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gtk3/gtk/gtkvruler.c

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C
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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "gtkvruler.h"
#define RULER_WIDTH 14
#define MINIMUM_INCR 5
#define MAXIMUM_SUBDIVIDE 5
#define MAXIMUM_SCALES 10
#define ROUND(x) ((int) ((x) + 0.5))
static void gtk_vruler_class_init (GtkVRulerClass *klass);
static void gtk_vruler_init (GtkVRuler *vruler);
static gint gtk_vruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event);
static void gtk_vruler_draw_ticks (GtkRuler *ruler);
static void gtk_vruler_draw_pos (GtkRuler *ruler);
GtkType
gtk_vruler_get_type (void)
{
static GtkType vruler_type = 0;
if (!vruler_type)
{
static const GtkTypeInfo vruler_info =
{
"GtkVRuler",
sizeof (GtkVRuler),
sizeof (GtkVRulerClass),
(GtkClassInitFunc) gtk_vruler_class_init,
(GtkObjectInitFunc) gtk_vruler_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
vruler_type = gtk_type_unique (GTK_TYPE_RULER, &vruler_info);
}
return vruler_type;
}
static void
gtk_vruler_class_init (GtkVRulerClass *klass)
{
GtkWidgetClass *widget_class;
GtkRulerClass *ruler_class;
widget_class = (GtkWidgetClass*) klass;
ruler_class = (GtkRulerClass*) klass;
widget_class->motion_notify_event = gtk_vruler_motion_notify;
ruler_class->draw_ticks = gtk_vruler_draw_ticks;
ruler_class->draw_pos = gtk_vruler_draw_pos;
}
static void
gtk_vruler_init (GtkVRuler *vruler)
{
GtkWidget *widget;
widget = GTK_WIDGET (vruler);
widget->requisition.width = widget->style->xthickness * 2 + RULER_WIDTH;
widget->requisition.height = widget->style->ythickness * 2 + 1;
}
GtkWidget*
gtk_vruler_new (void)
{
return GTK_WIDGET (gtk_type_new (GTK_TYPE_VRULER));
}
static gint
gtk_vruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
GtkRuler *ruler;
gint y;
ruler = GTK_RULER (widget);
if (event->is_hint)
gdk_window_get_pointer (widget->window, NULL, &y, NULL);
else
y = event->y;
ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * y) / widget->allocation.height;
g_object_notify (G_OBJECT (ruler), "position");
/* Make sure the ruler has been allocated already */
if (ruler->backing_store != NULL)
gtk_ruler_draw_pos (ruler);
return FALSE;
}
static void
gtk_vruler_draw_ticks (GtkRuler *ruler)
{
GtkWidget *widget;
GdkGC *gc, *bg_gc;
gint i, j;
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 subd_incr;
gdouble start, end, cur;
gchar unit_str[32];
gint digit_height;
gint digit_offset;
gint text_height;
gint pos;
PangoLayout *layout;
PangoRectangle logical_rect, ink_rect;
if (!GTK_WIDGET_DRAWABLE (ruler))
return;
widget = GTK_WIDGET (ruler);
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
xthickness = widget->style->xthickness;
ythickness = widget->style->ythickness;
layout = gtk_widget_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.height;
height = widget->allocation.width - ythickness * 2;
gtk_paint_box (widget->style, ruler->backing_store,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
NULL, widget, "vruler",
0, 0,
widget->allocation.width, widget->allocation.height);
gdk_draw_line (ruler->backing_store, gc,
height + xthickness,
ythickness,
height + xthickness,
widget->allocation.height - ythickness);
upper = ruler->upper / ruler->metric->pixels_per_unit;
lower = ruler->lower / ruler->metric->pixels_per_unit;
if ((upper - lower) == 0)
return;
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.
*/
scale = ceil (ruler->max_size / ruler->metric->pixels_per_unit);
sprintf (unit_str, "%d", scale);
text_height = strlen (unit_str) * digit_height + 1;
for (scale = 0; scale < MAXIMUM_SCALES; scale++)
if (ruler->metric->ruler_scale[scale] * fabs(increment) > 2 * text_height)
break;
if (scale == MAXIMUM_SCALES)
scale = MAXIMUM_SCALES - 1;
/* drawing starts here */
length = 0;
for (i = MAXIMUM_SUBDIVIDE - 1; i >= 0; i--)
{
subd_incr = (gdouble) ruler->metric->ruler_scale[scale] /
(gdouble) ruler->metric->subdivide[i];
if (subd_incr * fabs(increment) <= MINIMUM_INCR)
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);
gdk_draw_line (ruler->backing_store, gc,
height + xthickness - length, pos,
height + xthickness, pos);
/* draw label */
if (i == 0)
{
sprintf (unit_str, "%d", (int) cur);
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 (widget->style,
ruler->backing_store,
GTK_WIDGET_STATE (widget),
FALSE,
NULL,
widget,
"vruler",
xthickness + 1,
pos + digit_height * j + 2 + PANGO_PIXELS (logical_rect.y - digit_offset),
layout);
}
}
}
}
g_object_unref (G_OBJECT (layout));
}
static void
gtk_vruler_draw_pos (GtkRuler *ruler)
{
GtkWidget *widget;
GdkGC *gc;
int i;
gint x, y;
gint width, height;
gint bs_width, bs_height;
gint xthickness;
gint ythickness;
gdouble increment;
if (GTK_WIDGET_DRAWABLE (ruler))
{
widget = GTK_WIDGET (ruler);
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
xthickness = widget->style->xthickness;
ythickness = widget->style->ythickness;
width = widget->allocation.width - xthickness * 2;
height = widget->allocation.height;
bs_height = width / 2;
bs_height |= 1; /* make sure it's odd */
bs_width = bs_height / 2 + 1;
if ((bs_width > 0) && (bs_height > 0))
{
/* If a backing store exists, restore the ruler */
if (ruler->backing_store && ruler->non_gr_exp_gc)
gdk_draw_pixmap (ruler->widget.window,
ruler->non_gr_exp_gc,
ruler->backing_store,
ruler->xsrc, ruler->ysrc,
ruler->xsrc, ruler->ysrc,
bs_width, bs_height);
increment = (gdouble) height / (ruler->upper - ruler->lower);
x = (width + bs_width) / 2 + xthickness;
y = ROUND ((ruler->position - ruler->lower) * increment) + (ythickness - bs_height) / 2 - 1;
for (i = 0; i < bs_width; i++)
gdk_draw_line (widget->window, gc,
x + i, y + i,
x + i, y + bs_height - 1 - i);
ruler->xsrc = x;
ruler->ysrc = y;
}
}
}
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