本文通过python3+pyqt5实现了python qt gui 快速编程的16章的excise例子。
#!/usr/bin/env python3 import random import sys from pyqt5.qtcore import (qabstractlistmodel, qabstracttablemodel, qmodelindex, qsize, qtimer, qvariant, qt,pyqtsignal) from pyqt5.qtwidgets import (qapplication, qdialog, qhboxlayout, qlistview, qspinbox, qstyleditemdelegate,qstyleoptionviewitem, qwidget) from pyqt5.qtgui import qcolor,qpainter,qpixmap class bargraphmodel(qabstractlistmodel): datachanged=pyqtsignal(qmodelindex,qmodelindex) def __init__(self): super(bargraphmodel, self).__init__() self.__data = [] self.__colors = {} self.minvalue = 0 self.maxvalue = 0 def rowcount(self, index=qmodelindex()): return len(self.__data) def insertrows(self, row, count): extra = row + count if extra >= len(self.__data): self.begininsertrows(qmodelindex(), row, row + count - 1) self.__data.extend([0] * (extra - len(self.__data) + 1)) self.endinsertrows() return true return false def flags(self, index): #return (qabstracttablemodel.flags(self, index)|qt.itemiseditable) return (qabstractlistmodel.flags(self, index)|qt.itemiseditable) def setdata(self, index, value, role=qt.displayrole): row = index.row() if not index.isvalid() or 0 > row >= len(self.__data): return false changed = false if role == qt.displayrole: value = value self.__data[row] = value if self.minvalue > value: self.minvalue = value if self.maxvalue < value: self.maxvalue = value changed = true elif role == qt.userrole: self.__colors[row] = value #self.emit(signal("datachanged(qmodelindex,qmodelindex)"), # index, index) self.datachanged[qmodelindex,qmodelindex].emit(index, index) changed = true if changed: #self.emit(signal("datachanged(qmodelindex,qmodelindex)"), # index, index) self.datachanged[qmodelindex,qmodelindex].emit(index, index) return changed def data(self, index, role=qt.displayrole): row = index.row() if not index.isvalid() or 0 > row >= len(self.__data): return qvariant() if role == qt.displayrole: return self.__data[row] if role == qt.userrole: return qvariant(self.__colors.get(row, qcolor(qt.red))) if role == qt.decorationrole: color = qcolor(self.__colors.get(row, qcolor(qt.red))) pixmap = qpixmap(20, 20) pixmap.fill(color) return qvariant(pixmap) return qvariant() class bargraphdelegate(qstyleditemdelegate): def __init__(self, minimum=0, maximum=100, parent=none): super(bargraphdelegate, self).__init__(parent) self.minimum = minimum self.maximum = maximum def paint(self, painter, option, index): myoption = qstyleoptionviewitem(option) myoption.displayalignment |= (qt.alignright|qt.alignvcenter) qstyleditemdelegate.paint(self, painter, myoption, index) def createeditor(self, parent, option, index): spinbox = qspinbox(parent) spinbox.setrange(self.minimum, self.maximum) spinbox.setalignment(qt.alignright|qt.alignvcenter) return spinbox def seteditordata(self, editor, index): value = index.model().data(index, qt.displayrole) editor.setvalue(value) def setmodeldata(self, editor, model, index): editor.interprettext() model.setdata(index, editor.value()) class bargraphview(qwidget): width = 20 def __init__(self, parent=none): super(bargraphview, self).__init__(parent) self.model = none def setmodel(self, model): self.model = model #self.connect(self.model, # signal("datachanged(qmodelindex,qmodelindex)"), # self.update) self.model.datachanged[qmodelindex,qmodelindex].connect(self.update) #self.connect(self.model, signal("modelreset()"), self.update) self.model.modelreset.connect(self.update) def sizehint(self): return self.minimumsizehint() def minimumsizehint(self): if self.model is none: return qsize(bargraphview.width * 10, 100) return qsize(bargraphview.width * self.model.rowcount(), 100) def paintevent(self, event): if self.model is none: return painter = qpainter(self) painter.setrenderhint(qpainter.antialiasing) span = self.model.maxvalue - self.model.minvalue painter.setwindow(0, 0, bargraphview.width * self.model.rowcount(), span) for row in range(self.model.rowcount()): x = row * bargraphview.width index = self.model.index(row) color = qcolor(self.model.data(index, qt.userrole)) y = self.model.data(index) painter.fillrect(x, span - y, bargraphview.width, y, color) class mainform(qdialog): def __init__(self, parent=none): super(mainform, self).__init__(parent) self.model = bargraphmodel() self.bargraphview = bargraphview() self.bargraphview.setmodel(self.model) self.listview = qlistview() self.listview.setmodel(self.model) self.listview.setitemdelegate(bargraphdelegate(0, 1000, self)) self.listview.setmaximumwidth(100) self.listview.setedittriggers(qlistview.doubleclicked| qlistview.editkeypressed) layout = qhboxlayout() layout.addwidget(self.listview) layout.addwidget(self.bargraphview, 1) self.setlayout(layout) self.setwindowtitle("bar grapher") qtimer.singleshot(0, self.initialload) def initialload(self): # generate fake data count = 20 self.model.insertrows(0, count - 1) for row in range(count): value = random.randint(1, 150) color = qcolor(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)) index = self.model.index(row) self.model.setdata(index, value) self.model.setdata(index, qvariant(color), qt.userrole) app = qapplication(sys.argv) form = mainform() form.resize(600, 400) form.show() app.exec_()
运行结果：
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以上就是python3+pyqt5实现柱状图的详细内容。