PyCairo – 如何设置 SVG 单位?
在本文中,我们将看到如何使用Python在 pycairo 中设置 SVG 单元。 SVG unit用于描述SVG规范中坐标和长度有效的单位
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 文件进行查看(只读)的最简单快捷的方法是使用现代 Web 浏览器,如 Chrome、Firefox、Edge 或 Internet Explorer——几乎所有这些浏览器都应该为 SVG 格式提供某种渲染支持。
These are the following SVG units in Pycairo
- USER User unit, a value in the current coordinate system. If used in the root element for the initial coordinate systems it corresponds to pixels
- EM The size of the element’s font
- EX The x-height of the element’s font
- PX Pixels (1px = 1/96th of 1in)
- IN Inches (1in = 2.54cm = 96px)
- CM Centimeters (1cm = 96px/2.54)
- MM Millimeters (1mm = 1/10th of 1cm)
- PT Points (1pt = 1/72th of 1in)
- PC Picas (1pc = 1/6th of 1in)
- PERCENT Percent, a value that is some fraction of another reference value.
In order to use the we will use set_document_unit with SVG surface object
Syntax : set_document_unit()
Argument : It takes SVU unit i.e value associated with it.
Return : It returns non
Python3
# importing pycairo
import cairo
# creating a SVG surface
# here geek95 is file name & 700, 700 is dimension
with cairo.SVGSurface("geek95.svg", 700, 700) as surface:
# creating a cairo context object
context = cairo.Context(surface)
# creating a rectangle(square)
context.rectangle(10, 10, 100, 100)
# setting color of the context
context.set_source_rgba(0.4, 1, 0.4, 1)
# stroke out the color and width property
context.fill()
# Setting SVG unit
surface.set_document_unit(7)
# printing
print("SVG unit Changed")
输出:
SVG unit Changed