Tkinter:使用鼠标绘制矩形
Tkinter: Draw rectangle using a mouse
请帮我解决这个问题。
我想允许用户使用鼠标在图片中的特定感兴趣区域周围绘制一个随机矩形(通过单击鼠标的右键或左键直到他释放它)。
我处理大图像(比我的屏幕分辨率大的图像,比如这个 one),所以用户需要滚动 window 才能看到图片完整。
这是我尝试显示大图片的代码,但我不知道如何允许用户使用鼠标在对象(比如图片中的人)上绘制矩形:
from Tkinter import *
import Image,ImageTk
root=Tk()
canv=Canvas(root,relief=SUNKEN)
sbarv=Scrollbar(root,orient=VERTICAL)
sbarh=Scrollbar(root,orien=HORIZONTAL)
sbarv.config(command=canv.yview)
sbarh.config(command=canv.xview)
canv.config(yscrollcommand=sbarv.set)
canv.config(xscrollcommand=sbarh.set)
canv.grid(row=0,column=0,sticky=N+S+E+W)
sbarv.grid(row=0,column=1,sticky=N+S)
sbarh.grid(row=1,column=0,sticky=E+W)
im=Image.open("image.jpg")
width,height=im.size
canv.config(scrollregion=(0,0,width,height))
im2=ImageTk.PhotoImage(im)
imgtag=canv.create_image(0,0,anchor="nw",image=im2)
root.mainloop()
编辑 1:
矩形不能被填充。我的意思是我只想画它的 4 条线(线段),但它里面必须是空的,我想只画一个像素宽度的轮廓。
我还想在光标移动(拖动)时绘制,而不是在按钮释放后绘制。
此外,请注意要绘制的矩形可能很长,我的意思是垂直滚动条需要向下移动才能划定整个感兴趣的对象(假设它是一个人)
任何帮助将不胜感激。
非常感谢您
编辑 2:
根据上面给我的 link,我对此进行了编码。我的问题是 滚动条没有出现 。也许有人能告诉我为什么?
请注意,在此代码中,我解决了 EDIT 1 中突出显示的第一个和第二个问题:
import PIL.Image
import Image
import ImageTk
from Tkinter import *
class ExampleApp(Frame):
def __init__(self,master):
Frame.__init__(self,master=None)
self.x = self.y = 0
self.canvas = Canvas(master, cursor="cross")
self.sbarv=Scrollbar(self,orient=VERTICAL)
self.sbarh=Scrollbar(self,orient=HORIZONTAL)
self.sbarv.config(command=self.canvas.yview)
self.sbarh.config(command=self.canvas.xview)
self.canvas.config(yscrollcommand=self.sbarv.set)
self.canvas.config(xscrollcommand=self.sbarh.set)
self.canvas.grid(row=0,column=0,sticky=N+S+E+W)
self.sbarv.grid(row=0,column=1,stick=N+S)
self.sbarh.grid(row=1,column=0,sticky=E+W)
self.canvas.bind("<ButtonPress-1>", self.on_button_press)
self.canvas.bind("<B1-Motion>", self.on_move_press)
self.canvas.bind("<ButtonRelease-1>", self.on_button_release)
self.rect = None
self.start_x = None
self.start_y = None
self.im = PIL.Image.open("logo.png")
self.wazil,self.lard=self.im.size
self.canvas.config(scrollregion=(0,0,self.wazil,self.lard))
self.tk_im = ImageTk.PhotoImage(self.im)
self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)
def on_button_press(self, event):
# save mouse drag start position
self.start_x = event.x
self.start_y = event.y
# create rectangle if not yet exist
#if not self.rect:
self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, fill="")
def on_move_press(self, event):
curX, curY = (event.x, event.y)
# expand rectangle as you drag the mouse
self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)
def on_button_release(self, event):
pass
if __name__ == "__main__":
root=Tk()
app = ExampleApp(root)
root.mainloop()
滚动条不显示,因为您 grid
将它们放入一个框架 (self.sbarv=Scrollbar(self, ...)
) 中,而您没有将其放入父 window。尽管 (self.canvas = Canvas(master, ...)
).
您直接将 Canvas 网格化到父 window 中
你应该做的也是将Canvas放入self
,然后使用
将Frame打包到master window中
app = ExampleApp(root)
app.pack()
但是,滚动时,event.x
和 event.y
不再代表 canvas 上的正确位置,因此您应该使用
self.start_x = self.canvas.canvasx(event.x)
self.start_y = self.canvas.canvasy(event.y)
和
curX = self.canvas.canvasx(event.x)
curY = self.canvas.canvasy(event.y)
那么,我了解到您想在鼠标拖动到 canvas 的边框之一时自动滚动 canvas?为此,您需要检查鼠标是否位于 canvas 的边缘之一,如果是,则向该方向滚动。您可以使用类似的东西:
w, h = self.canvas.winfo_width(), self.canvas.winfo_height()
if event.x > 0.9*w:
self.canvas.xview_scroll(1, 'units')
elif event.x < 0.1*w:
self.canvas.xview_scroll(-1, 'units')
if event.y > 0.9*h:
self.canvas.yview_scroll(1, 'units')
elif event.y < 0.1*h:
self.canvas.yview_scroll(-1, 'units')
因此,在您的代码中实现的所有内容变为:
import PIL.Image
import Image
import ImageTk
from Tkinter import *
class ExampleApp(Frame):
def __init__(self,master):
Frame.__init__(self,master=None)
self.x = self.y = 0
self.canvas = Canvas(self, cursor="cross")
self.sbarv=Scrollbar(self,orient=VERTICAL)
self.sbarh=Scrollbar(self,orient=HORIZONTAL)
self.sbarv.config(command=self.canvas.yview)
self.sbarh.config(command=self.canvas.xview)
self.canvas.config(yscrollcommand=self.sbarv.set)
self.canvas.config(xscrollcommand=self.sbarh.set)
self.canvas.grid(row=0,column=0,sticky=N+S+E+W)
self.sbarv.grid(row=0,column=1,stick=N+S)
self.sbarh.grid(row=1,column=0,sticky=E+W)
self.canvas.bind("<ButtonPress-1>", self.on_button_press)
self.canvas.bind("<B1-Motion>", self.on_move_press)
self.canvas.bind("<ButtonRelease-1>", self.on_button_release)
self.rect = None
self.start_x = None
self.start_y = None
self.im = PIL.Image.open("logo.png")
self.wazil,self.lard=self.im.size
self.canvas.config(scrollregion=(0,0,self.wazil,self.lard))
self.tk_im = ImageTk.PhotoImage(self.im)
self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)
def on_button_press(self, event):
# save mouse drag start position
self.start_x = self.canvas.canvasx(event.x)
self.start_y = self.canvas.canvasy(event.y)
# create rectangle if not yet exist
if not self.rect:
self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, outline='red')
def on_move_press(self, event):
curX = self.canvas.canvasx(event.x)
curY = self.canvas.canvasy(event.y)
w, h = self.canvas.winfo_width(), self.canvas.winfo_height()
if event.x > 0.9*w:
self.canvas.xview_scroll(1, 'units')
elif event.x < 0.1*w:
self.canvas.xview_scroll(-1, 'units')
if event.y > 0.9*h:
self.canvas.yview_scroll(1, 'units')
elif event.y < 0.1*h:
self.canvas.yview_scroll(-1, 'units')
# expand rectangle as you drag the mouse
self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)
def on_button_release(self, event):
pass
if __name__ == "__main__":
root=Tk()
app = ExampleApp(root)
app.pack()
root.mainloop()
请帮我解决这个问题。
我想允许用户使用鼠标在图片中的特定感兴趣区域周围绘制一个随机矩形(通过单击鼠标的右键或左键直到他释放它)。
我处理大图像(比我的屏幕分辨率大的图像,比如这个 one),所以用户需要滚动 window 才能看到图片完整。
这是我尝试显示大图片的代码,但我不知道如何允许用户使用鼠标在对象(比如图片中的人)上绘制矩形:
from Tkinter import *
import Image,ImageTk
root=Tk()
canv=Canvas(root,relief=SUNKEN)
sbarv=Scrollbar(root,orient=VERTICAL)
sbarh=Scrollbar(root,orien=HORIZONTAL)
sbarv.config(command=canv.yview)
sbarh.config(command=canv.xview)
canv.config(yscrollcommand=sbarv.set)
canv.config(xscrollcommand=sbarh.set)
canv.grid(row=0,column=0,sticky=N+S+E+W)
sbarv.grid(row=0,column=1,sticky=N+S)
sbarh.grid(row=1,column=0,sticky=E+W)
im=Image.open("image.jpg")
width,height=im.size
canv.config(scrollregion=(0,0,width,height))
im2=ImageTk.PhotoImage(im)
imgtag=canv.create_image(0,0,anchor="nw",image=im2)
root.mainloop()
编辑 1:
矩形不能被填充。我的意思是我只想画它的 4 条线(线段),但它里面必须是空的,我想只画一个像素宽度的轮廓。
我还想在光标移动(拖动)时绘制,而不是在按钮释放后绘制。
此外,请注意要绘制的矩形可能很长,我的意思是垂直滚动条需要向下移动才能划定整个感兴趣的对象(假设它是一个人)
任何帮助将不胜感激。
非常感谢您
编辑 2:
根据上面给我的 link,我对此进行了编码。我的问题是 滚动条没有出现 。也许有人能告诉我为什么?
请注意,在此代码中,我解决了 EDIT 1 中突出显示的第一个和第二个问题:
import PIL.Image
import Image
import ImageTk
from Tkinter import *
class ExampleApp(Frame):
def __init__(self,master):
Frame.__init__(self,master=None)
self.x = self.y = 0
self.canvas = Canvas(master, cursor="cross")
self.sbarv=Scrollbar(self,orient=VERTICAL)
self.sbarh=Scrollbar(self,orient=HORIZONTAL)
self.sbarv.config(command=self.canvas.yview)
self.sbarh.config(command=self.canvas.xview)
self.canvas.config(yscrollcommand=self.sbarv.set)
self.canvas.config(xscrollcommand=self.sbarh.set)
self.canvas.grid(row=0,column=0,sticky=N+S+E+W)
self.sbarv.grid(row=0,column=1,stick=N+S)
self.sbarh.grid(row=1,column=0,sticky=E+W)
self.canvas.bind("<ButtonPress-1>", self.on_button_press)
self.canvas.bind("<B1-Motion>", self.on_move_press)
self.canvas.bind("<ButtonRelease-1>", self.on_button_release)
self.rect = None
self.start_x = None
self.start_y = None
self.im = PIL.Image.open("logo.png")
self.wazil,self.lard=self.im.size
self.canvas.config(scrollregion=(0,0,self.wazil,self.lard))
self.tk_im = ImageTk.PhotoImage(self.im)
self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)
def on_button_press(self, event):
# save mouse drag start position
self.start_x = event.x
self.start_y = event.y
# create rectangle if not yet exist
#if not self.rect:
self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, fill="")
def on_move_press(self, event):
curX, curY = (event.x, event.y)
# expand rectangle as you drag the mouse
self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)
def on_button_release(self, event):
pass
if __name__ == "__main__":
root=Tk()
app = ExampleApp(root)
root.mainloop()
滚动条不显示,因为您 grid
将它们放入一个框架 (self.sbarv=Scrollbar(self, ...)
) 中,而您没有将其放入父 window。尽管 (self.canvas = Canvas(master, ...)
).
你应该做的也是将Canvas放入self
,然后使用
app = ExampleApp(root)
app.pack()
但是,滚动时,event.x
和 event.y
不再代表 canvas 上的正确位置,因此您应该使用
self.start_x = self.canvas.canvasx(event.x)
self.start_y = self.canvas.canvasy(event.y)
和
curX = self.canvas.canvasx(event.x)
curY = self.canvas.canvasy(event.y)
那么,我了解到您想在鼠标拖动到 canvas 的边框之一时自动滚动 canvas?为此,您需要检查鼠标是否位于 canvas 的边缘之一,如果是,则向该方向滚动。您可以使用类似的东西:
w, h = self.canvas.winfo_width(), self.canvas.winfo_height()
if event.x > 0.9*w:
self.canvas.xview_scroll(1, 'units')
elif event.x < 0.1*w:
self.canvas.xview_scroll(-1, 'units')
if event.y > 0.9*h:
self.canvas.yview_scroll(1, 'units')
elif event.y < 0.1*h:
self.canvas.yview_scroll(-1, 'units')
因此,在您的代码中实现的所有内容变为:
import PIL.Image
import Image
import ImageTk
from Tkinter import *
class ExampleApp(Frame):
def __init__(self,master):
Frame.__init__(self,master=None)
self.x = self.y = 0
self.canvas = Canvas(self, cursor="cross")
self.sbarv=Scrollbar(self,orient=VERTICAL)
self.sbarh=Scrollbar(self,orient=HORIZONTAL)
self.sbarv.config(command=self.canvas.yview)
self.sbarh.config(command=self.canvas.xview)
self.canvas.config(yscrollcommand=self.sbarv.set)
self.canvas.config(xscrollcommand=self.sbarh.set)
self.canvas.grid(row=0,column=0,sticky=N+S+E+W)
self.sbarv.grid(row=0,column=1,stick=N+S)
self.sbarh.grid(row=1,column=0,sticky=E+W)
self.canvas.bind("<ButtonPress-1>", self.on_button_press)
self.canvas.bind("<B1-Motion>", self.on_move_press)
self.canvas.bind("<ButtonRelease-1>", self.on_button_release)
self.rect = None
self.start_x = None
self.start_y = None
self.im = PIL.Image.open("logo.png")
self.wazil,self.lard=self.im.size
self.canvas.config(scrollregion=(0,0,self.wazil,self.lard))
self.tk_im = ImageTk.PhotoImage(self.im)
self.canvas.create_image(0,0,anchor="nw",image=self.tk_im)
def on_button_press(self, event):
# save mouse drag start position
self.start_x = self.canvas.canvasx(event.x)
self.start_y = self.canvas.canvasy(event.y)
# create rectangle if not yet exist
if not self.rect:
self.rect = self.canvas.create_rectangle(self.x, self.y, 1, 1, outline='red')
def on_move_press(self, event):
curX = self.canvas.canvasx(event.x)
curY = self.canvas.canvasy(event.y)
w, h = self.canvas.winfo_width(), self.canvas.winfo_height()
if event.x > 0.9*w:
self.canvas.xview_scroll(1, 'units')
elif event.x < 0.1*w:
self.canvas.xview_scroll(-1, 'units')
if event.y > 0.9*h:
self.canvas.yview_scroll(1, 'units')
elif event.y < 0.1*h:
self.canvas.yview_scroll(-1, 'units')
# expand rectangle as you drag the mouse
self.canvas.coords(self.rect, self.start_x, self.start_y, curX, curY)
def on_button_release(self, event):
pass
if __name__ == "__main__":
root=Tk()
app = ExampleApp(root)
app.pack()
root.mainloop()