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Showing content from https://github.com/alandefreitas/matplotplusplus/commit/e17c93419529c8a17e7fb07c12c3cf779f2189ec below:

Fix quiver scaling to respect user input (#280) · alandefreitas/matplotplusplus@e17c934 · GitHub

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examples/vector_fields/quiver3

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+22

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lines changed Original file line number Diff line number Diff line change


 @@ -16,7 +16,7 @@ int main() {

16 16


 auto V = get_v();

17 17


 auto W = get_w();

18 18 19

-
 quiver3(Z, U, V, W);

19

+
 quiver3(Z, U, V, W, 5);

20 20


 view(-35, 45);

21 21 22 22


 show();

Original file line number Diff line number Diff line change


 @@ -4551,15 +4551,23 @@ namespace matplot {

4551 4551


 double v_max = *std::max_element(v.begin(), v.end());

4552 4552


 double y_max = ydiffmin != y_diff.end() ? *ydiffmin : v_max;

4553 4553 4554

+
 // scale u, v with same ratio to retain direction

4555

+
 double mag_max = 1;

4556

+
 for (size_t i = 0; i < u.size(); ++i) {

4557

+
 double mag = sqrt(u[i] * u[i] + v[i] * v[i]);

4558

+
 mag_max = mag > mag_max ? mag : mag_max;

4559

+
 }

4560

+
 double val_max = std::min(x_max, y_max);

4561 + 4554 4562


 auto u_scaled =

4555 4563


 (scale != 0.)

4556 4564


 ? transform(

4557

-
 u, [&](double u) { return (u / u_max) * scale * x_max; })

4565

+
 u, [&](double u) { return (u / mag_max) * scale * val_max; })

4558 4566


 : u;

4559 4567


 auto v_scaled =

4560 4568


 (scale != 0.)

4561 4569


 ? transform(

4562

-
 v, [&](double v) { return (v / v_max) * scale * y_max; })

4570

+
 v, [&](double v) { return (v / mag_max) * scale * val_max; })

4563 4571


 : v;

4564 4572 4565 4573


 vectors_handle l = std::make_shared<class vectors>(


 @@ -4640,20 +4648,28 @@ namespace matplot {

4640 4648


 double w_max = *std::max_element(w.begin(), w.end());

4641 4649


 double z_max = zdiffmin != z_diff.end() ? *zdiffmin : w_max;

4642 4650 4651

+
 // scale u, v, w with same ratio to retain direction

4652

+
 double mag_max = 1;

4653

+
 for (size_t i = 0; i < u.size(); ++i) {

4654

+
 double mag = sqrt(u[i] * u[i] + v[i] * v[i] + w[i] * w[i]);

4655

+
 mag_max = mag > mag_max ? mag : mag_max;

4656

+
 }

4657

+
 double val_max = std::min(std::min(x_max, y_max), z_max);

4658 + 4643 4659


 auto u_scaled =

4644 4660


 (scale != 0.)

4645 4661


 ? transform(

4646

-
 u, [&](double u) { return (u / u_max) * scale * x_max; })

4662

+
 u, [&](double u) { return (u / mag_max) * scale * val_max; })

4647 4663


 : u;

4648 4664


 auto v_scaled =

4649 4665


 (scale != 0.)

4650 4666


 ? transform(

4651

-
 v, [&](double v) { return (v / v_max) * scale * y_max; })

4667

+
 v, [&](double v) { return (v / mag_max) * scale * val_max; })

4652 4668


 : v;

4653 4669


 auto w_scaled =

4654 4670


 (scale != 0.)

4655 4671


 ? transform(

4656

-
 w, [&](double w) { return (w / w_max) * scale * z_max; })

4672

+
 w, [&](double w) { return (w / mag_max) * scale * val_max; })

4657 4673


 : w;

4658 4674 4659 4675


 vectors_handle l = std::make_shared<class vectors>(

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