Pythagoras tree: Difference between revisions

 

void main() {

final groups = Iterable.generate(12, (lvl) {

final (a, b) = pp;

final v = (x: b.x - a.x, y: b.y - a.y);

final [c, d, w] = [a, b, v].map((p) => (x: p.x + v.y, y: p.y - v.x)).toList();

final e = (x: c.x + w.x / 2, y: c.y + w.y / 2);

return '<polygon points="${[a, c, e, d, c, d, b].expand((p) => [p.x, p.y]).join(' ')}"/>';

}).join('\n');

return '<g fill="#${rg(20)}${rg(30)}18">\n$lvlPolygons\n</g>';

}).join('\n');

final attrs = 'viewBox="$x $y ${-x - x} ${-y}" stroke="white" xmlns="http://www.w3.org/2000/svg"';

File('Pythagor_tree.svg').writeAsString('<svg $attrs>\n$groups\n</svg>');

 

final fill = Paint()..style = PaintingStyle.fill;

for (var lvl = 0; lvl < 12; lvl++) {

final path = Path();

final v = Offset(b.dx - a.dx, b.dy - a.dy);

final [c, d, w] = [a, b, v].map((p) => Offset(p.dx + v.dy, p.dy - v.dx)).toList();

final e = Offset(c.dx + w.dx / 2, c.dy + w.dy / 2);

path.addPolygon([a, c, e, d, c, d, b], true);

}