C++ interactive_polygon::xn方法代码示例

    virtual void on_init()
    {
        g_x1 = 0.0;
        g_y1 = 0.0;
        g_x2 = rbuf_img(0).width();
        g_y2 = rbuf_img(0).height();

        double x1 = g_x1;// * 100.0;
        double y1 = g_y1;// * 100.0;
        double x2 = g_x2;// * 100.0;
        double y2 = g_y2;// * 100.0;

        double dx = width()  / 2.0 - (x2 - x1) / 2.0;
        double dy = height() / 2.0 - (y2 - y1) / 2.0;
        m_quad.xn(0) = floor(x1 + dx);
        m_quad.yn(0) = floor(y1 + dy);// - 150;
        m_quad.xn(1) = floor(x2 + dx);
        m_quad.yn(1) = floor(y1 + dy);// - 110;
        m_quad.xn(2) = floor(x2 + dx);
        m_quad.yn(2) = floor(y2 + dy);// - 300;
        m_quad.xn(3) = floor(x1 + dx);
        m_quad.yn(3) = floor(y2 + dy);// - 200;

        pixfmt pixf(rbuf_img(0));
        pixf.apply_gamma_dir(m_gamma_lut);
    }

 virtual void on_idle()
 {
     int i;
     for(i = 0; i < 6; i++)
     {
         move_point(m_poly1.xn(i), m_poly1.yn(i), m_dx1[i], m_dy1[i]);
         move_point(m_poly2.xn(i), m_poly2.yn(i), m_dx2[i], m_dy2[i]);
         normalize_point(i);
     }
     force_redraw();
 }

 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();
 }

    the_application(agg::pix_format_e format, bool flip_y) :
        agg::platform_support(format, flip_y),
        m_quad(4, 5.0),
        m_trans_type(420, 5.0, 420+130.0, 55.0, !flip_y)
    {
        parse_lion();
        m_quad.xn(0) = g_x1;
        m_quad.yn(0) = g_y1;
        m_quad.xn(1) = g_x2;
        m_quad.yn(1) = g_y1;
        m_quad.xn(2) = g_x2;
        m_quad.yn(2) = g_y2;
        m_quad.xn(3) = g_x1;
        m_quad.yn(3) = g_y2;

        m_trans_type.add_item("Bilinear");
        m_trans_type.add_item("Perspective");
        m_trans_type.cur_item(0);
        add_ctrl(m_trans_type);
    }

    virtual void on_init()
    {
        g_x1 = -150;
        g_y1 = -150;
        g_x2 =  150;
        g_y2 =  150;

        double trans_x1 = -200;
        double trans_y1 = -200;
        double trans_x2 =  200;
        double trans_y2 =  200;

        double dx = width()  / 2.0 - (trans_x2 + trans_x1) / 2.0;
        double dy = height() / 2.0 - (trans_y2 + trans_y1) / 2.0;
        m_quad.xn(0) = floor(trans_x1 + dx);
        m_quad.yn(0) = floor(trans_y1 + dy);
        m_quad.xn(1) = floor(trans_x2 + dx);
        m_quad.yn(1) = floor(trans_y1 + dy);
        m_quad.xn(2) = floor(trans_x2 + dx);
        m_quad.yn(2) = floor(trans_y2 + dy);
        m_quad.xn(3) = floor(trans_x1 + dx);
        m_quad.yn(3) = floor(trans_y2 + dy);
    }

 void normalize_point(unsigned i)
 {
     double d = agg::calc_distance(m_poly1.xn(i), m_poly1.yn(i), 
                                   m_poly2.xn(i), m_poly2.yn(i));
     // 28.8 is 20 * sqrt(2)
     if(d > 28.28)
     {
         m_poly2.xn(i) = m_poly1.xn(i) + (m_poly2.xn(i) - m_poly1.xn(i)) * 28.28 / d;
         m_poly2.yn(i) = m_poly1.yn(i) + (m_poly2.yn(i) - m_poly1.yn(i)) * 28.28 / d;
     }
 }

 virtual void on_init()
 {
     double dx = width()  / 2.0 - (m_quad.xn(1) - m_quad.xn(0)) / 2.0;
     double dy = height() / 2.0 - (m_quad.yn(2) - m_quad.yn(0)) / 2.0;
     m_quad.xn(0) += dx;
     m_quad.yn(0) += dy;
     m_quad.xn(1) += dx;
     m_quad.yn(1) += dy;
     m_quad.xn(2) += dx;
     m_quad.yn(2) += dy;
     m_quad.xn(3) += dx;
     m_quad.yn(3) += dy;
 }

    virtual void on_init()
    {
        m_quad1.xn(0) = 50;
        m_quad1.yn(0) = 200 - 20;
        m_quad1.xn(1) = width() / 2 - 25;
        m_quad1.yn(1) = 200;
        m_quad1.xn(2) = width() / 2 - 25;
        m_quad1.yn(2) = height() - 50 - 20;
        m_quad1.xn(3) = 50;
        m_quad1.yn(3) = height() - 50;

        m_quad2.xn(0) = width() / 2 + 25;
        m_quad2.yn(0) = 200 - 20;
        m_quad2.xn(1) = width() - 50;
        m_quad2.yn(1) = 200;
        m_quad2.xn(2) = width() - 50;
        m_quad2.yn(2) = height() - 50 - 20;
        m_quad2.xn(3) = width() / 2 + 25;
        m_quad2.yn(3) = height() - 50;
    }

 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_key(int x, int y, unsigned key, unsigned flags) 
 {
     if(key == ' ')
     {
         double cx = (m_quad.xn(0) + m_quad.xn(1) + m_quad.xn(2) + m_quad.xn(3)) / 4;
         double cy = (m_quad.yn(0) + m_quad.yn(1) + m_quad.yn(2) + m_quad.yn(3)) / 4;
         agg::trans_affine tr = agg::trans_affine_translation(-cx, -cy);
         tr *= agg::trans_affine_rotation(agg::pi / 2.0);
         tr *= agg::trans_affine_translation(cx, cy);
         tr.transform(&m_quad.xn(0), &m_quad.yn(0));
         tr.transform(&m_quad.xn(1), &m_quad.yn(1));
         tr.transform(&m_quad.xn(2), &m_quad.yn(2));
         tr.transform(&m_quad.xn(3), &m_quad.yn(3));
         force_redraw();
     }
 }

    virtual void on_init()
    {
        m_poly1.xn(0) =  10 + 50;
        m_poly1.yn(0) = -10 + 50;
        m_poly1.xn(1) =  10 + 150 + 20;
        m_poly1.yn(1) = -10 + 150 - 20;
        m_poly1.xn(2) =  10 + 250 - 20;
        m_poly1.yn(2) = -10 + 250 + 20;
        m_poly1.xn(3) =  10 + 350 + 20;
        m_poly1.yn(3) = -10 + 350 - 20;
        m_poly1.xn(4) =  10 + 450 - 20;
        m_poly1.yn(4) = -10 + 450 + 20;
        m_poly1.xn(5) =  10 + 550;
        m_poly1.yn(5) = -10 + 550;

        m_poly2.xn(0) = -10 + 50;
        m_poly2.yn(0) =  10 + 50;
        m_poly2.xn(1) = -10 + 150 + 20;
        m_poly2.yn(1) =  10 + 150 - 20;
        m_poly2.xn(2) = -10 + 250 - 20;
        m_poly2.yn(2) =  10 + 250 + 20;
        m_poly2.xn(3) = -10 + 350 + 20;
        m_poly2.yn(3) =  10 + 350 - 20;
        m_poly2.xn(4) = -10 + 450 - 20;
        m_poly2.yn(4) =  10 + 450 + 20;
        m_poly2.xn(5) = -10 + 550;
        m_poly2.yn(5) =  10 + 550;
    }

    virtual void on_draw()
    {
        pixfmt            pixf(rbuf_window());
        pixfmt_pre        pixf_pre(rbuf_window());
        renderer_base     rb(pixf);
        renderer_base_pre rb_pre(pixf_pre);

        if(!m_test_flag)
        {
            rb.clear(agg::rgba(1, 1, 1));
        }

        if(m_trans_type.cur_item() == 0)
        {
            // For the affine parallelogram transformations we
            // calculate the 4-th (implicit) point of the parallelogram
            m_quad.xn(3) = m_quad.xn(0) + (m_quad.xn(2) - m_quad.xn(1));
            m_quad.yn(3) = m_quad.yn(0) + (m_quad.yn(2) - m_quad.yn(1));
        }

        if(!m_test_flag)
        {
            //--------------------------
            // Render the "quad" tool and controls
            g_rasterizer.add_path(m_quad);
            agg::render_scanlines_aa_solid(g_rasterizer, g_scanline, rb, agg::rgba(0, 0.3, 0.5, 0.6));

            //--------------------------
            agg::render_ctrl(g_rasterizer, g_scanline, rb, m_trans_type);
        }

        // Prepare the polygon to rasterize. Here we need to fill
        // the destination (transformed) polygon.
        g_rasterizer.clip_box(0, 0, width(), height());
        g_rasterizer.reset();
        g_rasterizer.move_to_d(m_quad.xn(0), m_quad.yn(0));
        g_rasterizer.line_to_d(m_quad.xn(1), m_quad.yn(1));
        g_rasterizer.line_to_d(m_quad.xn(2), m_quad.yn(2));
        g_rasterizer.line_to_d(m_quad.xn(3), m_quad.yn(3));


        typedef agg::span_allocator<color_type> span_alloc_type;
        span_alloc_type sa;
        agg::image_filter<agg::image_filter_hanning> filter;
    
        typedef agg::wrap_mode_reflect_auto_pow2 remainder_type;
        typedef agg::image_accessor_wrap<pixfmt, 
                                         remainder_type, 
                                         remainder_type> img_source_type;

        pixfmt img_pixf(rbuf_img(0));
        img_source_type img_src(img_pixf);

        enum subdiv_shift_e { subdiv_shift = 2 };
         
        switch(m_trans_type.cur_item())
        {
            case 0:
            {
                // Note that we consruct an affine matrix that transforms
                // a parallelogram to a rectangle, i.e., it's inverted.
                // It's actually the same as:
                // tr(g_x1, g_y1, g_x2, g_y2, m_triangle.polygon());
                // tr.invert();
                agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);

                // Also note that we can use the linear interpolator instead of 
                // arbitrary span_interpolator_trans. It works much faster, 
                // but the transformations must be linear and parellel.
                typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
                interpolator_type interpolator(tr);

                typedef span_image_filter_2x2<img_source_type,
                                              interpolator_type> span_gen_type;
                span_gen_type sg(img_src, interpolator, filter);
                agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                break;
            }

            case 1:
            {
                agg::trans_bilinear tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                if(tr.is_valid())
                {
                    typedef agg::span_interpolator_linear<agg::trans_bilinear> interpolator_type;
                    interpolator_type interpolator(tr);

                    typedef span_image_filter_2x2<img_source_type,
                                                  interpolator_type> span_gen_type;
                    span_gen_type sg(img_src, interpolator, filter);
                    agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                }
                break;
            }

            case 2:
            {
                agg::trans_perspective tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                if(tr.is_valid())
                {
//.........这里部分代码省略.........

    virtual void on_draw()
    {
        if(m_gamma.value() != m_old_gamma)
        {
            m_gamma_lut.gamma(m_gamma.value());
            load_img(0, "spheres");
            pixfmt pixf(rbuf_img(0));
            pixf.apply_gamma_dir(m_gamma_lut);
            m_old_gamma = m_gamma.value();
        }

        pixfmt            pixf(rbuf_window());
        pixfmt_pre        pixf_pre(rbuf_window());
        renderer_base     rb(pixf);
        renderer_base_pre rb_pre(pixf_pre);

        renderer_solid r(rb);

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

        if(m_trans_type.cur_item() < 2)
        {
            // For the affine parallelogram transformations we
            // calculate the 4-th (implicit) point of the parallelogram
            m_quad.xn(3) = m_quad.xn(0) + (m_quad.xn(2) - m_quad.xn(1));
            m_quad.yn(3) = m_quad.yn(0) + (m_quad.yn(2) - m_quad.yn(1));
        }

        //--------------------------
        // Render the "quad" tool and controls
        g_rasterizer.add_path(m_quad);
        r.color(agg::rgba(0, 0.3, 0.5, 0.1));
        agg::render_scanlines(g_rasterizer, g_scanline, r);

        // Prepare the polygon to rasterize. Here we need to fill
        // the destination (transformed) polygon.
        g_rasterizer.clip_box(0, 0, width(), height());
        g_rasterizer.reset();
        int b = 0;
        g_rasterizer.move_to_d(m_quad.xn(0)-b, m_quad.yn(0)-b);
        g_rasterizer.line_to_d(m_quad.xn(1)+b, m_quad.yn(1)-b);
        g_rasterizer.line_to_d(m_quad.xn(2)+b, m_quad.yn(2)+b);
        g_rasterizer.line_to_d(m_quad.xn(3)-b, m_quad.yn(3)+b);

        typedef agg::span_allocator<color_type> span_alloc_type;
        span_alloc_type sa;
        agg::image_filter_bilinear filter_kernel;
        agg::image_filter_lut filter(filter_kernel, true);

        pixfmt pixf_img(rbuf_img(0));
        typedef agg::image_accessor_clone<pixfmt> source_type;
        source_type source(pixf_img);

        start_timer();
        switch(m_trans_type.cur_item())
        {
            case 0:
            {
                agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);

                typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
                interpolator_type interpolator(tr);

                typedef image_filter_2x2_type<source_type, 
                                              interpolator_type> span_gen_type;
                span_gen_type sg(source, interpolator, filter);
                agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                break;
            }

            case 1:
            {
                agg::trans_affine tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);

                typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
                typedef image_resample_affine_type<source_type> span_gen_type;

                interpolator_type interpolator(tr);
                span_gen_type sg(source, interpolator, filter);
                sg.blur(m_blur.value());
                agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                break;
            }

            case 2:
            {
                agg::trans_perspective tr(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
                if(tr.is_valid())
                {
                    typedef agg::span_interpolator_linear_subdiv<agg::trans_perspective> interpolator_type;
                    interpolator_type interpolator(tr);

                    typedef image_filter_2x2_type<source_type,
                                                  interpolator_type> span_gen_type;
                    span_gen_type sg(source, interpolator, filter);
                    agg::render_scanlines_aa(g_rasterizer, g_scanline, rb_pre, sa, sg);
                }
                break;
            }

//.........这里部分代码省略.........