Circos > Documentation > Tutorials > Scaling > Zooming
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Circos at the EMBO NGS workshop in Tunis, Sept 15–25.

Use the latest version of Circos and read Circos best practices—these list recent important changes and identify sources of common problems.
If you are having trouble, post your issue to the Circos Google Group and include all files and detailed error logs. Please do not email me directly unless it is urgent—you are much more likely to receive a timely reply from the group.
Don't know what question to ask? Read Points of View: Visualizing Biological Data by Bang Wong, myself and invited authors from the Points of View series.

7 — Axis Scaling

4. Creating Zoomed Regions

circos.conf


<<include etc/colors_fonts_patterns.conf>>

<<include ideogram.conf>>
<<include ticks.conf>>

karyotype = data/karyotype/karyotype.human.txt

<image>
<<include etc/image.conf>>
</image>

<zooms>
<zoom>
chr    = hs1
start  = 100u
end    = 120u
scale  = 2
</zoom>
<zoom>
chr    = hs1
start  = 120u
end    = 130u
scale  = 3
</zoom>
<zoom>
chr    = hs1
start  = 130u
end    = 140u
scale  = 5
</zoom>
<zoom>
chr    = hs1
start  = 140u
end    = 142.5u
scale  = 10
</zoom>
<zoom>
chr    = hs2
start  = 100u
end    = 120u
scale  = 0.5
</zoom>
<zoom>
chr    = hs2
start  = 120u
end    = 140u
scale  = 0.25
</zoom>
<zoom>
chr    = hs2
start  = 140u
end    = 160u
scale  = 0.1
</zoom>
<zoom>
chr    = hs2
start  = 160u
end    = 180u
scale  = 0.25
</zoom>
<zoom>
chr    = hs2
start  = 180u
end    = 200u
scale  = 0.5
</zoom>
</zooms>

chromosomes_units = 1000000
chromosomes = hs1;hs2
chromosomes_display_default = no

<plots>
<plot>
type  = heatmap
file  = data/7/heatmap.zoom-01.txt
r1    = 0.95r
r0    = 0.90r
color = spectral-9-div
stroke_color     = black
stroke_thickness = 1
scale_log_base   = 0.33
</plot>
</plots>

<<include etc/housekeeping.conf>>

bands.conf

show_bands            = no
fill_bands            = yes
band_stroke_thickness = 2
band_stroke_color     = white
band_transparency     = 3

breaks.conf

axis_break_at_edge = yes
axis_break         = yes
axis_break_style   = 2

<break_style 1>
stroke_color     = black
fill_color       = blue
thickness        = 0.25r
stroke_thickness = 2
</break_style>

<break_style 2>
stroke_color     = black
stroke_thickness = 2
thickness        = 2r
</break_style>

ideogram.conf


<ideogram>

<spacing>
default = 0.005r
break   = 0.5r

<<include breaks.conf>>

</spacing>

<<include ideogram.position.conf>>
<<include ideogram.label.conf>>
<<include bands.conf>>

</ideogram>

ideogram.label.conf

show_label       = yes
label_font       = default
label_radius     = dims(image,radius) - 50p
label_size       = 36
label_parallel   = yes
label_case       = lower
label_format     = eval(sprintf("chr%s",var(label)))

ideogram.position.conf

radius           = 0.90r
thickness        = 50p
fill             = yes
fill_color       = black
stroke_thickness = 2
stroke_color     = black

ticks.conf


show_ticks          = yes
show_tick_labels    = yes

<ticks>
tick_separation  = 3p
label_separation = 10p
radius           = dims(ideogram,radius_outer)
multiplier       = 1e-6
color            = black
thickness        = 2p
label_offset     = 5p
format           = %d

<tick>
#chromosomes_display_default = no
chromosomes    = -hs9
spacing        = 0.5u
show_label     = no
size           = 6p
</tick>

<tick>
spacing        = 1u
show_label     = yes
label_size     = 16p
size           = 10p
</tick>

<tick>
spacing        = 5u
show_label     = yes
label_size     = 18p
size           = 14p
</tick>

<tick>
spacing        = 10u
show_label     = yes
label_size     = 20p
size           = 18p
</tick>

<tick>
spacing        = 20u
show_label     = yes
label_size     = 24p
size           = 22p
</tick>

<tick>
spacing        = 100u
show_label     = yes
label_size     = 24p
size           = 22p
</tick>

</ticks>