本篇文章為大家展示了怎么在python3中利用PyQt5實現(xiàn)一個柱狀圖,內(nèi)容簡明扼要并且容易理解,絕對能使你眼前一亮,通過這篇文章的詳細介紹希望你能有所收獲。
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#!/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_()
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