geom_gene_label () uses the 'ggfittext' package to fit text to genes. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. geom_curve allows users to draw a curved line such as the one seen in the example imate to the left. legend = NA, inherit. In this example, we’ll do both (Figure 7. Geometry Dash. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate geostrophic windsThe function ReadNetCDF () relies on the ncdf4 package to read NetCDF files with ease. 14. Again, the 'canonical' way of plotting vectors is to use geom_segment() and specify x , y , xend and yend aesthetics which can be a lot of typing when one has the data on location and displacement (or velocity). The value of the maximum vector magnitude in scale_mag() is now chosen to be a “pretty” number close to the maximum. geom_segment. geom: a character specifying the geometry to be used for the graph Allowed values are "point" or "arrow" or "text" color: the color to be used. This tutorial describes how to add one or more straight lines to a graph generated using R software and ggplot2 package. All text drawing options available in ggfittext::geom_fit_text() (growing, reflowing, etc. fill = NULL, lineend = "butt", linejoin = "round", na. R geom_segment-method. Text geoms are useful for labeling plots. Using ggplot2, 2 main functions are available for that kind of annotation: . geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. Arrow on ggplot2 mid way through path. . edu)ggsn. This will. geom_arrow () is the same as geom_vector () but defaults to preserving the direction under coordinate transformation and different plot ratios. geom_gene_arrow () is a ‘ggplot2’ geom that represents genes with arrows. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. Otherwise when dealing with functions, $longleftrightarrow$ might also be used to denote a bijective function. 5, -. One way would be to sort the data by year and use geom_path rather than geom_line, which plots in data order rather than in order of the x variable. aes = TRUE, arrowhead_width = grid::unit(4, "mm"), Description. Text is the most common kind of annotation. 1. The bottom layer draws the line. All arguments to this geom are identical to those of geom_segment, including arrow, which is useful to plot directed networks in conjunction with the arrow. geom_arrow() now is geom_vector() with better documentation and more parameters and geom_arrow() is a new geom for arrows that preserve direction. R","path. Orientation. R stat_coverage-method. Create line plots and change line types. You can now use your ornament as the arrow_head , arrow_fins and arrow_mid arguments. In this guide we are going to use the following example plot. Before ggplot2 introduced geom_contour_filled(), the ‘canonical’ way to get filled contours was by using stat_contour() with a polygon geom and mapping fill to level (see this issue). Remember what I just wrote: the type of geom you select dictates the type of chart make. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. Scale bar and North arrow (package ggspatial) Several packages are available to create a scale bar on a map (e. My issue is that I want to connect the line to the "edge" of the point, not the center, so that the arrow is visible regardless of the size of the point. See the underlying drawing function grid::curveGrob () for the parameters that control the curve. Details. Example 1: Add Single Line Segment to ggplot2 Plot. It can also return an array with named dimensions or a vector, for the case of adding new columns to an existing. 为了显示上面的图形，我们使用了geom_edge_link()和geom_node_point()函数，它们的作用是：将节点绘制为点，将边绘制为直线。. The basic geom_arrowsegment() is equivalent to geom_segment(arrow = arrow()). rm geom_gene_arrow 7 geom_gene_arrow A ’ggplot2’ geom to draw genes as arrows Description geom_gene_arrow() draws genes as arrows, allowing gene maps to be drawn. まずは公式のmujoco-pyで markers_demo. rm Description. However, arrow does not recognize variables directly from the data argument in ggplot and one must specify data. Aids the eye in seeing patterns in the presence of overplotting. Search for a graph. I illustrate my Problems: Create some sample data and a plot: geom_segment (mapping = NULL, data = NULL, stat = "identity", position = "identity",. Hi @mchiapello, sorry it took me a while to get to this issue. In the example below, there is a third size in the call to geom_text_repel () to specify the font size for the text labels. docx. I have added the text using text geom in annotate. R layout_linear-method. , arrow = NULL, arrow. Various ways of representing a vertical interval defined by x , ymin and ymax. レポジトリの basic. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. I would like to extend to geom_curve() but the intricacies of grid::curveGrob() make that much more complicated. Add title, subtitle, caption and change axis labels. Before you think ggplot2::geom_segment () and ggplot2::geom_path (), these functions have some additional tricks up their sleeves. na. geom_spatial_segment. g. position_nudge () is generally useful for adjusting the position of items on discrete scales by a small amount. This was ugly and bad and didn’t work in most cases, so I threw together some hacks to make it work,. This will. R geom_arch-method. R stat_identity-method. downwards arrow in R-plot axis label. Each case draws a single graphical object. ggplot2 - annotate outside of plot. gitignore","path":"R/. Added total amount of explained variance as a caption in the plot. Adding a line like geom_line(aes(x=1), arrow=arrow(length=unit(0. Using ggplot, I would like to draw a segment, curve or path from one point to another, including an arrow. The upper geom_point layer draws points at the starting points of the line segments (filled in white, with a black outline). I adapted this answer for every nth label to put an observation point every nth data point, but if I try to use this with path I get straight lines between these points. names (. The tikzdevice package is great if you are generating a . R layout_circle-method. These start and end locations are used to determine the directions in which the arrows point. network. gitignore","contentType":"file"},{"name":"ConvertLongitude. geom_contour_fill() This geom has a bit of a long story. To draw arrows in ggplot, I use geom_segment and arrow=arrow(). Rotate axis text labels. ggplot2::ggplot (example_genes, ggplot2::aes (xmin = start, xmax = end, y = molecule, fill = gene)) + geom_gene_arrow () + ggplot2::facet_wrap (~ molecule, scales. In this example, I added geom_point(). mag = 0, skip = 0,. See the underlying drawing function grid::curveGrob () for the parameters that control the curve. frame containing the variable using the $ operator. A ggplot is built up from a few basic elements: Data: The raw data that you want to plot. geom_chevron-method. Run this code. Also the fact that the specified arrow position corresponds to the arrowhead tip can make lines look a little lopsided; it would be much. I can use geom_text to position the numbers near the points, but this is messy. geom_curve () draws a curved line. font, awt. angle = 15, arrow. It is also possible to pass only values of x, in which case, regular linear interpolation is performed and y. (It is assumed that the user wants some kind of arrow. 1. Description. The syntax of geom_line. #' @param font. 0 New Features. Look of arrows in ggplot2 geom_segment() 3. R","path":"R/AllClasses. The error comes from the xned argument. table with optional keyed columns for faster processing afterwards. It adds arrows in. rmMissing value handling. s + geom_bar(position = "dodge") Arrange elements side by side s + geom_bar(position = "fill") Stack elements on top of one another, normalize height e + geom_point(position = "jitter") Add random noise to X and Y position of each element to avoid overplotting e + geom_label(position = "nudge")A Nudge labels away from pointsgeom_contour_fill() This geom has a bit of a long story. Updated documentationThe existing text-based geom layers in ggplot2 ( geom_text and geom_label) are ideal for the majority of plots, since typically textual annotations are short, straight and in line with the axes. arrow - (default: NULL) the arrow to draw at the end point of the line segment (use the arrow() function in R's grid package to create arrows) Example This plot contains two layers. Home ;. gap argument of fortify. rm is TRUE or FALSE. The ggbio package extends and specializes the grammar of graphics for biological data. geom: a text specifying the geometry to be used for the graph. . How can I add two-headed arrows (or brackets) in year 2030 on the plot to show the differences between emissions at year 2030 with emission levels of year 2005 (the black horizontal line). 2 环型网络图. network. New geometries support insets in plots, data labels, marginal marks and the use of native plot coordinates (npc). library (dplyr) # get %>% and mutate p <- p+geom_segment (data=df_arrows, aes (x = 0, y = 0, xend = x, yend = y), arrow = arrow (length = unit (0. You select the clades using the internal node number for the node that connects all the taxa in that clade. mapping: Set of aesthetic mappings created by aes or aes_. You provide the data, tell ggplot2 how to map variables to aesthetics, what graphical primitives to use, and it takes care of the details. This was ugly and bad and didn’t work in most cases, so I threw together some hacks to make it work,. We’ll make our own geom_arrow function! In this episode of Code Club, Pat continues to morph. The density ridgeline plot [ggridges package] is an alternative to the standard geom_density() [ggplot2 R package] function that can be useful for visualizing changes in distributions, of a continuous variable, over time or space. ~ head (. However, I want to have some "beautiful" thick arrows. Author(s) Tengfei Yin. linewidth_head. By not declaring x = x for example, the first variable x is matched to the x parameter through the position in the function call. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. They may also be parameters to the paired geom/stat. Details. aes = TRUE, arrowhead_width =. legend = NA, inherit. A bubblechart is a scatterplot with a third variable. North arrow styles. I think you may want to look at the gggenes package - may help you not only for the arrows :) From the example in the vignette, I used the settings to get the head to the same width as the segment. geom_feature_label: A 'ggplot2' geom to add text labels to point genetic features; geom_gene_arrow: A 'ggplot2' geom to draw genes as arrows; geom_gene_label: A 'ggplot2' geom to add text labels to gene arrows; geom_subgene_arrow: A 'ggplot2' geom to draw subgene segments of gene arrows; geom_subgene_label: A 'ggplot2' geom to add text labels. Legend keys will be drawn with the same aesthetics as the geom they relate to, which in this case is geom_arrow(). <p>Text geoms are useful for labeling plots. However, arrow does not recognize variables directly. ggplot add annotation box, arrow with dynamic value in it. Here I provide a geom_curve2() that allows you to do that. Edge variants. Another advantage of using this geom, you can use alpha. Example 2: Draw ggplot2 Plot with Arrow Using geom_segment () Function. All objects will be fortified to produce a data frame. Arrows Description. Unlike geom_ or stat_ functions, layer_spatial. Change a ggplot theme and modify the background color. R layout_circle-method. geom_curve allows users to draw a curved line such as the one seen in the example imate to the left. geom_path() is a useful way to represent a time series with two response variables. R geom_segment-method. The function below illustrates the different point shape values. Before ggplot2 introduced geom_contour_filled(), the ‘canonical’ way to get filled contours was by using stat_contour() with a polygon geom and mapping fill to level (see this issue). 0. obj. The data to be displayed in this layer. Before we dig into creating line graphs with the ggplot geom_line function, I want to briefly touch on ggplot and why I think it’s the best choice for plotting graphs in R. geom_sf() is an unusual geom because it will draw different geometric objects depending on what simple features are present in the data: you can get points, lines, or polygons. ) are also available here. The start and end locations of the gene are expressed with the xmin and xmax aesthetics, while the molecule can be specified with the y aesthetic. install_github ('fawda123/ggord') library (ggord) ggord (fit)+theme_grey () devtools::install_github ("sinhrks/ggfortify") library (ggfortify) ggplot2::autoplot (fit, label = TRUE, loadings. 7 Further tweaking of the scale bars and north arrow. 11 ): The default angle is 30, and the default length of the arrowhead lines is 0. ) The extended functionality is to allow free placement of the arrowhead anywhere along the segment, and also multiple arrowheads, and to allow a fill aesthetic. r, R/geom-errorbar. 示例 1. Limitations. Each point along the line has a numeric value associated with it giving the position along the path, and it is therefore possible to show. g. 1. lineend. specification for arrow heads, as created by arrow. They may also be parameters to the paired geom/stat. to control graphics. Add arrow below x axis. These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. pdf. 2 inches. 7. Details. py で紹介されているものをほぼそのままやります。. arrow_head. linejoin: Line join style (round, mitre, bevel). The arrowheadr functions do not depend on ggarrow, but were designed to be used with ggarrow. 7. If you use arguments, e. Source: R/geom-crossbar. Tot col. 5) The stat_summary function is very powerful for adding specific summary statistics to the plot. angle, grid:: unit (arrow. linemitre: Line mitre limit (number greater than 1). R geom_rect-method. So does this mean that a contact, e. . This course is an introduction to database systems used in the Geomatics Industry. contact [2]. {{ message }} Instantly share code, notes, and snippets. trying to draw an arrow with geom_segment. I want to keep the plot in ggplot as I am just adding one extra layer to existing maps which are set up in ggplot (the actual maps will have several other sf layers with polygons, points and lines). They may also be parameters to the paired geom/stat. geom. 1. The bottom layer draws the line segments, with solid blue lines of width 2 ending in an arrow. But, with geom_mark it is a simple as setting the label argument. The above answer is correct but it annoyed me that the labels and the lines overlap. It has to be a data frame. fviz_pca () provides ggplot2-based elegant visualization of PCA outputs from: i) prcomp and princomp [in built-in R stats], ii) PCA [in FactoMineR], iii) dudi. The start and end locations of the gene are expressed with the xmin and xmax aesthetics, while the molecule can be specified with the y aesthetic. In python flile, set type option of add_maker to "GEOM_MESH". This was ugly and bad and didn’t work in most cases, so I threw together some hacks to make it work,. The basic geom_arrowsegment() is equivalent to geom_segment(arrow = arrow()). Learn more about the basics and the interpretation of principal component. call(rbind, by(movies, round (movies$rating), function (df. Details. geom_arrow () is the same as geom_vector () but defaults to preserving the direction under coordinate transformation and different plot ratios. Defaults to 3 mm, which is the default height of gene arrows drawn with geom_gene_arrow(). I make a boxplot like this, where I annotate the hline with "test". Plotting arrows can be a pain. The geom_bar and geom_col layers are used to create bar charts. geom_label () draws a rectangle behind the text, making it easier to read. arrow: specification for arrow heads, as created by grid::arrow(). The horizontal red arrow in the first plot. First, we have to install and load the ggplot2 package: install. Add supplementary data to a plotCreate a karyogram layout. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. We can use geom_cladelabel() to add another geom layer to annotate a selected clade with a bar indicating the clade with a corresponding label. Again, the ‘canonical’ way of plotting vectors is to use geom_segment() and specify x, y, xend and yend aesthetics which can be a lot of typing when one has the data on location and displacement (or velocity). geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. ggplot2 is a powerful and a flexible R package, implemented by Hadley Wickham, for producing elegant graphics. A geom that draws line ranges, defined by an upper and lower value. Details. . This is useful e. Detailed answer (and collect color legend) Moreover, to collect the color, setting the range the same allows to have only one legend for degree_sum. I would like to make the arrow halfway through the lines. geom_relief() and geom_shadow() now don’t have a size aesthetic, since they shouldn’t have had it anyway. The first post introduced the concept of layouts, which is simply a specification on how nodes should be placed on a plane. Parametrization of ggplot2::geom_segment either by location and displacement or by magnitude and angle with default arrows. There are three common ways to invoke ggplot : ggplot (df, aes (x, y, <other aesthetics>)) ggplot (df) ggplot () The first method is recommended if all layers use the same data and the same set of aesthetics, although this method can also be used to add a layer using data from another data frame. linemitre: Line mitre limit (number greater than 1). Let’s annotate the clade with the most recent. You can use the following basic syntax to draw an arrow in a plot in ggplot2: library(ggplot2) ggplot (df, aes (x=x, y=y)) + geom_point () + geom_segment (aes (x=5, y=6, xend=8, yend=9), arrow = arrow. rm = FALSE, show. The curvature, angle and ncp arguments of geom_curve are also available: if curvature is set to any value above 0 (the default), the edges. It would be much cleaner to line them up along the outside edge of the plot. data. Before ggplot2 introduced geom_contour_filled(), the ‘canonical’ way to get filled contours was by using stat_contour() with a polygon geom and mapping fill to level (see this issue). Source: R/annotation. We saw above that geom_raster() requires converting a stars object to a data. I would like to associate sample size values with points on a plot. Current these replace only geom_segment() and work only for linear coordinate systems. 2, "cm"))) p + geom_text (data = df_arrows %>% mutate (labs = row. 0). Principal component analysis (PCA) reduces the dimensionality of multivariate data, to two or three that can be visualized graphically with minimal loss of information. Details. frame first before creating a map. geom_arrow() is the same as geom_vector() but defaults to preserving the direction under coordinate transformation and different plot ratios. geom_text_repel() geom_label_repel() Text labels repel away from each other, away from data points, and away from edges of the plotting area. ). Database. # ' @param. Next, we can draw a ggplot2 scatterplot. the same binwidth, breaks, or bins). R geom_arrowrect-method. Adding Arrows into ggplot. 0 : GEOM 3020: Surveying Computations 3. # ' @param arrow Arrow specification to show the direction in the lag path. Solutions Available. This geom draws genes as arrows along a horizontal line representing the molecule. rm. Note that while geom_text_contour() can angle itself to follow the contour, this is not the case with geom_label_contour(). I also created a scale_mag() to manipulate the length of the arrows with the prospect of creating also a new guide. They may also be parameters to the paired geom/stat. geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. g. geom_segment () draws a straight line between points (x, y) and (xend, yend). gitignore","path":"R/. For full details on how these options work, see the documentation for ggfittext::geom_fit_text (). Learn more about setting these aesthetics in vignette ("ggplot2-specs"). type = "closed", arrow = grid:: arrow (arrow. In the pop-up window, change the last chunk of code from this: They may also be parameters to the paired geom/stat. R stat_aggregate-method. geom_boxplot: Regular boxplot: stat_summary(fun. aes = TRUE (the default), is combined with the default mapping at the top level of the plot. 27. size, which tells ggrepel the point size, so it can position the text labels away from them. 以下がコードの主な部分で、viewerの add_marker でマーカーを追加すること. All core Bioconductor data structures are supported, where appropriate. Default statistic: stat_identity. R CHARTS. However, there are some occasions when it is useful to have text follow a curved path. This set of geom, stat, and coord are used to visualise simple feature (sf) objects. This geom treats each axis differently and, thus, can thus have two orientations. R defines the following functions: geom_arrow_pca geom_label_pca pca_scatter_plot pca_biplot pca_load_plot pca_scree_plot prep_pca Lightbridge-KS/lbmod source: R/pca. geom_path() connects the observations in the order in which they appear in the data. x and y define the locations of points or of positions along a line or path. Parallax Problem 1. Does. Segments with geom_segment. , xlab, ylab, main, angle. With ggplot2, shapes and line types can be assigned overall (e. Using the waffle package, we will create waffle charts of Iron (Fe) groundwater contamination across 4 regions (West, Central, Midwest, and East) in the. Arrow specification, as created by grid::arrow(). frame, and will be used as the layer data. Line mitre limit (number greater than 1). R geom_arrowrect-method. Line join style (round, mitre, bevel). The goal of ggarrow is to draw arrows in {ggplot2}. These start and end locations are used to determine the directions in which the arrows point. This is used to define arrow heads for geom_path. . gggenes: Draw Gene Arrow Maps in 'ggplot2'。 Github：gggens CRAN：gggenes: Draw Gene Arrow Maps in 'ggplot2' Author：Introduction to ‘gggenes’ 注意： R version >= 3. Aesthetics. rm = FALSE, show. resolution parameter (higher numbers increases the resolution)Load the mesh file (. Label, and an arrow! This next addition to our plot deserves its own subheading. )), aes (x = x, y = y, label = labs)) If you want the plot to be a little easier on the eyes and avoid plotting over. autoplot-method: Generic autoplot function geom_alignment-method: Alignment geoms for GRanges object geom_arch-method: Arch geoms for GRanges object geom_arrow-method: Arrow geoms for GRanges object geom_arrowrect-method:. total, aes (x=year, y =Emissions, colour=Scenarios), linetype="dotted",show_guide = TRUE) + geom_line (data=emissions. Hardened all input possibilities by defining the exact type of user input for every argument. (scratch. What are coordinates for S' for this translation?metR 0. fill: fill colour to use for the arrow head (if closed). names (. arrow_fins. Resizing the arrow via size= doesn't help. <code>geom_label ()</code>. It is possible to change the font size for the legend of the scale bar (argument legend_size, which defaults to 3). Not really a new feature per se, but all geoms now support the new linewidth aesthetic. Projected rectangular regions. If you wish to connect these points using geom_segment() with an arrow, the output is a little ugly, as the lines intersect the points: sg. I made arrowheadr to facilitate getting complex shapes into the box that ggarrow functions expect. The geometric object to use to display the data, either as a ggproto Geom subclass or as a string naming the geom stripped of the geom_ prefix (e. The start and end locations of the gene are expressed with the xmin and xmax aesthetics, while the molecule can be specified with the y aesthetic. Use this if you want to use contours with irregularly spaced data. . gap argument of fortify. geom_step() creates a. To draw arrows in ggplot, I use geom_segment and arrow=arrow (). geom_arrow: Arrows; geom_contour2: 2d contours of a 3d surface; geom_contour_fill: Filled 2d contours of a 3d surface; geom_contour_tanaka: Illuminated contours; geom_relief: Relief Shading; geom_streamline: Streamlines; geom_text_contour: Label contours; geopotential: Geopotential height; GeostrophicWind: Calculate. This interval is defined so that there is a specified probability that a value lies within it. Create a scatter plot and change point shapes using the argument shape : library (ggplot2) # Basic scatter plot ggplot (df, aes (x=wt, y=mpg)) + geom_point () # Change the point shape ggplot (df, aes (x=wt, y=mpg)) + geom_point (shape=18) # change shape, color, fill, size ggplot (df, aes (x=wt, y=mpg)) + geom_point (shape. Use stat_smooth () if you want. The North arrow behind the “N” north symbol can also be adjusted for its length (arrow_length), its distance to the scale (arrow_distance), or the size the N north symbol itself (arrow_north_size, which defaults t geom_segment arrow direction. The following can be used as parameters or aesthetics. Functions that return functions suitable to use as the breaks argument in ggplot2's continuous scales and in geom_contour_fill. NULL means use colour aesthetic. Use coordinate data with coord_sf() geom_spatial_rect() geom_spatial_tile() StatSpatialRect StatSpatialTile. Add supplementary data to a plot. Source: R/MakeBreaks. It’s possible to add arrowheads or flat ends to the line segments, using arrow () from the grid package. R stat_aggregate. geom_line() connects them in order of the variable on the x axis. annotate hline in ggplot with arrow. R geom_rect-method.