Source: streamplot_demo.f90
Streamplots for 2D vector fields.
streamplot_demo.f90 - Source codeoutput/example/fortran/streamplot_demo/make example ARGS="streamplot_demo"

ASCII output:
Streamline Plot Demo - With Arrows
+--------------------------------------------------------------------------------+
| 2.0 |
| | \ > > > > / |
| | \ ⣀⠤⠂ ⢀⡠⠔ ⣀⡠⠤⠔⠂ ⣀⡠⠤⠤⠤⠤⠤⠔⠒⠂ ⠒⠒⠤⠤⠤⣀⣀ ⠐⠢⠤⢄⣀ ⠒⠤⣀ / |
| | ⢀⠤⠊ \ ⢀⡠⠔⠊⠁⢀⡠⠔⠊⠉⣀⡠⠤⠒⠊⠉ ⣀⠤⠔⠒⠒⠒⠒⠒⠉⠉⠉⠑⠒⠒⠒⠒⠒⠢⠤⠄ ⠉⠉⠒⠢⠤⣀⡉⠑⠒⠤⣀ ⠉⠒⠤⡀ ⠑⠤⡀ |
| 1.5 ⠁ ⢀⠔⠊⠁ ⠈⢁⡠⠔⠊⠉ ⣀⣀⣀⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⢄⣀⣀⡀ ⠈⠑⠒⠤⣀⠑⠢⢄ ⠈⠑⠢⡀ ⠈⠢⢄ |
| | ⡠⠊⠁ ⣀⠔⠊⠁ ⢀⣀⠤⠔⠊⠉⠉ ⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⡀ ⠈⠉⠑⠒⠤⢄⡀ ⠑⠢⡀ ⠈⠑⢄ ⠁ |
| | ⡠⠊ ⡠⠊⢀⠤⠊ ⢀⠤⠊⠁ ⣀⡠⠔⠒⠊⠉⠉ ⠈⠉⠉⠒⠒⠤⣀⡀ ⠈⠉⠒⠤⣀ ⠐⠤⡀⠈⠒⢄ ⠑⢄ |
| 1.0⠠⠊ ⡠⠊⢀⠔⠁ ⢀⠔⠊⠁ ⣀⠤⠒⠉ ⢀⣀⣀⠤⠤⠔⠒⠒⠒⠒⠒⠒⠒⠤⠤⢄⣀⡀ ⠈⠑⠒⠤⣀ ⠉⠢⢄ ⠈⠒⢄ ⠉⠢⡀⠑⢄ ⠑⠄ |
| | \⢠⠊ ⡔⠁ ⡠⠊⠁ ⢀⠤⠊ ⢀⠤⠒⠉⠁ ⣀⣀⠤⠤⠤⠤⠤⣀⣀⣀⣀ ⠈⠑⠒⠤⣀ ⠉⠢⡀ ⠑⢄ ⠱⡀ ⠈⠢⡀⠱⡀ |
| | ⡰⠁⢠⠊ ⢠⠊ ⢀⠔⠁ ⣀⠤⠊⠁ ⢀⡠⠔⠒⠉⠉ ⢀⣀⣀⣀⣀ ⠉⠒⠢⠤⣀ ⠉⠢⡀ ⠈⠢⢄ ⠑⢄ ⠈ ⠑⡄⠈⢆ |
| | ⠐⠁⢠⠃ ⡔⠁ ⢀⠔⠁ ⡠⠊ ⢀⠔⠊⠁ > ⠤⠒⠉⠉⠉⠁ ⠉⠉⠒⠢⠤⣀ ⠑⠢⡀ ⠈⠒⢄ ⠁ ⠈⢆ ⠘⡄⠈⠂ |
| 0.5 ⢠⠃ ⡄ ⢀⠎ ⢠⠊ ⢠⠊ ⡠⠒⠁ ⢀⡠⠔⠊⠉⠉⠉⠉⠉⠒⠒⠒⠤⡀ ⠑⠢ ⠈⠢⡀ ⠣⡀ ⡀ ⠈⢆ ⢆ ⠱⡀ |
| | ⡇ ⢰⠁ ⡜ ⢠⠃ ⢠⠃ ⡰⠁ ⢀⠔⠊⠁ ⣀⣀⣀⡀ ⠐⠤⡀ ⢠ ⠈⢆ ⠑⡄ ⠱⡀ ⠈⢆ ⠈⡆ ⢣ |
| | ⠸v ⡜ ⢠⠃ ⡜ ⡜ ⢠⠃v ⡔⠁ ⢠⠃ ⡔⠊⠉ ⠈⠉⠒⠤⡀ ⠱⡀ ⢇ ⠈⡆ ⠸⡀ ⢣ ⠘⡄ ⢱ ⠸⡀ |
| 0.0 ⡇ ⢸ ⡇ ⢰⠁ ⡜ ⢸ ⡇ ⡎ ⡠⠒⠉⠉⠑⢄ ⢱ ⢣ ⠘⡄ ⢸ ⡇ ⢸ ⡇ ⢸ ⠃ |
| | ⢠ ⡇ ⢸ ⡇ ⢸ ⡇ ⠘⡄ ⡇ ⢇ ⠑⢄⣀⣀⡠⠊ ⡸ ⡸ ⡇ ⡸ ⢠⠃ ⢸ ⡇ ⢸ |
| | ⠈⡆ ⢇ ⠸⡀ ⢣ ⠈⢆ ⠸⡀ ⢱ ⠘⢄ ⠑⢄⣀⣀< ⣀⠤⠒⠁ ⡰⠁ ⢀⠜ ⢠⠃ ⢸ ⡜ ⢀⠇ ⡜ ⡆ |
| -0.5⢣ ⠸⡀ ⢣ ⠈⢆ ⠈⢆ ⠑⡄ ⠃ ⠑⢄ ⠉⠉⠉ ⢀⡠⠊ ⡠⠃ ⢠⠃ ⢠⠃ ⡜ ⢀⠇ ⢸ |
| | ⠈⢆ ⠱ ⢣ ⠈⢆ ⠈⢢ ⠈⢆ ⠉⠒⠤⠤⣀⣀⣀⣀⣀⠤⠤⠒⠊⠁ ⢀⠔⠁ ⡠⠃ ⡠⠃ ⠘ ⠘ ⢠⠃ |
| | ⠘⡄ ⠣⡀ ⠈⠢⡀ ⠑⢄ ⠉⠢⢄⡀ ⠤⣀⣀ ⢀⣀⣀⣀⠤⠒< ⣀⠤⠒⠁ ⡠⠊ ⢀⠔⠁ ⡀ ⢠⠃⢀⠄ |
| | ⠘⢄ ⠑⢄ ⠈⢆ ⠑⠢⣀ ⣀⡀ ⠉⠉⠉⠉⠁ ⢀⣀⡠⠤⠒⠉ ⣀⠤⠒⠉ ⢀⠔⠁ ⡠⠂ ⢀⠜ ⡠⠃⢀⠎ |
| -1.0⢀ ⠈⠢⡀ ⠈⠢⣀ ⠑⠢⣀ ⠉⠒⠤⢄⡀ ⠈⠉⠑⠒⠒⠒⠒⠊⠉⠁ ⣀⠤⠒⠉ ⡠⠒⠁ ⡠⠊\ ⡰⠁ ⢀⠜ ⡠⠃ |
| | ⠑⢄ ⠈⠢⣀ ⠠⡀ ⠑⠢⢄ ⠉⠒⠤⡀ ⠈⠉⠒⠂ ⠤⠤⠤⠤⠤⠤⠤⠒⠒⠉⠉ ⣀⠤⠒⠉ ⡠⠔⠊ ⢀⠔⠊ ⢀⠔⠁⡠⠊ ⡠⠂ |
| | ⠑⢄ ⠑⠤⡀⠈⠢⣀ ⠑⠢⢄⡀ ⠠⠤⣀⣀⡀ ⣀⣀⡠⠤⠔⠊⠉ ⠠⠒⠉ ⠠⠊⠁ ⡠⠒⠁⡠⠊ ⡠⠊ |
| -1.5⠈⠢⢄ ⠉⠒⢄ ⠈ ⠉⠒⠤⢄⡀⠈⠁ < ⢀⡀ ⠈⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉ ⣀ ⢀⡠⠔⠉ ⢀⡠⠊ |
| | ⡀⠑⢄ ⠉⠢⣀ ⠠⢄⡀ ⠈⠑⠢⠄ ⠈⠉⠑⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠊⢉⣀⣀⠤⠔⠒⠉ ⣀⡠⠔⠊⢁⡀ ⢀⡠⠔⠁ ⢀\ |
| | ⠈⠒⢄⠑⠢⢄⡀ ⠉⠢⢄⡀⠈⠑⠢⢄⣀⡀ ⠒⠢⠤⠤⢄⣀⣀⣒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠊⠉⠉⠁ ⣀⡠⠤⠒⠊⠉⣀⡠⠔⠊⠁⢀⡠⠔⠊⠁ ⡠⠒⠁ |
| | ⠉⠒⠄⠈⠑⠢ ⠈⠉⠒⠢⠄ ⠈⠉⠉⠒⠒⠤ ⠉⠉⠉⠉⠉ ⠠⠤⠔⠒⠒⠒⠒⠒⠊⠉ ⠠⠔⠒⠊⠉ ⠔⠊⠁ ⠠⠒⠉ |
| +--+-------+--------+--------+--------+--------+--------+--------+-------+---- |
| -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 |
+--------------------------------------------------------------------------------+
X
Y

ASCII output:
Streamline Plot Demo - Circular Flow
+--------------------------------------------------------------------------------+
| 2.0 |
| | |
| | ⢀⡠⠔ ⣀⠤⠔⠂ ⢀⣀⣀⠤⠤⠤⠒⠒⠒⠒⠒⠂ ⠐⠒⠢⠤⠤⠤⣀⣀⣀ ⠠⢄⣀ ⠤⣀ |
| | ⢀⡠⠊⠁ ⣀⠤⠒⠉ ⣀⠤⠤⠒⠒⠉⠁ ⣀⣀⣀⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⢄⣀ ⠉⠉⠒⠢⠤⣀⡀ ⠉⠒⠤⡀ ⠉⠢⣀ |
| 1.5 ⣀⠔⠁ ⣀⠔⠉ ⢀⡠⠔⠒⠉ ⠉⠉ ⠈⠉⠒⠤⡀ ⠈⠑⠢⡀ ⠑⢄ |
| | ⠊ ⡠⠊ ⢀⠔⠊⠁ ⢀⣀⣀⠤⠤⠔⠒⠒⠒⠒⠒⠒⠒⠒⠤⠤⠤⣀⣀⡀ ⠈⠑⠢⣀ ⠈⠑⢄ ⠑⠄ |
| | ⡠⠊ ⡠⠊⠁ ⢀⣀⠤⠒⠊⠁⢀⣀⣀⡠⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⣀⣀⡀ ⠈⠉⠑⠢⢄⡀ ⠑⢄ ⠉⠢⡀ |
| 1.0 ⡠⠊ ⢀⠔⠉ ⣀⠔⠊⠁ ⠉⠁ ⢀⣀⣀⣀⣀⡀ ⠈⠉ ⠈⠑⠢⢄⡀ ⠑⢄ ⠈⠢⡀ |
| | ⠊ ⢀⠔⠁ ⢀⠤⠊ ⣀⠤⠒⠒⠉⠉⠉⠉⠁ ⠈⠉⠉⠒⠢⢄⣀⡀ ⠈⠑⢄ ⠑⡄ ⠑⠄ |
| | ⢀⠎ ⡠⠒⠁ ⣀⠤⠒⠉ ⡀ ⠈⠑⠢⡀ ⠑⡄ ⠈⢢ |
| | ⢀⠎ ⢠⠊ ⢀⡠⠊ ⣀⠤⠒⠉⣀⡠⠤⠔⠒⠒⠒⠒⠒⠒⠒⠢⠤⣀⡀ ⠈⠑⢄ ⠈⠢⡀ ⠱⡀ |
| 0.5 ⡎ ⡀ ⢠⠃ ⢀⠄ ⡰⠁ ⢀⠔⠉ ⡠⠔⠉ ⢀⡠⠤⠤⠤⠒⠢⠤⠤⠤⣀ ⠈⠑⢄ ⠑⢄ ⠠⡀ ⠘⡄ ⢠ ⢱ |
| | ⡜ ⡜ ⢀⠇ ⡎ ⡰⠁ ⡠⠊ ⡠⠊⠁ ⢀⣀⣀⣀⣀⡀ ⠉⠒⢄ ⠉⢢ ⢣ ⢱ ⠸⡀ ⠈⡆ ⢣ |
| | ⢰⠁ ⡇ ⡸ ⢸ ⢰⠁ ⡜ ⢠⠊ ⢀⠔⠊⠁ ⠈⠉⠢⡀ ⠱⡀ ⢣ ⠈⡆ ⡇ ⢇ ⢱ ⠈⡆ |
| 0.0 ⢠⠃ ⡇ ⡇ ⡇ ⢸ ⡎ ⢠⠃ ⠘⡄ ⢱ ⠈⡆ ⢸ ⢸ ⢸ ⠈⡆ ⡇ |
| | ⢸ ⠸⡀ ⡇ ⢇ ⢇ ⢸ ⡇ ⠈⢆ ⠁ ⢠⠃ ⢸ ⢠⠃ ⡸ ⢸ ⢸ ⢠⠃ ⠁ |
| | ⠸⡀ ⢇ ⠃ ⠸⡀ ⠸⡀ ⠠⡀ ⠘⢄ ⠈⠢⣀ ⣀⠤⠃ ⢠⠃ ⡎ ⢀⠇ ⢀⠇ ⢸ ⢸ ⢀⠇ |
| -0.5⢣ ⠸⡀ ⢣ ⠱⡀ ⠑⡄ ⠑⠤⣀ ⠉⠉⠉⠉⠉ ⣀⠤⠒⠁ ⡠⠜ ⡜ ⡸ ⢀⠇ ⡜ ⡜ |
| | ⢇ ⠃ ⠈⢆ ⢣ ⠘⡄ ⠈⠢⣀ ⠉⠑⠂⠒⠤⠔⠒⠒⠒⠉ ⢀⣀⠤⠊ ⣀⠔⠁ ⡠⠊ ⠁ ⢠⠊ ⠈ ⡸ |
| | ⠈⢆ ⠈⢢ ⠑⢄ ⢄ ⠑⠢⢄⡀ ⠠⠤⠤⠤⠤⠤⠤⠔⠊⠁⣀⠤⠒⠉ ⢀⠤⠒⠁ ⡰⠁ ⡰⠁ |
| | ⠢⡀ ⠣⡀ ⠑⢄ ⠑⢄ ⠉⠢⢄⡀ ⠈⠉⠒⠂ ⠈ ⢀⡠⠔⠁ ⡠⠊ ⡰⠁ |
| -1.0 ⠑⢄ ⠘⢄ ⠱⡀ ⠉⠢⢄⣀ ⠈⠑⠒⠤⠤⢄⣀⣀ ⣀⣀⣀⣀⠤⠒⠒⠉⠁ ⣀⠔⠉ ⢀⠔⠁ ⡠ |
| | ⠑⢄ ⠑⢄ ⠈⠒⢄⡀ ⠉⠒⠢⢄⣀⡀ ⠉⠉⠉⠉⠉ ⢀⣀ ⣀⠤⠊ ⣀⠔⠁ ⡠⠊ |
| | ⠑⢄ ⠑⢄ ⠑⢄ ⠈⠑⠢⢄⣀ ⠈⠉⠉⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠊⠉⠉⠁⣀⣀⠤⠤⠒⠉ ⢀⡠⠊ ⡠⠊ |
| -1.5⢄ ⠑⢄ ⠑⠤⣀⠉⠢⢄⡀ ⠉⠒⠢⠤⣀⣀ ⠐⠒⠤⠤⠤⠤⠤⠔⠒⠒⠒⠒⠊⠉ ⢀⡠⠔⠁ ⡠⠊ ⡠ |
| | ⠉⠢⡀⠑⠢⢄ ⠑⠢⢄⠈ ⠉⠁ ⣀⣀ ⣀⠤⠔⠊⠁ ⣀⠔⠉ ⢀⠔⠉ |
| | ⠈⠑⢄⡀⠉⠢⢄ ⠉⠒⠤⢄⣀ ⠤⣀⡀ ⠉⠑⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠉⠉⠉ ⢀⣀⠤⠤⠒⠒⠉ ⣀⠤⠒⠉ ⢀⡠⠊⠁ |
| | ⠈⠑⠢ ⠉⠒⠤ ⠉⠑⠒⠤ ⠈⠉⠑⠒⠒⠒⠤⠤ ⠤⠤⠤⠤⠤⠒⠒⠒⠉⠉⠁ ⠠⠔⠒⠉ ⠔⠊⠁ |
| +--+-------+--------+--------+--------+--------+--------+--------+-------+---- |
| -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 |
+--------------------------------------------------------------------------------+
X
Y