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gtk-demo: Drop the pixbufs demo
It is from a different era, and doesn't show the apis we want to promote. The visuals live on, in the Css/Animated Backgrounds demo.
This commit is contained in:
Matthias Clasen
parent
e0b95c6234
commit
540cffee89
@ -165,17 +165,6 @@
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<file>floppybuddy.gif</file>
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<file>gtk-logo.webm</file>
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</gresource>
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<gresource prefix="/pixbufs">
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<file>apple-red.png</file>
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<file>background.jpg</file>
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<file>gnome-applets.png</file>
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<file>gnome-calendar.png</file>
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<file>gnome-foot.png</file>
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<file>gnome-gmush.png</file>
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<file>gnome-gimp.png</file>
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<file>gnome-gsame.png</file>
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<file>gnu-keys.png</file>
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</gresource>
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<gresource prefix="/sources">
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<file>application_demo.c</file>
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<file>assistant.c</file>
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@ -241,7 +230,6 @@
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<file>password_entry.c</file>
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<file>peg_solitaire.c</file>
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<file>pickers.c</file>
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<file>pixbufs.c</file>
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<file>printing.c</file>
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<file>revealer.c</file>
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<file>rotated_text.c</file>
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@ -62,7 +62,6 @@ demos = files([
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'password_entry.c',
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'peg_solitaire.c',
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'pickers.c',
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'pixbufs.c',
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'printing.c',
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'revealer.c',
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'rotated_text.c',
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@ -1,228 +0,0 @@
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/* Pixbufs
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*
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* A GdkPixbuf represents an image, normally in RGB or RGBA format.
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* Pixbufs are normally used to load files from disk and perform
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* image scaling.
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*
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* This demo is not all that educational, but looks cool. It was written
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* by Extreme Pixbuf Hacker Federico Mena Quintero. It also shows
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* off how to use GtkDrawingArea to do a simple animation.
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*
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* Look at the Image demo for additional pixbuf usage examples.
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*
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*/
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#include <stdlib.h>
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#include <gtk/gtk.h>
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#include <math.h>
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#define BACKGROUND_NAME "/pixbufs/background.jpg"
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static const char *image_names[] = {
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"/pixbufs/apple-red.png",
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"/pixbufs/gnome-applets.png",
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"/pixbufs/gnome-calendar.png",
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"/pixbufs/gnome-foot.png",
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"/pixbufs/gnome-gmush.png",
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"/pixbufs/gnome-gimp.png",
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"/pixbufs/gnome-gsame.png",
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"/pixbufs/gnu-keys.png"
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};
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#define N_IMAGES G_N_ELEMENTS (image_names)
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/* demo window */
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static GtkWidget *window = NULL;
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/* Current frame */
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static GdkPixbuf *frame;
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/* Background image */
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static GdkPixbuf *background;
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static int back_width, back_height;
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/* Images */
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static GdkPixbuf *images[N_IMAGES];
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/* Widgets */
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static GtkWidget *da;
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/* Loads the images for the demo and returns whether the operation succeeded */
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static gboolean
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load_pixbufs (GError **error)
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{
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int i;
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if (background)
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return TRUE; /* already loaded earlier */
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background = gdk_pixbuf_new_from_resource (BACKGROUND_NAME, error);
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if (!background)
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return FALSE; /* Note that "error" was filled with a GError */
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back_width = gdk_pixbuf_get_width (background);
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back_height = gdk_pixbuf_get_height (background);
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for (i = 0; i < N_IMAGES; i++)
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{
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images[i] = gdk_pixbuf_new_from_resource (image_names[i], error);
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if (!images[i])
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return FALSE; /* Note that "error" was filled with a GError */
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}
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return TRUE;
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}
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/* Expose callback for the drawing area */
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static void
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draw_func (GtkDrawingArea *area,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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{
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gdk_cairo_set_source_pixbuf (cr, frame, 0, 0);
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cairo_paint (cr);
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}
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#define CYCLE_TIME 3000000 /* 3 seconds */
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static gint64 start_time;
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/* Handler to regenerate the frame */
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static gboolean
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on_tick (GtkWidget *widget,
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GdkFrameClock *frame_clock,
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gpointer data)
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{
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gint64 current_time;
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double f;
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int i;
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double xmid, ymid;
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double radius;
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gdk_pixbuf_copy_area (background, 0, 0, back_width, back_height,
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frame, 0, 0);
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if (start_time == 0)
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start_time = gdk_frame_clock_get_frame_time (frame_clock);
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current_time = gdk_frame_clock_get_frame_time (frame_clock);
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f = ((current_time - start_time) % CYCLE_TIME) / (double)CYCLE_TIME;
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xmid = back_width / 2.0;
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ymid = back_height / 2.0;
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radius = MIN (xmid, ymid) / 2.0;
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for (i = 0; i < N_IMAGES; i++)
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{
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double ang;
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int xpos, ypos;
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int iw, ih;
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double r;
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GdkRectangle r1, r2, dest;
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double k;
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ang = 2.0 * G_PI * (double) i / N_IMAGES - f * 2.0 * G_PI;
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iw = gdk_pixbuf_get_width (images[i]);
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ih = gdk_pixbuf_get_height (images[i]);
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r = radius + (radius / 3.0) * sin (f * 2.0 * G_PI);
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xpos = floor (xmid + r * cos (ang) - iw / 2.0 + 0.5);
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ypos = floor (ymid + r * sin (ang) - ih / 2.0 + 0.5);
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k = (i & 1) ? sin (f * 2.0 * G_PI) : cos (f * 2.0 * G_PI);
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k = 2.0 * k * k;
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k = MAX (0.25, k);
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r1.x = xpos;
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r1.y = ypos;
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r1.width = iw * k;
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r1.height = ih * k;
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r2.x = 0;
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r2.y = 0;
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r2.width = back_width;
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r2.height = back_height;
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if (gdk_rectangle_intersect (&r1, &r2, &dest))
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gdk_pixbuf_composite (images[i],
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frame,
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dest.x, dest.y,
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dest.width, dest.height,
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xpos, ypos,
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k, k,
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GDK_INTERP_NEAREST,
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((i & 1)
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? MAX (127, fabs (255 * sin (f * 2.0 * G_PI)))
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: MAX (127, fabs (255 * cos (f * 2.0 * G_PI)))));
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}
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gtk_widget_queue_draw (da);
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return G_SOURCE_CONTINUE;
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}
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GtkWidget *
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do_pixbufs (GtkWidget *do_widget)
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{
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if (!window)
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{
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GError *error;
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window = gtk_window_new ();
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gtk_window_set_display (GTK_WINDOW (window),
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gtk_widget_get_display (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Pixbufs");
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gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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error = NULL;
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if (!load_pixbufs (&error))
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{
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GtkWidget *dialog;
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dialog = gtk_message_dialog_new (GTK_WINDOW (window),
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GTK_DIALOG_DESTROY_WITH_PARENT,
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GTK_MESSAGE_ERROR,
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GTK_BUTTONS_CLOSE,
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"Failed to load an image: %s",
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error->message);
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g_error_free (error);
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g_signal_connect (dialog, "response",
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G_CALLBACK (gtk_window_destroy), NULL);
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gtk_widget_show (dialog);
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}
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else
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{
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frame = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, back_width, back_height);
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da = gtk_drawing_area_new ();
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gtk_drawing_area_set_content_width (GTK_DRAWING_AREA (da), back_width);
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gtk_drawing_area_set_content_height (GTK_DRAWING_AREA (da), back_height);
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_func, NULL, NULL);
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gtk_window_set_child (GTK_WINDOW (window), da);
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gtk_widget_add_tick_callback (da, on_tick, NULL, NULL);
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}
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show (window);
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else
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{
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gtk_window_destroy (GTK_WINDOW (window));
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g_object_unref (frame);
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}
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return window;
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}
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