python3+PyQt5实现柱状图 - CSDN文库

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python3+PyQt5实现柱状图实现柱状图

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:

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