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Diffstat (limited to 'gui/egg-histogram-view.c')
| -rw-r--r-- | gui/egg-histogram-view.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/gui/egg-histogram-view.c b/gui/egg-histogram-view.c new file mode 100644 index 0000000..812af7a --- /dev/null +++ b/gui/egg-histogram-view.c @@ -0,0 +1,524 @@ +/* Copyright (C) 2011, 2012 Matthias Vogelgesang <matthias.vogelgesang@kit.edu> + (Karlsruhe Institute of Technology) + + This library is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by the + Free Software Foundation; either version 2.1 of the License, or (at your + option) any later version. + + This library 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 Lesser General Public License for more + details. + + You should have received a copy of the GNU Lesser General Public License along + with this library; if not, write to the Free Software Foundation, Inc., 51 + Franklin St, Fifth Floor, Boston, MA 02110, USA */ + +#include <math.h> +#include "egg-histogram-view.h" + +G_DEFINE_TYPE (EggHistogramView, egg_histogram_view, GTK_TYPE_DRAWING_AREA) + +#define EGG_HISTOGRAM_VIEW_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), EGG_TYPE_HISTOGRAM_VIEW, EggHistogramViewPrivate)) + +#define MIN_WIDTH 128 +#define MIN_HEIGHT 128 +#define BORDER 2 + +struct _EggHistogramViewPrivate +{ + GdkCursorType cursor_type; + gboolean grabbing; + + /* This could be moved into a real histogram class */ + guint n_bins; + gint *bins; + gint *grabbed; + gint min_border; /* threshold set in screen units */ + gint max_border; + + gdouble min_value; /* lowest value of the first bin */ + gdouble max_value; /* highest value of the last bin */ + gdouble range; + + gpointer data; + gint n_elements; + gint n_bits; +}; + +enum +{ + PROP_0, + PROP_MINIMUM_BIN_VALUE, + PROP_MAXIMUM_BIN_VALUE, + N_PROPERTIES +}; + +enum +{ + CHANGED, + LAST_SIGNAL +}; + +static GParamSpec *egg_histogram_view_properties[N_PROPERTIES] = { NULL, }; + +static guint egg_histogram_view_signals[LAST_SIGNAL] = { 0 }; + + +GtkWidget * +egg_histogram_view_new (void) +{ + EggHistogramView *view; + + view = EGG_HISTOGRAM_VIEW (g_object_new (EGG_TYPE_HISTOGRAM_VIEW, NULL)); + return GTK_WIDGET (view); +} + +void +egg_histogram_view_set_data (EggHistogramView *view, + gpointer data, + guint n_elements, + guint n_bits, + guint n_bins) +{ + EggHistogramViewPrivate *priv; + + g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (view)); + priv = view->priv; + + if (priv->bins != NULL) + g_free (priv->bins); + + priv->data = data; + priv->bins = g_malloc0 (n_bins * sizeof (guint)); + priv->n_bins = n_bins; + priv->n_bits = n_bits; + priv->n_elements = n_elements; + + priv->min_value = 0.0; + priv->max_value = (gint) pow(2, n_bits) - 1; + + priv->min_border = 0; + priv->max_border = 256; + priv->range = priv->max_value - priv->min_value; +} + +void +egg_histogram_get_visible_range (EggHistogramView *view, gdouble *min, gdouble *max) +{ + EggHistogramViewPrivate *priv; + GtkAllocation allocation; + gdouble width; + + g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (view)); + + gtk_widget_get_allocation (GTK_WIDGET (view), &allocation); + width = (gdouble) allocation.width - 2 * BORDER; + priv = view->priv; + + *min = (priv->min_border - 2) / width * priv->range; + *max = (priv->max_border - 2) / width * priv->range; +} + +static void +set_max_border (EggHistogramView *view) +{ + GtkAllocation allocation; + + g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (view)); + gtk_widget_get_allocation (GTK_WIDGET (view), &allocation); + view->priv->max_border = allocation.width - 2 * BORDER; +} + +static void +compute_histogram (EggHistogramViewPrivate *priv) +{ + guint n_bins = priv->n_bins - 1; + + for (guint i = 0; i < priv->n_bins; i++) + priv->bins[i] = 0; + + if (priv->n_bits == 8) { + guint8 *data = (guint8 *) priv->data; + + for (guint i = 0; i < priv->n_elements; i++) { + guint8 v = data[i]; + + if (v >= priv->min_value && v <= priv->max_value) { + guint index = (guint) round (((gdouble) v) / priv->max_value * n_bins); + priv->bins[index]++; + } + } + } + else { + guint16 *data = (guint16 *) priv->data; + + for (guint i = 0; i < priv->n_elements; i++) { + guint16 v = data[i]; + + if (v >= priv->min_value && v <= priv->max_value) { + guint index = (guint) floor (((gdouble ) v) / priv->max_value * n_bins); + priv->bins[index]++; + } + } + } +} + +static void +set_cursor_type (EggHistogramView *view, GdkCursorType cursor_type) +{ + if (cursor_type != view->priv->cursor_type) { + GdkCursor *cursor = gdk_cursor_new (cursor_type); + + gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET(view)), cursor); + gdk_cursor_unref (cursor); + view->priv->cursor_type = cursor_type; + } +} + +static void +egg_histogram_view_size_request (GtkWidget *widget, + GtkRequisition *requisition) +{ + requisition->width = MIN_WIDTH; + requisition->height = MIN_HEIGHT; +} + +static void +draw_bins (EggHistogramViewPrivate *priv, + cairo_t *cr, + gint width, + gint height) +{ + gdouble skip = ((gdouble) width) / priv->n_bins; + gdouble x = BORDER; + gdouble ys = height + BORDER - 1; + gint max_value = 0; + + for (guint i = 0; i < priv->n_bins; i++) { + if (priv->bins[i] > max_value) + max_value = priv->bins[i]; + } + + if (max_value == 0) + return; + + for (guint i = 0; i < priv->n_bins && x < (width - BORDER); i++, x += skip) { + if (priv->bins[i] == 0) + continue; + + gint y = (gint) ((height - 2) * priv->bins[i]) / max_value; + cairo_move_to (cr, round (x), ys); + cairo_line_to (cr, round (x), ys - y); + cairo_stroke (cr); + } +} + +static gboolean +egg_histogram_view_expose (GtkWidget *widget, + GdkEventExpose *event) +{ + EggHistogramViewPrivate *priv; + GtkAllocation allocation; + GtkStyle *style; + cairo_t *cr; + gint width, height; + + priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (widget); + cr = gdk_cairo_create (gtk_widget_get_window (widget)); + + gdk_cairo_region (cr, event->region); + cairo_clip (cr); + + style = gtk_widget_get_style (widget); + gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]); + cairo_paint (cr); + + /* Draw the background */ + gdk_cairo_set_source_color (cr, &style->base[GTK_STATE_NORMAL]); + cairo_paint (cr); + + gtk_widget_get_allocation (widget, &allocation); + width = allocation.width - 2 * BORDER; + height = allocation.height - 2 * BORDER; + + gdk_cairo_set_source_color (cr, &style->dark[GTK_STATE_NORMAL]); + cairo_set_line_width (cr, 1.0); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE); + cairo_translate (cr, 0.5, 0.5); + cairo_rectangle (cr, BORDER, BORDER, width - 1, height - 1); + cairo_stroke (cr); + + if (priv->bins == NULL) + goto cleanup; + + compute_histogram (priv); + + /* Draw border areas */ + gdk_cairo_set_source_color (cr, &style->dark[GTK_STATE_NORMAL]); + + cairo_rectangle (cr, BORDER, BORDER, priv->min_border + 0.5, height - 1); + cairo_fill (cr); + + cairo_rectangle (cr, priv->max_border + 0.5, BORDER, width - priv->max_border + 0.5, height - 1); + cairo_fill (cr); + + /* Draw spikes */ + gdk_cairo_set_source_color (cr, &style->black); + draw_bins (priv, cr, width, height); + +cleanup: + cairo_destroy (cr); + return FALSE; +} + +static void +egg_histogram_view_finalize (GObject *object) +{ + EggHistogramViewPrivate *priv; + + priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (object); + + if (priv->bins) + g_free (priv->bins); + + G_OBJECT_CLASS (egg_histogram_view_parent_class)->finalize (object); +} + +static void +egg_histogram_view_dispose (GObject *object) +{ + G_OBJECT_CLASS (egg_histogram_view_parent_class)->dispose (object); +} + +static void +egg_histogram_view_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + EggHistogramViewPrivate *priv; + + g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (object)); + priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (object); + + switch (property_id) { + case PROP_MINIMUM_BIN_VALUE: + { + gdouble v = g_value_get_double (value); + + if (v > priv->max_value) + g_warning ("Minimum value `%f' larger than maximum value `%f'", + v, priv->max_value); + else { + priv->min_value = v; + priv->range = priv->max_value - v; + priv->min_border = 0; + } + } + break; + + case PROP_MAXIMUM_BIN_VALUE: + { + gdouble v = g_value_get_double (value); + + if (v < priv->min_value) + g_warning ("Maximum value `%f' larger than minimum value `%f'", + v, priv->min_value); + else { + priv->max_value = v; + priv->range = v - priv->min_value; + set_max_border (EGG_HISTOGRAM_VIEW (object)); + } + } + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + return; + } +} + +static void +egg_histogram_view_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + EggHistogramViewPrivate *priv; + + g_return_if_fail (EGG_IS_HISTOGRAM_VIEW (object)); + priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (object); + + switch (property_id) { + case PROP_MINIMUM_BIN_VALUE: + g_value_set_double (value, priv->min_value); + break; + + case PROP_MAXIMUM_BIN_VALUE: + g_value_set_double (value, priv->max_value); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + return; + } +} + +static gboolean +is_on_border (EggHistogramViewPrivate *priv, + gint x) +{ + gint d1 = (priv->min_border + BORDER) - x; + gint d2 = (priv->max_border + BORDER) - x; + return ABS (d1) < 6 || ABS (d2) < 6; +} + +static gint * +get_grabbed_border (EggHistogramViewPrivate *priv, + gint x) +{ + gint d1 = (priv->min_border + BORDER) - x; + gint d2 = (priv->max_border + BORDER) - x; + + if (ABS (d1) < 6) + return &priv->min_border; + else if (ABS (d2) < 6) + return &priv->max_border; + + return NULL; +} + +static gboolean +egg_histogram_view_motion_notify (GtkWidget *widget, + GdkEventMotion *event) +{ + EggHistogramView *view; + EggHistogramViewPrivate *priv; + + view = EGG_HISTOGRAM_VIEW (widget); + priv = view->priv; + + if (priv->grabbing) { + GtkAllocation allocation; + + gtk_widget_get_allocation (widget, &allocation); + + if ((event->x + BORDER > 0) && (event->x + BORDER < allocation.width)) { + *priv->grabbed = event->x; + gtk_widget_queue_draw (widget); + } + } + else { + if (is_on_border (priv, event->x)) + set_cursor_type (view, GDK_FLEUR); + else + set_cursor_type (view, GDK_ARROW); + } + + return TRUE; +} + +static gboolean +egg_histogram_view_button_release (GtkWidget *widget, + GdkEventButton *event) +{ + EggHistogramView *view; + + view = EGG_HISTOGRAM_VIEW (widget); + set_cursor_type (view, GDK_ARROW); + view->priv->grabbing = FALSE; + g_signal_emit (widget, egg_histogram_view_signals[CHANGED], 0); + + return TRUE; +} + +static gboolean +egg_histogram_view_button_press (GtkWidget *widget, + GdkEventButton *event) +{ + EggHistogramView *view; + EggHistogramViewPrivate *priv; + + view = EGG_HISTOGRAM_VIEW (widget); + priv = view->priv; + + if (is_on_border (priv, event->x)) { + priv->grabbing = TRUE; + priv->grabbed = get_grabbed_border (priv, event->x); + set_cursor_type (view, GDK_FLEUR); + } + + return TRUE; +} + +static void +egg_histogram_view_class_init (EggHistogramViewClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass); + + object_class->set_property = egg_histogram_view_set_property; + object_class->get_property = egg_histogram_view_get_property; + object_class->dispose = egg_histogram_view_dispose; + object_class->finalize = egg_histogram_view_finalize; + + widget_class->size_request = egg_histogram_view_size_request; + widget_class->expose_event = egg_histogram_view_expose; + widget_class->button_press_event = egg_histogram_view_button_press; + widget_class->button_release_event = egg_histogram_view_button_release; + widget_class->motion_notify_event = egg_histogram_view_motion_notify; + + egg_histogram_view_properties[PROP_MINIMUM_BIN_VALUE] = + g_param_spec_double ("minimum-bin-value", + "Smallest possible bin value", + "Smallest possible bin value, everything below is discarded.", + 0.0, G_MAXDOUBLE, 0.0, + G_PARAM_READWRITE); + + egg_histogram_view_properties[PROP_MAXIMUM_BIN_VALUE] = + g_param_spec_double ("maximum-bin-value", + "Largest possible bin value", + "Largest possible bin value, everything above is discarded.", + 0.0, G_MAXDOUBLE, 256.0, + G_PARAM_READWRITE); + + g_object_class_install_property (object_class, PROP_MINIMUM_BIN_VALUE, egg_histogram_view_properties[PROP_MINIMUM_BIN_VALUE]); + g_object_class_install_property (object_class, PROP_MAXIMUM_BIN_VALUE, egg_histogram_view_properties[PROP_MAXIMUM_BIN_VALUE]); + + egg_histogram_view_signals[CHANGED] = + g_signal_new ("changed", + G_OBJECT_CLASS_TYPE (klass), + G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE, + G_STRUCT_OFFSET (EggHistogramViewClass, changed), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, 0); + + g_type_class_add_private (klass, sizeof (EggHistogramViewPrivate)); +} + +static void +egg_histogram_view_init (EggHistogramView *view) +{ + EggHistogramViewPrivate *priv; + + view->priv = priv = EGG_HISTOGRAM_VIEW_GET_PRIVATE (view); + + priv->bins = NULL; + priv->data = NULL; + priv->n_bins = 0; + priv->n_elements = 0; + priv->min_value = priv->min_border = 0; + priv->max_value = priv->max_border = 256; + + priv->cursor_type = GDK_ARROW; + priv->grabbing = FALSE; + + gtk_widget_add_events (GTK_WIDGET (view), + GDK_BUTTON_PRESS_MASK | + GDK_BUTTON_RELEASE_MASK | + GDK_BUTTON1_MOTION_MASK | + GDK_POINTER_MOTION_MASK); +} |