在geom_tile中的特定区域周围绘制线 [英] draw lines around specific areas in geom_tile

问题描述

我有以下数据框(df1)，它从中生成了geom_tile图.

I have the following data frame (df1) which i generated a geom_tile plot from it.

X Y Z
1 1 0.343
5 4 0.134
10 6 0.564
20 8 0.532
40 9 0.235
46 12 0.425

，我还有另一个数据框，我想用它来画线(df2):

and i have another data frame which i want to use to draw the lines (df2):

a b c     d
1 1 0.05 good
5 4 0.01 better
10 6 0.03 middle
20 8 0.1  bad
40 9 0.2  bad
46 12 0.22 bad

因此，想法是a和X相同，并且b和Y是相同的值.

so the idea, is that a and X are the same and b and Y are the same values.

我要做的是根据df2中d的值在geom_tile区域周围绘制一些线.因此在每个不同的区域都会有不同的色线，例如(好是红色，更好是蓝色，...)

what i want to do is to draw some lines around the geom_tile areas depending on the value of d in df2. so in each different area there will be a different color line e.g (good is red, better is blue, ...)

我尝试使用geom_contour，但问题是它以非常难看的方式绘制线条，并且我无法以一种很好的方式指定坐标..

i tried to use geom_contour but the problem it draws lines in a very ugly way and i wasn't able to specify coordinates in a good way ..

注意

Note

• 某些区域可能不是直线的
• 数据帧更大，这是一个测试数据，可以解释这个想法

推荐答案

我建议首先将两个数据框合并在一起，因为它们在两列中具有相同的值.

I would suggest, first, to merge both data frame together as they have the same values in two columns.

 df.new<-merge(df1,df2,by.x=c("X","Y"),by.y=c("a","b"))
 df.new
   X  Y     Z    c      d
1  1  1 0.343 0.05   good
2 10  6 0.564 0.03 middle
3 20  8 0.532 0.10    bad
4 40  9 0.235 0.20    bad
5 46 12 0.425 0.22    bad
6  5  4 0.134 0.01 better

然后在aes()中为Z(如果需要)和color=d设置fill=. geom_tile()中的size=2将确保瓷砖周围的线条更清晰可见.

Then in aes() set fill= for the Z (if necessary) and color=d. size=2 in geom_tile() will ensure that lines around tiles are better visible.

 ggplot(df.new,aes(X,Y,fill=Z,color=d))+geom_tile(size=2)

也可以在不合并数据帧的情况下获得类似的结果-您应该使用两个geom_tile()调用(每个数据帧一个)，然后在第二个geom_tile()(已设置颜色)中在aes()之外添加fill=NA.

Similar results can be achieved also without merging data frame - you should use two geom_tile() calls (one for each data frame) and in second geom_tile() (where color is set) add fill=NA outside aes().

ggplot()+geom_tile(data=df1,aes(X,Y,fill=Z))+
         geom_tile(data=df2,aes(a,b,color=d),size=2,fill=NA)

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