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multi_clip.cpp
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multi_clip.cpp
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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_scanline_u.h"
#include "agg_color_gray.h"
#include "agg_renderer_mclip.h"
#include "agg_renderer_scanline.h"
#include "agg_path_storage.h"
#include "agg_conv_transform.h"
#include "agg_bounding_rect.h"
#include "agg_renderer_outline_aa.h"
#include "agg_renderer_primitives.h"
#include "agg_renderer_markers.h"
#include "agg_span_allocator.h"
#include "agg_span_gradient.h"
#include "agg_span_interpolator_linear.h"
#include "agg_rasterizer_outline_aa.h"
#include "agg_ellipse.h"
#include "ctrl/agg_slider_ctrl.h"
#include "platform/agg_platform_support.h"
//#define AGG_GRAY8
#define AGG_BGR24
//#define AGG_RGB24
//#define AGG_BGRA32
//#define AGG_RGBA32
//#define AGG_ARGB32
//#define AGG_ABGR32
//#define AGG_RGB565
//#define AGG_RGB555
#include "pixel_formats.h"
enum flip_y_e { flip_y = true };
agg::rasterizer_scanline_aa<> g_rasterizer;
agg::scanline_u8 g_scanline;
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;
}
namespace agg
{
// Specializations of the gradient_linear_color for rgba8 and gray8
// color types. Only for the sake of performance.
//========================================================================
template<> struct gradient_linear_color<rgba8>
{
typedef rgba8 color_type;
gradient_linear_color() {}
gradient_linear_color(const color_type& c1, const color_type& c2) :
m_c1(c1), m_c2(c2) {}
static unsigned size() { return 256; }
color_type operator [] (unsigned v) const
{
color_type c;
c.r = (int8u)((((m_c2.r - m_c1.r) * int(v)) + (m_c1.r << 8)) >> 8);
c.g = (int8u)((((m_c2.g - m_c1.g) * int(v)) + (m_c1.g << 8)) >> 8);
c.b = (int8u)((((m_c2.b - m_c1.b) * int(v)) + (m_c1.b << 8)) >> 8);
c.a = (int8u)((((m_c2.a - m_c1.a) * int(v)) + (m_c1.a << 8)) >> 8);
return c;
}
void colors(const color_type& c1, const color_type& c2)
{
m_c1 = c1;
m_c2 = c2;
}
color_type m_c1;
color_type m_c2;
};
//========================================================================
template<> struct gradient_linear_color<gray8>
{
typedef gray8 color_type;
gradient_linear_color() {}
gradient_linear_color(const color_type& c1, const color_type& c2) :
m_c1(c1), m_c2(c2) {}
static unsigned size() { return 256; }
color_type operator [] (unsigned v) const
{
color_type c;
c.v = (int8u)((((m_c2.v - m_c1.v) * int(v)) + (m_c1.v << 8)) >> 8);
c.a = (int8u)((((m_c2.a - m_c1.a) * int(v)) + (m_c1.a << 8)) >> 8);
return c;
}
void colors(const color_type& c1, const color_type& c2)
{
m_c1 = c1;
m_c2 = c2;
}
color_type m_c1;
color_type m_c2;
};
}
class the_application : public agg::platform_support
{
agg::slider_ctrl<agg::rgba8> m_num_cb;
public:
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_num_cb(5, 5, 150, 12, !flip_y)
{
parse_lion();
add_ctrl(m_num_cb);
m_num_cb.range(2, 10);
//m_num_cb.num_steps(8);
m_num_cb.label("N=%.2f");
m_num_cb.no_transform();
}
virtual void on_draw()
{
unsigned i;
int width = rbuf_window().width();
int height = rbuf_window().height();
pixfmt pf(rbuf_window());
typedef agg::renderer_mclip<pixfmt> base_ren_type;
base_ren_type r(pf);
agg::renderer_scanline_aa_solid<base_ren_type> rs(r);
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);
r.clear(agg::rgba(1, 1, 1));
r.reset_clipping(false); // Visibility: "false" means "no visible regions"
int x, y;
double n = m_num_cb.value();
for(x = 0; x < n; x++)
{
for(y = 0; y < n; y++)
{
int x1 = int(width * x / n);
int y1 = int(height * y / n);
int x2 = int(width * (x + 1) / n);
int y2 = int(height * (y + 1) / n);
r.add_clip_box(x1 + 5, y1 + 5, x2 - 5, y2 - 5);
}
}
// Render the lion
agg::conv_transform<agg::path_storage, agg::trans_affine> trans(g_path, mtx);
agg::render_all_paths(g_rasterizer, g_scanline, rs, trans, g_colors, g_path_idx, g_npaths);
// The scanline rasterizer allows you to perform clipping to multiple
// regions "manually", like in the following code, but the "embedded" method
// shows much better performance.
//
//for(i = 0; i < g_npaths; i++)
//{
// g_rasterizer.reset();
// g_rasterizer.add_path(trans, g_path_idx[i]);
// rs.color(g_colors[i]);
//
// int x, y;
// double n = m_num_cb.value();
// for(x = 0; x < n; x++)
// {
// for(y = 0; y < n; y++)
// {
// int x1 = int(width * x / n);
// int y1 = int(height * y / n);
// int x2 = int(width * (x + 1) / n);
// int y2 = int(height * (y + 1) / n);
// // r should be of type renderer_base<>
// r.clip_box(agg::rect_i(x1 + 5, y1 + 5, x2 - 5, y2 - 5));
// agg::render_scanlines(g_rasterizer, g_scanline, rs);
// }
// }
//}
// Render random Bresenham lines and markers
agg::renderer_markers<base_ren_type> m(r);
for(i = 0; i < 50; i++)
{
m.line_color(agg::rgba8(rand() & 0x7F,
rand() & 0x7F,
rand() & 0x7F,
(rand() & 0x7F) + 0x7F));
m.fill_color(agg::rgba8(rand() & 0x7F,
rand() & 0x7F,
rand() & 0x7F,
(rand() & 0x7F) + 0x7F));
m.line(m.coord(rand() % width), m.coord(rand() % height),
m.coord(rand() % width), m.coord(rand() % height));
m.marker(rand() % width, rand() % height, rand() % 10 + 5,
agg::marker_e(rand() % agg::end_of_markers));
}
// Render random anti-aliased lines
double w = 5.0;
agg::line_profile_aa profile;
profile.width(w);
typedef agg::renderer_outline_aa<base_ren_type> renderer_type;
renderer_type ren(r, profile);
typedef agg::rasterizer_outline_aa<renderer_type> rasterizer_type;
rasterizer_type ras(ren);
ras.round_cap(true);
for(i = 0; i < 50; i++)
{
ren.color(agg::rgba8(rand() & 0x7F,
rand() & 0x7F,
rand() & 0x7F,
(rand() & 0x7F) + 0x7F));
ras.move_to_d(rand() % width, rand() % height);
ras.line_to_d(rand() % width, rand() % height);
ras.render(false);
}
// Render random circles with gradient
typedef agg::gradient_linear_color<color_type> grad_color;
typedef agg::gradient_circle grad_func;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_gradient<color_type,
interpolator_type,
grad_func,
grad_color> span_grad_type;
agg::trans_affine grm;
grad_func grf;
grad_color grc(agg::rgba8(0,0,0), agg::rgba8(0,0,0));
agg::ellipse ell;
agg::span_allocator<color_type> sa;
interpolator_type inter(grm);
span_grad_type sg(inter, grf, grc, 0, 10);
for(i = 0; i < 50; i++)
{
x = rand() % width;
y = rand() % height;
double radius = rand() % 10 + 5;
grm.reset();
grm *= agg::trans_affine_scaling(radius / 10.0);
grm *= agg::trans_affine_translation(x, y);
grm.invert();
grc.colors(agg::rgba8(255, 255, 255, 0),
agg::rgba8(rand() & 0x7F,
rand() & 0x7F,
rand() & 0x7F,
255));
sg.color_function(grc);
ell.init(x, y, radius, radius, 32);
g_rasterizer.add_path(ell);
agg::render_scanlines_aa(g_rasterizer, g_scanline, r, sa, sg);
}
r.reset_clipping(true); // "true" means "all rendering buffer is visible".
agg::render_ctrl(g_rasterizer, g_scanline, r, m_num_cb);
}
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(pix_format, flip_y);
app.caption("AGG Example. Clipping to multiple rectangle regions");
if(app.init(512, 400, agg::window_resize))
{
return app.run();
}
return 1;
}