agg::trans_single_path计算路径长度

Posted 2020-06-09

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/