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libsysprof-gtk: add lookup item support for line points

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This commit is contained in:
Christian Hergert
2023-07-05 17:54:22 -07:00
parent 1ac95756af
commit 3ebea4823e
1 changed files with 57 additions and 0 deletions
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57
src/libsysprof-gtk/sysprof-line-layer.c
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@ -268,6 +268,62 @@ sysprof_line_layer_snapshot_motion (SysprofChartLayer *layer,
}
}
static gpointer
sysprof_line_layer_lookup_item (SysprofChartLayer *layer,
double x,
double y)
{
SysprofLineLayer *self = (SysprofLineLayer *)layer;
SysprofXYSeries *series;
const double *x_values;
const double *y_values;
GListModel *model;
double best_distance = G_MAXDOUBLE;
guint best_index = GTK_INVALID_LIST_POSITION;
guint n_values;
int width;
int height;
g_assert (SYSPROF_IS_LINE_LAYER (self));
width = gtk_widget_get_width (GTK_WIDGET (self));
height = gtk_widget_get_height (GTK_WIDGET (self));
_sysprof_xy_layer_get_xy (SYSPROF_XY_LAYER (self), &x_values, &y_values, &n_values);
if (width == 0 || height == 0 || n_values == 0)
return NULL;
series = sysprof_xy_layer_get_series (SYSPROF_XY_LAYER (self));
model = sysprof_series_get_model (SYSPROF_SERIES (series));
for (guint i = 0; i < n_values; i++)
{
double x2 = floor (x_values[i] * width);
double y2 = height - floor (y_values[i] * height);
double distance;
if (x2 + NEAR_DISTANCE < x)
continue;
if (x2 > x + NEAR_DISTANCE)
break;
distance = sqrt (pow (x2 - x, 2) + pow (y2 - y, 2));
if (distance < best_distance)
{
best_distance = distance;
best_index = i;
}
}
if (best_index != GTK_INVALID_LIST_POSITION)
return g_list_model_get_item (model, best_index);
return NULL;
}
static void
sysprof_line_layer_get_property (GObject *object,
guint prop_id,
@ -351,6 +407,7 @@ sysprof_line_layer_class_init (SysprofLineLayerClass *klass)
widget_class->snapshot = sysprof_line_layer_snapshot;
chart_layer_class->snapshot_motion = sysprof_line_layer_snapshot_motion;
chart_layer_class->lookup_item = sysprof_line_layer_lookup_item;
properties [PROP_ANTIALIAS] =
g_param_spec_boolean ("antialias", NULL, NULL,