PyCairo - 绘制不同类型的线连接
在本文中,我们将学习如何在Python中使用 PyCairo 使用不同的连接样式(如斜角、圆角和斜接)连接线。
Pycairo是一个Python模块,为 Cairo 图形库提供绑定。这个库用于在Python中创建 SVG 即矢量文件。打开 SVG 文件以查看它(只读)的最简单快捷的方法是使用现代网络浏览器,如 Chrome、Firefox、Edge 或 Internet Explorer——几乎所有这些都应该为 SVG 格式提供某种渲染支持.
要安装此模块,请在终端中运行此命令:
pip install pycairo
方法:
- 导入 Pycairo 模块。
- 创建一个 SVG 表面对象并向其添加上下文。
- 设置上下文的颜色和线宽
- 创建矩形
- 使用 set_line_join( ) 设置线连接样式
PyCairo 中的线连接样式有三种不同的方法。
方法#1:使用 set_line_join ( cairo.LINE_JOIN_MITER )。
Python3
# importing pycairo
import cairo
# creating a SVG surface
# here geek94 is file name
# & 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
# for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
#Setting line join style
context.set_line_join(cairo.LINE_JOIN_MITER)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
Python3
import cairo
# creating a SVG surface
# here geek94 is file name &
# 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
#for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
#Setting line join style
context.set_line_join(cairo.LINE_JOIN_BEVEL)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
Python3
# importing pycairo
import cairo
# creating a SVG surface
# here geek94 is file name &
# 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
# for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
#Setting line join style
context.set_line_join(cairo.LINE_JOIN_ROUND)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
Python3
# importing pycairo
import cairo
# creating a SVG surface
# here geek94 is file name &
# 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
# for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
# Setting line join style as Miter
context.set_line_join(cairo.LINE_JOIN_MITER)
# stroke out the color and width property
context.stroke()
context.rectangle(160, 30, 100, 100)
# Setting line join style as Bevel
context.set_line_join(cairo.LINE_JOIN_BEVEL)
# stroke out the color and width property
context.stroke()
context.rectangle(100, 160, 100, 100)
# Setting line join style as Round
context.set_line_join(cairo.LINE_JOIN_ROUND)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
输出:
方法#2:使用 set_line_join ( cairo.LINE_JOIN_BEVEL )。
例子
蟒蛇3
import cairo
# creating a SVG surface
# here geek94 is file name &
# 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
#for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
#Setting line join style
context.set_line_join(cairo.LINE_JOIN_BEVEL)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
输出 :
方法 #3:使用 set_line_join ( cairo.LINE_JOIN_ROUND )
例子 :
蟒蛇3
# importing pycairo
import cairo
# creating a SVG surface
# here geek94 is file name &
# 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
# for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
#Setting line join style
context.set_line_join(cairo.LINE_JOIN_ROUND)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
输出 :
所有三种类型的行连接都可以在下面的Python示例中看到,并且还可以比较每个行连接的输出
例子 :
蟒蛇3
# importing pycairo
import cairo
# creating a SVG surface
# here geek94 is file name &
# 700, 700 is dimension
with cairo.SVGSurface("geek94.svg", 700, 700) as surface:
# creating a cairo context object
# for SVG surface
#useing Context method
context = cairo.Context(surface)
context.set_source_rgba(0, 0, 0, 1)
context.set_line_width(14)
context.rectangle(30, 30, 100, 100)
# Setting line join style as Miter
context.set_line_join(cairo.LINE_JOIN_MITER)
# stroke out the color and width property
context.stroke()
context.rectangle(160, 30, 100, 100)
# Setting line join style as Bevel
context.set_line_join(cairo.LINE_JOIN_BEVEL)
# stroke out the color and width property
context.stroke()
context.rectangle(100, 160, 100, 100)
# Setting line join style as Round
context.set_line_join(cairo.LINE_JOIN_ROUND)
# stroke out the color and width property
context.stroke()
# printing message when file is saved
print("File Saved")
输出: