我需要关于在 PyQt5 上实现画笔的帮助我已经有了一些鼠标事件代码:
I need help with the implementation of the brush on PyQt5 I already have some event code for the mouse:
def mousePressEvent(self, event):
if event.button() and event.button() == Qt.LeftButton:
self.lastPoint = event.pos()
self.scribbling = True
def mouseMoveEvent(self, event):
if (event.buttons() & Qt.LeftButton) and self.scribbling:
self.drawLineTo(event.pos())
def mouseReleaseEvent(self, event):
if event.button() == Qt.LeftButton and self.scribbling:
self.drawLineTo(event.pos())
self.scribbling = False
其中声明了画笔绘制函数:
Inside of which the brush drawing function is declared:
def drawLineTo(self, endPoint):
painter = QPainter(self.image)
painter.setPen(QPen(self.myPenColor, self.myPenWidth, Qt.SolidLine,
Qt.RoundCap, Qt.RoundJoin))
painter.drawLine(self.lastPoint, endPoint)
self.modified = True
rad = self.myPenWidth / 2 + 2
self.update(QRect(self.lastPoint, endPoint).normalized().adjusted(-rad, -rad, +rad, +rad))
self.lastPoint = QPoint(endPoint)
但主要问题是这个函数是在事件本身中声明的.因此,绘图立即进行,我无法添加其他工具.因为与他们一起,铅笔"将不断被绘制.但是我需要以某种方式从那里拉出该功能并将其分配给相应的按钮.仅通过单击此按钮来包含.假设我有一些工具栏:
But the main problem is that this function is declared in the events themselves. Therefore, drawing goes immediately, and I can not add other tools. Because together with them the "pencil" will constantly be drawn. But I need to somehow pull out the function from there and assign it to the corresponding button. To include only by clicking on this button. Let's say I have some toolbar:
toolbar = self.addToolBar('Инструменты')
toolbar.addAction(self.pen)
有一个动作:
self.pen = QAction(QIcon('Image/pen.png'), 'Pencil', self)
self.pen.triggered.connect(self. )
我将如何在triggered.connect"中分配绘图功能,并且它仅在单击按钮时才起作用.也许这有一些联系,比如在 tkinter 中,在相似性中:
How would I do so in the "triggered.connect" assign the drawing function, and that it works only when the button is clicked. Maybe there are some bonds for this, like in tkinter, in the similarity:
def draw_pen(self):
self.parent.config(cursor="arrow")
self.parent.unbind("<Button-1>")
self.parent.unbind("<Motion>")
self.parent.bind("<ButtonPress-1>", self.button_press)
self.parent.bind('<B1-Motion>', self.draw_pencil_move)
self.parent.bind('<ButtonRelease-1>', self.draw_pencil_release)
最后,我只是将此功能分配给按钮,一切正常
And, in the end, I just assigned this function to the button, and everything worked fine
我将非常感谢您的回答,尤其是解决问题的示例或未在事件中声明的画笔示例
I will be very grateful for answers and especially for examples of solving problems or examples of brushes that are not declared in the events
附:如果有问题,我为我的英语道歉с:
P.S. I apologize for my English, if something is wrong с:
试试看:
import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
class MyScribbling(QMainWindow):
def __init__(self):
super().__init__()
self.penOn = QAction(QIcon('Image/ok.png'), 'Включить рисование', self)
self.penOn.triggered.connect(self.drawingOn)
self.penOff = QAction(QIcon('Image/exit.png'), 'ВЫКЛЮЧИТЬ рисование', self)
self.penOff.triggered.connect(self.drawingOff)
toolbar = self.addToolBar('Инструменты')
toolbar.addAction(self.penOn)
toolbar.addAction(self.penOff)
self.scribbling = False
self.myPenColor = Qt.red # +
self.myPenWidth = 3 # +
self.lastPoint = QPoint()
self.image = QPixmap("Image/picture.png")
self.setFixedSize(600, 600)
self.resize(self.image.width(), self.image.height())
self.show()
# +++
def paintEvent(self, event):
painter = QPainter(self)
painter.drawPixmap(self.rect(), self.image)
def mousePressEvent(self, event):
# if event.button() and event.button() == Qt.LeftButton: # -
if (event.button() == Qt.LeftButton) and self.scribbling: # +
self.lastPoint = event.pos()
# self.scribbling = True # -
def mouseMoveEvent(self, event):
if (event.buttons() & Qt.LeftButton) and self.scribbling:
# self.drawLineTo(event.pos()) # -
# +++
painter = QPainter(self.image)
painter.setPen(QPen(self.myPenColor, self.myPenWidth,
Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
painter.drawLine(self.lastPoint, event.pos())
# self.modified = True # ?
self.lastPoint = event.pos()
self.update()
# ?
#rad = self.myPenWidth / 2 + 2
#self.update(QRect(self.lastPoint, event.pos()).normalized().adjusted(-rad, -rad, +rad, +rad))
#self.lastPoint = QPoint(event.pos())
def mouseReleaseEvent(self, event):
if event.button() == Qt.LeftButton and self.scribbling:
#self.drawLineTo(event.pos())
#self.scribbling = False
pass
# Перенес в mouseMoveEvent
# def drawLineTo(self, endPoint):
# painter = QPainter(self.image)
# painter.setPen(QPen(self.myPenColor, self.myPenWidth, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
# painter.drawLine(self.lastPoint, endPoint)
# self.modified = True
# rad = self.myPenWidth / 2 + 2
# self.update(QRect(self.lastPoint, endPoint).normalized().adjusted(-rad, -rad, +rad, +rad))
# self.lastPoint = QPoint(endPoint)
# +++
def drawingOn(self):
self.scribbling = True
# +++
def drawingOff(self):
self.scribbling = False
if __name__ == '__main__':
app = QApplication(sys.argv)
mainMenu = MyScribbling()
sys.exit(app.exec_())
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