显示序列

本节将通过RULE的使用来绘制序列文本，并对基底着色。我们将使用等宽字体(mono)

label_font = mono

案例文本格式

单位点碱基信息，data/6/sequence.txt (20,000 entries)

# sequence.txt
...
hs1 2 2 C
hs1 3 3 A
hs1 4 4 A
...

和data/6/sequence.long.txt (100,000 entries).

# sequence.long.txt
...
hs1 1 1 A
hs1 1 1 C
hs1 1 1 A
hs1 1 1 G
hs1 2 2 T
hs1 2 2 A
hs1 2 2 C
hs1 2 2 T
...

实现文本操控条件

最好还是使用外部文件来控制：然后用include。

<plots>

# default values for all <plot> blocks
type       = text
color      = black
label_font = mono
label_size = 32
# radial padding
rpadding   = 0.2r

<plot>

file       = data/6/sequence.txt
r1         = 0.9r
r0         = 0.3r
label_size = 16
# angular padding
padding    = -0.25r                     #padding是负数的时候堆叠更加紧密

<rules>
<<include rule.textcolor.conf>>
</rules>

</plot>

</plots>

控制字体颜色：

<rule>
condition = var(value) eq "A"
color     = red
</rule>
<rule>

condition = var(value) eq "T"
color     = blue
</rule>
<rule>

condition = var(value) eq "C"
color     = green
</rule>

调整字体大小：

<rule>
# If the text is not A, then hide it. When this rule triggers,
# other rules are not evaluated.
condition  = var(value) ne "A"
show       = no
</rule>

# This rule is applied to any text that didn't pass the previous
# rule (i.e. only A). The label is set to a random value between
# 12 and 48. The rand() function returns a uniformly sampled
# random value in the interval [0,1).

<rule>
condition  = 1
label_size = eval(12+32*rand())
</rule>

官方conf [here]