blocks|key|2717430|text|point+geom是用来创建散点图的，它看起来并不是用来做你需要的事情的，比如，显示自定义图像。然而，here回答了一个类似的问题，这表明该问题可以通过以下步骤解决：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2717431|(1)读取您想要展示的自定义图片。|2717432|(2)使用rasterGrob()函数在给定的位置、大小和方向渲染栅格对象。|style|CODE|2717433|(3)使用qplot()等绘图功能，|2717434|(4)使用annotation_custom()这样的geom作为静态注释，指定user20650提到的x和y限制的粗略调整。|2717435|使用下面的代码，我可以获得两个自定义图像img1.png和img2.png，它们分别位于给定的xmin、xmax、ymin和ymax处。|2717436|library(png)
library(ggplot2)
library(gridGraphics)
setwd("c:/MyFolder/")

img1+<-+readPNG("img1.png")
img2+<-+readPNG("img2.png")
g1+<-+rasterGrob(img1,+interpolate=FALSE)
g2+<-+rasterGrob(img2,+interpolate=FALSE)
qplot(1:10,+1:10,+geom="blank")+%2B+
++annotation_custom(g1,+xmin=1,+xmax=3,+ymin=1,+ymax=3)+%2B
++annotation_custom(g2,+xmin=7,+xmax=9,+ymin=7,+ymax=9)+%2B++
++geom_point()|code-block|syntax|javascript|2717437|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/9917049/inserting-an-image-to-ggplot2?lq=1^0|1G|4|0|0|0|5|C|0|5|7|0|5|J|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|17|8|@$A|18|B|19|H|I]]|9|@]|C|$]]|$1|J|3|K|5|6|7|1A|8|@$A|1B|B|1C|H|I]]|9|@]|C|$]]|$1|L|3|M|5|6|7|1D|8|@$A|1E|B|1F|H|I]]|9|@]|C|$]]|$1|N|3|O|5|6|7|1G|8|@]|9|@]|C|$]]|$1|P|3|Q|5|R|7|1H|8|@]|9|@]|C|$S|T]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

The point geom is used to create scatterplots, and doesn't quite seem to be designed to do what you need, ie, display custom images. However, a similar question was answered <a href="https://stackoverflow.com/questions/9917049/inserting-an-image-to-ggplot2?lq=1">here</a>, which indicates that the problem can be solved in the following steps: 

(1) Read the custom images you want to display, 

(2) Render raster objects at the given location, size, and orientation using the <code>rasterGrob()</code> function, 

(3) Use a plotting function such as <code>qplot()</code>, 

(4) Use a geom such as <code>annotation_custom()</code> for use as static annotations specifying the crude adjustments for x and y limits as mentioned by user20650. 

Using the code below, I could get two custom images img1.png and img2.png positioned at the given xmin, xmax, ymin, and ymax.

<pre><code>library(png)
library(ggplot2)
library(gridGraphics)
setwd("c:/MyFolder/")

img1 &lt;- readPNG("img1.png")
img2 &lt;- readPNG("img2.png")
g1 &lt;- rasterGrob(img1, interpolate=FALSE)
g2 &lt;- rasterGrob(img2, interpolate=FALSE)
qplot(1:10, 1:10, geom="blank") + 
 annotation_custom(g1, xmin=1, xmax=3, ymin=1, ymax=3) +
 annotation_custom(g2, xmin=7, xmax=9, ymin=7, ymax=9) + 
 geom_point()
</code></pre>

blocks|key|2717444|text|DL+Miller提供了另一种使用ggproto()的解决方案。https://github.com/dill/emoGG|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2717445|library(ggplot2)
library(grid)
library(EBImage)
img+<-+readImage(system.file("img",+"Rlogo.png",+package+=+"png"))
RlogoGrob+<-+function(x,+y,+size,+img)+{
++++rasterGrob(x+=+x,+y+=+y,+image+=+img,+default.units+=+"native",+height+=+size,+
++++++++width+=+size)
}

GeomRlogo+<-+ggproto("GeomRlogo",+Geom,+draw_panel+=+function(data,+panel_scales,+
++++coord,+img,+na.rm+=+FALSE)+{
++++coords+<-+coord$transform(data,+panel_scales)
++++ggplot2:::ggname("geom_Rlogo",+RlogoGrob(coords$x,+coords$y,+coords$size,+
++++++++img))
},+non_missing_aes+=+c("Rlogo",+"size"),+required_aes+=+c("x",+"y"),+default_aes+=+aes(size+=+0.05),+
++++icon+=+function(.)+{
++++},+desc_params+=+list(),+seealso+=+list(geom_point+=+GeomPoint$desc),+
++++examples+=+function(.)+{
++++})

geom_Rlogo+<-+function(mapping+=+NULL,+data+=+NULL,+stat+=+"identity",+
++++position+=+"identity",+na.rm+=+FALSE,+show.legend+=+NA,+inherit.aes+=+TRUE,+
++++...)+{
++++layer(data+=+data,+mapping+=+mapping,+stat+=+stat,+geom+=+GeomRlogo,+
++++++++position+=+position,+show.legend+=+show.legend,+inherit.aes+=+inherit.aes,+
++++++++params+=+list(na.rm+=+na.rm,+img+=+img,+...))
}
ggplot(mtcars,+aes(wt,+mpg))%2Bgeom_Rlogo()|code-block|syntax|javascript|2717446|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/dill/emoGG^0|H|9|W|T|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

DL Miller provided another solution using <code>ggproto()</code>.<a href="https://github.com/dill/emoGG" rel="noreferrer">https://github.com/dill/emoGG</a>

<pre><code>library(ggplot2)
library(grid)
library(EBImage)
img &lt;- readImage(system.file("img", "Rlogo.png", package = "png"))
RlogoGrob &lt;- function(x, y, size, img) {
 rasterGrob(x = x, y = y, image = img, default.units = "native", height = size, 
 width = size)
}

GeomRlogo &lt;- ggproto("GeomRlogo", Geom, draw_panel = function(data, panel_scales, 
 coord, img, na.rm = FALSE) {
 coords &lt;- coord$transform(data, panel_scales)
 ggplot2:::ggname("geom_Rlogo", RlogoGrob(coords$x, coords$y, coords$size, 
 img))
}, non_missing_aes = c("Rlogo", "size"), required_aes = c("x", "y"), default_aes = aes(size = 0.05), 
 icon = function(.) {
 }, desc_params = list(), seealso = list(geom_point = GeomPoint$desc), 
 examples = function(.) {
 })

geom_Rlogo &lt;- function(mapping = NULL, data = NULL, stat = "identity", 
 position = "identity", na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, 
 ...) {
 layer(data = data, mapping = mapping, stat = stat, geom = GeomRlogo, 
 position = position, show.legend = show.legend, inherit.aes = inherit.aes, 
 params = list(na.rm = na.rm, img = img, ...))
}
ggplot(mtcars, aes(wt, mpg))+geom_Rlogo()
</code></pre>

Is it possible to display custom image (say png format) as geom_point in R ggplot? 

<pre><code>library(png)
pic1 &lt;- readPNG("pic1.png")

png("Heatmap.png", units="px", width=3200, height=3200, res=300)
ggplot(data_frame, aes(medium, day, fill = Transactions)) +
 geom_tile(colour="white") +
 facet_grid(dime3_year~dime3_month) + 
 scale_fill_gradient(high="blue",low="white") +
 theme_bw() + 
 geom_point(aes(dime3_channel, day, size=Conv,alpha=Conv,image=(annotation_raster(pic1,xmin=0,ymin=0,xmax=5,ymax=5)),color="firebrick")) +
</code></pre>

Gives error:

<blockquote>
 Don't know how to automatically pick scale for object of type
 proto/environment. Defaulting to continuous Error: Aesthetics must
 either be length one, or the same length as the
 dataProblems:(annotation_raster(conv_pic, xmin = 0, ymin = 0, xmax =
 5, ymax = 5))
</blockquote>

Display custom image as geom_point

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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是否可以在R ggplot中将自定义图像(例如png格式)显示为geom_point？library(png)pic1 <- readPNG("pic1.png")png("Heatmap.png", units="px", width=3200, height=3200, res=300)ggplot(data_fr...

问将自定义图像显示为geom_point
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问将自定义图像显示为geom_point
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