【发布时间】：2015-12-05 11:16:54
【问题描述】：
main.py
from kivy.base import EventLoop
from kivy.config import Config
from kivy.graphics import Color, Line
from kivy.uix.behaviors import ToggleButtonBehavior
from kivy.uix.togglebutton import ToggleButton
from kivy.uix.widget import Widget
from kivy.utils import get_color_from_hex
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.popup import Popup
from kivy.clock import Clock
CURSOR = (
' @@@@ ',
' @--@ ',
' @--@ ',
' @--@ ',
' @--@ ',
' @@@@ ',
' ',
'@@@@@@ @@@@ @@@@@@ ',
'@----@ @--@ @----@ ',
'@----@ @--@ @----@ ',
'@@@@@@ @@@@ @@@@@@ ',
' ',
' @@@@ ',
' @--@ ',
' @--@ ',
' @--@ ',
' @--@ ',
' @@@@ ',
' ',
' ',
' ',
' ',
' ',
' ',
)
class Update_Location(Widget):
pass
class CanvasWidget(Widget):
line_width = 2
def on_touch_down(self, touch):
if Widget.on_touch_down(self, touch):
return
with self.canvas:
touch.ud['current_line'] = Line(
points=(touch.x, touch.y),
width=self.line_width)
def on_touch_move(self, touch):
if 'current_line' in touch.ud:
touch.ud['current_line'].points += (touch.x, touch.y)
def set_color(self, new_color):
self.last_color = new_color
self.canvas.add(Color(*new_color))
def set_line_width(self, line_width='Normal'):
self.line_width = {
'Thin': 1, 'Normal': 2, 'Thick': 4
}[line_width]
def clear_canvas(self):
saved = self.children[:]
self.clear_widgets()
self.canvas.clear()
for widget in saved:
self.add_widget(widget)
self.set_color(self.last_color)
def start_server(self):
host = '127.0.0.1'
port = 5000
notification_text="Server started on host: "+host+" and port: "+str(port)
server_start=Popup(title='Notification',content=Label(text=notification_text),size_hint=(.75,.75),auto_dismiss=True)
server_start.open()
Clock.schedule_interval(server_start.dismiss, 3)
class PaintApp(App):
def build(self):
EventLoop.ensure_window()
if EventLoop.window.__class__.__name__.endswith('Pygame'):
try:
from pygame import mouse
a, b = pygame_compile_cursor()
mouse.set_cursor((24, 24), (9, 9), a, b)
except:
pass
#boxlayout
self.layout = BoxLayout(orientation='vertical')
self.canvas_widget = CanvasWidget()
self.canvas_widget.set_color(
get_color_from_hex('#2980b9'))
self.layout.add_widget(self.canvas_widget)
#self.layout.add_widget(Label(text="Started Server : False , Connected to Server : False",color=(1,1,1),size_hint=(1, .1)))
return self.layout
#return self.canvas_widget
class RadioButton(ToggleButton):
def _do_press(self):
if self.state == 'normal':
ToggleButtonBehavior._do_press(self)
def pygame_compile_cursor(black='@', white='-'):
aa, bb = [], []
a = b = 0
i = 8
for s in CURSOR:
for c in s:
a <<= 1
b <<= 1
i -= 1
if c == black:
a |= 1
b |= 1
elif c == white:
b |= 1
if not i:
aa.append(a)
bb.append(b)
a = b = 0
i = 8
return tuple(aa), tuple(bb)
if __name__ == '__main__':
Config.set('graphics', 'width', '960')
Config.set('graphics', 'height', '540') # 16:9
# Config.set('graphics', 'resizable', '0')
# Config.set('input', 'mouse', 'mouse,disable_multitouch')
from kivy.core.window import Window
Window.clearcolor = get_color_from_hex('#ffffff')
PaintApp().run()
server.py
import socket
def start_server(host,port):
s = socket.socket()
s.bind((host,port))
s.listen(1)
c, addr = s.accept()
print "Connection from: " + str(addr)
while True:
data = c.recv(1024)
if not data:
break
print "from connected user: " + str(data)
data = str(data).upper()
print "sending: " + str(data)
c.send(data)
c.close()
if __name__ == '__main__':
start_server()
以上是我的简单绘画应用程序的代码（来自 kivy blue prints）。
我的目标是在本地主机上的一个应用程序上启动服务器，然后其他应用程序连接到它。那些可以连接到它的人应该从他们连接的服务器上更新他们的画布。如何发送数据和更新画布。我使用 python 的套接字库在上面的代码中创建了一个服务器。
我不想使用 http 请求/线程来建立与套接字的连接并使用 async.io。
【问题讨论】：
-
让服务器发出（可能是广播）JSON 化的画布命令对象。每个命令都可以是上下文命令的索引以及参数数组：
{i:0,p:[]}其中i是命令数组var cmds=['beginPath',...]的索引，p是任何命令参数的数组。然后就可以使用context.apply在客户端执行命令了。
标签： python sockets canvas kivy