vg: harmonise UseDPI input parameter type
Created by: kortschak
See https://github.com/gonum/plot/pull/492#discussion_r246617896.
We should choose a type, int
or float64
for all the vg types' UseDPI
calls.
Created by: kortschak
See https://github.com/gonum/plot/pull/492#discussion_r246617896.
We should choose a type, int
or float64
for all the vg types' UseDPI
calls.