About

Anchor is a table provided to a placer function. It has the following fields:

• x: the x coordinate of the anchor
• y: the y coordinate of the anchor

The coordinates are not in pixels; rather, they are in tile lengths. If we imagine an output image that can fit four tiles inside it, the anchors would look like this:

┌───────┬───────┐
│ (0,0) │ (1,0) │ (2,0)
├───────┼───────┤
│ (0,1) │ (1,1) │ (2,1)
└───────┴───────┘
  (0,2)   (1,2)   (2,2)

in (x, y) format.

Note that there will be an extra anchor both to the right and down for every image. This is to make up for shifting caused by the option output.offset. These are the anchors "outside" the box above (though they will likely still be visible, at least a bit!)