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在我加入下面的簡單代碼中,有些東西我真的不明白。我使用pyqtgraph做了一個陰謀,我用新數據更新它(我試圖在這裏簡化它)。我做了原始數據的備份,以便使用撤消按鈕進行檢索。我不知道爲什麼當我更新我的數據時,我的歷史數組中的原始數據集也被替換了。有任何線索嗎?我找不到出路......嘗試使用pyqtgraph做一個簡單的撤消方法
馬洛
from PyQt4 import QtGui
import pyqtgraph as pg
import numpy as np
import sys
class SubWindow(QtGui.QDialog):
def __init__(self, parent=None):
super(SubWindow, self).__init__(parent)
self.dataHistory = []
self.plotItem()
self.button_undo = QtGui.QPushButton()
self.button_undo.setText('Undo')
self.button_changedata = QtGui.QPushButton()
self.button_changedata.setText('change_data')
layout = QtGui.QGridLayout()
layout.addWidget(self.button_changedata , 1, 1)
layout.addWidget(self.button_undo, 2, 1)
layout.addWidget(self.pw , 3, 1)
self.setLayout(layout)
self.button_changedata.clicked.connect(self.changedata)
self.button_undo .clicked.connect(self.undo)
def plotItem(self):
self.x = np.linspace(0.0, 10.0, num=10)
self.y = np.linspace(0.0, 10.0, num=10)
self.plt = pg.PlotDataItem(self.x, self.y)
self.vb = pg.ViewBox()
self.vb.addItem(self.plt)
self.pw = pg.PlotWidget(viewBox = self.vb)
###############################################
self.history(self.y)
###############################################
def changedata(self):
self.newData()
self.plt.setData(self.x, self.y_new)
def undo(self):
self.history(None)
self.plt.setData(self.x, self.y_old)
def newData(self):
self.y_new = self.dataHistory[-1]
self.y_new[0:3] = -999
self.history(self.y_new)
def history(self, new):
if new is not None:
self.dataHistory.append(new)
else:
if len(self.dataHistory) == 1:
self.y_old = self.dataHistory[-1]
else:
del self.dataHistory[-1]
self.y_old = self.dataHistory[-1]
###############################################
print self.dataHistory
###############################################
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
main = SubWindow()
main.resize(500,500)
main.move(app.desktop().screen().rect().center() - main.rect().center())
main.show()
sys.exit(app.exec_())