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visualizer-ticks: adjust ticks for capture epoch

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We need to take into account the real start of the capture to
land the ticks in the right position. Add "epoch" concept
to SpVisualizerTicks for just this purpose.
This commit is contained in:
Christian Hergert
2016-09-30 13:21:17 -07:00
parent 54116ba765
commit c116120563
3 changed files with 47 additions and 1 deletions
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43
lib/sp-visualizer-ticks.c
View File

@ -27,6 +27,7 @@ struct _SpVisualizerTicks
{
GtkDrawingArea parent_instance;
gint64 epoch;
gint64 begin_time;
gint64 end_time;
};
@ -70,6 +71,7 @@ draw_ticks (SpVisualizerTicks *self,
{
gdouble half;
gdouble space;
gdouble offset;
gint64 timespan;
g_assert (SP_IS_VISUALIZER_TICKS (self));
@ -82,7 +84,13 @@ draw_ticks (SpVisualizerTicks *self,
space = (gdouble)area->width / (gdouble)timespan * (gdouble)tick_sizing[ticks].span;
half = tick_sizing[ticks].width / 2.0;
for (gdouble x = 0; x < area->width; x += space)
/* Take our epoch into account to calculate the offset of the
* first tick, which might not align perfectly when the beginning
* of the visible area.
*/
offset = ((self->begin_time - self->epoch) % tick_sizing[ticks].span) / (gdouble)tick_sizing[ticks].span * space;
for (gdouble x = -offset; x < area->width; x += space)
{
cairo_move_to (cr, (gint)x - .5 - (gint)half, 0);
cairo_line_to (cr, (gint)x - .5 - (gint)half, tick_sizing[ticks].height);
@ -208,3 +216,36 @@ sp_visualizer_ticks_set_time_range (SpVisualizerTicks *self,
gtk_widget_queue_draw (GTK_WIDGET (self));
}
gint64
sp_visualizer_ticks_get_epoch (SpVisualizerTicks *self)
{
g_return_val_if_fail (SP_IS_VISUALIZER_TICKS (self), 0);
return self->epoch;
}
/*
* Sets the epoch for the visualizer ticks.
*
* The epoch is the "real" starting time of the capture, where as the
* sp_visualizer_ticks_set_time_range() function sets the visible range
* of the capture.
*
* This is used to calculate the offset of the beginning of the capture
* from begin_time so that the ticks appear in the proper location.
*
* This function should only need to be called when the reader is changed.
*/
void
sp_visualizer_ticks_set_epoch (SpVisualizerTicks *self,
gint64 epoch)
{
g_return_if_fail (SP_IS_VISUALIZER_TICKS (self));
if (self->epoch != epoch)
{
self->epoch = epoch;
gtk_widget_queue_draw (GTK_WIDGET (self));
}
}

3
lib/sp-visualizer-ticks.h
View File

@ -28,6 +28,9 @@ G_BEGIN_DECLS
G_DECLARE_FINAL_TYPE (SpVisualizerTicks, sp_visualizer_ticks, SP, VISUALIZER_TICKS, GtkDrawingArea)
GtkWidget *sp_visualizer_ticks_new (void);
void sp_visualizer_ticks_set_epoch (SpVisualizerTicks *self,
gint64 epoch);
gint64 sp_visualizer_ticks_get_epoch (SpVisualizerTicks *self);
void sp_visualizer_ticks_get_time_range (SpVisualizerTicks *self,
gint64 *begin_time,
gint64 *end_time);

2
lib/sp-visualizer-view.c
View File

@ -328,6 +328,8 @@ sp_visualizer_view_set_reader (SpVisualizerView *self,
begin_time = sp_capture_reader_get_start_time (reader);
end_time = sp_capture_reader_get_end_time (reader);
sp_visualizer_ticks_set_epoch (priv->ticks, begin_time);
g_object_set (priv->scroll_adjustment,
"lower", (gdouble)begin_time,
"upper", (gdouble)end_time,