Marianna: 1 revision

2008-05-15T18:00:47Z

1 revision

Andy at 15:09, 20 December 2006

2006-12-20T15:09:31Z

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An example from [http://antigrain.com The Antigrain Graphics (AGG)] code extended to 7 vertices.

[[Image:Agg-intersection.png|right|thumb|202px]]

<nowiki>
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_pixfmt_rgb.h"
#include "platform/agg_platform_support.h"
#include "ctrl/agg_slider_ctrl.h"
#include "ctrl/agg_cbox_ctrl.h"

enum flip_y_e { flip_y = true };

#define NUMPOINTS 7

namespace agg
{

class square
{
public:
square(double size) : m_size(size) {}

template<class Rasterizer, class Scanline, class Renderer, class ColorT>
void draw(Rasterizer& ras, Scanline& sl, Renderer& ren, ColorT color,
double x, double y)
{
ras.reset();
ras.move_to_d(x*m_size, y*m_size);
ras.line_to_d(x*m_size+m_size, y*m_size);
ras.line_to_d(x*m_size+m_size, y*m_size+m_size);
ras.line_to_d(x*m_size, y*m_size+m_size);
agg::render_scanlines_aa_solid(ras, sl, ren, color);
}

private:
double m_size;
};

template<class Renderer> class renderer_enlarged
{
public:
renderer_enlarged(Renderer& ren, double size) :
m_ren(ren),
m_square(size),
m_size(size) {}

//--------------------------------------------------------------------
void color(rgba8 c) { m_color = c; }

//--------------------------------------------------------------------
void prepare() {}

//--------------------------------------------------------------------
template<class Scanline> void render(const Scanline& sl)
{
int y = sl.y();

unsigned num_spans = sl.num_spans();
typename Scanline::const_iterator span = sl.begin();

do
{
int x = span->x;
const typename Scanline::cover_type* covers = span->covers;
int num_pix = span->len;

do
{
int a = (*covers++ * m_color.a) >> 8;
m_square.draw(m_ras, m_sl, m_ren,
rgba8(m_color.r, m_color.g, m_color.b, a),
x, y);
++x;
}
while(--num_pix);
}
while(--num_spans);
}

private:
rasterizer_scanline_aa<> m_ras;
scanline_u8 m_sl;
Renderer& m_ren;
square m_square;
rgba8 m_color;
double m_size;
};

};

class the_application : public agg::platform_support
{
double m_x[NUMPOINTS];
double m_y[NUMPOINTS];
double m_dx;
double m_dy;
int m_idx;
int m_numPoints;

agg::slider_ctrl<agg::rgba8> m_slider1;
agg::slider_ctrl<agg::rgba8> m_slider2;

public:
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_slider1(80, 10, 600-10, 19, !flip_y),
m_slider2(80, 10+20, 600-10, 19+20, !flip_y)
{
m_idx = -1;
m_numPoints = NUMPOINTS;
m_x[0] = 57; m_y[0] = 100;
m_x[1] = 369; m_y[1] = 170;
m_x[2] = 143; m_y[2] = 310;
m_x[3] = 153; m_y[3] = 310;
m_x[4] = 143; m_y[4] = 360;
m_x[5] = 173; m_y[5] = 360;
m_x[6] = 173; m_y[6] = 380;

add_ctrl(m_slider1);
add_ctrl(m_slider2);

m_slider1.range(8.0, 100.0);
m_slider1.num_steps(23);
m_slider1.value(32.0);

m_slider2.range(0.1, 3.0);
m_slider2.value(1.0);

m_slider1.label("Pixel size=%1.0f");
m_slider2.label("Gamma=%4.3f");

m_slider1.no_transform();
m_slider2.no_transform();
}

virtual ~the_application()
{
}

virtual void on_init()
{
}

virtual void on_draw()
{
typedef agg::renderer_base<agg::pixfmt_bgr24> ren_base;

agg::pixfmt_bgr24 pixf(rbuf_window());
ren_base ren(pixf);
agg::scanline_u8 sl;

ren.clear(agg::rgba(1,1,1));

agg::rasterizer_scanline_aa<> ras;

int size_mul = int(m_slider1.value());

ras.gamma(agg::gamma_power(m_slider2.value()));
ras.filling_rule(agg::fill_even_odd);

agg::renderer_enlarged<ren_base> ren_en(ren, size_mul);

ras.reset();

ras.move_to_d(m_x[0]/size_mul, m_y[0]/size_mul);
for (int i = 0; i < m_numPoints; i++)
{
ras.line_to_d(m_x[i]/size_mul, m_y[i]/size_mul);
}

ren_en.color(agg::rgba8(0,255,0, 255));
agg::render_scanlines(ras, sl, ren_en);

agg::render_scanlines_aa_solid(ras, sl, ren, agg::rgba8(0,0,0));

ras.gamma(agg::gamma_none());

agg::path_storage ps;
agg::conv_stroke<agg::path_storage> pg(ps);
pg.width(2.0);

for (int i = 0; i < m_numPoints; i++)
{
int nextPoint = (i+1)%m_numPoints;
ps.remove_all();
ps.move_to(m_x[i], m_y[i]);
ps.line_to(m_x[nextPoint], m_y[nextPoint]);
ras.add_path(pg);
agg::render_scanlines_aa_solid(ras, sl, ren, agg::rgba8(0,150,160, 200));
}

// Render the controls
agg::render_ctrl(ras, sl, ren, m_slider1);
agg::render_ctrl(ras, sl, ren, m_slider2);
}

virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
unsigned i;
for (i = 0; i < m_numPoints; i++)
{
if(sqrt( (x-m_x[i]) * (x-m_x[i]) + (y-m_y[i]) * (y-m_y[i]) ) < 10.0)
{
m_dx = x - m_x[i];
m_dy = y - m_y[i];
m_idx = i;
break;
}
}
if(i == m_numPoints + 1)
{
if(agg::point_in_triangle(m_x[0], m_y[0],
m_x[1], m_y[1],
m_x[2], m_y[2],
x, y))
{
m_dx = x - m_x[0];
m_dy = y - m_y[0];
m_idx = m_numPoints + 1;
}
}
}
}

virtual void on_mouse_move(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_idx == m_numPoints + 1)
{
double dx = x - m_dx;
double dy = y - m_dy;
m_x[1] -= m_x[0] - dx;
m_y[1] -= m_y[0] - dy;
m_x[2] -= m_x[0] - dx;
m_y[2] -= m_y[0] - dy;
m_x[0] = dx;
m_y[0] = dy;
force_redraw();
return;
}

if(m_idx >= 0)
{
m_x[m_idx] = x - m_dx;
m_y[m_idx] = y - m_dy;
force_redraw();
}
}
else
{
on_mouse_button_up(x, y, flags);
}
}

virtual void on_mouse_button_up(int x, int y, unsigned flags)
{
m_idx = -1;
}
};

int agg_main(int argc, char* argv[])
{
the_application app(agg::pix_format_bgr24, flip_y);
app.caption("AGG Example. Anti-Aliasing Demo");

if(app.init(600, 400, agg::window_resize))
{
return app.run();
}
return 1;
}

</nowiki>

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Marianna: 1 revision

Andy at 15:09, 20 December 2006