就是可以在指定的起始点画线，可以拖曳动态显示直线
或者将下面的tkinter代码嵌入到pyqt5中
非常感谢
```python
#画图软件的实现
from tkinter.filedialog import *
from tkinter import *
from tkinter.colorchooser import *
win_width=900
win_height=450
class Application(Frame):
def __init__(self,master=None,bgcolor="#000000"):
super().__init__(master)
self.master=master
self.bgcolor=bgcolor
self.x=0
self.y=0
self.fgcolor="#ff0000"
self.lastDraw=0 #表示最后绘制的图形的id
self.startDrawFlag=False
self.pack()
self.createWidget()
def createWidget(self):
# 创建画板
self.drawCad=Canvas(self,width=win_width,height=win_height*0.9,bg=self.bgcolor)
self.drawCad.pack()
# 创建按钮
btn_start = Button(self,text="开始",name="start")
btn_start.pack(side="left",padx=10)
btn_pen = Button(self, text="画笔", name="pen")
btn_pen.pack(side="left", padx=10)
btn_rect = Button(self, text="矩形", name="rect")
btn_rect.pack(side="left", padx=10)
btn_clear = Button(self, text="清屏", name="clear")
btn_clear.pack(side="left", padx=10)
btn_earsor = Button(self, text="橡皮擦", name="earsor")
btn_earsor.pack(side="left", padx=10)
btn_line = Button(self, text="直线", name="line")
btn_line.pack(side="left", padx=10)
btn_lineArrow = Button(self, text="箭头直线", name="lineArrow")
btn_lineArrow.pack(side="left", padx=10)
btn_color = Button(self, text="颜色", name="color")
btn_color.pack(side="left", padx=10)
#为按钮绑定事件
btn_pen.bind_class("Button","<1>",self.eventManger)
self.drawCad.bind("<ButtonRelease-1>",self.stopDraw)
def eventManger(self,event):
name=event.widget.winfo_name()
print(name)
if name=="line" :
self.drawCad.bind("<B1-Motion>",self.myline)
elif name=="lineArrow":
self.drawCad.bind("<B1-Motion>", self.mylineArrow)
elif name=="rect":
self.drawCad.bind("<B1-Motion>", self.myRect)
elif name=="pen":
self.drawCad.bind("<B1-Motion>", self.myPen)
elif name=="earsor":
self.drawCad.bind("<B1-Motion>", self.myEarsor)
elif name=="clear":
self.drawCad.delete("all")
elif name=="color":
c= askcolor(color=self.fgcolor,title="画笔选择颜色")
self.fgcolor=c[1]
def myline(self,event):
self.startDraw(event)
self.lastDraw=self.drawCad.create_line(self.x,self.y,event.x,event.y,fill=self.fgcolor)
def mylineArrow(self,event):
self.startDraw(event)
self.lastDraw = self.drawCad.create_line(self.x, self.y, event.x, event.y,arrow=LAST , fill=self.fgcolor)
def myRect(self,event):
self.startDraw(event)
self.lastDraw = self.drawCad.create_rectangle(self.x, self.y, event.x, event.y, outline=self.fgcolor)
def myPen(self,event):
self.startDraw(event)
self.drawCad.create_rectangle(self.x, self.y, event.x, event.y, outline=self.fgcolor)
self.x=event.x
self.y=event.y
def myEarsor(self,event):
self.startDraw(event)
self.drawCad.create_rectangle(event.x-4, event.y-4, event.x+4, event.y+4, fill=self.bgcolor)
self.x = event.x
self.y = event.y
def stopDraw(self,event):
self.startDrawFlag=False
self.lastDraw=0
def startDraw(self,event):
self.drawCad.delete(self.lastDraw)
if not self.startDrawFlag:
self.startDrawFlag = True
self.x = event.x
self.y = event.y
root=Tk()
app=Application(root)
root.title("简易的画图工具")
root.geometry(str(win_width)+"x"+str(win_height)+"+100+100")
root.mainloop()
```