Path - Fill
AGG does most of its operations based on paths. A path object needs to have the following two functions implemented.
void rewind (int path = 0);
unsigned vertex(double* x, double* y);
See SimplePath for an example.
Additionally, two objects are needed. These two objects can be re-used.
- agg::rasterizer_scanline_aa is used to store the paths passed in.
- agg::scanline_p8 is used to store intermediate calculation results.
Finally, agg::render_scanlines_aa_solid is used to render the paths using scanline algorithm.
agg::scanline_p8 scanline;
ras.reset();
ras.add_path(path);
agg::render_scanlines_aa_solid(ras, scanline, rBase, greenColor);
The above for anti-aliased drawing. If you want to use non-anti-aliased drawing, use the following instead.
- Class agg::scanline_bin
- Function agg::render_scanlines_bin_solid
Example
tutorial_path_1.cpp generates an image containing a green square and a red star.
An equivalent SVG is
