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#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_path_storage.h"
#include "agg_conv_transform.h"
#include "agg_bounding_rect.h"
#include "agg_renderer_scanline.h"
#include "agg_pixfmt_rgb.h"
#include "agg_pixfmt_gray.h"
#include "agg_alpha_mask_u8.h"
#include "agg_scanline_u.h"
#include "agg_scanline_p.h"
#include "agg_ellipse.h"
#include "platform/agg_platform_support.h"
enum flip_y_e { flip_y = true };
agg::path_storage g_path;
agg::rgba8 g_colors[100];
unsigned g_path_idx[100];
unsigned g_npaths = 0;
double g_x1 = 0;
double g_y1 = 0;
double g_x2 = 0;
double g_y2 = 0;
double g_base_dx = 0;
double g_base_dy = 0;
double g_angle = 0;
double g_scale = 1.0;
double g_skew_x = 0;
double g_skew_y = 0;
int g_nclick = 0;
unsigned parse_lion(agg::path_storage& ps, agg::rgba8* colors, unsigned* path_idx);
void parse_lion()
{
g_npaths = parse_lion(g_path, g_colors, g_path_idx);
agg::pod_array_adaptor<unsigned> path_idx(g_path_idx, 100);
agg::bounding_rect(g_path, path_idx, 0, g_npaths, &g_x1, &g_y1, &g_x2, &g_y2);
g_base_dx = (g_x2 - g_x1) / 2.0;
g_base_dy = (g_y2 - g_y1) / 2.0;
}
agg::rendering_buffer g_alpha_mask_rbuf;
agg::alpha_mask_gray8 g_alpha_mask(g_alpha_mask_rbuf);
agg::rasterizer_scanline_aa<> g_rasterizer;
class the_application : public agg::platform_support
{
unsigned char* m_alpha_buf;
agg::rendering_buffer m_alpha_rbuf;
public:
virtual ~the_application()
{
delete [] m_alpha_buf;
}
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_alpha_buf(0)
{
parse_lion();
}
void generate_alpha_mask(int cx, int cy)
{
delete [] m_alpha_buf;
m_alpha_buf = new unsigned char[cx * cy];
g_alpha_mask_rbuf.attach(m_alpha_buf, cx, cy, cx);
typedef agg::renderer_base<agg::pixfmt_gray8> ren_base;
typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
agg::pixfmt_gray8 pixf(g_alpha_mask_rbuf);
ren_base rb(pixf);
renderer r(rb);
agg::scanline_p8 sl;
rb.clear(agg::gray8(0));
agg::ellipse ell;
int i;
for(i = 0; i < 10; i++)
{
ell.init(rand() % cx,
rand() % cy,
rand() % 100 + 20,
rand() % 100 + 20,
100);
g_rasterizer.add_path(ell);
r.color(agg::gray8(rand() & 0xFF, rand() & 0xFF));
agg::render_scanlines(g_rasterizer, sl, r);
}
}
virtual void on_resize(int cx, int cy)
{
generate_alpha_mask(cx, cy);
}
virtual void on_draw()
{
int width = rbuf_window().width();
int height = rbuf_window().height();
typedef agg::scanline_u8_am<agg::alpha_mask_gray8> scanline_type;
typedef agg::renderer_base<agg::pixfmt_bgr24> ren_base;
typedef agg::renderer_scanline_aa_solid<ren_base> renderer;
agg::pixfmt_bgr24 pixf(rbuf_window());
ren_base rb(pixf);
renderer r(rb);
scanline_type sl(g_alpha_mask);
rb.clear(agg::rgba8(255, 255, 255));
agg::trans_affine mtx;
mtx *= agg::trans_affine_translation(-g_base_dx, -g_base_dy);
mtx *= agg::trans_affine_scaling(g_scale, g_scale);
mtx *= agg::trans_affine_rotation(g_angle + agg::pi);
mtx *= agg::trans_affine_skewing(g_skew_x/1000.0, g_skew_y/1000.0);
mtx *= agg::trans_affine_translation(width/2, height/2);
agg::conv_transform<agg::path_storage, agg::trans_affine> trans(g_path, mtx);
agg::render_all_paths(g_rasterizer, sl, r, trans, g_colors, g_path_idx, g_npaths);
}
void transform(double width, double height, double x, double y)
{
x -= width / 2;
y -= height / 2;
g_angle = atan2(y, x);
g_scale = sqrt(y * y + x * x) / 100.0;
}
virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
int width = rbuf_window().width();
int height = rbuf_window().height();
transform(width, height, x, y);
force_redraw();
}
if(flags & agg::mouse_right)
{
g_skew_x = x;
g_skew_y = y;
force_redraw();
}
}
virtual void on_mouse_move(int x, int y, unsigned flags)
{
on_mouse_button_down(x, y, flags);
}
};
int agg_main(int argc, char* argv[])
{
the_application app(agg::pix_format_bgr24, flip_y);
app.caption("AGG Example. Lion with Alpha-Masking");
if(app.init(512, 400, agg::window_resize))
{
return app.run();
}
return 1;
}
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