gtk2/gtk/gtkhruler.c

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1997-11-24 22:37:52 +00:00
/* 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 Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "gtkhruler.h"
#define RULER_HEIGHT 14
#define MINIMUM_INCR 5
#define MAXIMUM_SUBDIVIDE 5
#define MAXIMUM_SCALES 10
#define ROUND(x) ((int) ((x) + 0.5))
static void gtk_hruler_class_init (GtkHRulerClass *klass);
static void gtk_hruler_init (GtkHRuler *hruler);
static gint gtk_hruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event);
static void gtk_hruler_draw_ticks (GtkRuler *ruler);
static void gtk_hruler_draw_pos (GtkRuler *ruler);
guint
gtk_hruler_get_type ()
{
static guint hruler_type = 0;
if (!hruler_type)
{
GtkTypeInfo hruler_info =
{
"GtkHRuler",
sizeof (GtkHRuler),
sizeof (GtkHRulerClass),
(GtkClassInitFunc) gtk_hruler_class_init,
(GtkObjectInitFunc) gtk_hruler_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL,
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};
hruler_type = gtk_type_unique (gtk_ruler_get_type (), &hruler_info);
}
return hruler_type;
}
static void
gtk_hruler_class_init (GtkHRulerClass *klass)
{
GtkWidgetClass *widget_class;
GtkRulerClass *ruler_class;
widget_class = (GtkWidgetClass*) klass;
ruler_class = (GtkRulerClass*) klass;
widget_class->motion_notify_event = gtk_hruler_motion_notify;
ruler_class->draw_ticks = gtk_hruler_draw_ticks;
ruler_class->draw_pos = gtk_hruler_draw_pos;
}
static void
gtk_hruler_init (GtkHRuler *hruler)
{
GtkWidget *widget;
widget = GTK_WIDGET (hruler);
widget->requisition.width = widget->style->klass->xthickness * 2 + 1;
widget->requisition.height = widget->style->klass->ythickness * 2 + RULER_HEIGHT;
}
GtkWidget*
gtk_hruler_new ()
{
return GTK_WIDGET (gtk_type_new (gtk_hruler_get_type ()));
}
static gint
gtk_hruler_motion_notify (GtkWidget *widget,
GdkEventMotion *event)
{
GtkRuler *ruler;
gint x;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_HRULER (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
ruler = GTK_RULER (widget);
if (event->is_hint)
gdk_window_get_pointer (widget->window, &x, NULL, NULL);
else
x = event->x;
ruler->position = ruler->lower + ((ruler->upper - ruler->lower) * x) / widget->allocation.width;
/* Make sure the ruler has been allocated already */
if (ruler->backing_store != NULL)
gtk_ruler_draw_pos (ruler);
return FALSE;
}
static void
gtk_hruler_draw_ticks (GtkRuler *ruler)
{
GtkWidget *widget;
GdkGC *gc, *bg_gc;
GdkFont *font;
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gint i;
gint width, height;
gint xthickness;
gint ythickness;
gint length, ideal_length;
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gfloat subd_incr;
gfloat step_incr;
gfloat increment;
gfloat start, end, cur;
gchar unit_str[12];
gint text_height;
gint digit_height;
gint pos;
gint scale;
g_return_if_fail (ruler != NULL);
g_return_if_fail (GTK_IS_HRULER (ruler));
if (GTK_WIDGET_DRAWABLE (ruler))
{
widget = GTK_WIDGET (ruler);
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
bg_gc = widget->style->bg_gc[GTK_STATE_NORMAL];
font = widget->style->font;
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xthickness = widget->style->klass->xthickness;
ythickness = widget->style->klass->ythickness;
digit_height = font->ascent; /* assume descent == 0? */
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width = widget->allocation.width;
height = widget->allocation.height - ythickness * 2;
gdk_draw_line (ruler->backing_store, gc,
xthickness,
height + ythickness,
widget->allocation.width - xthickness,
height + ythickness);
if ((ruler->upper - ruler->lower) == 0)
return;
increment = (gfloat) width * ruler->metric->pixels_per_unit / (ruler->upper - ruler->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 as for the vertical ruler case. 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] * increment > 2 * text_height)
break;
if (scale == MAXIMUM_SCALES)
scale = MAXIMUM_SCALES - 1;
length = 0;
for (i = MAXIMUM_SUBDIVIDE - 1; i >= 0; i--)
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{
subd_incr = (gfloat) ruler->metric->ruler_scale[scale] / (gfloat) ruler->metric->subdivide[i];
step_incr = subd_incr * increment;
if (step_incr <= MINIMUM_INCR)
continue;
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start = floor ((ruler->lower / ruler->metric->pixels_per_unit) / subd_incr) * subd_incr;
end = ceil ((ruler->upper / ruler->metric->pixels_per_unit) / subd_incr) * subd_incr;
ideal_length = height / (i + 1) - 1;
if (ideal_length > ++length)
length = ideal_length;
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cur = start;
while (cur <= end)
{
pos = ROUND ((cur - (ruler->lower / ruler->metric->pixels_per_unit)) * increment);
gdk_draw_line (ruler->backing_store, gc,
pos, height + ythickness, pos,
height - length + ythickness);
if (i == 0)
{
sprintf (unit_str, "%d", (int) cur);
gdk_draw_rectangle (ruler->backing_store,
bg_gc, TRUE,
pos + 1, ythickness,
gdk_string_width(font, unit_str) + 1,
digit_height);
gdk_draw_string (ruler->backing_store, font, gc,
pos + 2, ythickness + font->ascent - 1,
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unit_str);
}
cur += subd_incr;
}
}
}
}
static void
gtk_hruler_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;
gfloat increment;
g_return_if_fail (ruler != NULL);
g_return_if_fail (GTK_IS_HRULER (ruler));
if (GTK_WIDGET_DRAWABLE (ruler))
{
widget = GTK_WIDGET (ruler);
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
xthickness = widget->style->klass->xthickness;
ythickness = widget->style->klass->ythickness;
width = widget->allocation.width;
height = widget->allocation.height - ythickness * 2;
bs_width = height / 2;
bs_width |= 1; /* make sure it's odd */
bs_height = bs_width / 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 = (gfloat) width / (ruler->upper - ruler->lower);
x = ROUND ((ruler->position - ruler->lower) * increment) + (xthickness - bs_width) / 2 - 1;
y = (height + bs_height) / 2 + ythickness;
for (i = 0; i < bs_height; i++)
gdk_draw_line (widget->window, gc,
x + i, y + i,
x + bs_width - 1 - i, y + i);
ruler->xsrc = x;
ruler->ysrc = y;
}
}
}