内容

• 特性
• 公共函数
• 重实现保护函数
• 详细描述

QSvgGenerator 类

The QSvgGenerator class provides a paint device that is used to create SVG drawings. 更多...

头：	#include <QSvgGenerator>
qmake:	QT += svg
Since:	Qt 4.3
继承：	QPaintDevice

• 所有成员列表，包括继承成员

注意： 此类的所有函数 可重入 .

特性

description : QString fileName : QString outputDevice : QIODevice * resolution : int

size : QSize title : QString viewBox : QRectF

公共函数

	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 公共函数继承自 QPaintDevice

重实现保护函数

virtual int	metric (QPaintDevice::PaintDeviceMetric metric ) const override
virtual QPaintEngine *	paintEngine () const override

• 1 保护函数继承自 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 特性。

As with other QPaintDevice 子类， 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 () 和 end() to explicitly begin and end painting on the device.

The SVG 生成器范例 shows how the same painting commands can be used for painting a widget and writing an SVG file.

另请参阅 QSvgRenderer , QSvgWidget ，和 Qt SVG C++ 类 .

特性文档编制

description : QString

此特性保持生成 SVG 绘制的描述

该特性在 Qt 4.5 引入。

访问函数：

QString	description () const
void	setDescription (const QString & description )

另请参阅 title .

fileName : QString

This property holds the target filename for the generated SVG drawing

该特性在 Qt 4.5 引入。

访问函数：

QString	fileName () const
void	setFileName (const QString & fileName )

另请参阅 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.

该特性在 Qt 4.5 引入。

访问函数：

QIODevice *	outputDevice () const
void	setOutputDevice (QIODevice * outputDevice )

另请参阅 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.

该特性在 Qt 4.5 引入。

访问函数：

int	resolution () const
void	setResolution (int dpi )

另请参阅 size and viewBox .

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> 元素。

注意： It is not possible to change this property while a QPainter is active on the generator.

该特性在 Qt 4.5 引入。

访问函数：

QSize	size () const
void	setSize (const QSize & size )

另请参阅 viewBox and resolution .

title : QString

This property holds the title of the generated SVG drawing

该特性在 Qt 4.5 引入。

访问函数：

QString	title () const
void	setTitle (const QString & title )

另请参阅 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> 元素。

注意： It is not possible to change this property while a QPainter is active on the generator.

该特性在 Qt 4.5 引入。

访问函数：

QRectF	viewBoxF () const
void	setViewBox (const QRect & viewBox )
void	setViewBox (const QRectF & viewBox )

另请参阅 viewBox (), size ，和 resolution .

成员函数文档编制

QSvgGenerator:: QSvgGenerator ()

构造新的生成器。

QSvgGenerator:: ~QSvgGenerator ()

销毁生成器。

[override virtual protected] int QSvgGenerator:: metric ( QPaintDevice::PaintDeviceMetric metric ) const

重实现自 QPaintDevice::metric ().

[override virtual protected] QPaintEngine *QSvgGenerator:: paintEngine () const

重实现自 QPaintDevice::paintEngine ().

Returns the paint engine used to render graphics to be converted to SVG format information.

QRect QSvgGenerator:: viewBox () const

返回 viewBoxF ().toRect().

该函数在 Qt 4.5 引入。

另请参阅 setViewBox () 和 viewBoxF ().