# QPaintDevice Class Reference
## [[QtGui](index.htm) module]
在一個QPaintDevice類是可繪對象的基類。[More...](#details)
通過繼承[QGLFramebufferObject](qglframebufferobject.html),[QGLPixelBuffer](qglpixelbuffer.html),[QImage](qimage.html),[QPicture](qpicture.html),[QPixmap](qpixmap.html),[QPrinter](qprinter.html),[QSvgGenerator](qsvggenerator.html)和[QWidget](qwidget.html)。
### Types
* `enum PaintDeviceMetric { PdmWidth, PdmHeight, PdmWidthMM, PdmHeightMM, ..., PdmPhysicalDpiY }`
### Methods
* `__init__ (self)`
* `int colorCount (self)`
* `int depth (self)`
* `int height (self)`
* `int heightMM (self)`
* `int logicalDpiX (self)`
* `int logicalDpiY (self)`
* `int metric (self, PaintDeviceMetric?metric)`
* `int numColors (self)`
* `QPaintEngine paintEngine (self)`
* `bool paintingActive (self)`
* `int physicalDpiX (self)`
* `int physicalDpiY (self)`
* `int width (self)`
* `int widthMM (self)`
* * *
## Detailed Description
在一個QPaintDevice類是可繪對象的基類。
一種涂料設備是一個二維空間的抽象,可以使用被繪制[QPainter](qpainter.html)。其默認的坐標系統的原點位于左上角的位置。 X增加的權利和Y向下增加。該單元是一個像素。
一個QPaintDevice的繪圖功能由目前實施[QWidget](qwidget.html),[QImage](qimage.html),[QPixmap](qpixmap.html),[QGLPixelBuffer](qglpixelbuffer.html),[QPicture](qpicture.html)和[QPrinter](qprinter.html)子類。
要實現一個新的后臺支持,您必須來自一個QPaintDevice和重新實現虛擬[paintEngine](qpaintdevice.html#paintEngine)( )函數來告訴[QPainter](qpainter.html)其中繪圖引擎應該被用來繪制這個特定的設備上。請注意,您還必須創建一個相應的繪圖引擎,能夠繪制在設備上,即派生自[QPaintEngine](qpaintengine.html)并重新實現其虛函數。
**Warning:**Qt的規定,[QApplication](qapplication.html)對象存在可以創建任何油漆設備之前。油漆設備訪問窗口的系統資源,并創建一個應用程序對象之前,這些資源不被初始化。
在一個QPaintDevice類提供了一些函數返回的各種設備指標:該[depth](qpaintdevice.html#depth)()函數返回它的比特深度(位平面的數量)。該[height](qpaintdevice.html#height)( )函數返回它的高度在默認坐標系統的單位(如像素[QPixmap](qpixmap.html)和[QWidget](qwidget.html)),而[heightMM](qpaintdevice.html#heightMM)( )返回設備的高度以毫米為單位。 Similiarily時,[width](qpaintdevice.html#width)()和[widthMM](qpaintdevice.html#widthMM)( )函數返回的設備在默認的寬度坐標系單位和以毫米為單位,分別。或者,受保護的[metric](qpaintdevice.html#metric)()函數可用于通過指定所希望的檢索度量信息[PaintDeviceMetric](qpaintdevice.html#PaintDeviceMetric-enum)作為參數。
該[logicalDpiX](qpaintdevice.html#logicalDpiX)()和[logicalDpiY](qpaintdevice.html#logicalDpiY)( )函數返回設備的每英寸的點數的水平和垂直分辨率。該[physicalDpiX](qpaintdevice.html#physicalDpiX)()和[physicalDpiY](qpaintdevice.html#physicalDpiY)( )函數也返回該設備以每英寸點數的分辨率,但要注意,如果邏輯和物理分辨率不同,相應的[QPaintEngine](qpaintengine.html)必須處理的映射。最后,該[colorCount](qpaintdevice.html#colorCount)( )函數返回不同的顏色可供繪制設備的數量。
* * *
## Type Documentation
```
QPaintDevice.PaintDeviceMetric
```
描述了一個繪圖設備的各種指標。
| Constant | Value | Description |
| --- | --- | --- |
| `QPaintDevice.PdmWidth` | `1` | 涂料設備的默認寬度坐標系單位(如像素[QPixmap](qpixmap.html)和[QWidget](qwidget.html)) 。另請參閱[width](qpaintdevice.html#width)( ) 。 |
| `QPaintDevice.PdmHeight` | `2` | 涂料設備的默認高度坐標系單位(如像素[QPixmap](qpixmap.html)和[QWidget](qwidget.html)) 。另請參閱[height](qpaintdevice.html#height)( ) 。 |
| `QPaintDevice.PdmWidthMM` | `3` | 涂料設備以毫米為單位的寬度。另請參閱[widthMM](qpaintdevice.html#widthMM)( ) 。 |
| `QPaintDevice.PdmHeightMM` | `4` | 涂料設備以毫米為單位的高度。另請參閱[heightMM](qpaintdevice.html#heightMM)( ) 。 |
| `QPaintDevice.PdmNumColors` | `5` | 不同顏色可供油漆設備的數量。另請參閱[colorCount](qpaintdevice.html#colorCount)( ) 。 |
| `QPaintDevice.PdmDepth` | `6` | 繪制設備的比特深度(位平面的數量)。另請參閱[depth](qpaintdevice.html#depth)( ) 。 |
| `QPaintDevice.PdmDpiX` | `7` | 該設備每英寸的點數的水平分辨率。另請參閱[logicalDpiX](qpaintdevice.html#logicalDpiX)( ) 。 |
| `QPaintDevice.PdmDpiY` | `8` | 該設備每英寸的點數的垂直分辨率。另請參閱[logicalDpiY](qpaintdevice.html#logicalDpiY)( ) 。 |
| `QPaintDevice.PdmPhysicalDpiX` | `9` | 該設備每英寸的點數的水平分辨率。另請參閱[physicalDpiX](qpaintdevice.html#physicalDpiX)( ) 。 |
| `QPaintDevice.PdmPhysicalDpiY` | `10` | 該設備每英寸的點數的垂直分辨率。另請參閱[physicalDpiY](qpaintdevice.html#physicalDpiY)( ) 。 |
**See also** [metric](qpaintdevice.html#metric)( ) 。
* * *
## Method Documentation
```
QPaintDevice.__init__ (self)
```
構造一個繪圖設備。此構造函數只能從子類調用[QPaintDevice](qpaintdevice.html)。
```
int QPaintDevice.colorCount (self)
```
返回不同的顏色可供繪制設備的數量。因為這個值是一個整數,它不會是足以代表在32位顯示的顏色的數量,在這種情況下INT_MAX被返回來代替。
```
int QPaintDevice.depth (self)
```
返回繪制設備的比特深度(位平面的數量)。
```
int QPaintDevice.height (self)
```
返回繪制設備的默認高度坐標系統的單位(如像素[QPixmap](qpixmap.html)和[QWidget](qwidget.html)) 。
**See also** [heightMM](qpaintdevice.html#heightMM)( ) 。
```
int QPaintDevice.heightMM (self)
```
返回漆裝置以毫米為單位的高度。由于平臺的限制,它可能無法使用這個函數來確定屏幕上的一個小部件的實際物理尺寸。
**See also** [height](qpaintdevice.html#height)( ) 。
```
int QPaintDevice.logicalDpiX (self)
```
返回以每英寸點數,這是計算的字體大小時使用的設備的水平分辨率。為X11 ,這通常是因為可以從計算同一[widthMM](qpaintdevice.html#widthMM)( ) 。
請注意,如果logicalDpiX ( )不等于[physicalDpiX](qpaintdevice.html#physicalDpiX)()時,相應的[QPaintEngine](qpaintengine.html)必須處理分辨率的映射。
**See also** [logicalDpiY](qpaintdevice.html#logicalDpiY)()和[physicalDpiX](qpaintdevice.html#physicalDpiX)( ) 。
```
int QPaintDevice.logicalDpiY (self)
```
返回以每英寸點數,這是計算的字體大小時使用的設備的垂直分辨率。為X11 ,這通常是因為可以從計算同一[heightMM](qpaintdevice.html#heightMM)( ) 。
請注意,如果logicalDpiY ( )不等于[physicalDpiY](qpaintdevice.html#physicalDpiY)()時,相應的[QPaintEngine](qpaintengine.html)必須處理分辨率的映射。
**See also** [logicalDpiX](qpaintdevice.html#logicalDpiX)()和[physicalDpiY](qpaintdevice.html#physicalDpiY)( ) 。
```
int QPaintDevice.metric (self, PaintDeviceMetric?metric)
```
返回度量信息對于給定的涂料設備_metric_。
**See also** [PaintDeviceMetric](qpaintdevice.html#PaintDeviceMetric-enum)。
```
int QPaintDevice.numColors (self)
```
此功能已被棄用。
使用[colorCount](qpaintdevice.html#colorCount)( )來代替。
返回不同的顏色可供繪制設備的數量。因為這個值是一個整數,它不會是足以代表在32位顯示的顏色的數量,在這種情況下INT_MAX被返回來代替。
```
QPaintEngine QPaintDevice.paintEngine (self)
```
[
這種方法是抽象的,應在任何子類中重新實現。
返回一個指針,指向繪圖引擎用于在設備上繪制。
```
bool QPaintDevice.paintingActive (self)
```
](qpaintengine.html)
[如果返回設備當前正在繪制的,即有人叫真](qpaintengine.html)[QPainter.begin](qpainter.html#begin)(),但尚未被稱為[QPainter.end](qpainter.html#end)( )此設備,否則返回False 。
**See also** [QPainter.isActive](qpainter.html#isActive)( ) 。
```
int QPaintDevice.physicalDpiX (self)
```
返回以每英寸點數設備的水平分辨率。例如,在打印時,這項決議是指物理打印機的分辨率。在另一方面的邏輯DPI ,是指所使用的實際繪圖引擎的分辨率。
請注意,如果physicalDpiX ( )不等于[logicalDpiX](qpaintdevice.html#logicalDpiX)()時,相應的[QPaintEngine](qpaintengine.html)必須處理分辨率的映射。
**See also** [physicalDpiY](qpaintdevice.html#physicalDpiY)()和[logicalDpiX](qpaintdevice.html#logicalDpiX)( ) 。
```
int QPaintDevice.physicalDpiY (self)
```
返回以每英寸點數設備的水平分辨率。例如,在打印時,這項決議是指物理打印機的分辨率。在另一方面的邏輯DPI ,是指所使用的實際繪圖引擎的分辨率。
請注意,如果physicalDpiY ( )不等于[logicalDpiY](qpaintdevice.html#logicalDpiY)()時,相應的[QPaintEngine](qpaintengine.html)必須處理分辨率的映射。
**See also** [physicalDpiX](qpaintdevice.html#physicalDpiX)()和[logicalDpiY](qpaintdevice.html#logicalDpiY)( ) 。
```
int QPaintDevice.width (self)
```
返回繪制設備的默認寬度坐標系單位(如像素[QPixmap](qpixmap.html)和[QWidget](qwidget.html)) 。
**See also** [widthMM](qpaintdevice.html#widthMM)( ) 。
```
int QPaintDevice.widthMM (self)
```
返回漆裝置以毫米為單位的寬度。由于平臺的限制,它可能無法使用這個函數來確定屏幕上的一個小部件的實際物理尺寸。
**See also** [width](qpaintdevice.html#width)( ) 。
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- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文檔翻譯:Qt樣式單參考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
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- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
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- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
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- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
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- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
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- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference