# perspPoints

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##### Draw Points or Lines on a Surface Viewed in Perspective

After a surface has been plotted in a perspective view using persp.im, these functions can be used to draw points or lines on the surface.

Keywords
hplot, spatial
##### Usage
perspPoints(x, y=NULL, …, Z, M)perspLines(x, y = NULL, …, Z, M)perspSegments(x0, y0 = NULL, x1 = NULL, y1 = NULL, …, Z, M)perspContour(Z, M, …,
nlevels=10, levels=pretty(range(Z), nlevels))
##### Arguments
x,y

Spatial coordinates, acceptable to xy.coords, for the points or lines on the horizontal plane.

Z

Pixel image (object of class "im") specifying the surface heights.

M

Projection matrix returned from persp.im when Z was plotted.

Graphical arguments passed to points, lines or segments to control the drawing.

x0,y0,x1,y1

Spatial coordinates of the line segments, on the horizontal plane. Alternatively x0 can be a line segment pattern (object of class "psp") and y0,x1,y1 can be NULL.

nlevels

Number of contour levels

levels

Vector of heights of contours.

##### Details

After a surface has been plotted in a perspective view, these functions can be used to draw points or lines on the surface.

The user should already have called persp.im in the form M <- persp(Z, visible=TRUE, ...) to display the perspective view of the surface Z.

Only points and lines which are visible from the viewer's standpoint will be drawn.

##### Value

Same as the return value from points or segments.

persp.im

##### Aliases
• perspPoints
• perspSegments
• perspLines
• perspContour
##### Examples
# NOT RUN {
M <- persp(bei.extra$elev, colmap=terrain.colors(128), apron=TRUE, theta=-30, phi=20, zlab="Elevation", main="", expand=6, visible=TRUE, shade=0.3) perspContour(bei.extra$elev, M=M, col="pink", nlevels=12)
perspPoints(bei, Z=bei.extra\$elev, M=M, pch=16, cex=0.3, col="chartreuse")
# }

Documentation reproduced from package spatstat, version 1.64-1, License: GPL (>= 2)

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