Suggestion (Measure Plugins)

Could some1 make a measure plugin, with selecting position 1 and 2 with some command like checkpoints, I mean u stand at the edge of the block, select your position and then u go/climb to the other position and select it as 2nd (cuz I can't mark invisible blocks)

or.. my 2nd idea was making some "jump path" something like moving with noclip (where u can't go through walls) from 1st to 2nd possition, so ppl can measure jump lenght of 90 degree jumps, dunno can't explain it very well :)