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gimp/app/tools/gimpmeasuretool.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 <stdlib.h>
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#ifdef __GNUC__
#warning FIXME #include "gui/gui-types.h"
#endif
#include "gui/gui-types.h"
#include "core/gimpimage.h"
#include "core/gimpimage-guides.h"
#include "core/gimpimage-undo.h"
#include "core/gimpimage-undo-push.h"
#include "core/gimptoolinfo.h"
#include "widgets/gimpdialogfactory.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimpviewabledialog.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "gui/info-dialog.h"
#include "gimpmeasureoptions.h"
#include "gimpmeasuretool.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
/* definitions */
#define TARGET 8
#define ARC_RADIUS 30
#define STATUSBAR_SIZE 128
/* maximum information buffer size */
#define MAX_INFO_BUF 16
/* local function prototypes */
static void gimp_measure_tool_class_init (GimpMeasureToolClass *klass);
static void gimp_measure_tool_init (GimpMeasureTool *tool);
static void gimp_measure_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *gdisp);
static void gimp_measure_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_measure_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_measure_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_measure_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_measure_tool_draw (GimpDrawTool *draw_tool);
static gdouble measure_get_angle (gint dx,
gint dy,
gdouble xres,
gdouble yres);
static void measure_tool_info_window_close_callback (GtkWidget *widget,
gpointer data);
static void measure_tool_info_update (void);
/* 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];
static GimpDrawToolClass *parent_class = NULL;
void
gimp_measure_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_MEASURE_TOOL,
GIMP_TYPE_MEASURE_OPTIONS,
gimp_measure_options_gui,
0,
"gimp-measure-tool",
_("Measure"),
_("Measure angles and lengths"),
N_("/Tools/_Measure"), NULL,
NULL, GIMP_HELP_TOOL_MEASURE,
GIMP_STOCK_TOOL_MEASURE,
data);
}
GType
gimp_measure_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpMeasureToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_measure_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpMeasureTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_measure_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_DRAW_TOOL,
"GimpMeasureTool",
&tool_info, 0);
}
return tool_type;
}
static void
gimp_measure_tool_class_init (GimpMeasureToolClass *klass)
{
GimpToolClass *tool_class;
GimpDrawToolClass *draw_tool_class;
tool_class = GIMP_TOOL_CLASS (klass);
draw_tool_class = GIMP_DRAW_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
tool_class->control = gimp_measure_tool_control;
tool_class->button_press = gimp_measure_tool_button_press;
tool_class->button_release = gimp_measure_tool_button_release;
tool_class->motion = gimp_measure_tool_motion;
tool_class->cursor_update = gimp_measure_tool_cursor_update;
draw_tool_class->draw = gimp_measure_tool_draw;
}
static void
gimp_measure_tool_init (GimpMeasureTool *measure_tool)
{
GimpTool *tool;
tool = GIMP_TOOL (measure_tool);
gimp_tool_control_set_tool_cursor (tool->control, GIMP_MEASURE_TOOL_CURSOR);
}
static void
gimp_measure_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *gdisp)
{
GimpMeasureTool *measure_tool;
measure_tool = GIMP_MEASURE_TOOL (tool);
switch (action)
{
case PAUSE:
break;
case RESUME:
break;
case HALT:
gimp_tool_pop_status (tool);
gimp_tool_control_halt (tool->control);
break;
default:
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, gdisp);
}
static void
gimp_measure_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMeasureTool *measure_tool;
GimpMeasureOptions *options;
GimpDisplayShell *shell;
gint i;
measure_tool = GIMP_MEASURE_TOOL (tool);
options = GIMP_MEASURE_OPTIONS (tool->tool_info->tool_options);
shell = GIMP_DISPLAY_SHELL (gdisp->shell);
/* if we are changing displays, pop the statusbar of the old one */
if (gimp_tool_control_is_active (tool->control) && gdisp != tool->gdisp)
{
gimp_tool_pop_status (tool);
}
measure_tool->function = CREATING;
if (gimp_tool_control_is_active (tool->control) && gdisp == tool->gdisp)
{
/* 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++)
{
if (gimp_draw_tool_on_handle (GIMP_DRAW_TOOL (tool), gdisp,
coords->x,
coords->y,
GIMP_HANDLE_CIRCLE,
measure_tool->x[i],
measure_tool->y[i],
TARGET, TARGET,
GTK_ANCHOR_CENTER,
FALSE))
{
if (state & (GDK_CONTROL_MASK | GDK_MOD1_MASK))
{
GimpGuide *guide;
gboolean create_hguide;
gboolean create_vguide;
create_hguide = ((state & GDK_CONTROL_MASK) &&
(measure_tool->y[i] ==
CLAMP (measure_tool->y[i],
0,
gdisp->gimage->height)));
create_vguide = ((state & GDK_MOD1_MASK) &&
(measure_tool->x[i] ==
CLAMP (measure_tool->x[i],
0,
gdisp->gimage->width)));
if (create_hguide && create_vguide)
gimp_image_undo_group_start (gdisp->gimage,
GIMP_UNDO_GROUP_IMAGE_GUIDE,
_("Add Guides"));
if (create_hguide)
{
guide = gimp_image_add_hguide (gdisp->gimage,
measure_tool->y[i],
TRUE);
gimp_image_update_guide (gdisp->gimage, guide);
}
if (create_vguide)
{
guide = gimp_image_add_vguide (gdisp->gimage,
measure_tool->x[i],
TRUE);
gimp_image_update_guide (gdisp->gimage, guide);
}
if (create_hguide && create_vguide)
gimp_image_undo_group_end (gdisp->gimage);
if (create_hguide || create_vguide)
gimp_image_flush (gdisp->gimage);
measure_tool->function = GUIDING;
break;
}
measure_tool->function = (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 the function is still CREATING, we are outside the handles */
if (measure_tool->function == CREATING)
{
if (measure_tool->num_points > 1 && (state & GDK_MOD1_MASK))
{
measure_tool->function = MOVING_ALL;
measure_tool->last_x = coords->x;
measure_tool->last_y = coords->y;
}
}
}
if (measure_tool->function == CREATING)
{
if (gimp_tool_control_is_active (tool->control))
{
/* reset everything */
gimp_draw_tool_stop (GIMP_DRAW_TOOL (measure_tool));
distance_buf[0] = '\0';
angle_buf[0] = '\0';
if (measure_tool_info)
measure_tool_info_update ();
}
/* set the first point and go into ADDING mode */
measure_tool->x[0] = coords->x;
measure_tool->y[0] = coords->y;
measure_tool->point = 0;
measure_tool->num_points = 1;
measure_tool->function = ADDING;
/* set the gdisplay */
tool->gdisp = gdisp;
if (gimp_tool_control_is_active (tool->control))
{
gimp_tool_pop_status (tool);
gimp_tool_push_status (tool, " ");
}
/* start drawing the measure tool */
gimp_draw_tool_start (GIMP_DRAW_TOOL (tool), gdisp);
}
/* create the info window if necessary */
if (! measure_tool_info && (options->use_info_window ||
! GTK_WIDGET_VISIBLE (shell->statusbar)))
{
const gchar *stock_id;
stock_id = gimp_viewable_get_stock_id (GIMP_VIEWABLE (tool->tool_info));
measure_tool_info = info_dialog_new (NULL,
tool->tool_info->blurb,
GIMP_OBJECT (tool->tool_info)->name,
stock_id,
_("Measure Distances and Angles"),
gimp_standard_help_func,
tool->tool_info->help_id);
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 (GIMP_DIALOG (measure_tool_info->shell),
GTK_STOCK_CLOSE,
measure_tool_info_window_close_callback,
measure_tool_info, NULL, NULL, TRUE, TRUE,
NULL);
gimp_dialog_factory_add_foreign (gimp_dialog_factory_from_name ("toplevel"),
"gimp-measure-tool-dialog",
measure_tool_info->shell);
}
if (measure_tool_info)
gimp_viewable_dialog_set_viewable (GIMP_VIEWABLE_DIALOG (measure_tool_info->shell),
GIMP_VIEWABLE (tool->gdisp->gimage));
gimp_tool_control_activate (tool->control);
}
static void
gimp_measure_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMeasureTool *measure_tool;
measure_tool = GIMP_MEASURE_TOOL (tool);
measure_tool->function = FINISHED;
}
static void
gimp_measure_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMeasureTool *measure_tool;
GimpMeasureOptions *options;
GimpDisplayShell *shell;
gint ax, ay;
gint bx, by;
gint dx, dy;
gint i;
gint tmp;
gdouble angle;
gdouble distance;
gchar status_str[STATUSBAR_SIZE];
measure_tool = GIMP_MEASURE_TOOL (tool);
options = GIMP_MEASURE_OPTIONS (tool->tool_info->tool_options);
shell = GIMP_DISPLAY_SHELL (gdisp->shell);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (measure_tool));
/*
* 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] = ROUND (coords->x);
measure_tool->y[i] = ROUND (coords->y);
/* restrict to horizontal/vertical movements, if modifiers are pressed */
if (state & GDK_MOD1_MASK)
{
if (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 (state & GDK_CONTROL_MASK)
{
measure_tool->y[i] = measure_tool->y[0];
}
break;
case MOVING_ALL:
dx = ROUND (coords->x) - measure_tool->last_x;
dy = ROUND (coords->y) - measure_tool->last_y;
for (i = 0; i < measure_tool->num_points; i++)
{
measure_tool->x[i] += dx;
measure_tool->y[i] += dy;
}
measure_tool->last_x = ROUND (coords->x);
measure_tool->last_y = ROUND (coords->y);
break;
default:
break;
}
if (measure_tool->function == MOVING)
{
/* 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 = 0;
by = 0;
}
if (shell->dot_for_dot)
{
distance = sqrt (SQR (ax - bx) + SQR (ay - by));
if (measure_tool->num_points != 3)
bx = ax > 0 ? 1 : -1;
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, sizeof (status_str), "%.1f %s, %.2f %s",
distance, _("pixels"), angle, _("degrees"));
g_snprintf (distance_buf, sizeof (distance_buf), "%.1f %s",
distance, _("pixels"));
g_snprintf (angle_buf, sizeof (angle_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 ((gdouble)(ax - bx) / gdisp->gimage->xresolution) +
SQR ((gdouble)(ay - by) / gdisp->gimage->yresolution));
if (measure_tool->num_points != 3)
bx = ax > 0 ? 1 : -1;
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, sizeof (status_str), format_str,
distance, angle);
g_free (format_str);
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, sizeof (distance_buf), format_str,
distance);
g_snprintf (angle_buf, sizeof (angle_buf), "%.2f %s",
angle, _("degrees"));
g_free (format_str);
}
/* show info in statusbar */
gimp_tool_pop_status (tool);
gimp_tool_push_status (tool, status_str);
/* and in the info window */
if (measure_tool_info)
measure_tool_info_update ();
} /* measure_tool->function == MOVING */
gimp_draw_tool_resume (GIMP_DRAW_TOOL (measure_tool));
}
static void
gimp_measure_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMeasureTool *measure_tool;
gboolean in_handle = FALSE;
GdkCursorType ctype = GIMP_CROSSHAIR_SMALL_CURSOR;
GimpCursorModifier cmodifier = GIMP_CURSOR_MODIFIER_NONE;
gint i;
measure_tool = GIMP_MEASURE_TOOL (tool);
if (gimp_tool_control_is_active (tool->control) && tool->gdisp == gdisp)
{
for (i = 0; i < measure_tool->num_points; i++)
{
if (gimp_draw_tool_on_handle (GIMP_DRAW_TOOL (tool), gdisp,
coords->x,
coords->y,
GIMP_HANDLE_CIRCLE,
measure_tool->x[i],
measure_tool->y[i],
TARGET, TARGET,
GTK_ANCHOR_CENTER,
FALSE))
{
in_handle = TRUE;
if (state & GDK_CONTROL_MASK)
{
if (state & GDK_MOD1_MASK)
ctype = GDK_BOTTOM_RIGHT_CORNER;
else
ctype = GDK_BOTTOM_SIDE;
break;
}
if (state & GDK_MOD1_MASK)
{
ctype = GDK_RIGHT_SIDE;
break;
}
if (state & GDK_SHIFT_MASK)
cmodifier = GIMP_CURSOR_MODIFIER_PLUS;
else
cmodifier = GIMP_CURSOR_MODIFIER_MOVE;
if (i == 0 && measure_tool->num_points == 3 &&
cmodifier == GIMP_CURSOR_MODIFIER_PLUS)
cmodifier = GIMP_CURSOR_MODIFIER_MOVE;
break;
}
}
if (! in_handle && measure_tool->num_points > 1 && (state & GDK_MOD1_MASK))
cmodifier = GIMP_CURSOR_MODIFIER_MOVE;
}
gimp_tool_control_set_cursor (tool->control, ctype);
gimp_tool_control_set_cursor_modifier (tool->control, cmodifier);
GIMP_TOOL_CLASS (parent_class)->cursor_update (tool, coords, state, gdisp);
}
static void
gimp_measure_tool_draw (GimpDrawTool *draw_tool)
{
GimpMeasureTool *measure_tool;
GimpTool *tool;
gint i;
gint angle1, angle2;
gint draw_arc = 0;
measure_tool = GIMP_MEASURE_TOOL (draw_tool);
tool = GIMP_TOOL (draw_tool);
for (i = 0; i < measure_tool->num_points; i++)
{
if (i == 0 && measure_tool->num_points == 3)
{
gimp_draw_tool_draw_handle (draw_tool,
GIMP_HANDLE_CIRCLE,
measure_tool->x[i],
measure_tool->y[i],
TARGET,
TARGET,
GTK_ANCHOR_CENTER,
FALSE);
}
else
{
gimp_draw_tool_draw_handle (draw_tool,
GIMP_HANDLE_CROSS,
measure_tool->x[i],
measure_tool->y[i],
TARGET * 2,
TARGET * 2,
GTK_ANCHOR_CENTER,
FALSE);
}
if (i > 0)
{
gimp_draw_tool_draw_line (draw_tool,
measure_tool->x[0],
measure_tool->y[0],
measure_tool->x[i],
measure_tool->y[i],
FALSE);
/* only draw the arc if the lines are long enough */
if (gimp_draw_tool_calc_distance (draw_tool, tool->gdisp,
measure_tool->x[0],
measure_tool->y[0],
measure_tool->x[i],
measure_tool->y[i]) > ARC_RADIUS)
{
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)
{
gimp_draw_tool_draw_arc_by_anchor (draw_tool,
FALSE,
measure_tool->x[0],
measure_tool->y[0],
ARC_RADIUS,
ARC_RADIUS,
angle1, angle2,
GTK_ANCHOR_CENTER,
FALSE);
if (measure_tool->num_points == 2)
{
GimpDisplayShell *shell;
gdouble target;
gdouble arc_radius;
shell = GIMP_DISPLAY_SHELL (tool->gdisp->shell);
target = FUNSCALEX (shell, (TARGET >> 1));
arc_radius = FUNSCALEX (shell, ARC_RADIUS);
gimp_draw_tool_draw_line
(draw_tool,
measure_tool->x[0],
measure_tool->y[0],
(measure_tool->x[1] >= measure_tool->x[0] ?
measure_tool->x[0] + arc_radius + target :
measure_tool->x[0] - arc_radius - target),
measure_tool->y[0],
FALSE);
}
}
}
}
static gdouble
measure_get_angle (gint dx,
gint dy,
gdouble xres,
gdouble yres)
{
gdouble angle;
if (dx)
angle = gimp_rad_to_deg (atan (((gdouble) (dy) / yres) /
((gdouble) (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_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;
}
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