AGG第二十七课agg::conv_clip_polyline裁剪线区域
应用场景
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头文件
#include"agg/include/agg_conv_clip_polyline.h"
简单例子
void ClipPathByPolyline()
{
agg::rendering_buffer &rbuf = rbuf_window();
agg::pixfmt_bgr24 pixf(rbuf);
typedef agg::renderer_base
renderer_base_type renb(pixf);
typedef agg::renderer_scanline_aa_solid
renderder_scanline_type rensl(renb);
agg::rasterizer_scanline_aa<> ras;
agg::scanline_u8 sl;
ras.reset();
agg::path_storage ps;
ps.move_to(100,540);
ps.line_to(168.889,471.429);
ps.line_to(237.778,402.857);
ps.line_to(306.667,334.286);
ps.line_to(651.111,-8.57143);
ps.line_to(720,-6.85714e+19);
ps.line_to(200,400);
ps.line_to(400,400);
ps.line_to(200,500);
ps.line_to(700,400);
agg::conv_clip_polyline
polyline.clip_box(0,0,600,800);
agg::conv_dash
dash.add_dash(10,10);
agg::conv_stroke
stroke.width(2);
ras.add_path(stroke);
agg::render_scanlines_aa_solid(ras,sl,renb,agg::rgba8(255,0,0));
}
限制:
Here the lines will be clipped beforecalculating the rest. But if you have
very wide lines you will see some defects
To avoid it you may want to extend theclipping area to the maximal line width.
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