libsysprof-gtk: start on new axis/series design

This will mean we move series work from libsysprof-analyze into
libsysprof-gtk so we get access to things like GtkExpression.

src/libsysprof-gtk/sysprof-value-axis.c

@@ -0,0 +1,212 @@
+/* sysprof-value-axis.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-value-axis.h"
+
+enum {
+  PROP_0,
+  PROP_MIN_VALUE,
+  PROP_MAX_VALUE,
+  N_PROPS
+};
+
+G_DEFINE_TYPE (SysprofValueAxis, sysprof_value_axis, SYSPROF_TYPE_AXIS)
+
+static GParamSpec *properties [N_PROPS];
+
+static inline double
+get_as_double (const GValue *value)
+{
+  if (G_VALUE_HOLDS_DOUBLE (value))
+    return g_value_get_double (value);
+
+  if (G_VALUE_HOLDS_FLOAT (value))
+    return g_value_get_float (value);
+
+  if (G_VALUE_HOLDS_INT64 (value))
+    return g_value_get_int64 (value);
+
+  if (G_VALUE_HOLDS_UINT64 (value))
+    return g_value_get_uint64 (value);
+
+  if (G_VALUE_HOLDS_INT (value))
+    return g_value_get_int (value);
+
+  if (G_VALUE_HOLDS_UINT (value))
+    return g_value_get_uint (value);
+
+  if (g_value_type_transformable (G_VALUE_TYPE (value), G_TYPE_DOUBLE))
+    {
+      GValue dst = G_VALUE_INIT;
+
+      g_value_init (&dst, G_TYPE_DOUBLE);
+      g_value_transform (value, &dst);
+      g_value_unset (&dst);
+
+      return g_value_get_double (&dst);
+    }
+
+  return -INFINITY;
+}
+
+static void
+sysprof_value_axis_real_get_min_value (SysprofAxis *axis,
+                                       GValue      *value)
+{
+  SysprofValueAxis *self = SYSPROF_VALUE_AXIS (axis);
+
+  g_value_init (value, G_TYPE_DOUBLE);
+  g_value_set_double (value, MIN (self->min_value, self->max_value));
+}
+
+static double
+sysprof_value_axis_normalize (SysprofAxis   *axis,
+                             const GValue *value)
+{
+  SysprofValueAxis *self = (SysprofValueAxis *)axis;
+  double v = get_as_double (value);
+  double r = (v - self->min_value) / self->distance;
+
+  return r;
+}
+
+static void
+sysprof_value_axis_get_property (GObject    *object,
+                                guint       prop_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  SysprofValueAxis *self = SYSPROF_VALUE_AXIS (object);
+
+  switch (prop_id)
+    {
+    case PROP_MIN_VALUE:
+      g_value_set_double (value, sysprof_value_axis_get_min_value (self));
+      break;
+
+    case PROP_MAX_VALUE:
+      g_value_set_double (value, sysprof_value_axis_get_max_value (self));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_value_axis_set_property (GObject      *object,
+                                guint         prop_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  SysprofValueAxis *self = SYSPROF_VALUE_AXIS (object);
+
+  switch (prop_id)
+    {
+    case PROP_MIN_VALUE:
+      sysprof_value_axis_set_min_value (self, g_value_get_double (value));
+      break;
+
+    case PROP_MAX_VALUE:
+      sysprof_value_axis_set_max_value (self, g_value_get_double (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+    }
+}
+
+static void
+sysprof_value_axis_class_init (SysprofValueAxisClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  SysprofAxisClass *axis_class = SYSPROF_AXIS_CLASS (klass);
+
+  object_class->get_property = sysprof_value_axis_get_property;
+  object_class->set_property = sysprof_value_axis_set_property;
+
+  axis_class->get_min_value = sysprof_value_axis_real_get_min_value;
+  axis_class->normalize = sysprof_value_axis_normalize;
+
+  properties[PROP_MIN_VALUE] =
+    g_param_spec_double ("min-value", NULL, NULL,
+                         -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+                         (G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
+
+  properties[PROP_MAX_VALUE] =
+    g_param_spec_double ("max-value", NULL, NULL,
+                         -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+                         (G_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_properties (object_class, N_PROPS, properties);
+}
+
+static void
+sysprof_value_axis_init (SysprofValueAxis *self)
+{
+}
+
+double
+sysprof_value_axis_get_min_value (SysprofValueAxis *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_VALUE_AXIS (self), .0);
+
+  return self->min_value;
+}
+
+void
+sysprof_value_axis_set_min_value (SysprofValueAxis *self,
+                                 double           min_value)
+{
+  g_return_if_fail (SYSPROF_IS_VALUE_AXIS (self));
+
+  if (min_value != self->min_value)
+    {
+      self->min_value = min_value;
+      self->distance = self->max_value - self->min_value;
+      g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MIN_VALUE]);
+      _sysprof_axis_emit_range_changed (SYSPROF_AXIS (self));
+    }
+}
+
+double
+sysprof_value_axis_get_max_value (SysprofValueAxis *self)
+{
+  g_return_val_if_fail (SYSPROF_IS_VALUE_AXIS (self), .0);
+
+  return self->max_value;
+}
+
+void
+sysprof_value_axis_set_max_value (SysprofValueAxis *self,
+                                 double           max_value)
+{
+  g_return_if_fail (SYSPROF_IS_VALUE_AXIS (self));
+
+  if (max_value != self->max_value)
+    {
+      self->max_value = max_value;
+      self->distance = self->max_value - self->min_value;
+      g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MAX_VALUE]);
+      _sysprof_axis_emit_range_changed (SYSPROF_AXIS (self));
+    }
+}