get_transform: get_transform

In tcwilkinson/morphogram: Morphogram Tableaux to Compare Spatial Features Visually

get_transform

Description

An internal function which calculates a set of transformations needed for a set of features and returns these transformation instructions as a data.frame with columns xshift, yshift for affine transforms, rotate for rotation transformations as an angle, plus xcellwidth, ycellheight for grid based methods to help find the cell heights and widths per feature.

Usage

get_transform(x, method = "regulargrid", ...)

Arguments

x	An sf-compatible feature layer, often containing polygons whose size is to be visually compared; REQUIRED.
method	Method used to distribute features; default and only functioning method is "regulargrid". Other parameters used depend on the transformation method used.
direction	Direction of overall diagram, "row" fills each row first, "column" fills each column first; default "row".
cols	Number of columns of features to plot before moving onto next line if dir="v".
rows	Number of rows of features to plot before moving onto next line if dir="h".
margin	Scalar coefficient of spacing between features; default 1.1.
x.mar	Scalar coefficient of cell spacing on x axis, note that this is compounded on margin; default 1.
y.mar	Scalar coefficient of cell spacing on y axis, note that this is compounded on margin; default 1.
x.nudge	Additional spacing to add to x margins; default 0.
y.nudge	Additional spacing to add to y margins; default 0.

tcwilkinson/morphogram documentation built on Nov. 20, 2022, 3:45 a.m.