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libsysprof-gtk: basic hover support for line layer

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This commit is contained in:
Christian Hergert
2023-06-28 11:16:59 -07:00
parent c1375fa10f
commit 71c0c20834
1 changed files with 92 additions and 0 deletions
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92
src/libsysprof-gtk/sysprof-line-layer.c
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@ -21,10 +21,14 @@
#include "config.h"
#include <math.h>
#include "sysprof-chart-layer-private.h"
#include "sysprof-line-layer.h"
#include "sysprof-xy-layer-private.h"
#define NEAR_DISTANCE 50
struct _SysprofLineLayer
{
SysprofXYLayer parent_instance;
@ -174,6 +178,91 @@ sysprof_line_layer_snapshot (GtkWidget *widget,
cairo_destroy (cr);
}
static void
sysprof_line_layer_snapshot_motion (SysprofChartLayer *layer,
GtkSnapshot *snapshot,
double x,
double y)
{
SysprofLineLayer *self = (SysprofLineLayer *)layer;
const GdkRGBA *color;
const float *x_values;
const float *y_values;
float best_distance = G_MAXFLOAT;
guint best_index = GTK_INVALID_LIST_POSITION;
float best_x = 0;
float best_y = 0;
guint n_values;
int width;
int height;
g_assert (SYSPROF_IS_LINE_LAYER (self));
g_assert (GTK_IS_SNAPSHOT (snapshot));
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;
if (self->color_set)
color = &self->color;
else
color = _sysprof_chart_layer_get_accent_bg_color ();
if (color->alpha == .0)
return;
for (guint i = 0; i < n_values; i++)
{
float x2 = floor (x_values[i] * width);
float y2 = height - floor (y_values[i] * height);
float distance;
if (x2 + NEAR_DISTANCE < x)
continue;
if (x2 > x + NEAR_DISTANCE)
break;
distance = sqrtf (powf (x2 - x, 2) + powf (y2 - y, 2));
if (distance < best_distance)
{
best_distance = distance;
best_index = i;
best_x = x2;
best_y = y2;
}
}
if (best_index != GTK_INVALID_LIST_POSITION)
{
GdkRGBA fill_color;
const int size = 6;
const int half_size = size / 2;
graphene_rect_t area = GRAPHENE_RECT_INIT (best_x - half_size,
best_y - half_size,
size, size);
cairo_t *cr = gtk_snapshot_append_cairo (snapshot, &area);
cairo_rectangle (cr, area.origin.x, area.origin.y, area.size.width, area.size.height);
fill_color = *color;
fill_color.alpha *= .75;
gdk_cairo_set_source_rgba (cr, &fill_color);
cairo_fill_preserve (cr);
gdk_cairo_set_source_rgba (cr, color);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
cairo_destroy (cr);
}
}
static void
sysprof_line_layer_get_property (GObject *object,
guint prop_id,
@ -249,12 +338,15 @@ sysprof_line_layer_class_init (SysprofLineLayerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
SysprofChartLayerClass *chart_layer_class = SYSPROF_CHART_LAYER_CLASS (klass);
object_class->get_property = sysprof_line_layer_get_property;
object_class->set_property = sysprof_line_layer_set_property;
widget_class->snapshot = sysprof_line_layer_snapshot;
chart_layer_class->snapshot_motion = sysprof_line_layer_snapshot_motion;
properties[PROP_COLOR] =
g_param_spec_boxed ("color", NULL, NULL,
GDK_TYPE_RGBA,