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gimp/libgimpwidgets/gimpruler.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* 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 3 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, see
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "gimpwidgetstypes.h"
#include "gimpruler.h"
/**
* SECTION: gimpruler
* @title: GimpRuler
* @short_description: A ruler widget with configurable unit and orientation.
*
* A ruler widget with configurable unit and orientation.
**/
#define DEFAULT_RULER_FONT_SCALE PANGO_SCALE_SMALL
#define MINIMUM_INCR 5
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_UNIT,
PROP_LOWER,
PROP_UPPER,
PROP_POSITION,
PROP_MAX_SIZE
};
/* All distances below are in 1/72nd's of an inch. (According to
* Adobe that's a point, but points are really 1/72.27 in.)
*/
typedef struct
{
GtkOrientation orientation;
GimpUnit unit;
gdouble lower;
gdouble upper;
gdouble position;
gdouble max_size;
GdkPixmap *backing_store;
GdkGC *non_gr_exp_gc;
PangoLayout *layout;
gdouble font_scale;
gint xsrc;
gint ysrc;
} GimpRulerPrivate;
static const struct
{
const gdouble ruler_scale[16];
const gint subdivide[5];
} ruler_metric =
{
{ 1, 2, 5, 10, 25, 50, 100, 250, 500, 1000, 2500, 5000, 10000, 25000, 50000, 100000 },
{ 1, 5, 10, 50, 100 }
};
static void gimp_ruler_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_ruler_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gimp_ruler_realize (GtkWidget *widget);
static void gimp_ruler_unrealize (GtkWidget *widget);
static void gimp_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gimp_ruler_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gimp_ruler_style_set (GtkWidget *widget,
GtkStyle *prev_style);
static gboolean gimp_ruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event);
static gboolean gimp_ruler_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gimp_ruler_draw_ticks (GimpRuler *ruler);
static void gimp_ruler_draw_pos (GimpRuler *ruler);
static void gimp_ruler_make_pixmap (GimpRuler *ruler);
static PangoLayout * gimp_ruler_get_layout (GtkWidget *widget,
const gchar *text);
G_DEFINE_TYPE (GimpRuler, gimp_ruler, GTK_TYPE_WIDGET)
#define GIMP_RULER_GET_PRIVATE(ruler) \
G_TYPE_INSTANCE_GET_PRIVATE (ruler, GIMP_TYPE_RULER, GimpRulerPrivate)
static void
gimp_ruler_class_init (GimpRulerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->set_property = gimp_ruler_set_property;
object_class->get_property = gimp_ruler_get_property;
widget_class->realize = gimp_ruler_realize;
widget_class->unrealize = gimp_ruler_unrealize;
widget_class->size_allocate = gimp_ruler_size_allocate;
widget_class->size_request = gimp_ruler_size_request;
widget_class->style_set = gimp_ruler_style_set;
widget_class->motion_notify_event = gimp_ruler_motion_notify;
widget_class->expose_event = gimp_ruler_expose;
g_type_class_add_private (object_class, sizeof (GimpRulerPrivate));
g_object_class_install_property (object_class,
PROP_ORIENTATION,
g_param_spec_enum ("orientation",
"Orientation",
"The orientation of the ruler",
GTK_TYPE_ORIENTATION,
GTK_ORIENTATION_HORIZONTAL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_LOWER,
gimp_param_spec_unit ("unit",
"Unit",
"Unit of ruler",
TRUE, TRUE,
GIMP_UNIT_PIXEL,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_LOWER,
g_param_spec_double ("lower",
"Lower",
"Lower limit of ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_UPPER,
g_param_spec_double ("upper",
"Upper",
"Upper limit of ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_POSITION,
g_param_spec_double ("position",
"Position",
"Position of mark on the ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_MAX_SIZE,
g_param_spec_double ("max-size",
"Max Size",
"Maximum size of the ruler",
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
GIMP_PARAM_READWRITE));
gtk_widget_class_install_style_property (widget_class,
g_param_spec_double ("font-scale",
NULL, NULL,
0.0,
G_MAXDOUBLE,
DEFAULT_RULER_FONT_SCALE,
GIMP_PARAM_READABLE));
}
static void
gimp_ruler_init (GimpRuler *ruler)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
priv->orientation = GTK_ORIENTATION_HORIZONTAL;
priv->unit = GIMP_PIXELS;
priv->lower = 0;
priv->upper = 0;
priv->position = 0;
priv->max_size = 0;
priv->backing_store = NULL;
priv->non_gr_exp_gc = NULL;
priv->font_scale = DEFAULT_RULER_FONT_SCALE;
}
static void
gimp_ruler_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GimpRuler *ruler = GIMP_RULER (object);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
switch (prop_id)
{
case PROP_ORIENTATION:
priv->orientation = g_value_get_enum (value);
gtk_widget_queue_resize (GTK_WIDGET (ruler));
break;
case PROP_UNIT:
gimp_ruler_set_unit (ruler, g_value_get_int (value));
break;
case PROP_LOWER:
gimp_ruler_set_range (ruler,
g_value_get_double (value),
priv->upper,
priv->max_size);
break;
case PROP_UPPER:
gimp_ruler_set_range (ruler,
priv->lower,
g_value_get_double (value),
priv->max_size);
break;
case PROP_POSITION:
gimp_ruler_set_position (ruler, g_value_get_double (value));
break;
case PROP_MAX_SIZE:
gimp_ruler_set_range (ruler,
priv->lower,
priv->upper,
g_value_get_double (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gimp_ruler_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GimpRuler *ruler = GIMP_RULER (object);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_UNIT:
g_value_set_int (value, priv->unit);
break;
case PROP_LOWER:
g_value_set_double (value, priv->lower);
break;
case PROP_UPPER:
g_value_set_double (value, priv->upper);
break;
case PROP_POSITION:
g_value_set_double (value, priv->position);
break;
case PROP_MAX_SIZE:
g_value_set_double (value, priv->max_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gimp_ruler_new:
* @orientation: the ruler's orientation.
*
* Creates a new ruler.
*
* Return value: a new #GimpRuler widget.
*
* Since: GIMP 2.8
**/
GtkWidget *
gimp_ruler_new (GtkOrientation orientation)
{
return g_object_new (GIMP_TYPE_RULER,
"orientation", orientation,
NULL);
}
/**
* gimp_ruler_set_position:
* @ruler: a #GimpRuler
* @unit: the #GimpUnit to set the ruler to
*
* This sets the unit of the ruler.
*
* Since: GIMP 2.8
*/
void
gimp_ruler_set_unit (GimpRuler *ruler,
GimpUnit unit)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
if (priv->unit != unit)
{
priv->unit = unit;
g_object_notify (G_OBJECT (ruler), "unit");
gtk_widget_queue_draw (GTK_WIDGET (ruler));
}
}
/**
* gimp_ruler_get_unit:
* @ruler: a #GimpRuler
*
* Return value: the unit currently used in the @ruler widget.
*
* Since: GIMP 2.8
**/
GimpUnit
gimp_ruler_get_unit (GimpRuler *ruler)
{
g_return_val_if_fail (GIMP_IS_RULER (ruler), 0);
return GIMP_RULER_GET_PRIVATE (ruler)->unit;
}
/**
* gimp_ruler_set_position:
* @ruler: a #GimpRuler
* @position: the position to set the ruler to
*
* This sets the position of the ruler.
*
* Since: GIMP 2.8
*/
void
gimp_ruler_set_position (GimpRuler *ruler,
gdouble position)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
if (priv->position != position)
{
priv->position = position;
g_object_notify (G_OBJECT (ruler), "position");
gimp_ruler_draw_pos (ruler);
}
}
/**
* gimp_ruler_get_position:
* @ruler: a #GimpRuler
*
* Return value: the current position of the @ruler widget.
*
* Since: GIMP 2.8
**/
gdouble
gimp_ruler_get_position (GimpRuler *ruler)
{
g_return_val_if_fail (GIMP_IS_RULER (ruler), 0.0);
return GIMP_RULER_GET_PRIVATE (ruler)->position;
}
/**
* gimp_ruler_set_range:
* @ruler: a #GimpRuler
* @lower: the lower limit of the ruler
* @upper: the upper limit of the ruler
* @max_size: the maximum size of the ruler used when calculating the space to
* leave for the text
*
* This sets the range of the ruler.
*
* Since: GIMP 2.8
*/
void
gimp_ruler_set_range (GimpRuler *ruler,
gdouble lower,
gdouble upper,
gdouble max_size)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
g_object_freeze_notify (G_OBJECT (ruler));
if (priv->lower != lower)
{
priv->lower = lower;
g_object_notify (G_OBJECT (ruler), "lower");
}
if (priv->upper != upper)
{
priv->upper = upper;
g_object_notify (G_OBJECT (ruler), "upper");
}
if (priv->max_size != max_size)
{
priv->max_size = max_size;
g_object_notify (G_OBJECT (ruler), "max-size");
}
g_object_thaw_notify (G_OBJECT (ruler));
gtk_widget_queue_draw (GTK_WIDGET (ruler));
}
/**
* gimp_ruler_get_range:
* @ruler: a #GimpRuler
* @lower: location to store lower limit of the ruler, or %NULL
* @upper: location to store upper limit of the ruler, or %NULL
* @max_size: location to store the maximum size of the ruler used when
* calculating the space to leave for the text, or %NULL.
*
* Retrieves values indicating the range and current position of a #GimpRuler.
* See gimp_ruler_set_range().
*
* Since: GIMP 2.8
**/
void
gimp_ruler_get_range (GimpRuler *ruler,
gdouble *lower,
gdouble *upper,
gdouble *max_size)
{
GimpRulerPrivate *priv;
g_return_if_fail (GIMP_IS_RULER (ruler));
priv = GIMP_RULER_GET_PRIVATE (ruler);
if (lower)
*lower = priv->lower;
if (upper)
*upper = priv->upper;
if (max_size)
*max_size = priv->max_size;
}
static void
gimp_ruler_realize (GtkWidget *widget)
{
GimpRuler *ruler = GIMP_RULER (widget);
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.event_mask = (gtk_widget_get_events (widget) |
GDK_EXPOSURE_MASK |
GDK_POINTER_MOTION_MASK |
GDK_POINTER_MOTION_HINT_MASK);
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
gtk_widget_set_window (widget,
gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask));
gdk_window_set_user_data (gtk_widget_get_window (widget), ruler);
gtk_widget_style_attach (widget);
gtk_style_set_background (gtk_widget_get_style (widget),
gtk_widget_get_window (widget),
GTK_STATE_ACTIVE);
gimp_ruler_make_pixmap (ruler);
}
static void
gimp_ruler_unrealize (GtkWidget *widget)
{
GimpRuler *ruler = GIMP_RULER (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
if (priv->backing_store)
{
g_object_unref (priv->backing_store);
priv->backing_store = NULL;
}
if (priv->non_gr_exp_gc)
{
g_object_unref (priv->non_gr_exp_gc);
priv->non_gr_exp_gc = NULL;
}
if (priv->layout)
{
g_object_unref (priv->layout);
priv->layout = NULL;
}
GTK_WIDGET_CLASS (gimp_ruler_parent_class)->unrealize (widget);
}
static void
gimp_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpRuler *ruler = GIMP_RULER (widget);
gtk_widget_set_allocation (widget, allocation);
if (gtk_widget_get_realized (widget))
{
gdk_window_move_resize (gtk_widget_get_window (widget),
allocation->x, allocation->y,
allocation->width, allocation->height);
gimp_ruler_make_pixmap (ruler);
}
}
static void
gimp_ruler_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget);
GtkStyle *style = gtk_widget_get_style (widget);
PangoLayout *layout;
PangoRectangle ink_rect;
gint size;
layout = gimp_ruler_get_layout (widget, "0123456789");
pango_layout_get_pixel_extents (layout, &ink_rect, NULL);
size = 2 + ink_rect.height * 1.7;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
requisition->width = style->xthickness * 2 + 1;
requisition->height = style->ythickness * 2 + size;
}
else
{
requisition->width = style->xthickness * 2 + size;
requisition->height = style->ythickness * 2 + 1;
}
}
static void
gimp_ruler_style_set (GtkWidget *widget,
GtkStyle *prev_style)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget);
GTK_WIDGET_CLASS (gimp_ruler_parent_class)->style_set (widget, prev_style);
gtk_widget_style_get (widget,
"font-scale", &priv->font_scale,
NULL);
if (priv->layout)
{
g_object_unref (priv->layout);
priv->layout = NULL;
}
}
static gboolean
gimp_ruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
GimpRuler *ruler = GIMP_RULER (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
GtkAllocation allocation;
gdouble lower;
gdouble upper;
gdk_event_request_motions (event);
gtk_widget_get_allocation (widget, &allocation);
gimp_ruler_get_range (ruler, &lower, &upper, NULL);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
gimp_ruler_set_position (ruler,
lower +
(upper - lower) * event->x /
allocation.width);
}
else
{
gimp_ruler_set_position (ruler,
lower +
(upper - lower) * event->y /
allocation.height);
}
return FALSE;
}
static gboolean
gimp_ruler_expose (GtkWidget *widget,
GdkEventExpose *event)
{
if (gtk_widget_is_drawable (widget))
{
GimpRuler *ruler = GIMP_RULER (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
gimp_ruler_draw_ticks (ruler);
gdk_draw_drawable (gtk_widget_get_window (widget),
priv->non_gr_exp_gc,
priv->backing_store,
0, 0, 0, 0,
allocation.width,
allocation.height);
gimp_ruler_draw_pos (ruler);
}
return FALSE;
}
static void
gimp_ruler_draw_ticks (GimpRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GtkStyle *style = gtk_widget_get_style (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
GtkStateType state = gtk_widget_get_state (widget);
GtkAllocation allocation;
cairo_t *cr;
gint i;
gint width, height;
gint xthickness;
gint ythickness;
gint length, ideal_length;
gdouble lower, upper; /* Upper and lower limits, in ruler units */
gdouble increment; /* Number of pixels per unit */
gint scale; /* Number of units per major unit */
gdouble start, end, cur;
gchar unit_str[32];
gint digit_height;
gint digit_offset;
gint text_size;
gint pos;
gdouble max_size;
GimpUnit unit;
PangoLayout *layout;
PangoRectangle logical_rect, ink_rect;
if (! gtk_widget_is_drawable (widget))
return;
gtk_widget_get_allocation (widget, &allocation);
xthickness = style->xthickness;
ythickness = style->ythickness;
layout = gimp_ruler_get_layout (widget, "0123456789");
pango_layout_get_extents (layout, &ink_rect, &logical_rect);
digit_height = PANGO_PIXELS (ink_rect.height) + 2;
digit_offset = ink_rect.y;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
width = allocation.width;
height = allocation.height - ythickness * 2;
}
else
{
width = allocation.height;
height = allocation.width - ythickness * 2;
}
gtk_paint_box (style, priv->backing_store,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, widget,
priv->orientation == GTK_ORIENTATION_HORIZONTAL ?
"hruler" : "vruler",
0, 0,
allocation.width, allocation.height);
cr = gdk_cairo_create (priv->backing_store);
gdk_cairo_set_source_color (cr, &style->fg[state]);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_rectangle (cr,
xthickness,
height + ythickness,
allocation.width - 2 * xthickness,
1);
}
else
{
cairo_rectangle (cr,
height + xthickness,
ythickness,
1,
allocation.height - 2 * ythickness);
}
gimp_ruler_get_range (ruler, &lower, &upper, &max_size);
if ((upper - lower) == 0)
goto out;
increment = (gdouble) width / (upper - lower);
/* determine the scale
* use the maximum extents of the ruler to determine the largest
* possible number to be displayed. Calculate the height in pixels
* of this displayed text. Use this height to find a scale which
* leaves sufficient room for drawing the ruler.
*
* We calculate the text size as for the vruler instead of
* actually measuring the text width, so that the result for the
* scale looks consistent with an accompanying vruler.
*/
scale = ceil (max_size);
g_snprintf (unit_str, sizeof (unit_str), "%d", scale);
text_size = strlen (unit_str) * digit_height + 1;
for (scale = 0; scale < G_N_ELEMENTS (ruler_metric.ruler_scale); scale++)
if (ruler_metric.ruler_scale[scale] * fabs (increment) > 2 * text_size)
break;
if (scale == G_N_ELEMENTS (ruler_metric.ruler_scale))
scale = G_N_ELEMENTS (ruler_metric.ruler_scale) - 1;
unit = gimp_ruler_get_unit (ruler);
/* drawing starts here */
length = 0;
for (i = G_N_ELEMENTS (ruler_metric.subdivide) - 1; i >= 0; i--)
{
gdouble subd_incr;
/* hack to get proper subdivisions at full pixels */
if (unit == GIMP_UNIT_PIXEL && scale == 1 && i == 1)
subd_incr = 1.0;
else
subd_incr = ((gdouble) ruler_metric.ruler_scale[scale] /
(gdouble) ruler_metric.subdivide[i]);
if (subd_incr * fabs (increment) <= MINIMUM_INCR)
continue;
/* don't subdivide pixels */
if (unit == GIMP_UNIT_PIXEL && subd_incr < 1.0)
continue;
/* Calculate the length of the tickmarks. Make sure that
* this length increases for each set of ticks
*/
ideal_length = height / (i + 1) - 1;
if (ideal_length > ++length)
length = ideal_length;
if (lower < upper)
{
start = floor (lower / subd_incr) * subd_incr;
end = ceil (upper / subd_incr) * subd_incr;
}
else
{
start = floor (upper / subd_incr) * subd_incr;
end = ceil (lower / subd_incr) * subd_incr;
}
for (cur = start; cur <= end; cur += subd_incr)
{
pos = ROUND ((cur - lower) * increment);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_rectangle (cr,
pos, height + ythickness - length,
1, length);
}
else
{
cairo_rectangle (cr,
height + xthickness - length, pos,
length, 1);
}
/* draw label */
if (i == 0)
{
g_snprintf (unit_str, sizeof (unit_str), "%d", (int) cur);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
pango_layout_set_text (layout, unit_str, -1);
pango_layout_get_extents (layout, &logical_rect, NULL);
gtk_paint_layout (style,
priv->backing_store,
state,
FALSE,
NULL,
widget,
"hruler",
pos + 2,
ythickness + PANGO_PIXELS (logical_rect.y - digit_offset),
layout);
}
else
{
gint j;
for (j = 0; j < (int) strlen (unit_str); j++)
{
pango_layout_set_text (layout, unit_str + j, 1);
pango_layout_get_extents (layout, NULL, &logical_rect);
gtk_paint_layout (style,
priv->backing_store,
state,
FALSE,
NULL,
widget,
"vruler",
xthickness + 1,
pos + digit_height * j + 2 + PANGO_PIXELS (logical_rect.y - digit_offset),
layout);
}
}
}
}
}
cairo_fill (cr);
out:
cairo_destroy (cr);
}
static void
gimp_ruler_draw_pos (GimpRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GtkStyle *style = gtk_widget_get_style (widget);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
GtkStateType state = gtk_widget_get_state (widget);
GtkAllocation allocation;
gint x, y;
gint width, height;
gint bs_width, bs_height;
gint xthickness;
gint ythickness;
if (! gtk_widget_is_drawable (widget))
return;
gtk_widget_get_allocation (widget, &allocation);
xthickness = style->xthickness;
ythickness = style->ythickness;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
width = allocation.width;
height = allocation.height - ythickness * 2;
bs_width = height / 2 + 2;
bs_width |= 1; /* make sure it's odd */
bs_height = bs_width / 2 + 1;
}
else
{
width = allocation.width - xthickness * 2;
height = allocation.height;
bs_height = width / 2 + 2;
bs_height |= 1; /* make sure it's odd */
bs_width = bs_height / 2 + 1;
}
if ((bs_width > 0) && (bs_height > 0))
{
cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
gdouble lower;
gdouble upper;
gdouble position;
gdouble increment;
/* If a backing store exists, restore the ruler */
if (priv->backing_store)
gdk_draw_drawable (gtk_widget_get_window (widget),
style->black_gc,
priv->backing_store,
priv->xsrc, priv->ysrc,
priv->xsrc, priv->ysrc,
bs_width, bs_height);
position = gimp_ruler_get_position (ruler);
gimp_ruler_get_range (ruler, &lower, &upper, NULL);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
increment = (gdouble) width / (upper - lower);
x = ROUND ((position - lower) * increment) + (xthickness - bs_width) / 2 - 1;
y = (height + bs_height) / 2 + ythickness;
}
else
{
increment = (gdouble) height / (upper - lower);
x = (width + bs_width) / 2 + xthickness;
y = ROUND ((position - lower) * increment) + (ythickness - bs_height) / 2 - 1;
}
gdk_cairo_set_source_color (cr, &style->fg[state]);
cairo_move_to (cr, x, y);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
cairo_line_to (cr, x + bs_width / 2.0, y + bs_height);
cairo_line_to (cr, x + bs_width, y);
}
else
{
cairo_line_to (cr, x + bs_width, y + bs_height / 2.0);
cairo_line_to (cr, x, y + bs_height);
}
cairo_fill (cr);
cairo_destroy (cr);
priv->xsrc = x;
priv->ysrc = y;
}
}
static void
gimp_ruler_make_pixmap (GimpRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (ruler);
GtkAllocation allocation;
gint width;
gint height;
gtk_widget_get_allocation (widget, &allocation);
if (priv->backing_store)
{
gdk_drawable_get_size (priv->backing_store, &width, &height);
if ((width == allocation.width) &&
(height == allocation.height))
return;
g_object_unref (priv->backing_store);
}
priv->backing_store = gdk_pixmap_new (gtk_widget_get_window (widget),
allocation.width,
allocation.height,
-1);
if (!priv->non_gr_exp_gc)
{
priv->non_gr_exp_gc = gdk_gc_new (gtk_widget_get_window (widget));
gdk_gc_set_exposures (priv->non_gr_exp_gc, FALSE);
}
}
static PangoLayout *
gimp_ruler_create_layout (GtkWidget *widget,
const gchar *text)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget);
PangoLayout *layout;
PangoAttrList *attrs;
PangoAttribute *attr;
layout = gtk_widget_create_pango_layout (widget, text);
attrs = pango_attr_list_new ();
attr = pango_attr_scale_new (priv->font_scale);
attr->start_index = 0;
attr->end_index = -1;
pango_attr_list_insert (attrs, attr);
pango_layout_set_attributes (layout, attrs);
pango_attr_list_unref (attrs);
return layout;
}
static PangoLayout *
gimp_ruler_get_layout (GtkWidget *widget,
const gchar *text)
{
GimpRulerPrivate *priv = GIMP_RULER_GET_PRIVATE (widget);
if (priv->layout)
{
pango_layout_set_text (priv->layout, text, -1);
return priv->layout;
}
priv->layout = gimp_ruler_create_layout (widget, text);
return priv->layout;
}
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