pyqtgraph 中窗口的最小化调整了包含对象的大小，但它应该只显示图形的较小范围

Posted 2023-03-25

【中文标题】pyqtgraph 中窗口的最小化调整了包含对象的大小，但它应该只显示图形的较小范围

【英文标题】：Minimizing of window in pyqtgraph resizes contained objects, but it should show just a smaller range of the graph

【发布时间】：2021-10-04 21:16:04

【问题描述】：

我目前正在做一个项目，该项目在 pyqtgraph 中显示矩形对象。当我最小化我的窗口时，包含的对象也将被调整大小，以便所有对象仍然可见。我的问题是我希望对象保持它们的大小，并且只显示整个图表的较小范围。有什么想法可以解决我的问题吗？

原始 - 图片：

最小化 - 图片：

代码sn-p：

import pyqtgraph as pg
from pyqtgraph import QtCore, QtGui
from PyQt5.QtGui import QFont

data = [(100, 100), (100, 550), (350,100), (350,550)]

# Creating Rectangle objects

class Rect(pg.GraphicsObject):
    def __init__(self, data):
        pg.GraphicsObject.__init__(self)
        self.data = data
        self.generatePicture()
    
    def generatePicture(self):
        ## pre-computing a QPicture object allows paint() to run much more quickly, 
        self.picture = QtGui.QPicture()
        self.p = QtGui.QPainter(self.picture)
        self.p.setFont(QFont("times",50))
        self.p.setPen(pg.mkPen('b'))
        self.p.setBrush(pg.mkBrush('g')) 
        for index in self.data:
            self.p.drawRect(QtCore.QRectF(index[0],index[1],250,450))
        self.p.end()
        
    
    def paint(self, p, *args):
        p.drawPicture(0, 0, self.picture)
        
    def boundingRect(self):
        return QtCore.QRectF(self.picture.boundingRect())

    
pg.setConfigOption('background', 'w')
pg.setConfigOption('foreground', 'k')
  
w = pg.GraphicsWindow()
w.setWindowTitle('Rectangle - Display')
v = w.addViewBox()
v.setAspectLocked()
w.setGeometry(100, 100, 1000, 900)

v.addItem(Rect(data))

## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
    import sys
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

【参考方案1】：

一种可能的解决方案是使用 QScrollArea 作为容器小部件，并且 GraphicsWindow 可以具有固定大小，那么只会更改 QScrollArea 的大小。

import pyqtgraph as pg
from pyqtgraph import QtCore, QtGui

data = [(100, 100), (100, 550), (350, 100), (350, 550)]

# Creating Rectangle objects


class Rect(pg.GraphicsObject):
    def __init__(self, data):
        pg.GraphicsObject.__init__(self)
        self.data = data
        self.generatePicture()

    def generatePicture(self):
        ## pre-computing a QPicture object allows paint() to run much more quickly,
        self.picture = QtGui.QPicture()
        p = QtGui.QPainter(self.picture)
        p.setFont(QtGui.QFont("times", 50))
        p.setPen(pg.mkPen("b"))
        p.setBrush(pg.mkBrush("g"))
        for index in self.data:
            p.drawRect(QtCore.QRectF(*index, 250, 450))
        p.end()

    def paint(self, p, *args):
        p.drawPicture(0, 0, self.picture)

    def boundingRect(self):
        return QtCore.QRectF(self.picture.boundingRect())


pg.setConfigOption("background", "w")
pg.setConfigOption("foreground", "k")


w = pg.GraphicsWindow()
w.setWindowTitle("Rectangle - Display")
v = w.addViewBox()
# Disable the zoom implemented by the mouse wheel
v.setMouseEnabled(x=False, y=False)
v.setAspectLocked()
w.setFixedSize(1000, 900)

v.addItem(Rect(data))

scroll_area = QtGui.QScrollArea()
scroll_area.setWidget(w)
scroll_area.setGeometry(100, 100, 1000, 900)
scroll_area.show()

## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == "__main__":
    import sys

    if (sys.flags.interactive != 1) or not hasattr(QtCore, "PYQT_VERSION"):
        QtGui.QApplication.instance().exec_()