7.1.3 背景

作者：Zuguang Gu8
翻译：Steven Shen
原文：https://jokergoo.github.io/ComplexHeatmap-reference/book/oncoprint.html#oncoprint-background

If alter_fun is specified as a list, the order of the elements controls the order of adding graphics. There is a special element called background which defines how to draw background and it should be always put as the first element in the alter_fun list. In following example, backgrond color is changed to light green with borders.

oncoPrint(mat,
    alter_fun = list(
        background = function(x, y, w, h) grid.rect(x, y, w, h, 
            gp = gpar(fill = "#00FF0020")),
        snv = function(x, y, w, h) grid.rect(x, y, w*0.9, h*0.9, 
            gp = gpar(fill = col["snv"], col = NA)),
        indel = function(x, y, w, h) grid.rect(x, y, w*0.9, h*0.4, 
            gp = gpar(fill = col["indel"], col = NA))
    ), col = col)

Or just remove the background (don’t set it to NULL. Setting background directly to NULL means to use the default style of background whch is in grey):

oncoPrint(mat,
    alter_fun = list(
        background = function(...) NULL,
        snv = function(x, y, w, h) grid.rect(x, y, w*0.9, h*0.9, 
            gp = gpar(fill = col["snv"], col = NA)),
        indel = function(x, y, w, h) grid.rect(x, y, w*0.9, h*0.4, 
            gp = gpar(fill = col["indel"], col = NA))
    ), col = col)