import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)
from PyQt4 import QtCore, QtGui
class ScribbleArea(QtGui.QWidget):
def __init__(self, parent=None):
super(ScribbleArea, self).__init__(parent)
self.setAttribute(QtCore.Qt.WA_StaticContents)
self.modified = False
self.scribbling = False
self.myPenWidth = 1
self.myPenColor = QtCore.Qt.blue
self.image = QtGui.QImage()
self.lastPoint = QtCore.QPoint()
def openImage(self, fileName):
loadedImage = QtGui.QImage()
if not loadedImage.load(fileName):
return False
newSize = loadedImage.size().expandedTo(self.size())
self.resizeImage(loadedImage, newSize)
self.image = loadedImage
self.modified = False
self.update()
return True
def saveImage(self, fileName, fileFormat):
visibleImage = self.image
self.resizeImage(visibleImage, self.size())
if visibleImage.save(fileName, fileFormat):
self.modified = False
return True
else:
return False
def setPenColor(self, newColor):
self.myPenColor = newColor
def setPenWidth(self, newWidth):
self.myPenWidth = newWidth
def clearImage(self):
self.image.fill(QtGui.qRgb(255, 255, 255))
self.modified = True
self.update()
def mousePressEvent(self, event):
if event.button() == QtCore.Qt.LeftButton:
self.lastPoint = event.pos()
self.scribbling = True
def mouseMoveEvent(self, event):
if (event.buttons() & QtCore.Qt.LeftButton) and self.scribbling:
self.drawLineTo(event.pos())
def mouseReleaseEvent(self, event):
if event.button() == QtCore.Qt.LeftButton and self.scribbling:
self.drawLineTo(event.pos())
self.scribbling = False
def paintEvent(self, event):
painter = QtGui.QPainter(self)
painter.drawImage(event.rect(), self.image)
def resizeEvent(self, event):
if self.width() > self.image.width() or self.height() > self.image.height():
newWidth = max(self.width() + 128, self.image.width())
newHeight = max(self.height() + 128, self.image.height())
self.resizeImage(self.image, QtCore.QSize(newWidth, newHeight))
self.update()
super(ScribbleArea, self).resizeEvent(event)
def drawLineTo(self, endPoint):
painter = QtGui.QPainter(self.image)
painter.setPen(QtGui.QPen(self.myPenColor, self.myPenWidth,
QtCore.Qt.SolidLine, QtCore.Qt.RoundCap, QtCore.Qt.RoundJoin))
painter.drawLine(self.lastPoint, endPoint)
self.modified = True
rad = self.myPenWidth / 2 + 2
self.update(QtCore.QRect(self.lastPoint, endPoint).normalized().adjusted(-rad, -rad, +rad, +rad))
self.lastPoint = QtCore.QPoint(endPoint)
def resizeImage(self, image, newSize):
if image.size() == newSize:
return
newImage = QtGui.QImage(newSize, QtGui.QImage.Format_RGB32)
newImage.fill(QtGui.qRgb(255, 255, 255))
painter = QtGui.QPainter(newImage)
painter.drawImage(QtCore.QPoint(0, 0), image)
self.image = newImage
def print_(self):
printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
printDialog = QtGui.QPrintDialog(printer, self)
if printDialog.exec_() == QtGui.QDialog.Accepted:
painter = QtGui.QPainter(printer)
rect = painter.viewport()
size = self.image.size()
size.scale(rect.size(), QtCore.Qt.KeepAspectRatio)
painter.setViewport(rect.x(), rect.y(), size.width(), size.height())
painter.setWindow(self.image.rect())
painter.drawImage(0, 0, self.image)
painter.end()
def isModified(self):
return self.modified
def penColor(self):
return self.myPenColor
def penWidth(self):
return self.myPenWidth
class MainWindow(QtGui.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.saveAsActs = []
self.scribbleArea = ScribbleArea()
self.setCentralWidget(self.scribbleArea)
self.createActions()
self.createMenus()
self.setWindowTitle("Scribble")
self.resize(500, 500)
def closeEvent(self, event):
if self.maybeSave():
event.accept()
else:
event.ignore()
def open(self):
if self.maybeSave():
fileName = QtGui.QFileDialog.getOpenFileName(self, "Open File",
QtCore.QDir.currentPath())
if fileName:
self.scribbleArea.openImage(fileName)
def save(self):
action = self.sender()
fileFormat = action.data()
self.saveFile(fileFormat)
def penColor(self):
newColor = QtGui.QColorDialog.getColor(self.scribbleArea.penColor())
if newColor.isValid():
self.scribbleArea.setPenColor(newColor)
def penWidth(self):
newWidth, ok = QtGui.QInputDialog.getInteger(self, "Scribble",
"Select pen width:", self.scribbleArea.penWidth(), 1, 50, 1)
if ok:
self.scribbleArea.setPenWidth(newWidth)
def about(self):
QtGui.QMessageBox.about(self, "About Scribble",
"<p>The <b>Scribble</b> example shows how to use "
"QMainWindow as the base widget for an application, and how "
"to reimplement some of QWidget's event handlers to receive "
"the events generated for the application's widgets:</p>"
"<p> We reimplement the mouse event handlers to facilitate "
"drawing, the paint event handler to update the application "
"and the resize event handler to optimize the application's "
"appearance. In addition we reimplement the close event "
"handler to intercept the close events before terminating "
"the application.</p>"
"<p> The example also demonstrates how to use QPainter to "
"draw an image in real time, as well as to repaint "
"widgets.</p>")
def createActions(self):
self.openAct = QtGui.QAction("&Open...", self, shortcut="Ctrl+O",
triggered=self.open)
for format in QtGui.QImageWriter.supportedImageFormats():
format = str(format)
text = format.upper() + "..."
action = QtGui.QAction(text, self, triggered=self.save)
action.setData(format)
self.saveAsActs.append(action)
self.printAct = QtGui.QAction("&Print...", self,
triggered=self.scribbleArea.print_)
self.exitAct = QtGui.QAction("E&xit", self, shortcut="Ctrl+Q",
triggered=self.close)
self.penColorAct = QtGui.QAction("&Pen Color...", self,
triggered=self.penColor)
self.penWidthAct = QtGui.QAction("Pen &Width...", self,
triggered=self.penWidth)
self.clearScreenAct = QtGui.QAction("&Clear Screen", self,
shortcut="Ctrl+L", triggered=self.scribbleArea.clearImage)
self.aboutAct = QtGui.QAction("&About", self, triggered=self.about)
self.aboutQtAct = QtGui.QAction("About &Qt", self,
triggered=QtGui.qApp.aboutQt)
def createMenus(self):
self.saveAsMenu = QtGui.QMenu("&Save As", self)
for action in self.saveAsActs:
self.saveAsMenu.addAction(action)
fileMenu = QtGui.QMenu("&File", self)
fileMenu.addAction(self.openAct)
fileMenu.addMenu(self.saveAsMenu)
fileMenu.addAction(self.printAct)
fileMenu.addSeparator()
fileMenu.addAction(self.exitAct)
optionMenu = QtGui.QMenu("&Options", self)
optionMenu.addAction(self.penColorAct)
optionMenu.addAction(self.penWidthAct)
optionMenu.addSeparator()
optionMenu.addAction(self.clearScreenAct)
helpMenu = QtGui.QMenu("&Help", self)
helpMenu.addAction(self.aboutAct)
helpMenu.addAction(self.aboutQtAct)
self.menuBar().addMenu(fileMenu)
self.menuBar().addMenu(optionMenu)
self.menuBar().addMenu(helpMenu)
def maybeSave(self):
if self.scribbleArea.isModified():
ret = QtGui.QMessageBox.warning(self, "Scribble",
"The image has been modified.\n"
"Do you want to save your changes?",
QtGui.QMessageBox.Save | QtGui.QMessageBox.Discard |
QtGui.QMessageBox.Cancel)
if ret == QtGui.QMessageBox.Save:
return self.saveFile('png')
elif ret == QtGui.QMessageBox.Cancel:
return False
return True
def saveFile(self, fileFormat):
initialPath = QtCore.QDir.currentPath() + '/untitled.' + fileFormat
fileName = QtGui.QFileDialog.getSaveFileName(self, "Save As",
initialPath,
"%s Files (*.%s);;All Files (*)" % (fileFormat.upper(), fileFormat))
if fileName:
return self.scribbleArea.saveImage(fileName, fileFormat)
return False
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
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