D3js - 2、html,css,svg
课程code：https://vizhub.com/curran/366c38ba5ebc4631b4bd936f3b709744
1、html,css
略，见w3school
2、svg
矢量图，放大不影响
<svg> </svg>
简单操作见⬇️
https://www.w3schools.com/graphics/svg_circle.asp
circle、rect
选颜色可以，google color picker
g
g tag 可以group对象, transform可以带着组内元素移动，fill可以覆盖原先的颜色, stroke: outline
<g transform="translate(0, 200)" fill="#adf6ff" stroke="black">
<circle cx="50" cy="50" r="40" stroke-width="5"></circle>
<rect x="150" y="25" width="50" height="50"></rect>
</g>
line(直线）, path(多段线)
x1, x2, y1, y2, stroke, stroke-width
<path fill="none" d="M300 280 L350 200 L400 250 L450 230"></path>
