4.1 标题

作者：Zuguang Gu8
翻译：Steven Shen
原文：https://jokergoo.github.io/ComplexHeatmap-reference/book/a-list-of-heatmaps.html#heatmap-list-titles

A heatmap list also has title which is like a global title covering all heatmaps. row_title and column_title should be set in the draw() function.

From following example, we set different colors for each heatmap to make them distinguishable.

col_rnorm = colorRamp2(c(-3, 0, 3), c("green", "white", "red"))
col_runif = colorRamp2(c(0, 3), c("white", "orange"))
col_letters = c("a" = "pink", "b" = "purple", "c" = "blue")
ht1 = Heatmap(mat1, name = "rnorm", col = col_rnorm,
    row_title = "Heatmap 1", column_title = "Heatmap 1")
ht2 = Heatmap(mat2, name = "runif", col = col_runif,
    row_title = "Heatmap 2", column_title = "Heatmap 2")
ht3 = Heatmap(le, name = "letters", col = col_letters)
ht_list = ht1 + ht2 + ht3
draw(ht_list, row_title = "Three heatmaps, row title", row_title_gp = gpar(col = "red"),
    column_title = "Three heatmaps, column title", column_title_gp = gpar(fontsize = 16))