contour

Makie.contour Function

contour(x, y, z)
contour(z::Matrix)

Creates a contour plot of the plane spanning x::Vector, y::Vector, z::Matrix. If only z::Matrix is supplied, the indices of the elements in z will be used as the x and y locations when plotting the contour.

x and y can also be Matrices that define a curvilinear grid, similar to how surface works.

Plot type

The plot type alias for the contour function is Contour.

source

Examples

using CairoMakie
f = Figure()
Axis(f[1, 1])

xs = LinRange(0, 10, 100)
ys = LinRange(0, 15, 100)
zs = [cos(x) * sin(y) for x in xs, y in ys]

contour!(xs, ys, zs)

f

Omitting the xs and ys results in the indices of zs being used. We can also set arbitrary contour-levels using levels

using CairoMakie
f = Figure()
Axis(f[1, 1])

xs = LinRange(0, 10, 100)
ys = LinRange(0, 15, 100)
zs = [cos(x) * sin(y) for x in xs, y in ys]

contour!(zs,levels=-1:0.1:1)

f

One can also add labels and control label attributes such as labelsize, labelcolor or labelfont.

using CairoMakie
himmelblau(x, y) = (x^2 + y - 11)^2 + (x + y^2 - 7)^2
x = y = range(-6, 6; length=100)
z = himmelblau.(x, y')

levels = 10.0.^range(0.3, 3.5; length=10)
colorscale = ReversibleScale(x -> x^(1 / 10), x -> x^10)
f, ax, ct = contour(x, y, z; labels=true, levels, colormap=:hsv, colorscale)
f

Curvilinear grids

contour also supports curvilinear grids, where x and y are both matrices of the same size as z. This is similar to the input that surface accepts.

Let's warp a regular grid of x and y by some nonlinear function, and plot its contours:

using CairoMakie
x = -10:10
y = -10:10
# The curvilinear grid:
xs = [x + 0.01y^3 for x in x, y in y]
ys = [y + 10cos(x/40) for x in x, y in y]

# Now, for simplicity, we calculate the `zs` values to be
# the radius from the center of the grid (0, 10).
zs = sqrt.(xs .^ 2 .+ (ys .- 10) .^ 2)

# We can use Makie's tick finders to get some nice looking contour levels:
levels = Makie.get_tickvalues(Makie.LinearTicks(7), extrema(zs)...)

# and now, we plot!
fig, ax, srf = surface(xs, ys, fill(0f0, size(zs)); color=zs, shading = NoShading, axis = (; type = Axis, aspect = DataAspect()))
ctr = contour!(ax, xs, ys, zs; color = :orange, levels = levels, labels = true, labelfont = :bold, labelsize = 12)

fig

Attributes

alpha

Defaults to 1.0

The alpha value of the colormap or color attribute. Multiple alphas like in plot(alpha=0.2, color=(:red, 0.5), will get multiplied.

clip_planes

Defaults to automatic

Clip planes offer a way to do clipping in 3D space. You can set a Vector of up to 8 Plane3f planes here, behind which plots will be clipped (i.e. become invisible). By default clip planes are inherited from the parent plot or scene. You can remove parent clip_planes by passing Plane3f[].

color

Defaults to nothing

The color of the contour lines. If nothing, the color is determined by the numerical values of the contour levels in combination with colormap and colorrange.

colormap

Defaults to @inherit colormap :viridis

Sets the colormap that is sampled for numeric colors. PlotUtils.cgrad(...), Makie.Reverse(any_colormap) can be used as well, or any symbol from ColorBrewer or PlotUtils. To see all available color gradients, you can call Makie.available_gradients().

colorrange

Defaults to automatic

The values representing the start and end points of colormap.

colorscale

Defaults to identity

The color transform function. Can be any function, but only works well together with Colorbar for identity, log, log2, log10, sqrt, logit, Makie.pseudolog10 and Makie.Symlog10.

depth_shift

Defaults to 0.0

adjusts the depth value of a plot after all other transformations, i.e. in clip space, where 0 <= depth <= 1. This only applies to GLMakie and WGLMakie and can be used to adjust render order (like a tunable overdraw).

enable_depth

Defaults to true

No docs available.

fxaa

Defaults to true

adjusts whether the plot is rendered with fxaa (anti-aliasing, GLMakie only).

highclip

Defaults to automatic

The color for any value above the colorrange.

inspectable

Defaults to true

sets whether this plot should be seen by DataInspector.

inspector_clear

Defaults to automatic

Sets a callback function (inspector, plot) -> ... for cleaning up custom indicators in DataInspector.

inspector_hover

Defaults to automatic

Sets a callback function (inspector, plot, index) -> ... which replaces the default show_data methods.

inspector_label

Defaults to automatic

Sets a callback function (plot, index, position) -> string which replaces the default label generated by DataInspector.

joinstyle

Defaults to @inherit joinstyle

No docs available.

labelcolor

Defaults to nothing

Color of the contour labels, if nothing it matches color by default.

labelfont

Defaults to @inherit font

The font of the contour labels.

labelformatter

Defaults to contour_label_formatter

Formats the numeric values of the contour levels to strings.

labels

Defaults to false

If true, adds text labels to the contour lines.

labelsize

Defaults to 10

Font size of the contour labels

levels

Defaults to 5

Controls the number and location of the contour lines. Can be either

• an Int that produces n equally wide levels or bands

• an AbstractVector{<:Real} that lists n consecutive edges from low to high, which result in n-1 levels or bands

linecap

Defaults to @inherit linecap

No docs available.

linestyle

Defaults to nothing

No docs available.

linewidth

Defaults to 1.0

No docs available.

lowclip

Defaults to automatic

The color for any value below the colorrange.

miter_limit

Defaults to @inherit miter_limit

No docs available.

model

Defaults to automatic

Sets a model matrix for the plot. This overrides adjustments made with translate!, rotate! and scale!.

nan_color

Defaults to :transparent

The color for NaN values.

overdraw

Defaults to false

Controls if the plot will draw over other plots. This specifically means ignoring depth checks in GL backends

space

Defaults to :data

sets the transformation space for box encompassing the plot. See Makie.spaces() for possible inputs.

ssao

Defaults to false

Adjusts whether the plot is rendered with ssao (screen space ambient occlusion). Note that this only makes sense in 3D plots and is only applicable with fxaa = true.

transformation

Defaults to automatic

No docs available.

transparency

Defaults to false

Adjusts how the plot deals with transparency. In GLMakie transparency = true results in using Order Independent Transparency.

visible

Defaults to true

Controls whether the plot will be rendered or not.