Changelog

Version: 0.3.4
Date: 2026-08-22
  Bugfixes:
    - The Plan selector was drawn twice. The block that used to choose what
      Apply commits was left behind when it was replaced, so the window showed
      two identical dropdowns.

Version: 0.3.3
Date: 2026-08-22
  Changes:
    - Where several materials would cover the same ground equally well, Apply
      now spends whichever one you are carrying most of, decided from your
      inventory at the moment you press it rather than fixed when the plan was
      made. Carrying none of them, it lays concrete.
    - Decided once per terrain type, so a patch comes out of one material
      rather than a chequerboard of whatever ran out first.
  Info:
    - Ice takes concrete, hazard concrete, refined concrete or refined hazard
      concrete. Not stone brick: its placement condition names the `meltable`
      layer, so the game will not let it be laid on ice. This falls out of the
      prototypes rather than being hardcoded, so a modded material is offered
      if it declares itself usable.

Version: 0.3.2
Date: 2026-08-22
  Changes:
    - The three-way selector now chooses what the planner works out positions
      for, not what Apply commits. "Heat pipes only" leaves the pipe network
      alone and solves the heat network over whatever is already standing, so
      laying pipes first and warming them afterwards is a real two-step job
      rather than half of one answer. Changing it re-runs the search.
    - It replaces the "Heat pipes" checkbox, which did the same thing for one of
      the three cases.
    - Nothing about heat pipes is shown at all on a planet where nothing
      freezes. The "Always plan heat pipes" mod setting brings the selector
      back for anyone who wants it elsewhere.
    - The cost model switch is hidden when no pipes are being planned, since it
      only decides how a pipe run is expressed.
    - Closing the window now clears the overlay with it. It was the only handle
      on the plan, so closing it used to strand the markers on screen.

Version: 0.3.1
Date: 2026-08-22
  Bugfixes:
    - Buildable ground now works on Aquilo. Ice carries the `meltable` collision
      layer, which pipes and heat pipes collide with, so bare ice takes neither -
      it needs concrete on top. The planner only understood covering items that
      name an explicit tile list, which missed concrete entirely, so almost
      nothing on Aquilo was routable.
    - Covering sequences of more than one tile are handled: the ammoniacal ocean
      needs an ice platform and then concrete. Apply lays the next missing layer
      and picks up the following one when re-run.
    - Space platform foundation is no longer offered as ground on a planet.
    - Because nothing was routable, the heat network had nowhere to go and came
      back empty, which also made "heat pipes only" apply nothing. Both work now.
    - A heating tower is a reactor, not a heat pipe. One clipping the edge of the
      planning area was reported as a few heat pipes "already built". It still
      counts as a heat source, but is no longer counted as built heat pipes.
    - Fixed a crash when a selection had no buildable tile at all.

Version: 0.3.0
Date: 2026-08-22
  Major Features:
    - Re-planning a partly built patch now solves only the missing part. Pipes that
      are already standing cost nothing to route through, so a fully connected
      selection comes back with nothing left to build.
    - Heat pipes that already exist are kept and extended rather than replaced, and
      pipework that was already there counts as needing heat. Planning heat, then
      pipes, then heat again converges instead of starting over each time.
  Changes:
    - Apply can commit pipes only, heat pipes only, or both.
    - Heat pipes are weighted against pipes when ranking layouts, so a route that
      is slightly longer but much easier to keep warm can win. A wider, deliberately
      varied pool of routes is costed for heat so there is something to trade.
    - The window offers ten layouts to cycle through rather than five.
    - The planner tool is put away after Apply.
    - A well is left in the rotation it already has when its current output tile is
      on the network anyway.
    - The window reports how much existing pipe and heat pipe is being reused.
  Bugfixes:
    - A heat network that cannot reach everything now covers what it can and says
      what it missed, instead of failing and being scored as though it needed no
      heat pipes at all - which made unheatable layouts win the ranking.
    - Fixed tree extraction stalling on ties. With free tiles in the graph the cost
      field is full of plateaus, and the old greedy walk could stop early, dropping
      wells from the plan.

Version: 0.2.0
Date: 2026-08-22
  Major Features:
    - Heat pipe planning for planets where entities freeze, such as Aquilo. Plans a
      connected heat network that touches every pipe and well, diagonals included.
    - Assumed buildable ground: route across terrain that could be covered, using
      whichever tile item covers it. Apply ghosts the ground too.
  Changes:
    - The planner window now stays where you drag it instead of re-centring on
      every button press.
    - Layouts of equal cost are ranked by how little ground they need laid.
  Bugfixes:
    - Tile ghosts are matched by entity type rather than ghost_name, so Apply no
      longer errors on ground tiles and no longer re-places existing ghosts.

Version: 0.1.0
Date: 2026-08-21
  Major Features:
    - Selection tool that plans a minimum-pipe network across the selected fluid wells.
    - Considers all four well rotations as part of the optimisation.
    - Exact (proven optimal) solver for small selections, strong heuristic for large ones.
    - Switchable cost model: fewest pipe tiles, or fewest entities using underground pipes.
    - Cycle through the top 5 distinct layouts.
    - Apply button rotates the wells and places pipe ghosts.