trans_curve1_ft.cpp

#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_freetype.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_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_freetype_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<agg::rgba8> m_num_points;
    agg::cbox_ctrl<agg::rgba8>   m_close;
    agg::cbox_ctrl<agg::rgba8>   m_preserve_x_scale;
    agg::cbox_ctrl<agg::rgba8>   m_fixed_len;
    agg::cbox_ctrl<agg::rgba8>   m_animate;
    double                       m_dx[6];
    double                       m_dy[6];
    bool                         m_prev_animate;

    the_application(agg::pix_format_e format, bool flip_y) :
        agg::platform_support(format, flip_y),
        m_feng(),
        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);

        if(m_feng.load_font(full_file_name("timesi.ttf"), 0, agg::glyph_ren_outline))
        {
            double x = 0.0;
            double y = 3.0;
            const char* p = text;

            m_feng.hinting(false);
            m_feng.height(40);

            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::rgba8(0, 0, 0));
                        agg::render_scanlines(ras, sl, r);
                    }

                    // increment pen position
                    x += glyph->advance_x;
                    y += glyph->advance_y;
                }
                ++p;
            }
        }
        else
        {
            message("Please copy file timesi.ttf to the current directory\n"
                    "or download it from http://www.antigrain.com/timesi.zip");
        }



        typedef agg::conv_stroke<conv_bspline_type> conv_stroke_type;
        conv_stroke_type stroke(bspline);

        stroke.width(2.0);

        r.color(agg::rgba8(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[])
{
    the_application app(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();
    }
    return 1;
}