the SVG Generator "
"Example provided with Qt."));
Other meta-data can be specified by setting the title, description and resolution properties.
As with other QPaintDevice subclasses, a QPainter object is used to paint onto an instance of this class:
QPainter painter;
painter.begin(&generator);
...
painter.end();
Painting is performed in the same way as for any other paint device. However, it is necessary to use the QPainter::begin() and end() to explicitly begin and end painting on the device.
The SVG Generator Example shows how the same painting commands can be used for painting a widget and writing an SVG file.
参见 QSvgRenderer, QSvgWidget, and Qt SVG C++ Classes.
属性
description : QString
This property holds the description of the generated SVG drawing
This property was introduced in Qt 4.5.
访问函数:
| QString | description() const |
| void | setDescription(const QString &description) |
参见 title.
fileName : QString
This property holds the target filename for the generated SVG drawing
This property was introduced in Qt 4.5.
访问函数:
| QString | fileName() const |
| void | setFileName(const QString &fileName) |
参见 outputDevice.
outputDevice : QIODevice *
This property holds the output device for the generated SVG drawing
If both output device and file name are specified, the output device will have precedence.
This property was introduced in Qt 4.5.
访问函数:
| QIODevice * | outputDevice() const |
| void | setOutputDevice(QIODevice *outputDevice) |
参见 fileName.
resolution : int
This property holds the resolution of the generated output
The resolution is specified in dots per inch, and is used to calculate the physical size of an SVG drawing.
This property was introduced in Qt 4.5.
访问函数:
| int | resolution() const |
| void | setResolution(int dpi) |
size : QSize
This property holds the size of the generated SVG drawing
By default this property is set to QSize(-1, -1), which indicates that the generator should not output the width and height attributes of the <svg> element.
Note: It is not possible to change this property while a QPainter is active on the generator.
This property was introduced in Qt 4.5.
访问函数:
| QSize | size() const |
| void | setSize(const QSize &size) |
参见 viewBox and resolution.
title : QString
This property holds the title of the generated SVG drawing
This property was introduced in Qt 4.5.
访问函数:
| QString | title() const |
| void | setTitle(const QString &title) |
参见 description.
viewBox : QRectF
This property holds the viewBox of the generated SVG drawing
By default this property is set to QRect(0, 0, -1, -1), which indicates that the generator should not output the viewBox attribute of the <svg> element.
Note: It is not possible to change this property while a QPainter is active on the generator.
This property was introduced in Qt 4.5.
访问函数:
| QRectF | viewBoxF() const |
| void | setViewBox(const QRect &viewBox) |
| void | setViewBox(const QRectF &viewBox) |
参见 viewBox(), size, and resolution.
成员函数
QSvgGenerator::QSvgGenerator()
Constructs a new generator.
QSvgGenerator::~QSvgGenerator()
Destroys the generator.
[override virtual protected] int QSvgGenerator::metric(QPaintDevice::PaintDeviceMetric metric) const
重新实现 QPaintDevice::metric().
[override virtual protected] QPaintEngine *QSvgGenerator::paintEngine() const
重新实现 QPaintDevice::paintEngine().
Returns the paint engine used to render graphics to be converted to SVG format information.
QRect QSvgGenerator::viewBox() const
Returns viewBoxF().toRect().
This function was introduced in Qt 4.5.
参见 setViewBox() and viewBoxF().