agg/examples/trans_curve1.cpp

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2021-12-27 20:14:31 +01:00
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_p.h"
#include "agg_renderer_scanline.h"
#include "agg_conv_bspline.h"
#include "agg_conv_segmentator.h"
#include "agg_font_win32_tt.h"
#include "agg_trans_single_path.h"
#include "ctrl/agg_cbox_ctrl.h"
#include "ctrl/agg_slider_ctrl.h"
#include "platform/agg_platform_support.h"
#include "interactive_polygon.h"
#define AGG_BGR24
//#define AGG_RGB24
//#define AGG_BGRA32
//#define AGG_RGBA32
//#define AGG_ARGB32
//#define AGG_ABGR32
//#define AGG_BGR96
//#define AGG_BGRA128
//#define AGG_RGB565
//#define AGG_RGB555
#include "pixel_formats.h"
enum flip_y_e { flip_y = true };
static char text[] =
"Anti-Grain Geometry is designed as a set of loosely coupled "
"algorithms and class templates united with a common idea, "
"so that all the components can be easily combined. Also, "
"the template based design allows you to replace any part of "
"the library without the necessity to modify a single byte in "
"the existing code. ";
class the_application : public agg::platform_support
{
public:
typedef agg::renderer_base<pixfmt> renderer_base;
typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_solid;
typedef agg::scanline_p8 scanline_type;
typedef agg::font_engine_win32_tt_int16 font_engine_type;
typedef agg::font_cache_manager<font_engine_type> font_manager_type;
font_engine_type m_feng;
font_manager_type m_fman;
agg::interactive_polygon m_poly;
agg::slider_ctrl<color_type> m_num_points;
agg::cbox_ctrl<color_type> m_close;
agg::cbox_ctrl<color_type> m_preserve_x_scale;
agg::cbox_ctrl<color_type> m_fixed_len;
agg::cbox_ctrl<color_type> m_animate;
double m_dx[6];
double m_dy[6];
bool m_prev_animate;
the_application(HDC dc, agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_feng(dc),
m_fman(m_feng),
m_poly(6, 5.0),
m_num_points (5.0, 5.0, 340.0, 12.0, !flip_y),
m_close (350, 5.0, "Close", !flip_y),
m_preserve_x_scale(460, 5.0, "Preserve X scale", !flip_y),
m_fixed_len (350, 25.0, "Fixed Length", !flip_y),
m_animate (460, 25.0, "Animate", !flip_y),
m_prev_animate(false)
{
add_ctrl(m_close);
add_ctrl(m_preserve_x_scale);
add_ctrl(m_fixed_len);
add_ctrl(m_animate);
m_preserve_x_scale.status(true);
m_fixed_len.status(true);
m_num_points.range(10.0, 400.0);
m_num_points.value(200.0);
m_num_points.label("Number of intermediate Points = %.3f");
add_ctrl(m_num_points);
}
virtual void on_init()
{
m_poly.xn(0) = 50;
m_poly.yn(0) = 50;
m_poly.xn(1) = 150 + 20;
m_poly.yn(1) = 150 - 20;
m_poly.xn(2) = 250 - 20;
m_poly.yn(2) = 250 + 20;
m_poly.xn(3) = 350 + 20;
m_poly.yn(3) = 350 - 20;
m_poly.xn(4) = 450 - 20;
m_poly.yn(4) = 450 + 20;
m_poly.xn(5) = 550;
m_poly.yn(5) = 550;
}
virtual void on_draw()
{
pixfmt pixf(rbuf_window());
renderer_base rb(pixf);
renderer_solid r(rb);
rb.clear(agg::rgba(1, 1, 1));
scanline_type sl;
agg::rasterizer_scanline_aa<> ras;
m_poly.close(m_close.status());
agg::simple_polygon_vertex_source path(m_poly.polygon(),
m_poly.num_points(),
false,
m_close.status());
typedef agg::conv_bspline<agg::simple_polygon_vertex_source> conv_bspline_type;
conv_bspline_type bspline(path);
bspline.interpolation_step(1.0 / m_num_points.value());
agg::trans_single_path tcurve;
tcurve.add_path(bspline);
tcurve.preserve_x_scale(m_preserve_x_scale.status());
if(m_fixed_len.status()) tcurve.base_length(1120);
typedef agg::conv_curve<font_manager_type::path_adaptor_type> conv_font_curve_type;
typedef agg::conv_segmentator<conv_font_curve_type> conv_font_segm_type;
typedef agg::conv_transform<conv_font_segm_type, agg::trans_single_path> conv_font_trans_type;
conv_font_curve_type fcurves(m_fman.path_adaptor());
conv_font_segm_type fsegm(fcurves);
conv_font_trans_type ftrans(fsegm, tcurve);
fsegm.approximation_scale(3.0);
fcurves.approximation_scale(2.0);
m_feng.height(40.0);
//m_feng.italic(true);
if(m_feng.create_font("Times New Roman", agg::glyph_ren_outline))
{
double x = 0.0;
double y = 3.0;
const char* p = text;
while(*p)
{
const agg::glyph_cache* glyph = m_fman.glyph(*p);
if(glyph)
{
if(x > tcurve.total_length()) break;
m_fman.add_kerning(&x, &y);
m_fman.init_embedded_adaptors(glyph, x, y);
if(glyph->data_type == agg::glyph_data_outline)
{
ras.reset();
ras.add_path(ftrans);
r.color(agg::srgba8(0, 0, 0));
agg::render_scanlines(ras, sl, r);
}
// increment pen position
x += glyph->advance_x;
y += glyph->advance_y;
}
++p;
}
}
typedef agg::conv_stroke<conv_bspline_type> conv_stroke_type;
conv_stroke_type stroke(bspline);
stroke.width(2.0);
r.color(agg::srgba8(170, 50, 20, 100));
ras.add_path(stroke);
agg::render_scanlines(ras, sl, r);
//--------------------------
// Render the "poly" tool and controls
r.color(agg::rgba(0, 0.3, 0.5, 0.3));
ras.add_path(m_poly);
agg::render_scanlines(ras, sl, r);
agg::render_ctrl(ras, sl, rb, m_close);
agg::render_ctrl(ras, sl, rb, m_preserve_x_scale);
agg::render_ctrl(ras, sl, rb, m_fixed_len);
agg::render_ctrl(ras, sl, rb, m_animate);
agg::render_ctrl(ras, sl, rb, m_num_points);
//--------------------------
}
virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_poly.on_mouse_button_down(x, y))
{
force_redraw();
}
}
}
virtual void on_mouse_move(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_poly.on_mouse_move(x, y))
{
force_redraw();
}
}
if((flags & agg::mouse_left) == 0)
{
on_mouse_button_up(x, y, flags);
}
}
virtual void on_mouse_button_up(int x, int y, unsigned flags)
{
if(m_poly.on_mouse_button_up(x, y))
{
force_redraw();
}
}
virtual void on_key(int x, int y, unsigned key, unsigned flags)
{
}
virtual void on_ctrl_change()
{
if(m_animate.status() != m_prev_animate)
{
if(m_animate.status())
{
on_init();
int i;
for(i = 0; i < 6; i++)
{
m_dx[i] = ((rand() % 1000) - 500) * 0.01;
m_dy[i] = ((rand() % 1000) - 500) * 0.01;
}
wait_mode(false);
}
else
{
wait_mode(true);
}
m_prev_animate = m_animate.status();
}
}
void move_point(double& x, double& y, double& dx, double& dy)
{
if(x < 0.0) { x = 0.0; dx = -dx; }
if(x > width()) { x = width(); dx = -dx; }
if(y < 0.0) { y = 0.0; dy = -dy; }
if(y > height()) { y = height(); dy = -dy; }
x += dx;
y += dy;
}
virtual void on_idle()
{
int i;
for(i = 0; i < 6; i++)
{
move_point(m_poly.xn(i), m_poly.yn(i), m_dx[i], m_dy[i]);
}
force_redraw();
}
};
int agg_main(int argc, char* argv[])
{
HDC dc = ::GetDC(0);
the_application app(dc, pix_format, flip_y);
app.caption("AGG Example. Non-linear \"Along-A-Curve\" Transformer");
if(app.init(600, 600, agg::window_resize))
{
return app.run();
}
::ReleaseDC(0, dc);
return 1;
}