CODEWITHSUNDEEP
plotopacityjuliagadfly
Marvin Ward Jr
Marvin Ward Jr

Reputation: 1029

Color Opacity with Gadfly

Is it possible to control the alpha property (opacity, or transparency) when plotting with Gadfly? I am attempting to plot a comparison of distributions. Any info would be appreciated.

Upvotes: 4

Views: 1168

Answers (2)

emonigma
emonigma

Reputation: 4406

It is possible with Geom.ribbon. The following code copy-pastes the plot from nabble.com and uses the Geom.ribbon opacity issue on Github:

using Gadfly, DataFrames, Distributions
d1 = Normal(-1);
d2 = Normal(1);
x = -4:0.01:4
y1 = pdf(d1, x);
y2 = pdf(d2, x);
df1 = DataFrame(x = x, y = y1, ymin = 0.0, ymax = y1, d = "d1");
df2 = DataFrame(x = x, y = y2, ymin = 0.0, ymax = y2, d = "d2");
df = vcat(df1, df2)

# No transparency
p1 = plot(df, x = :x, y = :y, ymin = :ymin, ymax = :ymax, color = :d, Geom.line, Geom.ribbon)

# With transparency
p2 = plot(df, x = :x, y = :y, ymin = :ymin, ymax = :ymax, color = :d, Geom.line, Geom.ribbon),
          Theme(lowlight_color=c->RGBA{Float32}(c.r, c.g, c.b, 0.2)))

draw(PNG("test1.png", 12cm, 6cm), p1)
draw(PNG("test2.png", 12cm, 6cm), p2)

Plot without transparency:

Plot without transparency

Plot with transparency:

Plot with transparency

Upvotes: 0

IainDunning
IainDunning

Reputation: 11654

Not yet, but it is a planned feature that seems close to being added.

Upvotes: 1

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