标签间隔

如果刻度过于密集，那么标签也会变得密集。 因为标签通常是基于刻度进行绘制的，所以关闭标签的一个好方法便是像上一节一般关闭刻度。 当然我们也可以通过标签自己的方式关闭显示，我们可以定义一定最小的标签显示间距，一旦小于这个距离标签将不会显示。

<ticks>

  tick_separation  = 2p
  label_separation = 5p
  ...

  <tick>
  tick_separation  = 5p
  label_separation = 10p
    ...
  </tick>

  ...

</ticks>

同样可以通过定义的位置不同来定义局部或者是全局的设置

ideogram边缘的标签设置

<ticks>
min_label_distance_to_edge = 10p
...
<tick>
min_label_distance_to_edge = 5p
...
</tick>
...
</ticks>

当然如果tick已经被抑制了的话标签将自动不会显示

取消第一个或者最后一个标签

同上面一样，有的时候边缘（特别是首尾）我们不希望出现标签，那么便可采用以下设置

<ticks>
skip_first_label = yes
skip_last_label  = yes
...
<tick>
# will overwrite the skip_first_label for this tick group
skip_first_label = no
...
</tick>
...
</ticks>

tick.conf

show_ticks          = yes
show_tick_labels    = yes

<ticks>
radius               = dims(ideogram,radius_outer)
multiplier           = 1e-6

label_offset = 5p
thickness = 3p
size      = 20p

# ticks must be separated by 2 pixels in order
# to be displayed
tick_separation      = 2p
# Density of labels is independently controlled.
# While all tick sets have labels, only labels
# no closer than 5 pixels to nearest label will be drawn
label_separation     = 5p

<tick>
spacing        = 0.5u
color          = red
show_label     = yes
label_size     = 14p
label_offset   = 0p
format         = %.1f
</tick>

<tick>
spacing        = 1u
color          = blue
show_label     = yes
label_size     = 16p
label_offset   = 0p
format         = %d
</tick>

<tick>
spacing        = 5u
color          = green
show_label     = yes
label_size     = 20p
label_offset   = 0p
format         = %d
</tick>

<tick>
spacing        = 10u
color          = black
show_label     = yes
label_size     = 24p
label_offset   = 5p
format         = %d
</tick>

</ticks>

官方完整conf here