agg/examples/pattern_perspective.cpp

298 lines
9.1 KiB
C++

#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#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_path_storage.h"
#include "agg_conv_transform.h"
#include "agg_trans_affine.h"
#include "agg_trans_bilinear.h"
#include "agg_trans_perspective.h"
#include "agg_span_interpolator_linear.h"
#include "agg_span_interpolator_trans.h"
#include "agg_span_allocator.h"
#include "agg_image_accessors.h"
#include "ctrl/agg_rbox_ctrl.h"
#include "platform/agg_platform_support.h"
#include "interactive_polygon.h"
#define AGG_BGR24
#include "pixel_formats.h"
#include "agg_span_image_filter_rgb.h"
#define span_image_filter_2x2 agg::span_image_filter_rgb_2x2
#define span_image_filter_nn agg::span_image_filter_rgb_nn
enum flip_y_e { flip_y = true };
agg::rasterizer_scanline_aa<> g_rasterizer;
agg::scanline_u8 g_scanline;
double g_x1 = 0;
double g_y1 = 0;
double g_x2 = 0;
double g_y2 = 0;
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::renderer_base<pixfmt_pre> renderer_base_pre;
agg::interactive_polygon m_quad;
agg::rbox_ctrl<agg::rgba> m_trans_type;
bool m_test_flag;
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_quad(4, 5.0),
m_trans_type(460, 5.0, 420+170.0, 60.0, !flip_y),
m_test_flag(false)
{
m_trans_type.text_size(8);
m_trans_type.text_thickness(1);
m_trans_type.add_item("Affine");
m_trans_type.add_item("Bilinear");
m_trans_type.add_item("Perspective");
m_trans_type.cur_item(2);
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);
}
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())
{
typedef agg::span_interpolator_linear_subdiv<agg::trans_perspective, 8> 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;
}
}
}
virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_quad.on_mouse_button_down(x, y))
{
force_redraw();
}
else
{
start_timer();
m_test_flag = true;
on_draw();
on_draw();
on_draw();
on_draw();
char buf[100];
sprintf(buf, "time=%.3f", elapsed_time());
m_test_flag = false;
force_redraw();
message(buf);
}
}
}
virtual void on_mouse_move(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_quad.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_quad.on_mouse_button_up(x, y))
{
force_redraw();
}
}
};
int agg_main(int argc, char* argv[])
{
the_application app(pix_format, flip_y);
app.caption("AGG Example. Pattern Perspective Transformations");
const char* img_name = "agg";
if(argc >= 2) img_name = argv[1];
if(!app.load_img(0, img_name))
{
char buf[256];
if(strcmp(img_name, "agg") == 0)
{
sprintf(buf, "File not found: %s%s. Download http://www.antigrain.com/%s%s\n"
"or copy it from the ../art directory.",
img_name, app.img_ext(), img_name, app.img_ext());
}
else
{
sprintf(buf, "File not found: %s%s", img_name, app.img_ext());
}
app.message(buf);
return 1;
}
if(app.init(600, 600, agg::window_resize))
{
return app.run();
}
return 1;
}