gboolean update_gauge(gpointer data)
{
static gfloat lower = 0.0;
static gfloat upper = 100.0;
gfloat cur_val = 0.0;
gfloat interval = 0.0;
static gboolean rising = TRUE;
GtkWidget * gauge = data;
interval = (upper-lower)/100.0;
/*mtx_gauge_face_get_attribute(MTX_PIE_GAUGE(gauge), LBOUND, &lower);*/
/*mtx_gauge_face_get_attribute(MTX_PIE_GAUGE(gauge), UBOUND, &upper);*/
cur_val = mtx_pie_gauge_get_value(MTX_PIE_GAUGE (gauge));
if (cur_val >= upper)
rising = FALSE;
if (cur_val <= lower)
rising = TRUE;
if (rising)
cur_val+=interval;
else
cur_val-=interval;
mtx_pie_gauge_set_value (MTX_PIE_GAUGE (gauge),cur_val);
return TRUE;
}
/*!
\brief handles exposure events when the screen is covered and then
exposed. Works by copying from a backing pixmap to screen,
\param widget (GtkWidget *) pointer to the gauge object
\param event (GdkEventExpose *) pointer to GDK event datastructure that
encodes important info like window dimensions and depth.
*/
gboolean mtx_pie_gauge_expose (GtkWidget *widget, GdkEventExpose *event)
{
MtxPieGauge * gauge = MTX_PIE_GAUGE(widget);
MtxPieGaugePrivate *priv = MTX_PIE_GAUGE_GET_PRIVATE(gauge);
gdk_draw_drawable(widget->window,
widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
priv->pixmap,
event->area.x, event->area.y,
event->area.x, event->area.y,
event->area.width, event->area.height);
return FALSE;
}
/*!
\brief handles configure events whe nthe gauge gets created or resized.
Takes care of creating/destroying graphics contexts, backing pixmaps (two
levels are used to split the rendering for speed reasons) colormaps are
also created here as well
\param widget (GtkWidget *) pointer to the gauge object
\param event (GdkEventConfigure *) pointer to GDK event datastructure that
encodes important info like window dimensions and depth.
*/
gboolean mtx_pie_gauge_configure (GtkWidget *widget, GdkEventConfigure *event)
{
MtxPieGauge * gauge = MTX_PIE_GAUGE(widget);
MtxPieGaugePrivate *priv = MTX_PIE_GAUGE_GET_PRIVATE(gauge);
priv->w = widget->allocation.width;
priv->h = widget->allocation.height;
if (priv->gc)
g_object_unref(priv->gc);
/* Backing pixmap (copy of window) */
if (priv->pixmap)
g_object_unref(priv->pixmap);
priv->pixmap=gdk_pixmap_new(widget->window,
priv->w,priv->h,
gtk_widget_get_visual(widget)->depth);
gdk_draw_rectangle(priv->pixmap,
widget->style->black_gc,
TRUE, 0,0,
priv->w,priv->h);
/* Static Background pixmap */
if (priv->bg_pixmap)
g_object_unref(priv->bg_pixmap);
priv->bg_pixmap=gdk_pixmap_new(widget->window,
priv->w,priv->h,
gtk_widget_get_visual(widget)->depth);
gdk_draw_rectangle(priv->bg_pixmap,
widget->style->black_gc,
TRUE, 0,0,
priv->w,priv->h);
gdk_window_set_back_pixmap(widget->window,priv->pixmap,0);
priv->gc = gdk_gc_new(priv->bg_pixmap);
gdk_gc_set_colormap(priv->gc,priv->colormap);
if (priv->font_options)
cairo_font_options_destroy(priv->font_options);
priv->font_options = cairo_font_options_create();
cairo_font_options_set_antialias(priv->font_options,
CAIRO_ANTIALIAS_GRAY);
generate_pie_gauge_background(gauge);
update_pie_gauge_position(gauge);
return TRUE;
}
