scaleShapeTransformation: Transforms shapefile using an affine transformation.

In madorning/energySim0.1.0: Spatial Energy Simulation: Linking Subsurface to Surface Resources

Description

Scales input shapefile to desired area. Units must be the same.

Usage

scaleShapeTransformation(inShape, newArea, percent = NULL,
  orientation = NULL, affine = NULL)

Arguments

inShape	A shapefile
newArea	A number for the desired area of the transformed shape
percent	The decimal percent ratio to transform the shapefile
orientation	The direction to transform the shapefile
affine	A 2D affine matrix to apply to shapefile

Details

Supply either the affine matrix or the percent and orientation that will be used to transform the shapefile. If orientation is one of the cardinal directions then percent is the decimal ratio for shapefile elongation in the specified direction relative to the perpendicular direction axis. If orientation is one of the ordinal directions, then percent is the decimal ratio for shear transformation of the shapefile in the specified direction relative to the perpendiuclar direction axis.

Value

A scaled shapefile with specified area and projection of inShape

Note

Edited by CDMartinez 14 June 16

Author(s)

Created by CDMartinez 11 May 16

Examples

library(sp)
points <- rbind(c(250,250),c(250,1750),c(1750,1750),c(1750,250),c(250,250))
shape <- SpatialPolygons(list(Polygons(list(Polygon(points)), 'auOutline')))
shape2 <- scaleShapeTransformation(inShape = shape,newArea = 1500000,
percent = .05, orientation='SW')
shape3 <- scaleShapeTransformation(inShape = shape,newArea = 1500000,
affine = rbind(c(.2,1),c(1,.2)))
plot(shape, axes = TRUE)
plot(shape2, add = TRUE, border = 'red')
plot(shape3, add = TRUE, border = 'blue')

madorning/energySim0.1.0 documentation built on May 22, 2019, 2:23 p.m.