1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
## 11/21/07 dhm
## version where shift works for lines and polygons
## adding option to rotate
if (!isGeneric("elide")) {
setGeneric("elide", function(obj, ...) {
standardGeneric("elide")
})
}
elide.points <- function(obj, bb=NULL, shift=c(0, 0), reflect=c(FALSE, FALSE),
scale=NULL, flip=FALSE, rotate=0, center=NULL, unitsq=FALSE) {
if (length(shift) != 2)
stop("Two coordinate shift in input units required")
if (!is.numeric(shift)) stop("shift not numeric")
if (!is.logical(reflect)) stop("reflect must be logical")
if (length(reflect) != 2) stop("Two coordinate reflect required")
if (!is.logical(flip)) stop("flip must be logical")
if (!is.numeric(rotate)) stop("rotate not numeric")
if (!is.null(center) && length(center) != 2)
stop("center must be numeric of length two")
if (!is.logical(unitsq)) stop("unitsq must be logical")
crds <- coordinates(obj)
if (is.null(bb)) bb <- bbox(obj)
if (rotate != 0 && is.null(center)) center <- bb[,1]
if (rotate != 0) crds <- rotateCoords(crds, rotate, center)
if (flip) {
y <- crds[,1] + shift[1]
x <- crds[,2] + shift[2]
yr <- bb[1,] + shift[1]
xr <- bb[2,] + shift[2]
} else {
x <- crds[,1] + shift[1]
y <- crds[,2] + shift[2]
xr <- bb[1,] + shift[1]
yr <- bb[2,] + shift[2]
}
bb <- NULL
if (!is.null(scale) && is.logical(scale) && scale && unitsq) {
bb <- rbind(c(0,1), c(0,1))
colnames(bb) <- c("min", "max")
}
scale <- scaleCoords(scale=scale, xr=xr, yr=yr)
crds <- elideCoords(x=x, y=y, xr=xr, yr=yr, reflect=reflect, scale=scale)
res <- SpatialPoints(crds, bbox=bb)
res
}
elide.pointsdf <- function(obj, bb=NULL, shift=c(0, 0),
reflect=c(FALSE, FALSE), scale=NULL, flip=FALSE, rotate=0, center=NULL) {
res <- elide(as(obj, "SpatialPoints"), bb=bb, shift=shift,
reflect=reflect, scale=scale, flip=flip, rotate=rotate, center=center)
# df <- as(obj, "data.frame")[,-c(1,2)]
# df <- as(obj, "data.frame")
df <- slot(obj, "data")
res <- SpatialPointsDataFrame(res, data=df)
res
}
setMethod("elide", signature(obj="SpatialPoints"), elide.points)
setMethod("elide", signature(obj="SpatialPointsDataFrame"), elide.pointsdf)
## rotate angle degrees clockwise around center
rotateCoords <- function(crds, angle=0, center= c(min(crds[,1]),min(crds[,2]))) {
co <- cos(-angle*pi/180)
si <- sin(-angle*pi/180)
adj <- matrix(rep(center,nrow(crds)),ncol=2,byrow=TRUE)
crds <- crds-adj
cbind(co * crds[,1] - si * crds[,2],
si * crds[,1] + co * crds[,2]) + adj
}
scaleCoords <- function(scale, xr, yr) {
if (!is.null(scale)) {
if (is.logical(scale) && scale) scale <- 1
else if (!is.numeric(scale)) stop("scale neither TRUE nor numeric")
dx <- abs(diff(xr))
dy <- abs(diff(yr))
md <- max(dx, dy)
scale <- scale * (1/md)
} else scale <- 1
scale
}
elideCoords <- function(x, y, xr, yr, reflect, scale, rotate, center) {
if (reflect[1]) {
x <- xr[2] - x + xr[1]
}
if (reflect[2]) {
y <- yr[2] - y + yr[1]
}
if (!isTRUE(all.equal(scale, 1))) {
x <- (x - xr[1]) * scale
y <- (y - yr[1]) * scale
}
crds <- cbind(x, y)
crds
}
elide.lines <- function(obj, bb=NULL, shift=c(0, 0), reflect=c(FALSE, FALSE),
scale=NULL, inverse=FALSE, flip=FALSE, rotate=0, center=NULL) {
if (length(shift) != 2)
stop("Two coordinate shift in input units required")
if (!is.numeric(shift)) stop("shift not numeric")
if (!is.logical(reflect)) stop("reflect must be logical")
if (length(reflect) != 2) stop("Two coordinate reflect required")
if (!is.logical(flip)) stop("flip must be logical")
if (!is.numeric(rotate)) stop("rotate not numeric")
if (!is.null(center) && length(center) != 2)
stop("center must be numeric of length two")
if (is.null(bb)) bb <- bbox(obj)
if (rotate != 0 && is.null(center)) center <- bb[,1]
if (flip) {
yr <- bb[1,] + shift[1]
xr <- bb[2,] + shift[2]
} else {
xr <- bb[1,] + shift[1]
yr <- bb[2,] + shift[2]
}
scale <- scaleCoords(scale=scale, xr=xr, yr=yr)
lns <- slot(obj, "lines")
new_lns <- lapply(lns, function(x) {
Lns <- slot(x, "Lines")
new_Lns <- lapply(Lns, function(y) {
crds <- slot(y, "coords")
## rotate first, then elide (shift) [side effects if bb, scale or others supplied]
if (rotate != 0) crds <- rotateCoords(crds, rotate, center)
if (flip) {
yc <- crds[,1] + shift[1]
xc <- crds[,2] + shift[2]
} else {
xc <- crds[,1] + shift[1]
yc <- crds[,2] + shift[2]
}
new_crds <- elideCoords(x=xc, y=yc, xr=xr, yr=yr,
reflect=reflect, scale=scale)
## if want to elide first, then rotate:
## new_crds <- rotcrds(new_crds,rotate,center)
Line(new_crds)})
Lines(new_Lns, ID=slot(x, "ID"))})
res <- SpatialLines(new_lns)
res
}
elide.linesdf <- function(obj, bb=NULL, shift=c(0, 0), reflect=c(FALSE, FALSE),
scale=NULL, inverse=FALSE, flip=FALSE, rotate=0, center=NULL) {
res <- elide(as(obj, "SpatialLines"), bb=bb, shift=shift,
reflect=reflect, scale=scale, flip=flip, rotate=rotate, center=center)
df <- as(obj, "data.frame")
res <- SpatialLinesDataFrame(res, data=df)
res
}
setMethod("elide", signature(obj="SpatialLines"), elide.lines)
setMethod("elide", signature(obj="SpatialLinesDataFrame"), elide.linesdf)
elide.polygons <- function(obj, bb=NULL, shift=c(0, 0), reflect=c(FALSE, FALSE),
scale=NULL, inverse=FALSE, flip=FALSE, rotate=0, center=NULL) {
if (length(shift) != 2)
stop("Two coordinate shift in input units required")
if (!is.numeric(shift)) stop("shift not numeric")
if (!is.logical(reflect)) stop("reflect must be logical")
if (length(reflect) != 2) stop("Two coordinate reflect required")
if (!is.logical(flip)) stop("flip must be logical")
if (!is.numeric(rotate)) stop("rotate not numeric")
if (!is.null(center) && length(center) != 2)
stop("center must be numeric of length two")
if (is.null(bb)) bb <- bbox(obj)
if (rotate != 0 && is.null(center)) center <- bb[,1]
if (flip) {
yr <- bb[1,] + shift[1]
xr <- bb[2,] + shift[2]
} else {
xr <- bb[1,] + shift[1]
yr <- bb[2,] + shift[2]
}
scale <- scaleCoords(scale=scale, xr=xr, yr=yr)
pls <- slot(obj, "polygons")
new_pls <- lapply(pls, function(x) {
Pls <- slot(x, "Polygons")
new_Pls <- lapply(Pls, function(y) {
crds <- slot(y, "coords")
if (rotate != 0) crds <- rotateCoords(crds,rotate,center)
if (flip) {
yc <- crds[,1] + shift[1]
xc <- crds[,2] + shift[2]
} else {
xc <- crds[,1] + shift[1]
yc <- crds[,2] + shift[2]
}
new_crds <- elideCoords(x=xc, y=yc, xr=xr, yr=yr,
reflect=reflect, scale=scale)
Polygon(new_crds)})
Polygons(new_Pls, ID=slot(x, "ID"))})
res <- SpatialPolygons(new_pls)
res
}
elide.polygonsdf <- function(obj, bb=NULL, shift=c(0, 0),
reflect=c(FALSE, FALSE), scale=NULL, inverse=FALSE, flip=FALSE,
rotate=0, center=NULL) {
res <- elide(as(obj, "SpatialPolygons"), bb=bb, shift=shift,
reflect=reflect, scale=scale, flip=flip, rotate=rotate, center=center)
df <- as(obj, "data.frame")
res <- SpatialPolygonsDataFrame(res, data=df)
res
}
setMethod("elide", signature(obj="SpatialPolygons"), elide.polygons)
setMethod("elide", signature(obj="SpatialPolygonsDataFrame"), elide.polygonsdf)
|
