路径

https://www.w3school.com.cn/svg/svg_path.asp

https://www.iteye.com/blog/justcoding-2226354

SVG Path Builderhttps://codepen.io/anthonydugois/pen/mewdyZ

• M = moveto
• L = lineto
• H = horizontal lineto
• V = vertical lineto
• C = curveto
• S = smooth curveto
• Q = quadratic Belzier curve
• T = smooth quadratic Belzier curveto
• A = elliptical Arc
• Z = closepath

https://www.cnblogs.com/callmesummer/p/4569649.html