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Justin Lin
2020-04-14 13:35:27 +08:00
parent 074d526d10
commit 4dc3edf7e2
2 changed files with 11 additions and 11 deletions
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18
src/experimental/_impl/_lsystem2_impl.scad
View File

@@ -10,23 +10,23 @@ function _join(strs) =
let(leng = len(strs)) let(leng = len(strs))
[for(i = 0, s = strs[0]; i < leng; i = i + 1, s = str(s, strs[i])) s][leng - 1]; [for(i = 0, s = strs[0]; i < leng; i = i + 1, s = str(s, strs[i])) s][leng - 1];
function c_or_v(c, v, rand_n, rule, derived_pr, leng, i = 0) = function c_or_v(c, v, rand_n, rule, rule_pr, leng, i = 0) =
i == leng ? c : ( i == leng ? c : (
let(idx = search([v[i]], rule, num_returns_per_match=0, index_col_num = 1)[0][0]) let(idx = search([v[i]], rule, num_returns_per_match=0, index_col_num = 1)[0][0])
rand_n < derived_pr[idx - 1] ? v[i] : c_or_v(c, v, rand_n, rule, derived_pr, leng, i + 1) rand_n < rule_pr[idx - 1] ? v[i] : c_or_v(c, v, rand_n, rule, rule_pr, leng, i + 1)
); );
function _derive1_p(base, rule, derived_pr) = function _derive1_p(base, rule, rule_pr) =
let(rand_n = rands(0, 1, 1)[0]) let(rand_n = rands(0, 1, 1)[0])
_join([ _join([
for(c = base) for(c = base)
let(v = [for(r = rule) if(r[0] == c) r[1]]) let(v = [for(r = rule) if(r[0] == c) r[1]])
v == [] ? c : v == [] ? c :
c_or_v(c, v, rand_n, rule, derived_pr, len(v)) c_or_v(c, v, rand_n, rule, rule_pr, len(v))
]); ]);
function _derive_p(base, rule, derived_pr, n, i = 0) = function _derive_p(base, rule, rule_pr, n, i = 0) =
i == n ? base : _derive_p(_derive1_p(base, rule, derived_pr), rule, derived_pr, n, i + 1); i == n ? base : _derive_p(_derive1_p(base, rule, rule_pr), rule, rule_pr, n, i + 1);
function _derive1(base, rule) = _join([ function _derive1(base, rule) = _join([
for(c = base) for(c = base)
@@ -37,10 +37,10 @@ function _derive1(base, rule) = _join([
function _derive(base, rule, n, i = 0) = function _derive(base, rule, n, i = 0) =
i == n ? base : _derive(_derive1(base, rule), rule, n, i + 1); i == n ? base : _derive(_derive1(base, rule), rule, n, i + 1);
function _lsystem2_derive(rule, n, derived_pr) = function _lsystem2_derive(rule, n, rule_pr) =
let(base = assoc_lookup(rule, "S")) let(base = assoc_lookup(rule, "S"))
is_undef(derived_pr) ? _derive(base, rule, n) : is_undef(rule_pr) ? _derive(base, rule, n) :
_derive_p(base, rule, derived_pr, n); _derive_p(base, rule, rule_pr, n);
function _next_stack(t, code, stack) = function _next_stack(t, code, stack) =
code == "[" ? concat([t], stack) : code == "[" ? concat([t], stack) :

4
src/experimental/lsystem2.scad
View File

@@ -1,9 +1,9 @@
use <experimental/_impl/_lsystem2_impl.scad>; use <experimental/_impl/_lsystem2_impl.scad>;
use <turtle/turtle2d.scad>; use <turtle/turtle2d.scad>;
function lsystem2(rule, n, angle, leng = 1, heading = 0, start = [0, 0], forward_chars = "F", derived_pr) = function lsystem2(rule, n, angle, leng = 1, heading = 0, start = [0, 0], forward_chars = "F", rule_pr) =
let( let(
derived = _lsystem2_derive(rule, n, derived_pr), derived = _lsystem2_derive(rule, n, rule_pr),
codes = forward_chars == "F" ? derived : _join([ codes = forward_chars == "F" ? derived : _join([
for(c = derived) for(c = derived)
let(idx = search(c, forward_chars)) let(idx = search(c, forward_chars))