agg/examples/component_rendering.cpp

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2021-12-27 20:14:31 +01:00
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_p.h"
#include "agg_renderer_scanline.h"
#include "agg_ellipse.h"
#include "agg_pixfmt_gray.h"
#include "agg_pixfmt_rgb.h"
#include "ctrl/agg_slider_ctrl.h"
#include "platform/agg_platform_support.h"
#define AGG_BGR24
//#define AGG_BGR48
//#define AGG_BGR96
#include "pixel_formats.h"
typedef agg::blender_gray<gray_type> gray_blender;
enum flip_y_e { flip_y = true };
class the_application : public agg::platform_support
{
agg::slider_ctrl<color_type> m_alpha;
public:
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_alpha(5, 5, 320-5, 10+5, !flip_y)
{
m_alpha.label("Alpha=%1.0f");
m_alpha.range(0, 255);
m_alpha.value(255);
add_ctrl(m_alpha);
}
virtual void on_draw()
{
pixfmt pf(rbuf_window());
typedef agg::pixfmt_alpha_blend_gray<gray_blender, agg::rendering_buffer, 3, 2> pixfmt_r;
typedef agg::pixfmt_alpha_blend_gray<gray_blender, agg::rendering_buffer, 3, 1> pixfmt_g;
typedef agg::pixfmt_alpha_blend_gray<gray_blender, agg::rendering_buffer, 3, 0> pixfmt_b;
pixfmt_r pfr(rbuf_window());
pixfmt_g pfg(rbuf_window());
pixfmt_b pfb(rbuf_window());
agg::renderer_base<pixfmt> rbase(pf);
agg::renderer_base<pixfmt_r> rbr(pfr);
agg::renderer_base<pixfmt_g> rbg(pfg);
agg::renderer_base<pixfmt_b> rbb(pfb);
agg::rasterizer_scanline_aa<> ras;
agg::scanline_p8 sl;
rbase.clear(agg::rgba(1,1,1));
agg::ellipse er(width() / 2 - 0.87*50, height() / 2 - 0.5*50, 100, 100, 100);
ras.add_path(er);
agg::render_scanlines_aa_solid(ras, sl, rbr,
gray_type(0, unsigned(m_alpha.value())));
agg::ellipse eg(width() / 2 + 0.87*50, height() / 2 - 0.5*50, 100, 100, 100);
ras.add_path(eg);
agg::render_scanlines_aa_solid(ras, sl, rbg,
gray_type(0, unsigned(m_alpha.value())));
agg::ellipse eb(width() / 2, height() / 2 + 50, 100, 100, 100);
ras.add_path(eb);
agg::render_scanlines_aa_solid(ras, sl, rbb,
gray_type(0, unsigned(m_alpha.value())));
agg::render_ctrl(ras, sl, rbase, m_alpha);
}
};
int agg_main(int argc, char* argv[])
{
the_application app(pix_format, flip_y);
app.caption("AGG Example. Component Rendering");
if(app.init(320, 320, 0))
{
return app.run();
}
return 1;
}