QPicture ¶

概要 ¶

详细描述 ¶

图片以独立于平台的格式将描绘器命令序列化到 IO 设备。它们有时被称为元文件。

Qt pictures use a proprietary binary format. Unlike native picture (meta-file) formats on many window systems, Qt pictures have no limitations regarding their contents. Everything that can be painted on a widget or pixmap (e.g., fonts, pixmaps, regions, transformed graphics, etc.) can also be stored in a picture.

QPicture is resolution independent, i.e. a QPicture can be displayed on different devices (for example svg, pdf, ps, printer and screen) looking the same. This is, for instance, needed for WYSIWYG print preview. QPicture runs in the default system dpi, and scales the painter to match differences in resolution depending on the window system.

Example of how to record a picture:

picture = QPicture()
painter = QPainter()
painter.begin(picture)            # paint in picture
painter.drawEllipse(10,20, 80,70) # draw an ellipse
painter.end()                     # painting done
picture.save("drawing.pic")       # save picture
											

Note that the list of painter commands is reset on each call to the begin() 函数。

Example of how to replay a picture:

picture = QPicture()
picture.load("drawing.pic")           # load picture
painter = QPainter()
painter.begin(myImage)                # paint in myImage
painter.drawPicture(0, 0, picture)    # draw the picture at (0,0)
painter.end()                         # painting done
											

Pictures can also be drawn using play() . Some basic data about a picture is available, for example, size() , isNull() and boundingRect() .

另请参阅

QMovie

class QPicture ( arg__1 ) ¶

QPicture([formatVersion=-1])

param arg__1

QPicture

param formatVersion

int

Constructs an empty picture.

formatVersion parameter may be used to create a QPicture that can be read by applications that are compiled with earlier versions of Qt.

Note that the default formatVersion is -1 which signifies the current release, i.e. for Qt 4.0 a formatVersion of 7 is the same as the default formatVersion of -1.

Reading pictures generated by earlier versions of Qt is not supported in Qt 4.0.

PySide2.QtGui.QPicture. boundingRect ( ) ¶

返回类型

QRect

Returns the picture’s bounding rectangle or an invalid rectangle if the picture contains no data.

另请参阅

setBoundingRect()

PySide2.QtGui.QPicture. data ( ) ¶

返回类型

PyObject

Returns a pointer to the picture data. The pointer is only valid until the next non-const function is called on this picture. The returned pointer is 0 if the picture contains no data.

另请参阅

setData() size() isNull()

static PySide2.QtGui.QPicture. inputFormatList ( ) ¶

返回类型

字符串列表

注意

此函数被弃用。

Returns a list of picture formats that are supported for picture input.

Note that if you want to iterate over the list, you should iterate over a copy, e.g.

list = QPicture.inputFormatList()
for string in list:
    myProcessing(string)
											

另请参阅

outputFormatList() inputFormats() QPictureIO

static PySide2.QtGui.QPicture. inputFormats ( ) ¶

返回类型

注意

此函数被弃用。

Returns a list of picture formats that are supported for picture input.

另请参阅

outputFormats() inputFormatList() QPictureIO

PySide2.QtGui.QPicture. isNull ( ) ¶

返回类型

bool

返回 true if the picture contains no data; otherwise returns false.

PySide2.QtGui.QPicture. load ( dev [ , format=None ] ) ¶

参数

• dev – QIODevice

• format – str

返回类型

bool

这是重载函数。

dev is the device to use for loading.

PySide2.QtGui.QPicture. load ( fileName [ , format=None ] ) ¶

参数

• fileName – unicode

• format – str

返回类型

bool

static PySide2.QtGui.QPicture. outputFormatList ( ) ¶

返回类型

字符串列表

注意

此函数被弃用。

Returns a list of picture formats that are supported for picture output.

Note that if you want to iterate over the list, you should iterate over a copy, e.g.

list = QPicture.outputFormatList()
for string in list:
    myProcessing(string)
											

另请参阅

inputFormatList() outputFormats() QPictureIO

static PySide2.QtGui.QPicture. outputFormats ( ) ¶

返回类型

注意

此函数被弃用。

Returns a list of picture formats that are supported for picture output.

另请参阅

inputFormats() outputFormatList() QPictureIO

static PySide2.QtGui.QPicture. pictureFormat ( fileName ) ¶

参数

fileName – unicode

返回类型

str

注意

此函数被弃用。

Returns a string that specifies the picture format of the file fileName ，或 None if the file cannot be read or if the format is not recognized.

另请参阅

load() save()

PySide2.QtGui.QPicture. play ( p ) ¶

参数

p – QPainter

返回类型

bool

Replays the picture using painter ，并返回 true 若成功；否则返回 false .

This function does exactly the same as drawPicture() with (x, y) = (0, 0).

PySide2.QtGui.QPicture. save ( dev [ , format=None ] ) ¶

参数

• dev – QIODevice

• format – str

返回类型

bool

这是重载函数。

dev is the device to use for saving.

PySide2.QtGui.QPicture. save ( fileName [ , format=None ] ) ¶

参数

• fileName – unicode

• format – str

返回类型

bool

PySide2.QtGui.QPicture. setBoundingRect ( r ) ¶

参数

r – QRect

Sets the picture’s bounding rectangle to r . The automatically calculated value is overridden.

另请参阅

boundingRect()

PySide2.QtGui.QPicture. setData ( data ) ¶

参数

data – str

Sets the picture data directly from data and size . This function copies the input data.

另请参阅

data() size()

PySide2.QtGui.QPicture. size ( ) ¶

返回类型

uint

Returns the size of the picture data.

另请参阅

data()

PySide2.QtGui.QPicture. swap ( other ) ¶

参数

other – QPicture

Swaps picture other with this picture. This operation is very fast and never fails.