Question

我想只能在白色区域（重复区域）绘制，例如，如果您试图在按钮后面绘制或在它不会绘制的标签上绘制。可能吗？我需要它在学校的项目，我需要能够只在白色区域绘制，所以油漆不会覆盖标签，例如或不能在按钮下绘图

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.graphics import Color, Rectangle, Line
from kivy.uix.stencilview import StencilView
from kivy.core.window import Window
import socket
import sys
import os
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.label import Label
from functools import partial



class MyPaintWidget(Widget):
    lineSize = 5
    def on_touch_down(self, touch):
        with self.canvas:
            touch.ud['Line'] = Line(points=(touch.x, touch.y), width=self.lineSize)

    def on_touch_move(self, touch):
        touch.ud['Line'].points += [touch.x, touch.y]
class MyPaintApp(App):
    def build(self):
        self.parent = Widget()
        self.painter=MyPaintWidget(size=(695,510),pos=(100,50))
        with self.painter.canvas:
            Rectangle(pos=(100,50), size=(695,510))
        with open("Send_word.txt",'r') as fr:
            word_lable = Label(text = "Your word is " + fr.read(),font_size='30sp',pos = (400,530))
        self.parent.add_widget(word_lable)

        finishbtn = Button(text='finish',pos=(0, 0),size = (100,150))#finish button position and text
        finishbtn.bind(on_release=self.finish)#finish button onclick

        erasebtn = Button(text = "Erasor",pos=(0,150),size =(100,150))#erasor button position and text
        erasebtn.bind(on_release=self.black)

        redbtn = Button(text = "Red",background_color=(255,0,0,1.0),pos=(100, 0), size=(100,50))
        redbtn.bind(on_release=self.red)

        bluebtn = Button(text = "Blue",background_color=(0,0,255,1.0),pos=(200, 0), size=(100,50))
        bluebtn.bind(on_release=self.blue)

        greenbtn = Button(text = "Green",background_color=(0,255,0,1.0),pos=(300, 0), size=(100,50))
        greenbtn.bind(on_release=self.green)

        whitebtn = Button(text = "Black",pos=(400, 0), size=(100,50))
        whitebtn.bind(on_release=self.white)

        yellowbtn = Button(text = "Yellow",background_color=(255,255,0,1.0),pos=(500, 0), size=(100,50))
        yellowbtn.bind(on_release=self.yellow)

        lightbluebtn = Button(text = "L.Blue",background_color=(0,255,255,1.0),pos=(600, 0), size=(100,50))
        lightbluebtn.bind(on_release=self.lightblue)

        purplebtn = Button(text = "Purple", size=(100,50),background_color=(148,0,211,1.0),pos=(700,0))
        purplebtn.bind(on_release=self.purple)

        sizeupbtn = Button(text = "SizeUp",pos=(0, 300),size = (100,150))
        sizeupbtn.bind(on_release=self.SizeUp)


        sizedowmbtn = Button(text = "SizeDown",pos=(0, 450),size = (100,150))
        sizedowmbtn.bind(on_release=self.SizeDown)



        self.parent.add_widget(self.painter)
        #self.parent.add_widget(word_lable())
        self.parent.add_widget(finishbtn)
        self.parent.add_widget(redbtn)
        self.parent.add_widget(bluebtn)
        self.parent.add_widget(greenbtn)
        self.parent.add_widget(whitebtn)
        self.parent.add_widget(yellowbtn)
        self.parent.add_widget(erasebtn)
        self.parent.add_widget(lightbluebtn)
        self.parent.add_widget(purplebtn)
        self.parent.add_widget(sizeupbtn)
        self.parent.add_widget(sizedowmbtn)
        return self.parent
    def finish(self,obj):
        self.painter.export_to_png("screenshot.png")
        sexi = open("Send_word.txt",'r').read()
        print repr(sexi)
        send_file(sexi)

    def red(self,obj):
        with self.painter.canvas:
            Color(1,0,0)

    def blue(self,obj):
        with self.painter.canvas:
            Color(0,0,1)

    def green(self,obj):
        with self.painter.canvas:
            Color(0,1,0)

    def white(self,obj):
        with self.painter.canvas:
            Color(0,0,0)


    def yellow(self,obj):
        with self.painter.canvas:
            Color(1,1,0)

    def black(self,obj):
        with self.painter.canvas: 
            Color(1,1,1)

    def lightblue(self,obj):
        with self.painter.canvas:
            Color(0,1,1)

    def purple(self,obj):
        with self.painter.canvas:
            Color(1,0,1)

    def SizeUp(self,obj):
        if(self.painter.lineSize <100):
            self.painter.lineSize += 5

    def SizeDown(self,obj):
        if(self.painter.lineSize >1):
            self.painter.lineSize -= 5

if __name__ == '__main__':
    MyPaintApp().run()

Answer 1

你可以通过简单的方法和艰难的方式来做到这一点。简单的方法是使用this作为窗口小部件，其中包含StencilView。

更难的方法是直接使用nice demo并仅定位小部件画布的特定区域。

我可以在kivy中设置画布窗口，我只能在白色区域绘制而不能在其他地方绘制吗？

1 个答案: