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/* Pixbufs
*
* A GdkPixbuf represents an image, normally in RGB or RGBA format.
* Pixbufs are normally used to load files from disk and perform
* image scaling.
*
* This demo is not all that educational, but looks cool. It was written
* by Extreme Pixbuf Hacker Federico Mena Quintero. It also shows
* off how to use GtkDrawingArea to do a simple animation.
*
* Look at the Image demo for additional pixbuf usage examples.
*
*/
//#include <config.h>
#include <gtkmm.h>
#include <math.h>
#include "demo-common.h"
#define FRAME_DELAY 50
#define BACKGROUND_NAME "background.jpg"
#ifndef M_PI
#define M_PI 3.1415927
#endif
static const char* image_names[] = {
"apple-red.png",
"gnome-applets.png",
"gnome-calendar.png",
"gnome-foot.png",
"gnome-gmush.png",
"gnome-gimp.png",
"gnome-gsame.png",
"gnu-keys.png"
};
enum { N_IMAGES = G_N_ELEMENTS(image_names) };
class Example_Pixbufs : public Gtk::Window
{
public:
Example_Pixbufs();
virtual ~Example_Pixbufs();
protected:
virtual void load_pixbufs();
//signal handlers:
virtual bool on_drawingarea_draw(const Cairo::RefPtr<Cairo::Context>& cr);
virtual bool on_timeout();
//Member widgets:
Glib::RefPtr<Gdk::Pixbuf> m_refPixbuf;
Glib::RefPtr<Gdk::Pixbuf> m_refPixbuf_Background;
Glib::RefPtr<Gdk::Pixbuf> m_images[N_IMAGES];
Gtk::DrawingArea m_DrawingArea;
sigc::connection m_TimeoutConnection;
guint m_back_width, m_back_height;
gint m_frame_num;
};
//Called by DemoWindow;
Gtk::Window* do_pixbufs()
{
return new Example_Pixbufs();
}
Example_Pixbufs::Example_Pixbufs()
{
m_back_width = 0;
m_back_height = 0;
set_title("Pixbufs");
set_resizable(false);
load_pixbufs();
set_size_request(m_back_width, m_back_height);
m_refPixbuf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, FALSE, 8, m_back_width, m_back_height);
m_DrawingArea.signal_draw().connect(sigc::mem_fun(*this, &Example_Pixbufs::on_drawingarea_draw));
add(m_DrawingArea);
m_TimeoutConnection = Glib::signal_timeout().connect(
sigc::mem_fun(*this, &Example_Pixbufs::on_timeout), FRAME_DELAY);
show_all();
}
Example_Pixbufs::~Example_Pixbufs()
{
m_TimeoutConnection.disconnect(); //Will probably happen anyway, in the destrctor.
}
/* Loads the m_images for the demo and returns whether the operation succeeded */
void Example_Pixbufs::load_pixbufs()
{
if(m_refPixbuf_Background)
return; /* already loaded earlier */
std::string filename_background = BACKGROUND_NAME;
m_refPixbuf_Background = Gdk::Pixbuf::create_from_file(demo_find_file(filename_background));
m_back_width = m_refPixbuf_Background->get_width();
m_back_height = m_refPixbuf_Background->get_height();
for(unsigned i = 0; i < N_IMAGES; ++i)
{
std::string filename = image_names[i];
Glib::RefPtr<Gdk::Pixbuf> pixbuf = Gdk::Pixbuf::create_from_file(demo_find_file(filename));
m_images[i] = pixbuf;
}
}
/* Draw callback for the drawing area */
bool Example_Pixbufs::on_drawingarea_draw(const Cairo::RefPtr<Cairo::Context>& cr)
{
Gdk::Cairo::set_source_pixbuf(cr, m_refPixbuf_Background);
cr->paint();
return true;
}
#define CYCLE_LEN 60
/* Timeout handler to regenerate the frame */
bool Example_Pixbufs::on_timeout()
{
m_refPixbuf_Background->copy_area( 0, 0, m_back_width, m_back_height, m_refPixbuf, 0, 0);
double f = (double) (m_frame_num % CYCLE_LEN) / CYCLE_LEN;
double xmid = m_back_width / 2.0;
double ymid = m_back_height / 2.0;
double radius = MIN (xmid, ymid) / 2.0;
for (int i = 0; i < N_IMAGES; i++)
{
double ang = 2.0 * M_PI * (double) i / N_IMAGES - f * 2.0 * M_PI;
int iw = m_images[i]->get_width();
int ih = m_images[i]->get_height();
double r = radius + (radius / 3.0) * sin (f * 2.0 * M_PI);
double xpos = floor (xmid + r * cos(ang) - iw / 2.0 + 0.5);
double ypos = floor (ymid + r * sin(ang) - ih / 2.0 + 0.5);
double k = (i & 1) ? sin (f * 2.0 * M_PI) : cos (f * 2.0 * M_PI);
k = 2.0 * k * k;
k = MAX (0.25, k);
GdkRectangle r1, r2, dest;
r1.x = (int)xpos;
r1.y = (int)ypos;
r1.width = (int)(iw * k);
r1.height = (int)(ih * k);
r2.x = 0;
r2.y = 0;
r2.width = m_back_width;
r2.height = m_back_height;
if (gdk_rectangle_intersect (&r1, &r2, &dest))
{
m_images[i]->composite(m_refPixbuf,
dest.x, dest.y,
dest.width, dest.height,
xpos, ypos,
k, k,
Gdk::INTERP_NEAREST,
(int)((i & 1)
? MAX (127, fabs (255 * sin (f * 2.0 * M_PI)))
: MAX (127, fabs (255 * cos (f * 2.0 * M_PI)))));
}
}
m_DrawingArea.queue_draw();
m_frame_num++;
return true;
}
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