如何显示图片并获得鼠标点击坐标

Question

我想知道在Python(Windows)中是否可以显示一些图片,然后用鼠标点击这张图片并获得相对于图片边缘的点击坐标.

谢谢!

Answer 1

是的,一旦你理解了tkinter,这是可能的,而且很简单,这是一个快速的脚本:

from Tkinter import *
from tkFileDialog import askopenfilename
import Image, ImageTk

if __name__ == "__main__":
    root = Tk()

    #setting up a tkinter canvas with scrollbars
    frame = Frame(root, bd=2, relief=SUNKEN)
    frame.grid_rowconfigure(0, weight=1)
    frame.grid_columnconfigure(0, weight=1)
    xscroll = Scrollbar(frame, orient=HORIZONTAL)
    xscroll.grid(row=1, column=0, sticky=E+W)
    yscroll = Scrollbar(frame)
    yscroll.grid(row=0, column=1, sticky=N+S)
    canvas = Canvas(frame, bd=0, xscrollcommand=xscroll.set, yscrollcommand=yscroll.set)
    canvas.grid(row=0, column=0, sticky=N+S+E+W)
    xscroll.config(command=canvas.xview)
    yscroll.config(command=canvas.yview)
    frame.pack(fill=BOTH,expand=1)

    #adding the image
    File = askopenfilename(parent=root, initialdir="C:/",title='Choose an image.')
    img = ImageTk.PhotoImage(Image.open(File))
    canvas.create_image(0,0,image=img,anchor="nw")
    canvas.config(scrollregion=canvas.bbox(ALL))

    #function to be called when mouse is clicked
    def printcoords(event):
        #outputting x and y coords to console
        print (event.x,event.y)
    #mouseclick event
    canvas.bind("<Button 1>",printcoords)

    root.mainloop()

未经编辑,它将使用默认窗口坐标系统打印到控制台.画布小部件使左上角为0,0点,因此您可能不得不使用printcoords功能.要获得加载的图片尺寸,您将使用canvas.bbox(ALL),并且您可能希望切换到使用canvasx和canvasy coords而不是它的方式.如果你是tkinter的新手; 谷歌应该能够帮助你从这里完成它:).

Answer 2

这是我前一段时间使用wxPython和各种wxPython教程拼凑的版本.这会将鼠标单击坐标打印到单独的输出窗口.(使用Python 2.6.2,wxPython 2.8.10.1)

filepath在底部的变量中输入图像的路径.

import wx

class MyCanvas(wx.ScrolledWindow):
    def __init__(self, parent, id = -1, size = wx.DefaultSize, filepath = None):
        wx.ScrolledWindow.__init__(self, parent, id, (0, 0), size=size, style=wx.SUNKEN_BORDER)

        self.image = wx.Image(filepath)
        self.w = self.image.GetWidth()
        self.h = self.image.GetHeight()
        self.bmp = wx.BitmapFromImage(self.image)

        self.SetVirtualSize((self.w, self.h))
        self.SetScrollRate(20,20)
        self.SetBackgroundColour(wx.Colour(0,0,0))

        self.buffer = wx.EmptyBitmap(self.w, self.h)
        dc = wx.BufferedDC(None, self.buffer)
        dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
        dc.Clear()
        self.DoDrawing(dc)

        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_LEFT_UP, self.OnClick)

    def OnClick(self, event):
        pos = self.CalcUnscrolledPosition(event.GetPosition())
        print '%d, %d' %(pos.x, pos.y)

    def OnPaint(self, event):
        dc = wx.BufferedPaintDC(self, self.buffer, wx.BUFFER_VIRTUAL_AREA)

    def DoDrawing(self, dc):
        dc.DrawBitmap(self.bmp, 0, 0)

class MyFrame(wx.Frame): 
    def __init__(self, parent=None, id=-1, filepath = None): 
        wx.Frame.__init__(self, parent, id, title=filepath)
        self.canvas = MyCanvas(self, -1, filepath = filepath)

        self.canvas.SetMinSize((self.canvas.w, self.canvas.h))
        self.canvas.SetMaxSize((self.canvas.w, self.canvas.h))
        self.canvas.SetBackgroundColour(wx.Colour(0, 0, 0))
        vert = wx.BoxSizer(wx.VERTICAL)
        horz = wx.BoxSizer(wx.HORIZONTAL)
        vert.Add(horz,0, wx.EXPAND,0)
        vert.Add(self.canvas,1,wx.EXPAND,0)
        self.SetSizer(vert)
        vert.Fit(self)
        self.Layout()

if __name__ == '__main__':
    app = wx.App()
    app.SetOutputWindowAttributes(title='stdout')  
    wx.InitAllImageHandlers()

    filepath = 'ENTER FILEPATH HERE'
    if filepath:
        print filepath
        myframe = MyFrame(filepath=filepath)
        myframe.Center()
        myframe.Show()
        app.MainLoop()

Answer 3

这是 bigjim 答案的修订版。它适用于 python 3.4+（没有测试其他任何东西）。我没有打扰 PIL 部分，因为 tkinter 的 PhotoImage 可以处理 gif 和 pgm，这足以演示这个。

lambda 函数处理事件（窗口）坐标和图像坐标之间的转换。

我还添加了对新闻与发布的支持，因为我需要该特定功能。

from tkinter import *
from tkinter.filedialog import askopenfilename

event2canvas = lambda e, c: (c.canvasx(e.x), c.canvasy(e.y))

if __name__ == "__main__":
    root = Tk()

    #setting up a tkinter canvas with scrollbars
    frame = Frame(root, bd=2, relief=SUNKEN)
    frame.grid_rowconfigure(0, weight=1)
    frame.grid_columnconfigure(0, weight=1)
    xscroll = Scrollbar(frame, orient=HORIZONTAL)
    xscroll.grid(row=1, column=0, sticky=E+W)
    yscroll = Scrollbar(frame)
    yscroll.grid(row=0, column=1, sticky=N+S)
    canvas = Canvas(frame, bd=0, xscrollcommand=xscroll.set, yscrollcommand=yscroll.set)
    canvas.grid(row=0, column=0, sticky=N+S+E+W)
    xscroll.config(command=canvas.xview)
    yscroll.config(command=canvas.yview)
    frame.pack(fill=BOTH,expand=1)

    #adding the image
    File = askopenfilename(parent=root, initialdir="M:/",title='Choose an image.')
    print("opening %s" % File)
    img = PhotoImage(file=File)
    canvas.create_image(0,0,image=img,anchor="nw")
    canvas.config(scrollregion=canvas.bbox(ALL))

    #function to be called when mouse is clicked
    def printcoords(event):
        #outputting x and y coords to console
        cx, cy = event2canvas(event, canvas)
        print ("(%d, %d) / (%d, %d)" % (event.x,event.y,cx,cy))
    #mouseclick event
    canvas.bind("<ButtonPress-1>",printcoords)
    canvas.bind("<ButtonRelease-1>",printcoords)

    root.mainloop()