fortplot

Fortran plotting. No dependencies. PNG/PDF/ASCII output.

Install

fpm:

[dependencies]
fortplot = { git = "https://github.com/lazy-fortran/fortplot" }

CMake: (full template)

include(FetchContent)
FetchContent_Declare(fortplot
    GIT_REPOSITORY https://github.com/lazy-fortran/fortplot
    GIT_TAG main)
FetchContent_MakeAvailable(fortplot)
target_link_libraries(your_target PRIVATE fortplot::fortplot)

Usage

use fortplot

call figure()
call plot(x, sin(x), label="sin(x)")
call title("Plot")
call savefig("plot.png")

Object-oriented API (for multiple independent figures):

type(figure_t) :: fig
call fig%initialize(800, 600)
call fig%add_plot(x, y, label="data")
call fig%savefig("plot.png")

Plot Types

call plot(x, y, "r--o")                              ! line
call scatter(x, y, s=sizes, c=colors)                ! scatter
call errorbar(x, y, yerr=err)                        ! error bars
call contour(x, y, z)                                ! contour
call pcolormesh(x, y, z, colormap="viridis")         ! heatmap
call bar(labels, values)                             ! bar chart
call hist(data, bins=20)                             ! histogram
call polar(theta, r)                                 ! polar
call add_3d_plot(x, y, z)                            ! 3D line
call streamplot(x, y, u, v)                          ! vector field

Styling

! Format: "color linestyle marker" e.g. "r--o" = red dashed circles
! Colors: r g b c m y k w
! Lines: - -- : -.
! Markers: o s x + * D

call xlim(0.0_wp, 10.0_wp)
call set_xscale("log")
call title("Greek: \\alpha \\beta \\gamma")          ! LaTeX

Output

call savefig("plot.png")   ! raster
call savefig("plot.pdf")   ! vector
call savefig("plot.txt")   ! ASCII
call show()                ! viewer

Animation

use fortplot_animation

anim = FuncAnimation(update_frame, frames=100, interval=50, fig=fig)
call anim%save("movie.mp4", fps=24, status=status)

Requires ffmpeg: apt install ffmpeg / brew install ffmpeg / choco install ffmpeg

Build

make build    # or: fpm build
make test
make example

Examples

Gallery with images