python3+PyQt5实现柱状图

yipeiwu_com6年前Python基础

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:

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持【听图阁-专注于Python设计】。

相关文章

在PyCharm中控制台输出日志分层级分颜色显示的方法

1、把下面代码复制到一个.py文件中 #!/usr/bin/env python # encoding: utf-8 import logging # now we patch...

Python3.5内置模块之time与datetime模块用法实例分析

Python3.5内置模块之time与datetime模块用法实例分析

本文实例讲述了Python3.5内置模块之time与datetime模块用法。分享给大家供大家参考,具体如下: 1、模块的分类 a、标准库(Python自带):sys、os模块 b、开...

python GUI图形化编程wxpython的使用

python GUI图形化编程wxpython的使用

一、python gui(图形化)模块介绍:   Tkinter :是python最简单的图形化模块,总共只有14种组建   Pyqt :是python最复杂也是使用最广泛的图形化   ...

python的几种开发工具介绍

1 IDLE1.1 IDLE是python创初人Guido van Rossum使用python and Tkinter来创建的一个集成开发环境。要使用IDLE必须安装python an...

python中cPickle用法例子分享

在python中,一般可以使用pickle类来进行python对象的序列化,而cPickle提供了一个更快速简单的接口,如python文档所说的:“cPickle -- A faster...