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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