Grid line tool?

Unity Engine
1

I’m creating a tile level editor, and I wan’t to add a line tool. Basically you click on one tile, then hold shift and click on another and it should create a line of tiles on the grid.

If it helps I’ve got a 2d array for the tiles.

Thanks in advance!

2

A simply pseudocode

if (shift pressed and clicked)
  Draw a line of tiles from (lastClickPos to newClickPos)
3

That’s pretty much what I have so far. The problem is figuring out where to actually add them.

4

I think you have your grind into a table variable.

//if you're adding horizontally
for(int i = 0; i < lengthOfLine; i++)
  addToGrid(lastClickedPos.x + i, lastClickedPos.y, tile[currectTile]);
5

I should probably implement horizontal and vertical lines first. Then I’ll worry about diagonal and every other case

6

You can find intersecting tiles either with math, for instance https://gist.github.com/ChickenProp/3194723
or using https://docs.unity3d.com/ScriptReference/Bounds.IntersectRay.html

7

I figured out a solution that involves interpolating between the two points in increments, and adding a tile at that position rounded to the nearest integer.