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gimp/app/measure.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Measure tool
* Copyright (C) 1999 Sven Neumann <sven@gimp.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "appenv.h"
#include "draw_core.h"
#include "gimpui.h"
#include "info_dialog.h"
#include "measure.h"
#include "undo.h"
#include "libgimp/gimpintl.h"
#include "libgimp/gimpmath.h"
/* definitions */
#define TARGET 8
#define ARC_RADIUS 30
#define ARC_RADIUS_2 1100
#define STATUSBAR_SIZE 128
/* possible measure functions */
typedef enum
{
CREATING,
ADDING,
MOVING,
GUIDING,
FINISHED
} MeasureFunction;
/* the measure structure */
typedef struct _MeasureTool MeasureTool;
struct _MeasureTool
{
DrawCore *core; /* draw core */
MeasureFunction function; /* what are we doing? */
gint point; /* what are we manipulating? */
gint num_points; /* how many points? */
gint x[3]; /* three x coordinates */
gint y[3]; /* three y coordinates */
gdouble angle1; /* first angle */
gdouble angle2; /* second angle */
guint context_id; /* for the statusbar */
};
/* the measure tool options */
typedef struct _MeasureOptions MeasureOptions;
struct _MeasureOptions
{
ToolOptions tool_options;
gboolean use_info_window;
gboolean use_info_window_d;
GtkWidget *use_info_window_w;
};
/* maximum information buffer size */
#define MAX_INFO_BUF 16
static MeasureOptions *measure_tool_options = NULL;
/* the measure tool info window */
static InfoDialog *measure_tool_info = NULL;
static gchar distance_buf [MAX_INFO_BUF];
static gchar angle_buf [MAX_INFO_BUF];
/* local function prototypes */
static void measure_tool_button_press (Tool *, GdkEventButton *, gpointer);
static void measure_tool_button_release (Tool *, GdkEventButton *, gpointer);
static void measure_tool_motion (Tool *, GdkEventMotion *, gpointer);
static void measure_tool_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void measure_tool_control (Tool *, ToolAction, gpointer);
static void measure_tool_info_window_close_callback (GtkWidget *, gpointer);
static void measure_tool_info_update (void);
static void
measure_tool_options_reset (void)
{
MeasureOptions *options = measure_tool_options;
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->use_info_window_w),
options->use_info_window_d);
}
static MeasureOptions *
measure_tool_options_new (void)
{
MeasureOptions *options;
GtkWidget *vbox;
/* the new measure tool options structure */
options = g_new (MeasureOptions, 1);
tool_options_init ((ToolOptions *) options,
_("Measure Tool"),
measure_tool_options_reset);
options->use_info_window = options->use_info_window_d = FALSE;
/* the main vbox */
vbox = options->tool_options.main_vbox;
/* the use_info_window toggle button */
options->use_info_window_w =
gtk_check_button_new_with_label (_("Use Info Window"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->use_info_window_w),
options->use_info_window_d);
gtk_box_pack_start (GTK_BOX (vbox), options->use_info_window_w, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (options->use_info_window_w), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&options->use_info_window);
gtk_widget_show (options->use_info_window_w);
return options;
}
static double
measure_get_angle (int dx,
int dy,
double xres,
double yres)
{
double angle;
if (dx)
angle = 180.0 / G_PI * atan (((double)(dy) / yres) / ((double)(dx) / xres));
else if (dy)
angle = dy > 0 ? 270.0 : 90.0;
else
angle = 180.0;
if (dx > 0)
{
if (dy > 0)
angle = 360.0 - angle;
else
angle = -angle;
}
else
angle = 180.0 - angle;
return (angle);
}
static void
measure_tool_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
MeasureTool * measure_tool;
gint x[3];
gint y[3];
gint i;
gdisp = (GDisplay *) gdisp_ptr;
measure_tool = (MeasureTool *) tool->private;
/* if we are changing displays, pop the statusbar of the old one */
if (tool->state == ACTIVE && gdisp_ptr != tool->gdisp_ptr)
{
GDisplay *old_gdisp = tool->gdisp_ptr;
gtk_statusbar_pop (GTK_STATUSBAR (old_gdisp->statusbar),
measure_tool->context_id);
gtk_statusbar_push (GTK_STATUSBAR (gdisp->statusbar),
measure_tool->context_id, (""));
}
measure_tool->function = CREATING;
if (tool->state == ACTIVE && gdisp_ptr == tool->gdisp_ptr)
{
/* if the cursor is in one of the handles,
the new function will be moving or adding a new point or guide */
for (i=0; i < measure_tool->num_points; i++)
{
gdisplay_transform_coords (gdisp, measure_tool->x[i], measure_tool->y[i],
&x[i], &y[i], FALSE);
if (bevent->x == CLAMP (bevent->x, x[i] - TARGET, x[i] + TARGET) &&
bevent->y == CLAMP (bevent->y, y[i] - TARGET, y[i] + TARGET))
{
if (bevent->state & (GDK_CONTROL_MASK | GDK_MOD1_MASK))
{
Guide *guide;
if (bevent->state & GDK_CONTROL_MASK &&
(measure_tool->y[i] == CLAMP (measure_tool->y[i], 0, gdisp->gimage->height)))
{
guide = gimp_image_add_hguide (gdisp->gimage);
undo_push_guide (gdisp->gimage, guide);
guide->position = measure_tool->y[i];
gdisplays_expose_guide (gdisp->gimage, guide);
}
if (bevent->state & GDK_MOD1_MASK &&
(measure_tool->x[i] == CLAMP (measure_tool->x[i], 0, gdisp->gimage->width)))
{
guide = gimp_image_add_vguide (gdisp->gimage);
undo_push_guide (gdisp->gimage, guide);
guide->position = measure_tool->x[i];
gdisplays_expose_guide (gdisp->gimage, guide);
}
gdisplays_flush ();
measure_tool->function = GUIDING;
break;
}
measure_tool->function = (bevent->state & GDK_SHIFT_MASK) ? ADDING : MOVING;
measure_tool->point = i;
break;
}
}
/* adding to the middle point makes no sense */
if (i == 0 && measure_tool->function == ADDING && measure_tool->num_points == 3)
measure_tool->function = MOVING;
}
if (measure_tool->function == CREATING)
{
if (tool->state == ACTIVE)
draw_core_stop (measure_tool->core, tool);
else
/* initialize the statusbar display */
measure_tool->context_id =
gtk_statusbar_get_context_id (GTK_STATUSBAR (gdisp->statusbar), "measure");
/* set the first point and go into ADDING mode */
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y,
&measure_tool->x[0], &measure_tool->y[0], TRUE, FALSE);
measure_tool->point = 0;
measure_tool->num_points = 1;
measure_tool->function = ADDING;
/* set the gdisplay */
tool->gdisp_ptr = gdisp_ptr;
/* start drawing the measure tool */
draw_core_start (measure_tool->core, gdisp->canvas->window, tool);
}
/* create the info window if necessary */
if (!measure_tool_info &&
(measure_tool_options->use_info_window ||
!GTK_WIDGET_VISIBLE (gdisp->statusarea)))
{
measure_tool_info = info_dialog_new (_("Measure Tool"),
tools_help_func, NULL);
info_dialog_add_label (measure_tool_info, _("Distance:"), distance_buf);
info_dialog_add_label (measure_tool_info, _("Angle:"), angle_buf);
gimp_dialog_create_action_area
(GTK_DIALOG (measure_tool_info->shell),
_("Close"), measure_tool_info_window_close_callback,
measure_tool_info, NULL, NULL, TRUE, FALSE,
NULL);
}
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
tool->state = ACTIVE;
/* set the pointer to the crosshair,
* so one actually sees the cursor position
*/
gdisplay_install_tool_cursor (gdisp, GDK_TCROSS);
}
static void
measure_tool_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
MeasureTool * measure_tool;
gdisp = (GDisplay *) gdisp_ptr;
measure_tool = (MeasureTool *) tool->private;
measure_tool->function = FINISHED;
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
}
static void
measure_tool_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
MeasureTool * measure_tool;
int x, y;
int ax, ay;
int bx, by;
int dx, dy;
int i;
int tmp;
double angle;
double distance;
gchar status_str[STATUSBAR_SIZE];
gdisp = (GDisplay *) gdisp_ptr;
measure_tool = (MeasureTool *) tool->private;
/* undraw the current tool */
draw_core_pause (measure_tool->core, tool);
/* get the coordinates */
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, TRUE, FALSE);
/*
* A few comments here, because this routine looks quite weird at first ...
*
* The goal is to keep point 0, called the start point, to be always the one
* in the middle or, if there are only two points, the one that is fixed.
* The angle is then always measured at this point.
*/
switch (measure_tool->function)
{
case ADDING:
switch (measure_tool->point)
{
case 0: /* we are adding to the start point */
break;
case 1: /* we are adding to the end point, make it the new start point */
tmp = measure_tool->x[0];
measure_tool->x[0] = measure_tool->x[1];
measure_tool->x[1] = tmp;
tmp = measure_tool->y[0];
measure_tool->y[0] = measure_tool->y[1];
measure_tool->y[1] = tmp;
break;
case 2: /* we are adding to the third point, make it the new start point */
measure_tool->x[1] = measure_tool->x[0];
measure_tool->y[1] = measure_tool->y[0];
measure_tool->x[0] = measure_tool->x[2];
measure_tool->y[0] = measure_tool->y[2];
break;
default:
break;
}
measure_tool->num_points = MIN (measure_tool->num_points + 1, 3);
measure_tool->point = measure_tool->num_points - 1;
measure_tool->function = MOVING;
/* no, don't break here! */
case MOVING:
/* if we are moving the start point and only have two, make it the end point */
if (measure_tool->num_points == 2 && measure_tool->point == 0)
{
tmp = measure_tool->x[0];
measure_tool->x[0] = measure_tool->x[1];
measure_tool->x[1] = tmp;
tmp = measure_tool->y[0];
measure_tool->y[0] = measure_tool->y[1];
measure_tool->y[1] = tmp;
measure_tool->point = 1;
}
i = measure_tool->point;
measure_tool->x[i] = x;
measure_tool->y[i] = y;
/* restrict to horizontal/vertical movements, if modifiers are pressed */
if (mevent->state & GDK_MOD1_MASK)
{
if (mevent->state & GDK_CONTROL_MASK)
{
dx = measure_tool->x[i] - measure_tool->x[0];
dy = measure_tool->y[i] - measure_tool->y[0];
measure_tool->x[i] = measure_tool->x[0] +
(dx > 0 ? MAX (abs (dx), abs (dy)) : - MAX (abs (dx), abs (dy)));
measure_tool->y[i] = measure_tool->y[0] +
(dy > 0 ? MAX (abs (dx), abs (dy)) : - MAX (abs (dx), abs (dy)));
}
else
measure_tool->x[i] = measure_tool->x[0];
}
else if (mevent->state & GDK_CONTROL_MASK)
measure_tool->y[i] = measure_tool->y[0];
break;
default:
break;
}
/* calculate distance and angle */
ax = measure_tool->x[1] - measure_tool->x[0];
ay = measure_tool->y[1] - measure_tool->y[0];
if (measure_tool->num_points == 3)
{
bx = measure_tool->x[2] - measure_tool->x[0];
by = measure_tool->y[2] - measure_tool->y[0];
}
else
{
bx = ax < 0 ? -1 : 1;
by = 0;
}
if (gdisp->dot_for_dot)
{
distance = sqrt (SQR (ax - bx) + SQR (ay - by));
measure_tool->angle1 = measure_get_angle (ax, ay, 1.0, 1.0);
measure_tool->angle2 = measure_get_angle (bx, by, 1.0, 1.0);
angle = fabs (measure_tool->angle1 - measure_tool->angle2);
if (angle > 180.0)
angle = fabs (360.0 - angle);
g_snprintf (status_str, STATUSBAR_SIZE, "%.1f %s, %.2f %s",
distance, _("pixels"), angle, _("degrees"));
if (measure_tool_options)
{
g_snprintf (distance_buf, MAX_INFO_BUF, "%.1f %s", distance, _("pixels"));
g_snprintf (angle_buf, MAX_INFO_BUF, "%.2f %s", angle, _("degrees"));
}
}
else /* show real world units */
{
gchar *format_str = g_strdup_printf ("%%.%df %s, %%.2f %s",
gimp_unit_get_digits (gdisp->gimage->unit),
gimp_unit_get_symbol (gdisp->gimage->unit),
_("degrees"));
distance = gimp_unit_get_factor (gdisp->gimage->unit) *
sqrt (SQR ((double)(ax - bx) / gdisp->gimage->xresolution) +
SQR ((double)(ay - by) / gdisp->gimage->yresolution));
measure_tool->angle1 = measure_get_angle (ax, ay,
gdisp->gimage->xresolution,
gdisp->gimage->yresolution);
measure_tool->angle2 = measure_get_angle (bx, by,
gdisp->gimage->xresolution,
gdisp->gimage->yresolution);
angle = fabs (measure_tool->angle1 - measure_tool->angle2);
if (angle > 180.0)
angle = fabs (360.0 - angle);
g_snprintf (status_str, STATUSBAR_SIZE, format_str, distance , angle);
g_free (format_str);
if (measure_tool_options)
{
gchar *format_str = g_strdup_printf ("%%.%df %s",
gimp_unit_get_digits (gdisp->gimage->unit),
gimp_unit_get_symbol (gdisp->gimage->unit));
g_snprintf (distance_buf, MAX_INFO_BUF, format_str, distance);
g_snprintf (angle_buf, MAX_INFO_BUF, "%.2f %s", angle, _("degrees"));
g_free (format_str);
}
}
/* show info in statusbar */
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), measure_tool->context_id);
gtk_statusbar_push (GTK_STATUSBAR (gdisp->statusbar), measure_tool->context_id,
status_str);
/* and in the info window */
if (measure_tool_info)
measure_tool_info_update ();
/* redraw the current tool */
draw_core_resume (measure_tool->core, tool);
}
static void
measure_tool_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GdkCursorType ctype = GDK_TCROSS;
MeasureTool *measure_tool;
GDisplay *gdisp;
int x[3];
int y[3];
int i;
gdisp = (GDisplay *) gdisp_ptr;
measure_tool = (MeasureTool *) tool->private;
if (tool->state == ACTIVE && tool->gdisp_ptr == gdisp_ptr)
{
for (i=0; i<measure_tool->num_points; i++)
{
gdisplay_transform_coords (gdisp, measure_tool->x[i], measure_tool->y[i],
&x[i], &y[i], FALSE);
if (mevent->x == CLAMP (mevent->x, x[i] - TARGET, x[i] + TARGET) &&
mevent->y == CLAMP (mevent->y, y[i] - TARGET, y[i] + TARGET))
{
if (mevent->state & GDK_CONTROL_MASK)
{
if (mevent->state & GDK_MOD1_MASK)
ctype = GDK_BOTTOM_RIGHT_CORNER;
else
ctype = GDK_BOTTOM_SIDE;
break;
}
if (mevent->state & GDK_MOD1_MASK)
{
ctype = GDK_RIGHT_SIDE;
break;
}
ctype = (mevent->state & GDK_SHIFT_MASK) ? GDK_EXCHANGE : GDK_FLEUR;
if (i == 0 && measure_tool->num_points == 3 && ctype == GDK_EXCHANGE)
ctype = GDK_FLEUR;
break;
}
}
}
gdisplay_install_tool_cursor (gdisp, ctype);
}
static void
measure_tool_draw (Tool *tool)
{
GDisplay * gdisp;
MeasureTool * measure_tool;
int x[3];
int y[3];
int i;
int angle1, angle2;
int draw_arc = 0;
gdisp = (GDisplay *) tool->gdisp_ptr;
measure_tool = (MeasureTool *) tool->private;
for (i = 0; i < measure_tool->num_points; i++)
{
gdisplay_transform_coords (gdisp, measure_tool->x[i], measure_tool->y[i],
&x[i], &y[i], FALSE);
if (i == 0 && measure_tool->num_points == 3)
{
gdk_draw_arc (measure_tool->core->win, measure_tool->core->gc, FALSE,
x[i] - (TARGET >> 1), y[i] - (TARGET >> 1),
TARGET, TARGET, 0, 23040);
}
else
{
gdk_draw_line (measure_tool->core->win, measure_tool->core->gc,
x[i] - TARGET, y[i],
x[i] + TARGET, y[i]);
gdk_draw_line (measure_tool->core->win, measure_tool->core->gc,
x[i], y[i] - TARGET,
x[i], y[i] + TARGET);
}
if (i > 0)
{
gdk_draw_line (measure_tool->core->win, measure_tool->core->gc,
x[0], y[0],
x[i], y[i]);
/* only draw the arc if the lines are long enough */
if ((SQR (x[i] - x[0]) + SQR (y[i] - y[0])) > ARC_RADIUS_2)
draw_arc++;
}
}
if (measure_tool->num_points > 1 && draw_arc == measure_tool->num_points - 1)
{
angle1 = measure_tool->angle2 * 64.0;
angle2 = (measure_tool->angle1 - measure_tool->angle2) * 64.0;
if (angle2 > 11520)
angle2 -= 23040;
if (angle2 < -11520)
angle2 += 23040;
if (angle2 != 0)
{
gdk_draw_arc (measure_tool->core->win, measure_tool->core->gc, FALSE,
x[0] - ARC_RADIUS, y[0] - ARC_RADIUS,
2 * ARC_RADIUS, 2 * ARC_RADIUS,
angle1, angle2);
if (measure_tool->num_points == 2)
gdk_draw_line (measure_tool->core->win, measure_tool->core->gc,
x[0], y[0],
x[1] - x[0] < 0 ? x[0] - ARC_RADIUS - 4 : x[0] + ARC_RADIUS + 4,
y[0]);
}
}
}
static void
measure_tool_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
GDisplay * gdisp;
MeasureTool * measure_tool;
gdisp = (GDisplay *) tool->gdisp_ptr;
measure_tool = (MeasureTool *) tool->private;
switch (action)
{
case PAUSE:
draw_core_pause (measure_tool->core, tool);
break;
case RESUME:
draw_core_resume (measure_tool->core, tool);
break;
case HALT:
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), measure_tool->context_id);
draw_core_stop (measure_tool->core, tool);
tool->state = INACTIVE;
break;
default:
break;
}
}
static void
measure_tool_info_update (void)
{
info_dialog_update (measure_tool_info);
info_dialog_popup (measure_tool_info);
}
static void
measure_tool_info_window_close_callback (GtkWidget *widget,
gpointer client_data)
{
info_dialog_free (measure_tool_info);
measure_tool_info = NULL;
}
Tool *
tools_new_measure_tool (void)
{
Tool * tool;
MeasureTool * private;
/* The tool options */
if (! measure_tool_options)
{
measure_tool_options = measure_tool_options_new ();
tools_register (MEASURE, (ToolOptions *) measure_tool_options);
}
tool = tools_new_tool (MEASURE);
private = g_new (MeasureTool, 1);
private->core = draw_core_new (measure_tool_draw);
private->num_points = 0;
private->function = CREATING;
tool->private = (void *) private;
tool->preserve = TRUE; /* Preserve tool across drawable changes */
tool->button_press_func = measure_tool_button_press;
tool->button_release_func = measure_tool_button_release;
tool->motion_func = measure_tool_motion;
tool->cursor_update_func = measure_tool_cursor_update;
tool->control_func = measure_tool_control;
return tool;
}
void
tools_free_measure_tool (Tool *tool)
{
GDisplay * gdisp;
MeasureTool * measure_tool;
measure_tool = (MeasureTool *) tool->private;
gdisp = (GDisplay *) tool->gdisp_ptr;
if (tool->state == ACTIVE)
{
gtk_statusbar_pop (GTK_STATUSBAR (gdisp->statusbar), measure_tool->context_id);
draw_core_stop (measure_tool->core, tool);
}
draw_core_free (measure_tool->core);
if (measure_tool_info)
{
info_dialog_free (measure_tool_info);
measure_tool_info = NULL;
}
g_free (measure_tool);
}
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