Lesson 38 of AGG some uncommonly used coordinate conversion pipes

5 agg::conv_smooth_poly1_curve

Vertices of smooth transition polygons (Bessel)

Header file: # include "agg/include/agg_conv_smooth_poly1.h"

Basic definition:

Template

Struct conv_smooth_poly1_curve:

Publicconv_curve

The construction parameter is the VertexSource,smooth_value attribute that determines the smoothness (default is 1)

Simple application examples:

Agg::path_storage ps

Ps.move_to (100200)

Ps.line_to (300500)

Ps.line_to (400400)

Ps.close_polygon (true)

Agg::conv_smooth_poly1_curve cspc (ps)

Ras.add_path (cspc)

6 agg::conv_bspline

Vertices of the smooth transition Polyline (Bessel)

Here you need to declare the concept of polylines:

It is commonly referred to as a Polyline, which is just a combination of segments. For example, if a Z-shaped line is drawn with a line segment, then there are three line segments. In fact, a polygon is a kind of polysemous line, a kind of polysemous line.

Header file: # include "agg/include/agg_conv_bspline.h"

Basic definition:

Template

Structconv_bspline: public conv_adaptor_vcgen

Constructor determines the step size for the VertexSource,interpolation_step attribute

Example:

Agg::path_storage ps

Ps.move_to (100200)

Ps.line_to (300500)

Ps.line_to (400400)

/ / ps.close_polygon (true); / / A very strange pattern

Agg::conv_strokestroke (ps)

Agg::conv_bsplinecbsp (stroke)

Ras.add_path (cbsp)

6 agg::conv_marker Establishment Marker

Detailed reference arrow

7 agg::conv_curve

It is based on the recognizable VertexSource that the construction parameter of curve information is VertexSource,conv_smooth_poly1_curve. The vertex in the routine has no curve information, so she will be used in the text output.