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gimp/libgimpwidgets/gimphruler.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 2 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "gimpwidgetstypes.h"
#include "gimphruler.h"
#define RULER_HEIGHT 13
#define MINIMUM_INCR 5
static const struct
{
gdouble ruler_scale[16];
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 }
};
typedef struct
{
gint xsrc;
gint ysrc;
} GimpHRulerPrivate;
static gint gimp_hruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event);
static void gimp_hruler_draw_ticks (GimpRuler *ruler);
static void gimp_hruler_draw_pos (GimpRuler *ruler);
G_DEFINE_TYPE (GimpHRuler, gimp_hruler, GIMP_TYPE_RULER)
#define GIMP_HRULER_GET_PRIVATE(ruler) \
G_TYPE_INSTANCE_GET_PRIVATE (ruler, GIMP_TYPE_HRULER, GimpHRulerPrivate)
static void
gimp_hruler_class_init (GimpHRulerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpRulerClass *ruler_class = GIMP_RULER_CLASS (klass);
widget_class->motion_notify_event = gimp_hruler_motion_notify;
ruler_class->draw_ticks = gimp_hruler_draw_ticks;
ruler_class->draw_pos = gimp_hruler_draw_pos;
g_type_class_add_private (object_class, sizeof (GimpHRulerPrivate));
}
static void
gimp_hruler_init (GimpHRuler *hruler)
{
GtkWidget *widget = GTK_WIDGET (hruler);
widget->requisition.width = widget->style->xthickness * 2 + 1;
widget->requisition.height = widget->style->ythickness * 2 + RULER_HEIGHT;
}
/**
* gimp_hruler_new:
*
* Creates a new horizontal ruler.
*
* Return value: a new #GimpHRuler widget.
*
* Since: GIMP 2.8
**/
GtkWidget*
gimp_hruler_new (void)
{
return g_object_new (GIMP_TYPE_HRULER, NULL);
}
static gint
gimp_hruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
GimpRuler *ruler = GIMP_RULER (widget);
gdouble lower;
gdouble upper;
gint x;
gdk_event_request_motions (event);
x = event->x;
gimp_ruler_get_range (ruler, &lower, &upper, NULL);
gimp_ruler_set_position (ruler,
lower +
((upper - lower) * x) / widget->allocation.width);
return FALSE;
}
static void
gimp_hruler_draw_ticks (GimpRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
GdkDrawable *backing_store;
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_width;
gint pos;
gdouble max_size;
GimpUnit unit;
PangoLayout *layout;
PangoRectangle logical_rect, ink_rect;
if (! GTK_WIDGET_DRAWABLE (widget))
return;
backing_store = _gimp_ruler_get_backing_store (ruler);
xthickness = widget->style->xthickness;
ythickness = widget->style->ythickness;
layout = _gimp_ruler_create_pango_layout (widget, "012456789");
pango_layout_get_extents (layout, &ink_rect, &logical_rect);
digit_height = PANGO_PIXELS (ink_rect.height) + 2;
digit_offset = ink_rect.y;
width = widget->allocation.width;
height = widget->allocation.height - ythickness * 2;
gtk_paint_box (widget->style, backing_store,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, widget, "hruler",
0, 0,
widget->allocation.width, widget->allocation.height);
cr = gdk_cairo_create (backing_store);
gdk_cairo_set_source_color (cr, &widget->style->fg[widget->state]);
cairo_rectangle (cr,
xthickness,
height + ythickness,
widget->allocation.width - 2 * xthickness,
1);
gimp_ruler_get_range (ruler, &lower, &upper, &max_size);
if ((upper - lower) == 0)
goto out;
increment = (gdouble) width / (upper - lower);
/* determine the scale
* We calculate the text size as for the vruler instead of using
* text_width = gdk_string_width(font, unit_str), 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_width = 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_width)
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);
cairo_rectangle (cr,
pos, height + ythickness - length,
1, length);
/* draw label */
if (i == 0)
{
g_snprintf (unit_str, sizeof (unit_str), "%d", (int) cur);
pango_layout_set_text (layout, unit_str, -1);
pango_layout_get_extents (layout, &logical_rect, NULL);
gtk_paint_layout (widget->style,
backing_store,
GTK_WIDGET_STATE (widget),
FALSE,
NULL,
widget,
"hruler",
pos + 2,
ythickness + PANGO_PIXELS (logical_rect.y - digit_offset),
layout);
}
}
}
cairo_fill (cr);
out:
cairo_destroy (cr);
g_object_unref (layout);
}
static void
gimp_hruler_draw_pos (GimpRuler *ruler)
{
GtkWidget *widget = GTK_WIDGET (ruler);
if (GTK_WIDGET_DRAWABLE (ruler))
{
GimpHRulerPrivate *priv = GIMP_HRULER_GET_PRIVATE (ruler);
gint x, y;
gint width, height;
gint bs_width, bs_height;
gint xthickness;
gint ythickness;
xthickness = widget->style->xthickness;
ythickness = widget->style->ythickness;
width = widget->allocation.width;
height = widget->allocation.height - ythickness * 2;
bs_width = height / 2 + 2;
bs_width |= 1; /* make sure it's odd */
bs_height = bs_width / 2 + 1;
if ((bs_width > 0) && (bs_height > 0))
{
GdkDrawable *backing_store = _gimp_ruler_get_backing_store (ruler);
cairo_t *cr = gdk_cairo_create (widget->window);
gdouble lower;
gdouble upper;
gdouble position;
gdouble increment;
/* If a backing store exists, restore the ruler */
if (backing_store)
gdk_draw_drawable (widget->window,
widget->style->black_gc,
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);
increment = (gdouble) width / (upper - lower);
x = ROUND ((position - lower) * increment) + (xthickness - bs_width) / 2 - 1;
y = (height + bs_height) / 2 + ythickness;
gdk_cairo_set_source_color (cr, &widget->style->fg[widget->state]);
cairo_move_to (cr, x, y);
cairo_line_to (cr, x + bs_width / 2., y + bs_height);
cairo_line_to (cr, x + bs_width, y);
cairo_fill (cr);
cairo_destroy (cr);
priv->xsrc = x;
priv->ysrc = y;
}
}
}
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