将图像(png文件)添加到用R创建的pdf文件的标题中 [英] Add image (png file) to header of pdf file created with R
问题描述
我试图在我用ggplot创建的图形pdf报告的标题中添加一个.png图像(徽标),并将其打印为pdf。
以下示例演示如何将图像 添加到ggplot 图中。但是,我正在寻找将.png图像添加到位于ggplot区域之外的pdf标题。
# - -------------------------------------------------- ----------------------------
#示例png文件
#--------- -------------------------------------------------- --------------------
library(reshape2)
library(png)
mypngfile = download.file('http:/ /api.altmetric.com/donut/502878_64x64.png',
destfile ='mypng.png',mode ='wb')
mypng = readPNG('mypng.png')
#--------------------------------------------- ----------------------------------
#使用ggplot $ b的mtcars数据框创建示例图$ b#----------------------------------------------- --------------------------------
library(ggplot2)
p.example = qplot( mpg,wt,data = mtcars)+
annotation_raster(mypng,ymin = 4.5,ymax = 5,xmin = 30,xmax = 35)
#-------- -------------------------------- ---------------------------------------
#用脚注打印到pdf文件
#--------------------------------------------- ----------------------------------
fname =C:/ temp / my report.pdf
pdf(fname,10.75,6.5,onefile = TRUE,paper =a4r)
print(p.example)
dev.off()
$ b产生一个如下所示的pdf:
但是,我想要图片在ggplot区域外显示。或者更具体地说,我希望图像显示在报告标题(左上角)中,如以下示例所示:
我发现了以下可用于创建文本脚注的功能,但不知道如何修改它以插入.png图片。
makeFootnote< - function(footnoteText = format(Sys .time(),%d%b%Y),
size = .4,color = gray(.5))
{
require(grid)
pushViewport (viewport())
grid.text(label = footnoteText,
x = unit(1,npc) - 单位(12,mm),
y =单位(0.1, mm),
just = c(right,bottom),
gp = gpar(cex = size,col = color))
popViewport()
}
任何帮助将不胜感激。
解决方案这是一个建议,
library(ggplot2)
pre>
p.example = qplot( mpg,wt,data = mtcars)
library(grid)
library(gtable)
ann < - rasterGrob(mypng,width = unit(1,cm)) (g,grobHeight(ann),0)
g < - gtable_add_grob(g,ann,t = 1,l = 4)
grid.newpage()
grid.draw(g)
I am trying to add an .png image (logo) to the header of my pdf report of graphs created with ggplot and printed to pdf.
I found the following example how to add a image to a ggplot plot. But, I am looking to add the .png image to he header of the pdf which is outside the ggplot area.
#------------------------------------------------------------------------------- # Example png file #------------------------------------------------------------------------------- library(reshape2) library(png) mypngfile = download.file('http://api.altmetric.com/donut/502878_64x64.png', destfile = 'mypng.png', mode = 'wb') mypng = readPNG('mypng.png') #------------------------------------------------------------------------------- # create example plot using mtcars data frame from ggplot #------------------------------------------------------------------------------- library(ggplot2) p.example = qplot(mpg, wt, data = mtcars) + annotation_raster(mypng, ymin = 4.5, ymax= 5, xmin = 30, xmax = 35) #------------------------------------------------------------------------------- # print to pdf file with footnote #------------------------------------------------------------------------------- fname = "C:/temp/my report.pdf" pdf(fname, 10.75, 6.5, onefile=TRUE, paper="a4r") print(p.example) dev.off()
...which produces a pdf that looks like this:
But, I would like the image to show up outside the ggplot area. Or more specifically, I want the image to show up in the report header (in upper left) like the following example:
I found the following function that can be used to create a text footnote but wasn't sure how to modify it to insert a .png image.
makeFootnote <- function(footnoteText= format(Sys.time(), "%d %b %Y"), size= .4, color= grey(.5)) { require(grid) pushViewport(viewport()) grid.text(label= footnoteText , x = unit(1,"npc") - unit(12, "mm"), y = unit(0.1, "mm"), just=c("right", "bottom"), gp=gpar(cex= size, col=color)) popViewport() }
Any assistance would be greatly appreciated.
解决方案here's a suggestion,
library(ggplot2) p.example = qplot(mpg, wt, data = mtcars) library(grid) library(gtable) ann <- rasterGrob(mypng, width=unit(1,"cm"), x = unit(0.5,"cm")) g <- ggplotGrob(p.example) g <- gtable_add_rows(g, grobHeight(ann), 0) g <- gtable_add_grob(g, ann, t=1, l=4) grid.newpage() grid.draw(g)
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