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/* |
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* l-system interpreters |
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*/ |
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|
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#include "config.h" |
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|
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#include "lsys.h" |
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#include "interp.h" |
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#include "interface.h" |
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#include "attr.h" |
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|
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#include <cstdlib> |
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#include <cmath> |
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#include <iostream> |
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|
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#ifndef M_PI |
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# define M_PI 3.14159265358979323846 /* pi */ |
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#endif |
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|
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bool interpreter::execute_child (const module &m, const lsys &l) t_err |
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{ |
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hash_map<string, lsys *>::const_iterator i; |
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const lsys *sys = &l; |
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|
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do { |
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if ((i = sys->sub_lsys.find (m.str)) != sys->sub_lsys.end ()) |
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{ |
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module_vec v = m.wrap (); |
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|
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if (i->second->eval (v)) |
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{ |
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execute (v, *i->second); |
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return true; |
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} |
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|
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break; |
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} |
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|
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sys = sys->parent; |
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} while (sys); |
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|
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return false; |
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} |
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|
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void simple_interpreter::execute(const module_vec &v, const lsys &l) t_err |
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{ |
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depth--; |
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|
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string s; |
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module m; |
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|
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for (module_pos i = v.begin (); i != v.end(); ++i) |
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if (!depth || !execute_child (*i, l)) |
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cout << *i << " "; |
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|
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depth++; |
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} |
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|
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void simple_interpreter::operator ()(const module_vec &v, const lsys &l) t_err |
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{ |
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if (maxdepth > 0) |
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{ |
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depth = maxdepth + 1; |
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execute (v, l); |
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cout << endl; |
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} |
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} |
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|
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#define MK(m) point((m), cur.pos, cur.dir[2], cur.attr) |
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|
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turtle_interpreter::turtle_interpreter (gfx_int &interface, bool flat_world) t_no |
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: iface (interface), flat(flat_world) |
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{ |
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} |
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|
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void turtle_interpreter::rotate_tl (double phi) t_no |
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{ |
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phi *= M_PI/180; |
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double s = sin (phi), |
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c = cos (phi); |
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cur.dir = mat ( vec ( c, s, 0), |
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vec (-s, c, 0), |
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vec ( 0, 0, 1)) * cur.dir; |
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} |
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|
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void turtle_interpreter::rotate_pd (double phi) t_no |
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{ |
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if (flat) return; |
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|
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phi *= M_PI/180; |
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double s = sin (phi), |
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c = cos (phi); |
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cur.dir = mat ( vec ( c, 0,-s), |
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vec ( 0, 1, 0), |
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vec ( s, 0, c)) * cur.dir; |
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} |
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|
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void turtle_interpreter::rotate_rl (double phi) t_no |
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{ |
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if (flat) return; |
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|
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phi *= M_PI/180; |
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double s = sin (phi), |
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c = cos (phi); |
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cur.dir = mat ( vec ( 1, 0, 0), |
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vec ( 0, c, s), |
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vec ( 0,-s, c)) * cur.dir; |
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} |
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|
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void turtle_interpreter::forward (double d) t_no |
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{ |
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cur.pos = cur.pos + d * cur.dir[0]; |
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} |
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|
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void turtle_interpreter::attrs_changed () t_err |
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{ |
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delta = cur.attr("delta", 45); |
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distance = cur.attr("distance", 10); |
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} |
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|
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void turtle_interpreter::execute (const module_vec &v, const lsys &l) t_err |
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{ |
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// cout << "interp " << v << endl; |
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string s; |
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double d; |
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module m; |
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const module_vec damnit; |
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|
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for (module_pos i = v.begin (); i != v.end (); ++i) |
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{ |
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// cout << delta << "|" << distance << "> " << cur.pos << " " << cur.dir << " " << i->str << endl; |
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if (i->is_func ("[")) |
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{ |
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state_stack.push (cur); |
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} |
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else if (i->is_func ("]")) |
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{ |
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cur = state_stack.top (), state_stack.pop (); |
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attrs_changed (); |
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} |
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else if (i->is_func ("attr", s, m)) |
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{ |
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if (m.is_expr) |
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m = module (eval_expr (m, cur.attr)); |
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|
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cur.attr[s] = m; |
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attrs_changed (); |
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} |
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else if (i->is_func ("+")) |
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rotate_tl (delta); |
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else if (i->is_func ("-")) |
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rotate_tl (-delta); |
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else if (i->is_func ("+", d)) |
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rotate_tl (d); |
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else if (i->is_func ("-", d)) |
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rotate_tl (-d); |
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else if (i->is_func ("&")) |
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rotate_pd (delta); |
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else if (i->is_func ("^")) |
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rotate_pd (-delta); |
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else if (i->is_func ("&", d)) |
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rotate_pd (d); |
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else if (i->is_func ("^", d)) |
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rotate_pd (-d); |
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else if (i->is_func ("\\")) |
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rotate_rl (delta); |
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else if (i->is_func ("/")) |
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rotate_rl (-delta); |
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else if (i->is_func ("\\", d)) |
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rotate_rl (d); |
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else if (i->is_func ("/", d)) |
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rotate_rl (-d); |
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else if (i->is_func ("|")) |
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rotate_tl (180); |
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else if (i->is_func ("f")) |
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forward (distance); |
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else if (i->is_func ("f", d)) |
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forward (d); |
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else if (i->is_func ("F")) |
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{ |
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if (obj_stack.empty ()) |
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{ |
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point o(MK(damnit)); forward (distance); iface.segment (o, MK(damnit)); |
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} |
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else |
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{ |
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forward (distance); cur_obj.push_back (MK(damnit)); |
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} |
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} |
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else if (i->is_func ("F", d)) |
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{ |
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if (obj_stack.empty ()) |
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{ |
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point o(MK(damnit)); forward (d); iface.segment (o, MK(damnit)); |
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} |
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else |
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{ |
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forward (d); cur_obj.push_back (MK(damnit)); |
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} |
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} |
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else if (i->is_func (".")) |
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cur_obj.push_back (MK(*i)); |
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else if (i->is_func ("{")) |
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{ |
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obj_stack.push (cur_obj); |
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cur_obj.erase (cur_obj.begin (), cur_obj.end ()); |
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} |
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else if (i->is_func ("}")) |
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{ |
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iface.object (cur_obj); |
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if (obj_stack.empty ()) |
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throw error ("polygon stack underflow", *i); |
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else |
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{ |
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cur_obj = obj_stack.top (); |
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obj_stack.pop (); |
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} |
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} |
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else |
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execute_child (*i, l); |
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} |
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} |
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|
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void turtle_interpreter::operator ()(const module_vec &v, const lsys &l) t_err |
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{ |
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cur.pos = vec(0, 0, 0); |
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cur.dir = mat (vec ( 0, 1, 0), |
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vec ( 1, 0, 0), |
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vec ( 0, 0, 1)); |
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|
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srand (1); // zero breaks certain libc versins |
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|
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cur.attr["delta"] = 45.0; |
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cur.attr["distance"] = 10.0; |
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attrs_changed (); |
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|
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iface.begin_fig (); |
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execute (v, l); |
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iface.end_fig (); |
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} |
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