https://github.com/pazner/triplot.jl

Triangular contour and pseudocolor plots in Julia
https://github.com/pazner/triplot.jl

julia plotting tricontour tripcolor

Last synced: 5 months ago
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Triangular contour and pseudocolor plots in Julia

• Host: GitHub
• URL: https://github.com/pazner/triplot.jl
• Owner: pazner
• License: unlicense
• Created: 2020-12-30T17:47:54.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2021-01-26T05:44:59.000Z (about 5 years ago)
• Last Synced: 2025-03-26T06:43:34.747Z (11 months ago)
• Topics: julia, plotting, tricontour, tripcolor
• Language: Julia
• Homepage:
• Size: 692 KB
• Stars: 8
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.adoc
  • License: LICENSE

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README

          
= Triplot.jl

This package provides functionality for drawing contour lines, filled contour

regions, and pseudocolor plots for data defined on unstructured triangular

meshes in Julia. The plotting functionality is based on

https://gr-framework.org[GR]. The contouring algorithm is inspired by

https://matplotlib.org[matplotlib].

== Usage

Triplot.jl provides three plotting functions: `tricontour`, `tricontourf`, and

`tripcolor`.

Each of these functions takes `x`, `y`, `z`, and `t` arrays. `x`, `y`, and `z`

are one-dimensional arrays of length `nv`, where `nv` is the number of vertices

in the triangular mesh. `x` and `y` define the coordinates of the vertices, and

`z` defines the function values at each vertex.

The array `t` is an integer array of size `(3,nt)`, where `nt` is the number of

triangles in the mesh. `t[i,j]` is the index of the ``i``th vertex of the

``j``th triangle, and so `(x[t[i,j]], y[t[i,j]])` are its coordinates.

`tricontour` and `tricontourf` take a `levels` argument, that can either be an

integer (for evenly spaced levels between the data bounds), or an array of

values corresponding to contour lines. `tricontourf` will fill the regions

defined _between_ contour lines.

`tripcolor` generates a rasterized pseudocolor plot. The range used to compute

the pseudocolor values can be set by specifying `zmin` and `zmax` values (if

none are provided, the extremal values of the `z` array will be used).

Coloring is done using the current colormap in GR. This colormap can be set to

one of the built-in colormaps using `GR.setcolormap`, or it can be set to a

custom colormap using `GR.setcolormapfromrgb`. This is illustrated in the

example `ex_contour.jl` in order to draw contour lines of a uniform color.

== Examples

Some simple examples are provided in `examples/ex_contour.jl` and `examples/ex_pcolor.jl`.

=== Contours

image::img/diag.png[diag,500,500]

image::img/peaks.png[peaks,500,500]

image::img/sine.png[sine,500,500]

=== Pseudocolor

image::img/sine_pcolor.png[sine_pcolor,500,500]

image::img/basis.png[basis,500,500]

image::img/dolphin.png[dolphin,500,500]