Imports alicode.mukj.cn/yjkj.ink/work/geom alicode.mukj.cn/yjkj.ink/work/geom/encoding/geojson gonum.org/v1/plot/vg gonum.org/v1/plot/vg/draw gonum.org/v1/plot/vg/vgimg gonum.org/v1/plot/vg/vgpdf Standard library imports encoding/json fmt image image/color image/png io math reflect sort strings