Python | kivy 中的线条(画布)
原文:https://www.geeksforgeeks.org/python-line-canvas-in-kivy/
Kivy 是 Python 中独立于平台的 GUI 工具。因为它可以在安卓、IOS、linux 和视窗等平台上运行。它基本上是用来开发安卓应用程序的，但并不意味着它不能在桌面应用程序上使用。
线条画布:
线条是顶点画布指令。它允许通过点画线。这段代码展示了如何使用/绘制扩展的线条画，如圆、椭圆、矩形和贝塞尔曲线等。
Basic Approach:
1) import kivy
2) import kivy App
3) import Gridlayout
4) import widget
5) set minimum version(optional)
6) Create as much as widget class as needed
7) create the App class
8) return the widget/layout etc class
9) Run an instance of the class
实施方式: #主. py
Python 3
# kivy Lines Demo
# import kivy module
import kivy
# base Class of your App inherits from the App class.
# app:always refers to the instance of your application
from kivy.app import App
# The GridLayout arranges children in a matrix.
# It takes the available space and
# divides it into columns and rows,
# then adds widgets to the resulting “cells”.
from kivy.uix.gridlayout import GridLayout
# Widgets are elements of
# a graphical user interface that
# form part of the User Experience.
from kivy.uix.widget import Widget
##############################################
# Classes form Different types of line as widgets
class LineEllipse1(Widget):
pass
class LineEllipse2(Widget):
pass
class LineEllipse3(Widget):
pass
class LineCircle1(Widget):
pass
class LineCircle2(Widget):
pass
class LineCircle3(Widget):
pass
class LineCircle4(Widget):
pass
class LineRectangle(Widget):
pass
class LineBezier(Widget):
pass
# Create the App class
class LineApp(App):
def build(self):
# Assign the number of column, spacing and padding
root = GridLayout(cols = 3, padding = 50, spacing = 100)
# Adding the widgets
root.add_widget(LineEllipse1())
root.add_widget(LineEllipse2())
root.add_widget(LineEllipse3())
root.add_widget(LineCircle1())
root.add_widget(LineCircle2())
root.add_widget(LineCircle3())
root.add_widget(LineCircle4())
root.add_widget(LineRectangle())
root.add_widget(LineBezier())
return root
# Run the App class
if __name__ == '__main__':
LineApp().run()
线千伏文件:
Python 3
# Line.kv file of the code
# Creating Different types of Lines(or shapes through line)
###########################################
# Row 1:
# Ellipse(1st row 1st element)
<LineEllipse1>:
# Creating Canvas
canvas:
Color:
rgba: 1, .1, .1, .9
# Ellipse Creation
Line:
width: 2.
ellipse: (self.x, self.y, self.width, self.height)
# Label the figure
Label:
center: root.center
text: 'Ellipse'
############################################
# Ellipse from 90 to 180((1st row 2nd element))
<LineEllipse2>:
canvas:
Color:
rgba: 1, .1, .1, .9
Line:
width: 2.
ellipse: (self.x, self.y, self.width, self.height, 90, 180)
Label:
center: root.center
text: 'Ellipse from 90 to 180'
############################################
# Ellipse from 90 to 720, 10 segments(1st row 3rd element)
<LineEllipse3>:
canvas:
Color:
rgba: 1, .1, .1, .9
Line:
width: 2.
ellipse: (self.x, self.y, self.width, self.height, 90, 720, 10)
Label:
center: root.center
text: 'Ellipse from 90 to 720, 10 segments'
halign: 'center'
############################################
# Circle(2nd row 1st element)
<LineCircle1>:
canvas:
Color:
rgba: .1, 1, .1, .9
Line:
width: 2.
circle:
(self.center_x, self.center_y, min(self.width, self.height)
/ 2)
Label:
center: root.center
text: 'Circle'
############################################
# Circle from 90 to 180(2nd row 2nd element)
<LineCircle2>:
canvas:
Color:
rgba: .1, 1, .1, .9
Line:
width: 2.
circle:
(self.center_x, self.center_y, min(self.width, self.height)
/ 2, 90, 180)
Label:
center: root.center
text: 'Circle from 90 to 180'
############################################
# Circle from 90 to 180, 10 segments(1st row 3rd element)
<LineCircle3>:
canvas:
Color:
rgba: .1, 1, .1, .9
Line:
width: 2.
circle:
(self.center_x, self.center_y, min(self.width, self.height)
/ 2, 90, 180, 10)
Label:
center: root.center
text: 'Circle from 90 to 180, 10 segments'
halign: 'center'
############################################
# Circle from 0 to 360 (3rd row 1st element)
<LineCircle4>:
canvas:
Color:
rgba: .1, 1, .1, .9
Line:
width: 2.
circle:
(self.center_x, self.center_y, min(self.width, self.height)
/ 2, 0, 360)
Label:
center: root.center
text: 'Circle from 0 to 360'
halign: 'center'
############################################
# Rectangle (3rd row 2nd element)
<LineRectangle>:
canvas:
Color:
rgba: .1, .1, 1, .9
Line:
width: 2.
rectangle: (self.x, self.y, self.width, self.height)
Label:
center: root.center
text: 'Rectangle'
############################################
# Bezier (3rd row 3rd element)
<LineBezier>:
canvas:
Color:
rgba: .1, .1, 1, .9
Line:
width: 2.
bezier:
(self.x, self.y, self.center_x - 40, self.y + 100,
self.center_x + 40, self.y - 100, self.right, self.y)
Label:
center: root.center
text: 'Bezier'
输出:
版权属于：月萌API www.moonapi.com，转载请注明出处
