complexheatmap，一个强大的画热图的包

如果是画简单的热图可以用pheatmap，上手简单，网上教程特别多，画出来很好看（pheatmap缺点：legend位置不可改；colnames和rownames位置不可改，字体大小可改；可在最上面的位置加注释，左右下不可加注释，注释形式只能是颜色，文本和图形都不可以加；可以按行列加gap，便于看分组信息；可以在cell里显示数值大小，数值可以控制小数点位数）
为什么要用complexheatmap？我们看看他强大的功能：

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如果你的图需要：

行注释,列注释都有或者其一; 在heatmap四周注释各种图或者文本
画了好几个热图要拼起来（我试过cow_plot,ggarrange总是失败，如果大家成功了可以教我）
图例和注释的图例位置或者方向调整
-画分类型变量

complexheatmap用起来！

1.行列注释：

这个柱子可以换成文本或者图

ha = HeatmapAnnotation(df = df, which = "row", width = unit(1, "cm"))
ht1 = Heatmap(mat, name = "ht1")
ht1 + ha + ht1

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ht1 = Heatmap(mat, name = "ht1", km = 2)
ha_boxplot = HeatmapAnnotation(boxplot = anno_boxplot(mat, which = "row"), 
    which = "row", width = unit(2, "cm"))
draw(ha_boxplot + ht1, row_hclust_side = "left", row_sub_title_side = "right")

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ha_column1 = HeatmapAnnotation(points = anno_points(rnorm(10)))
ht1 = Heatmap(mat, name = "ht1", km = 2, row_title = "Heatmap 1", column_title = "Heatmap 1", 
   top_annotation = ha_column1)

ha_column2 = HeatmapAnnotation(df = data.frame(type = c(rep("a", 5), rep("b", 5))))
ht2 = Heatmap(mat, name = "ht2", row_title = "Heatmap 2", column_title = "Heatmap 2",
   bottom_annotation = ha_column2)

ht_list = ht1 + ht2
draw(ht_list, row_title = "Heatmap list", column_title = "Heatmap list", 
   heatmap_legend_side = "right", annotation_legend_side = "left")

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2.把多个heatmap拼起来，还可以自己调图之间的间距，图的大小

ha = HeatmapAnnotation(points = anno_points(rnorm(10)))
ht2 = Heatmap(mat, name = "ht2", column_title = "Heatmap 2", top_annotation = ha, show_heatmap_legend = FALSE)
lgd = legendGrob(c("dots"), pch = 16)
draw(ht1 + ht2, annotation_legend_list = list(lgd))

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调间距：

draw(ht_list + ht_list, gap = unit(c(3, 6, 9, 0), "mm"))

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调大小

ht1 = Heatmap(mat, name = "ht1", column_title = "Heatmap 1")
ht2 = Heatmap(mat, name = "ht2", column_title = "Heatmap 2", width = unit(5, "cm"))
ht1 + ht2

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3.图例方向调整

df = data.frame(type = c(rep("a", 5), rep("b", 5)))
ha = HeatmapAnnotation(df = df, col = list(type = c("a" =  "red", "b" = "blue")))

ht1 = Heatmap(mat, name = "ht1", column_title = "Heatmap 1", top_annotation = ha)
ht2 = Heatmap(mat, name = "ht2", column_title = "Heatmap 2")
ht_list = ht1 + ht2

draw(ht_list)

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draw(ht_list, heatmap_legend_side = "left", annotation_legend_side = "bottom")

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