Function snapToGrid

snapToGrid(pos, grid, thresholdX?, thresholdY?): PointXY
Snap the given x,y to a point on the grid defined by gridX and gridY, using the given thresholds to calculate proximity to the grid.
Parameters
- pos: PointXY
  Position to transform
- grid: Grid
  Definition of the grid
- Optional thresholdX: number
  Defines how close to a grid line in the x axis a value must be in order to be snapped to it.
- Optional thresholdY: number
  Defines how close to a grid line in the y axis a value must be in order to be snapped to it.
Returns PointXY
The point to which the position was snapped, given the constraints of the grid.

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