PyQt对话框，控件（实例：绘图——简单画板工具）
PyQt对话框，控件（实例：绘图——简单画板工具）
- 作业描述
- 成果展示
- 全解python代码实现
- 全解代码截图
- 全解代码
作业描述
成果展示
全解python代码实现
全解代码截图
全解代码
import os
import sys
import PyQt5.QtCore as qc
import PyQt5.QtGui as qg
import PyQt5.QtWidgets as qw
class SetPenColorDlg(qw.QDialog):
#重载构造函数
def __init__(self,parent = None):
#重载父类构造函数
super().__init__(parent)
#改变窗口显示的title
self.setWindowTitle("SetPenWidth")
#red设置的Label
self.RLabel = qw.QLabel("Red :")
#red的数字框
self.RSpinBox = qw.QDoubleSpinBox(self)
#范围
self.RSpinBox.setRange(0,255)
#初始值
self.RSpinBox.setValue(255)
#green设置的Label
self.GLabel = qw.QLabel("Green :")
#green的数字框
self.GSpinBox = qw.QDoubleSpinBox(self)
#范围
self.GSpinBox.setRange(0,255)
#初始值
self.GSpinBox.setValue(255)
#blue设置的Label
self.BLabel = qw.QLabel("Blue :")
#blue的数字框
self.BSpinBox = qw.QDoubleSpinBox(self)
#范围
self.BSpinBox.setRange(0,255)
#初始值
self.BSpinBox.setValue(255)
#Color Lable
self.ColorLabel = qw.QLabel("Color :")
self.resultLabel = qw.QLabel("255,255,255")
#ok/cancel
self.okButton = qw.QPushButton("&OK")
self.cancelButton = qw.QPushButton("Cancel")
#显示，竖直布局
self.layout = qw.QGridLayout(self)
self.layout.addWidget(self.RLabel, 0, 0)
self.layout.addWidget(self.RSpinBox, 0, 1)
self.layout.addWidget(self.GLabel, 1, 0)
self.layout.addWidget(self.GSpinBox, 1, 1)
self.layout.addWidget(self.BLabel, 2, 0)
self.layout.addWidget(self.BSpinBox, 2, 1)
self.layout.addWidget(self.okButton, 3, 0)
self.layout.addWidget(self.cancelButton, 3, 1)
self.okButton.clicked.connect(self.accept)
self.cancelButton.clicked.connect(self.reject)
class SetPenWidthDlg(qw.QDialog):
#重载构造函数
def __init__(self,parent = None):
#重载父类构造函数
super().__init__(parent)
#改变窗口显示的title
self.setWindowTitle("SetPenWidth")
#设置width的Label
self.widthLabel = qw.QLabel("Width :")
#width的数字框
self.widthSpinBox = qw.QDoubleSpinBox(self)
#范围
self.widthSpinBox.setRange(1,30)
#初始值
self.widthSpinBox.setValue(3)
#ok/cancel
self.okButton = qw.QPushButton("&OK")
self.cancelButton = qw.QPushButton("Cancel")
#显示，竖直布局
self.layout = qw.QGridLayout(self)
self.layout.addWidget(self.widthLabel, 0, 0)
self.layout.addWidget(self.widthSpinBox, 0, 1)
self.layout.addWidget(self.okButton, 1, 0)
self.layout.addWidget(self.cancelButton, 1, 1)
self.okButton.clicked.connect(self.accept)
self.cancelButton.clicked.connect(self.reject)
#新建一个主窗口程序，继承自QMainWindow
class myMainWindow(qw.QMainWindow):
#重载构造函数
def __init__(self,parent = None):
#重载父类构造函数
super().__init__(parent)
#改变窗口显示的title
self.setWindowTitle("PaintBrush")
#加载数据
self.initData()
#加载画板
self.myLabel = qw.QLabel()
self.myPixmap = qg.QPixmap(qc.QSize(1000,800))
self.myPixmap.fill(qc.Qt.white)
self.myLabel.setPixmap(self.myPixmap)
self.initView()
#动作组
#徒手画
self.drawLineAction = qw.QAction(qg.QIcon("draw.png"), "&Draw.", self)
self.drawLineAction.triggered.connect(self.drawLine)
self.drawLineAction.setStatusTip("Draw.")
#设置颜色
self.setColorAction = qw.QAction(qg.QIcon("color.png"), "&set color.", self)
self.setColorAction.triggered.connect(self.setColor)
self.setColorAction.setStatusTip("set color.")
#设置线宽
self.setWidthAction = qw.QAction(qg.QIcon("width.png"), "&set width.", self)
self.setWidthAction.triggered.connect(self.setWidth)
self.setWidthAction.setStatusTip("set width.")
#打开文件
self.fileOpenAction = qw.QAction(qg.QIcon("open.png"), "&Open an image.", self)
self.fileOpenAction.triggered.connect(self.openFile)
self.fileOpenAction.setShortcut(qg.QKeySequence.Open)
self.fileOpenAction.setStatusTip("Open an image.")
#保存文件
self.fileSaveAction = qw.QAction(qg.QIcon("save.png"), "&Save an image.", self)
self.fileSaveAction.triggered.connect(self.saveFile)
self.fileSaveAction.setShortcut(qg.QKeySequence.Save)
self.fileSaveAction.setStatusTip("Save an image.")
#清空
self.ClearAction = qw.QAction(qg.QIcon("clear.png"), "new a paper.", self)
self.ClearAction.triggered.connect(self.initView)
self.ClearAction.setStatusTip("new a paper.")
#工具栏
self.fileToolbar = self.addToolBar("File")
self.fileToolbar.addAction(self.drawLineAction)
self.fileToolbar.addAction(self.setColorAction)
self.fileToolbar.addAction(self.setWidthAction)
self.fileToolbar.addAction(self.fileOpenAction)
self.fileToolbar.addAction(self.fileSaveAction)
self.fileToolbar.addAction(self.ClearAction)
#状态栏
#定义一个Label用来显示鼠标位置的更新
self.statusLabel = qw.QLabel("Moun")
#改变状态栏的Style
self.statusLabel.setFrameStyle(qw.QFrame.StyledPanel|qw.QFrame.Sunken)
#定义一个状态栏对象
self.status = self.statusBar()
#？？
self.status.setSizeGripEnabled(False)
#用addPermanentWidget()在状态栏显示Label里的内容
self.status.addPermanentWidget(self.statusLabel)
#在状态栏显示信息，后一个参数为显示时间（毫秒）
self.status.showMessage("Ready", 5000)
def initView(self):
#创建画板
#设置界面的尺寸为__size
self.Clear()
self.myLabel = qw.QLabel()
self.myPixmap = qg.QPixmap(qc.QSize(1000,800))
self.myPixmap.fill(qc.Qt.white)
self.myLabel.setPixmap(self.myPixmap)
#把图显示在中间
self.setCentralWidget(self.myLabel)
def drawLine(self):
self.pos_start = qc.QPoint(self.pos_start_X,self.pos_start_Y)
self.pos_end = qc.QPoint(self.pos_end_X,self.pos_end_Y)
self.painter = qg.QPainter(self.myPixmap)
self.painter.setPen(qg.QPen(qg.QColor(self.red,self.green,self.blue),self.pen_width))
self.painter.drawLine(self.pos_start,self.pos_end)
self.myLabel.setPixmap(self.myPixmap)
def setColor(self):
self.dialog_color = SetPenColorDlg(self)
#初始化上次保存的颜色值
self.dialog_color.RSpinBox.setValue(self.red)
self.dialog_color.GSpinBox.setValue(self.green)
self.dialog_color.BSpinBox.setValue(self.blue)
if self.dialog_color.exec_():
#获取RSpinBox中更新的数据
self.red = (int)(self.dialog_color.RSpinBox.value())
#获取GSpinBox中更新的数据
self.green = (int)(self.dialog_color.GSpinBox.value())
#获取BComboBox中更新的数据
self.blue = (int)(self.dialog_color.BSpinBox.value())
#把更新结果显示在resultLabel中
self.dialog_color.resultLabel.setText("{},{},{}".format(self.red, self.green, self.blue))
def setWidth(self):
self.dialog_width = SetPenWidthDlg(self)
#初始化上次保存的颜色值
self.dialog_width.widthSpinBox.setValue(self.pen_width)
if self.dialog_width.exec_():
self.pen_width = self.dialog_width.widthSpinBox.value()
#警告当前图像未保存
def okToContinue(self):
if self.dirty:
reply = qw.QMessageBox.question(self,
"Image Changer - Unsaved Changes",
"Save unsaved changes?",
qw.QMessageBox.Yes|qw.QMessageBox.No|qw.QMessageBox.Cancel)
if reply == qw.QMessageBox.Cancel:
return False
elif reply == qw.QMessageBox.Yes:
return self.fileSaveAs()
return True
def openFile(self):
if not self.okToContinue():
return
dir = (os.path.dirname(self.filename)
if self.filename is not None else ".")
formats = (["*.{}".format(format.data().decode("ascii").lower())
for format in qg.QImageReader.supportedImageFormats()])
fname = qw.QFileDialog.getOpenFileName(self,
"Image Changer - Choose Image", dir,
"Image files ({})".format(" ".join(formats)))
if fname:
print(1)
self.loadFile(fname[0])
print(2)
#self.painter = QPainter(self.pixmap)
print(3)
#self.painter.setPen(self.pen)
#self.updateFileMenu()
print(self.filename)
self.updatePainter()
print(type(self.filename))
def saveFile(self):
if self.image.isNull():
return True
fname = self.filename if self.filename is not None else "."
formats = (["*.{}".format(format.data().decode("ascii").lower())
for format in qg.QImageWriter.supportedImageFormats()])
fname = qw.QFileDialog.getSaveFileName(self,
"Image Changer - Save Image", fname,
"Image files ({})".format(" ".join(formats)))
fname = fname[0]
if fname:
print(fname)
if "." not in fname:
fname += ".png"
self.addRecentFile(fname)
self.filename = fname
if self.image.save(self.filename, None):
self.updateStatus("Saved as {}".format(self.filename))
self.dirty = False
return True
else:
self.updateStatus("Failed to save {}".format(
self.filename))
return False
return False
def loadFile(self, fname=None):
if fname is None:
action = self.sender()
if isinstance(action, qw.QAction):
fname = action.data()
if not self.okToContinue():
return
else:
return
if fname:
self.filename = None
image = qg.QImage(fname)
if image.isNull():
message = "Failed to read {}".format(fname)
else:
self.addRecentFile(fname)
self.image = qg.QImage()
self.image = image
self.filename = fname
self.showImage()
self.dirty = False
message = "Loaded {}".format(os.path.basename(fname))
self.updateStatus(message)
def addRecentFile(self, fname):
if fname is None:
return
if fname not in self.recentFiles:
if len(self.recentFiles) < 10:
self.recentFiles = [fname] + self.recentFiles
else:
self.recentFiles = [fname] + self.recentFiles[:8]
print(len(self.recentFiles))
def updateFileMenu(self):
self.fileMenu.clear()
self.fileMenu.addAction(self.fileOpenAction)
self.fileMenu.addAction(self.fileSaveAction)
current = self.filename
recentFiles = []
print(self.recentFiles)
for fname in self.recentFiles:
if fname != current and qc.QFile.exists(fname):
recentFiles.append(fname)
if recentFiles:
self.fileMenu.addSeparator()
for i, fname in enumerate(recentFiles):
action = qw.QAction(qg.QIcon("images/icon.png"),
"&{} {}".format(i + 1, qc.QFileInfo(
fname).fileName()), self)
action.setData(fname)
action.triggered.connect(lambda: self.loadFile(fname))
self.fileMenu.addAction(action)
def Clear(self):
#清空画板
self.myPixmap.fill(qc.Qt.white)
self.update()
self.dirty = False
def initData(self):
#参数
self.pos_start_X = 0
self.pos_start_Y = 0
self.pos_end_X = 0
self.pos_end_Y = 0
self.red = 255
self.green = 255
self.blue = 255
self.pen_width = 3
self.dirty = False
self.filename = None
self.recentFiles = []
#self.image = QImage()
def mousePressEvent(self,event):
print( "startx=",self.pos_start_X , " starty=",self.pos_start_Y)
self.pos_start = event.pos()
self.pos_start_X = event.pos().x()
self.pos_start_Y = event.pos().y()
def mouseMoveEvent(self,event):
self.pos_end_X = event.pos().x()
self.pos_end_Y = event.pos().y()
self.drawLine()
self.pos_start_X = event.pos().x()
self.pos_start_Y = event.pos().y()
def mouseReleaseEvent(self, event):
print( "endx=",self.pos_end_X , " endy=",self.pos_end_Y)
self.pos_end_X = event.pos().x()
self.pos_end_Y = event.pos().y()
self.drawLine()
def showImage(self, percent=None):
if self.image.isNull():
return
self.myPixmap = qg.QPixmap.fromImage(self.image)
self.myLabel.setPixmap(self.myPixmap)
app = qw.QApplication(sys.argv)
form = myMainWindow()
#设定最小的程序窗口大小
form.setMinimumSize(800,800)
form.show()
app.exec_()
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