AGG 第十九课 agg::bezier_arc

void DrawCurveOfBezierArc() { agg::rendering_buffer &rbuf = rbuf_window(); agg::pixfmt_bgr24 pixf(rbuf);
typedef agg::renderer_base<agg::pixfmt_bgr24> renderer_base_type; renderer_base_type renb(pixf);
typedef agg::renderer_scanline_aa_solid<renderer_base_type> renderder_scanline_type; renderder_scanline_type rensl(renb);
agg::rasterizer_scanline_aa<> ras; agg::scanline_u8 sl; ras.reset();
agg::bezier_arc a(100,100, 50,50, 0.0, agg::pi/2); agg::conv_curve<agg::bezier_arc> c(a); agg::conv_stroke<agg::conv_curve<agg::bezier_arc> > s(c);
agg::conv_stroke<agg::bezier_arc> stroke(a);
ras.add_path(s); //ras.add_path(stroke);//对比查看
agg::render_scanlines_aa_solid(ras,sl,renb,agg::rgba8(255,0,0)); }
补充：可识别VertexSource中的曲线信息 构造参数为VertexSource,conv_smooth_poly1_curve就是基于它实现的。例程里的顶点没有曲线的信息，在文字输出时会用到她的。