选择区域未在Tkinter中显示 [英] Selection area is not showing up in Tkinter

问题描述

我正在开发一个应用程序，使用户可以根据自己的选择来缩放图形的一部分.我能够获得初始的x，y坐标(x0，y0)和最终的x，y坐标(x1，y1).但完全不知道为什么选择区域没有出现.

I am developing an application which lets user Zoom a part of the graph based on their selection. I am able to get the initial x, y coordinates(x0, y0) and also the final x, y coordinates(x1, y1). But completely clueless why the selection area is not showing up.

from Tkinter import *
matplotlib.use('TkAgg')
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

root = Tk()
graph = Figure(figsize=(5,4), dpi=100)
ax = graph.add_subplot(111)
plot = ax.plot([1,2,3,4],[5,6,2,8])
canvas = FigureCanvasTkAgg(graph, master=root)
canvas.show()
canvas.get_tk_widget().grid(column=2, row=1, rowspan=2, sticky=(N, S, E, W))

class Zoom(object):
    def __init__(self):
        self.graph = Figure(figsize=(5,4), dpi=100)
        self.ax = graph.add_subplot(111)
        self.rect = ax.patch
        self.rect.set_facecolor('green')
        self.ax.plot([1,2,3,4],[5,6,2,8])
        self.is_pressed = False
        self.x0 = None
        self.y0 = None
        self.x1 = None
        self.y1 = None
        self.aid = graph.canvas.mpl_connect('button_press_event', self.on_press)
        self.bid = graph.canvas.mpl_connect('button_release_event', self.on_release)
        self.cid = graph.canvas.mpl_connect('motion_notify_event', self.on_motion)

    def on_press(self, event):
        print 'press'
        self.is_pressed = True
        self.x0 = event.xdata
        self.y0 = event.ydata
        print(self.x1, self.x0)
        print(self.y1, self.y0)

    def on_motion(self, event):
        if self.is_pressed is True:
            print 'panning'
            self.x1 = event.xdata
            self.y1 = event.ydata
            print(self.x1, self.x0)
            print(self.y1, self.y0)
            self.rect.set_width(self.x1 - self.x0)
            self.rect.set_height(self.y1 - self.y0)
            self.rect.set_xy((self.x0, self.y0))
            self.rect.set_linestyle('dashed')
            self.ax.figure.canvas.draw()

    def on_release(self, event):
        print 'release'
        self.is_pressed = False
        self.x1 = event.xdata
        self.y1 = event.ydata
        print(self.x1, self.x0)
        print(self.y1, self.y0)
        self.rect.set_width(self.x1 - self.x0)
        self.rect.set_height(self.y1 - self.y0)
        self.rect.set_xy((self.x0, self.y0))
        self.rect.set_linestyle('solid')
        self.ax.figure.canvas.draw()

my_object = Zoom()
root.mainloop()

我从这个问题中得到了帮助Matplotlib:用鼠标绘制矩形形状的选择区域我得到的输出是

I have taken help from this question Matplotlib: draw a selection area in the shape of a rectangle with the mouse The output I am getting is

press
(0.0, 1.4007056451612905)
(0.0, 6.9296116504854366)

panning
(1.4007056451612905, 1.4007056451612905)
(6.8932038834951452, 6.9296116504854366)
panning
(None, 1.4007056451612905)
(None, 6.9296116504854366)
panning
(None, 1.4007056451612905)
(None, 6.9296116504854366)

release
(None, 1.4007056451612905)
(None, 6.9296116504854366)

推荐答案

它对我有用:

from Tkinter import *
from matplotlib.figure import *
import matplotlib

matplotlib.use('TkAgg')
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

root = Tk()
graph = Figure(figsize=(5,4), dpi=100)
ax = graph.add_subplot(111)
plot = ax.plot([1,2,3,4],[5,6,2,8])
canvas = FigureCanvasTkAgg(graph, master=root)
canvas.show()
canvas.get_tk_widget().grid(column=2, row=1, rowspan=2, sticky=(N, S, E, W))

class Zoom(object):
    def __init__(self):
        self.graph = Figure(figsize=(5,4), dpi=100)
        self.ax = graph.add_subplot(111)

        # should be Rectangle((0,0),0,0)
        self.rect = Rectangle((10,10),100,100)
        self.ax.add_patch(self.rect)

        self.ax.plot([1,2,3,4],[5,6,2,8])
        self.is_pressed = False
        self.x0 = 0.0
        self.y0 = 0.0
        self.x1 = 0.0
        self.y1 = 0.0
        self.aid = graph.canvas.mpl_connect('button_press_event', self.on_press)
        self.bid = graph.canvas.mpl_connect('button_release_event', self.on_release)
        self.cid = graph.canvas.mpl_connect('motion_notify_event', self.on_motion)

    def on_press(self, event):
        self.is_pressed = True
        if event.xdata is not None and event.ydata is not None:
            self.x0, self.y0 = event.xdata, event.ydata

            print 'press:', self.x0, self.y0

            # only remove old rectangle
            self.rect.set_width(0)
            self.rect.set_height(0)
            self.rect.set_xy((self.x0, self.y0))
            self.ax.figure.canvas.draw()

            # color and linestyle for future motion 
            self.rect.set_facecolor('red')
            self.rect.set_linestyle('dashed')

    def on_motion(self, event):
        if self.is_pressed:
            if event.xdata is not None and event.ydata is not None:
                self.x1, self.y1 = event.xdata, event.ydata
                self.rect.set_width(self.x1 - self.x0)
                self.rect.set_height(self.y1 - self.y0)
                self.rect.set_xy((self.x0, self.y0))
                self.ax.figure.canvas.draw()
                print 'rect:', self.x0, self.y0, self.x1, self.y1, (self.x1-self.x0), (self.y1-self.y0)

    def on_release(self, event):
        self.is_pressed = False
        print 'release:', event.xdata, event.ydata

        # change only color and linestyle

        #self.rect.set_width(self.x1 - self.x0)
        #self.rect.set_height(self.y1 - self.y0)
        #self.rect.set_xy((self.x0, self.y0))

        self.rect.set_facecolor('blue')
        self.rect.set_linestyle('solid')
        self.ax.figure.canvas.draw()

my_object = Zoom()
root.mainloop()

这篇关于选择区域未在Tkinter中显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！