本篇文章為大家展示了怎么在python3中利用PyQt5實(shí)現(xiàn)一個(gè)柱狀圖，內(nèi)容簡(jiǎn)明扼要并且容易理解，絕對(duì)能使你眼前一亮，通過這篇文章的詳細(xì)介紹希望你能有所收獲。
Python主要應(yīng)用于：1、Web開發(fā)；2、數(shù)據(jù)科學(xué)研究；3、網(wǎng)絡(luò)爬蟲；4、嵌入式應(yīng)用開發(fā)；5、游戲開發(fā)；6、桌面應(yīng)用開發(fā)。
重慶分公司
重慶分公司
#!/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_()上述內(nèi)容就是怎么在python3中利用PyQt5實(shí)現(xiàn)一個(gè)柱狀圖，你們學(xué)到知識(shí)或技能了嗎？如果還想學(xué)到更多技能或者豐富自己的知識(shí)儲(chǔ)備，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
