用画笔画画-尊龙凯时

问题描述

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("")
    self.parent.unbind("")
    self.parent.bind("", self.button_press)
    self.parent.bind('', self.draw_pencil_move)
    self.parent.bind('', 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:

推荐答案

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_())