How to plot using polar coordinates

[ahaoboy]

r=5*\cos(\theta)-\cos(5*\theta)

termplot "5*cos(x)-cos(5*x) for x in 0:6.28"

Polar coordinates are sometimes more concise

[ekinimo]

I'd have to extend the command parser and introduce mode. Codebase is a mess but if you wanna give it a go, go ahead. I'll look into it but it might take a while

until then as a workaround, you can use "radius(x)=5*cos(x)-cos(5*x);(radius(x)*cos(x),radius(x)*sin(x)) for x in 0:6.28"

❯ cargo run -- "radius(x)=5*cos(x)-cos(5*x); (radius(x)*cos(x),radius(x)*sin(x)) for x in 0:6.28 svg=todo.svg"
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.01s
     Running `target/debug/termplot 'radius(x)=5*cos(x)-cos(5*x); (radius(x)*cos(x),radius(x)*sin(x)) for x in 0:6.28 svg=todo.svg'`
┌─ ASCII Parametric Plot: 1002 points, X:[0.00, 4.63], Y:[-3.07, 3.07] ─┐
│ 3.7       |                                                                    │
│           |                                          *********                 │
│           |                             *************        ********          │
│           |                      ********                           ****       │
│           |                 ******                                     *       │
│ 1.8       |            ******                                          *       │
│           |         ****                                              **       │
│           |      ****                                               ***        │
│           |   ***                                                 ***          │
│           | ***                                                 ***            │
│           ***                                                  **              │
│ 0.0 ------*----------------------------------------------------*---------------│
│           ***                                                  **              │
│           | ***                                                 ***            │
│           |   ***                                                 ***          │
│           |      ***                                                ***        │
│           |         ****                                              **       │
│-1.8       |             *****                                          *       │
│           |                 ******                                     *       │
│           |                       *******                            ***       │
│           |                             *************        ********          │
│           |                                          ********                  │
│           |                                                                    │
│-3.7       |                                                                    │
└─────────────────────────────────────────────────────────────────────────────────┘
X:   0.0              1.2              2.3              3.5              4.6

[ekinimo]

We probably should handle coordinate transformations generically with few predefined coordinate transformations (polar/log/loglog/cylindrical/spherical). To extend it fully to 3d plots, we would need to introduce parametric 3d plots