agg/examples/conv_stroke.cpp

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C++
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2021-12-27 20:14:31 +01:00
#include <math.h>
#include <stdio.h>
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_conv_stroke.h"
#include "agg_conv_dash.h"
#include "agg_conv_curve.h"
#include "agg_conv_contour.h"
#include "agg_conv_smooth_poly1.h"
#include "agg_conv_marker.h"
#include "agg_arrowhead.h"
#include "agg_vcgen_markers_term.h"
#include "agg_scanline_p.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_rbox_ctrl.h"
#define AGG_BGR24
//#define AGG_BGR96
#include "pixel_formats.h"
enum flip_y_e { flip_y = true };
class the_application : public agg::platform_support
{
double m_x[3];
double m_y[3];
double m_dx;
double m_dy;
int m_idx;
agg::rbox_ctrl<color_type> m_join;
agg::rbox_ctrl<color_type> m_cap;
agg::slider_ctrl<color_type> m_width;
agg::slider_ctrl<color_type> m_miter_limit;
public:
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_idx(-1),
m_join(10.0, 10.0, 133.0, 80.0, !flip_y),
m_cap(10.0, 80.0 + 10.0, 133.0, 80.0 + 80.0, !flip_y),
m_width(130 + 10.0, 10.0 + 4.0, 500.0 - 10.0, 10.0 + 8.0 + 4.0, !flip_y),
m_miter_limit(130 + 10.0, 20.0 + 10.0 + 4.0, 500.0 - 10.0, 20.0 + 10.0 + 8.0 + 4.0, !flip_y)
{
m_x[0] = 57 + 100; m_y[0] = 60;
m_x[1] = 369 + 100; m_y[1] = 170;
m_x[2] = 143 + 100; m_y[2] = 310;
add_ctrl(m_join);
m_join.text_size(7.5);
m_join.text_thickness(1.0);
m_join.add_item("Miter Join");
m_join.add_item("Miter Join Revert");
m_join.add_item("Round Join");
m_join.add_item("Bevel Join");
m_join.cur_item(2);
add_ctrl(m_cap);
m_cap.add_item("Butt Cap");
m_cap.add_item("Square Cap");
m_cap.add_item("Round Cap");
m_cap.cur_item(2);
add_ctrl(m_width);
m_width.range(3.0, 40.0);
m_width.value(20.0);
m_width.label("Width=%1.2f");
add_ctrl(m_miter_limit);
m_miter_limit.range(1.0, 10.0);
m_miter_limit.value(4.0);
m_miter_limit.label("Miter Limit=%1.2f");
m_join.no_transform();
m_cap.no_transform();
m_width.no_transform();
m_miter_limit.no_transform();
}
virtual void on_init()
{
}
virtual void on_draw()
{
typedef agg::renderer_base<pixfmt> ren_base;
pixfmt pixf(rbuf_window());
ren_base renb(pixf);
renb.clear(agg::rgba(1, 1, 1));
agg::rasterizer_scanline_aa<> ras;
agg::scanline_p8 sl;
agg::path_storage path;
path.move_to(m_x[0], m_y[0]);
path.line_to((m_x[0] + m_x[1]) / 2, (m_y[0] + m_y[1]) / 2); // This point is added only to check for numerical stability
path.line_to(m_x[1], m_y[1]);
path.line_to(m_x[2], m_y[2]);
path.line_to(m_x[2], m_y[2]); // This point is added only to check for numerical stability
path.move_to((m_x[0] + m_x[1]) / 2, (m_y[0] + m_y[1]) / 2);
path.line_to((m_x[1] + m_x[2]) / 2, (m_y[1] + m_y[2]) / 2);
path.line_to((m_x[2] + m_x[0]) / 2, (m_y[2] + m_y[0]) / 2);
path.close_polygon();
agg::line_cap_e cap = agg::butt_cap;
if(m_cap.cur_item() == 1) cap = agg::square_cap;
if(m_cap.cur_item() == 2) cap = agg::round_cap;
agg::line_join_e join = agg::miter_join;
if(m_join.cur_item() == 1) join = agg::miter_join_revert;
if(m_join.cur_item() == 2) join = agg::round_join;
if(m_join.cur_item() == 3) join = agg::bevel_join;
// (1)
agg::conv_stroke<agg::path_storage> stroke(path);
stroke.line_join(join);
stroke.line_cap(cap);
stroke.miter_limit(m_miter_limit.value());
stroke.width(m_width.value());
ras.add_path(stroke);
agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba(0.8, 0.7, 0.6));
// (1)
// (2)
agg::conv_stroke<agg::path_storage> poly1(path);
poly1.width(1.5);
ras.add_path(poly1);
agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba(0,0,0));
// (2)
// (3)
agg::conv_dash<agg::conv_stroke<agg::path_storage> > poly2_dash(stroke);
agg::conv_stroke<agg::conv_dash<agg::conv_stroke<agg::path_storage> > > poly2(poly2_dash);
poly2.miter_limit(4.0);
poly2.width(m_width.value() / 5.0);
poly2.line_cap(cap);
poly2.line_join(join);
poly2_dash.add_dash(20.0, m_width.value() / 2.5);
ras.add_path(poly2);
agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba(0,0,0.3));
// (3)
// (4)
ras.add_path(path);
agg::render_scanlines_aa_solid(ras, sl, renb, agg::rgba(0.0, 0.0, 0.0, 0.2));
// (4)
agg::render_ctrl(ras, sl, renb, m_join);
agg::render_ctrl(ras, sl, renb, m_cap);
agg::render_ctrl(ras, sl, renb, m_width);
agg::render_ctrl(ras, sl, renb, m_miter_limit);
}
virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
unsigned i;
for (i = 0; i < 3; i++)
{
if(sqrt( (x-m_x[i]) * (x-m_x[i]) + (y-m_y[i]) * (y-m_y[i]) ) < 20.0)
{
m_dx = x - m_x[i];
m_dy = y - m_y[i];
m_idx = i;
break;
}
}
if(i == 3)
{
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 = 3;
}
}
}
}
virtual void on_mouse_move(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_idx == 3)
{
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;
}
virtual void on_key(int x, int y, unsigned key, unsigned flags)
{
double dx = 0;
double dy = 0;
switch(key)
{
case agg::key_left: dx = -0.1; break;
case agg::key_right: dx = 0.1; break;
case agg::key_up: dy = 0.1; break;
case agg::key_down: dy = -0.1; break;
}
m_x[0] += dx;
m_y[0] += dy;
m_x[1] += dx;
m_y[1] += dy;
force_redraw();
}
};
int agg_main(int argc, char* argv[])
{
the_application app(pix_format, flip_y);
app.caption("AGG Example. Line Join");
if(app.init(500, 330, 0))
{
return app.run();
}
return 1;
}