agg::trans_single_path计算路径长度

头文件：agg/include/agg_trans_single_path.h

源文件：agg/src/agg_trans_single_path.cpp

1 total_length统计路径长度

agg::path_storageps;

ps.move_to(100,20);

ps.line_to(10,200);

ps.line_to(200,200);

agg::trans_single_path tspath;

tspath.add_path(ps);

double nPathLen= tspath.total_length();

2 transform

暂时不清楚

agg::trans_single_path tcurve;

tcurve.add_path(m_path_storage);

double len = tcurve.total_length();

int n = 3;

double x = len / n;

couble y = 0;

tcurve.transform(&x, &y);

here x, y been transformed to the rightvalue.

总结：使用该类根据路径线段的方向来渲染文字，目前暂时不了解：

http://sourceforge.net/p/vector-agg/mailman/message/9964153/