我想在我用Python設計的GUI上繪製圖像。完整的程序將從相機收集圖像數據,然後在GUI上顯示圖像。我已經探討了使用matplotlib,但它對於我的應用程序來說太慢了。我需要劇情更新速度相當快(最好儘可能快地從相機採集,一次半秒或二次)。這對pyqt來說是一個挑戰,因爲即使在使用QThread時,該圖也只能在主線程上更新,這會導致我的程序停止並且GUI無法被用戶訪問。將pyqtgraph多處理器實現爲一個pyqt小部件
我讀到pyqtgraph被認爲是比matplotlib快得多的繪圖庫。所以我試了一下並且喜歡它,但是它在顯示圖像時似乎與matplotlib存在相同的問題。它會停止整個GUI。我做了一些研究,發現了這個問題:Painting without paintEvent,其中一個答案提出使用QtProcess()。因此,我的問題是,是否有可能(如果是這樣,你是否可以提供一些示例代碼)在GUI中實現QtProcess(),即如何在單獨的進程中對GUI執行繪圖? (另外,如果有一種方法可以用matplotlib來做到這一點,那將非常有幫助。)
這是我設計用來測試我的問題的簡單示例。我從pyqtgraph的示例中獲取了一個示例腳本,並將一個pyqtgraph圖輸入到一個pyqt小部件中。然後當pushButton被按下時,它顯示的繪圖。如果您運行腳本,您會注意到第一個圖需要很長時間才能加載(6或7秒)。再次按下按鈕,它似乎加載速度更快。我正在做一個QThread()中的所有數據生成,但繪圖似乎要求主線程工作,即使它在QThread中完成。我想要做與本例中完全相同的事情,除了使用QtProcess()來處理繪圖。
歡迎任何其他關於繪圖或可能的替代方案的建議。由於
GUI腳本:
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'GUI.ui'
#
# Created: Fri Jun 28 14:40:22 2013
# by: PyQt4 UI code generator 4.9.5
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(800, 534)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.gridLayout_2 = QtGui.QGridLayout(self.centralwidget)
self.gridLayout_2.setObjectName(_fromUtf8("gridLayout_2"))
self.gridLayout = QtGui.QGridLayout()
self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
self.scrollArea = QtGui.QScrollArea(self.centralwidget)
self.scrollArea.setFrameShape(QtGui.QFrame.NoFrame)
self.scrollArea.setFrameShadow(QtGui.QFrame.Plain)
self.scrollArea.setWidgetResizable(True)
self.scrollArea.setObjectName(_fromUtf8("scrollArea"))
self.scrollAreaWidgetContents = QtGui.QWidget()
self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 780, 514))
self.scrollAreaWidgetContents.setObjectName(_fromUtf8("scrollAreaWidgetContents"))
self.widgetPlot = QtGui.QWidget(self.scrollAreaWidgetContents)
self.widgetPlot.setGeometry(QtCore.QRect(20, 10, 741, 451))
self.widgetPlot.setObjectName(_fromUtf8("widgetPlot"))
self.pushButtonPlot = QtGui.QPushButton(self.scrollAreaWidgetContents)
self.pushButtonPlot.setGeometry(QtCore.QRect(340, 480, 75, 23))
self.pushButtonPlot.setObjectName(_fromUtf8("pushButtonPlot"))
self.scrollArea.setWidget(self.scrollAreaWidgetContents)
self.gridLayout.addWidget(self.scrollArea, 1, 0, 1, 1)
self.gridLayout_2.addLayout(self.gridLayout, 0, 0, 1, 1)
MainWindow.setCentralWidget(self.centralwidget)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
self.pushButtonPlot.setText(QtGui.QApplication.translate("MainWindow", "Plot", None, QtGui.QApplication.UnicodeUTF8))
的包裝:
import numpy as np
import scipy
from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from GUI import Ui_MainWindow
class MyForm(QMainWindow):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.imv = pg.ImageView()
vbox = QVBoxLayout()
vbox.addWidget(self.imv)
self.ui.widgetPlot.setLayout(vbox)
self.plot_thread = plotData()
self.connect(self.ui.pushButtonPlot, SIGNAL("clicked()"), lambda : self.plot_thread.input(self.imv))
def threadPlot(self):
self.plot_thread.input(self.imv)
def plot(self):
## Create random 3D data set with noisy signals
self.img = scipy.ndimage.gaussian_filter(np.random.normal(size=(200, 200)), (5, 5)) * 20 + 100
self.img = self.img[np.newaxis,:,:]
decay = np.exp(-np.linspace(0,0.3,100))[:,np.newaxis,np.newaxis]
data = np.random.normal(size=(100, 200, 200))
data += self.img * decay
data += 2
## Add time-varying signal
sig = np.zeros(data.shape[0])
sig[30:] += np.exp(-np.linspace(1,10, 70))
sig[40:] += np.exp(-np.linspace(1,10, 60))
sig[70:] += np.exp(-np.linspace(1,10, 30))
sig = sig[:,np.newaxis,np.newaxis] * 3
data[:,50:60,50:60] += sig
self.imv.setImage(data, xvals=np.linspace(1., 3., data.shape[0]))
class plotData(QThread):
def __init__(self,parent=None):
QThread.__init__(self,parent)
self.exiting = False
def input(self, imv):
self.imv = imv
self.start()
def collectImage(self):
## Create random 3D data set with noisy signals
self.img = scipy.ndimage.gaussian_filter(np.random.normal(size=(200, 200)), (5, 5)) * 20 + 100
self.img = self.img[np.newaxis,:,:]
decay = np.exp(-np.linspace(0,0.3,100))[:,np.newaxis,np.newaxis]
data = np.random.normal(size=(100, 200, 200))
data += self.img * decay
data += 2
## Add time-varying signal
sig = np.zeros(data.shape[0])
sig[30:] += np.exp(-np.linspace(1,10, 70))
sig[40:] += np.exp(-np.linspace(1,10, 60))
sig[70:] += np.exp(-np.linspace(1,10, 30))
sig = sig[:,np.newaxis,np.newaxis] * 3
data[:,50:60,50:60] += sig
self.imv.setImage(data, xvals=np.linspace(1., 3., data.shape[0]))
def run(self):
self.collectImage()
self.emit(SIGNAL("Done"))
app = QApplication(sys.argv)
myapp = MyForm()
myapp.show()
sys.exit(app.exec_())
我試圖在嘗試使用QtProcess()(不成功的,我不知道如何導入一個QtProcess()部件到Qt GUI中):
import numpy as np
import scipy
from pyqtgraph.Qt import QtCore, QtGui
import pyqtgraph as pg
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from GUI import Ui_MainWindow
class MyForm(QMainWindow):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.proc = mp.QtProcess()
self.remotepg = self.proc._import('pyqtgraph')
self.win = self.remotepg.plot()
self.imv = self.win.plot([1,4,2,3], [4,6,3,4], pen=None, symbol='o')
vbox = QVBoxLayout()
vbox.addWidget(self.imv)
self.ui.widgetPlot.setLayout(vbox)
app = QApplication(sys.argv)
myapp = MyForm()
myapp.show()
sys.exit(app.exec_())