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gimp/app/tools/gimpmagnifytool.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimpimage.h"
#include "widgets/gimphelp-ids.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "display/gimpdisplayshell-scale.h"
#include "gimpmagnifyoptions.h"
#include "gimpmagnifytool.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
static void gimp_magnify_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static void gimp_magnify_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display);
static void gimp_magnify_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static void gimp_magnify_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display);
static void gimp_magnify_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display);
static void gimp_magnify_tool_draw (GimpDrawTool *draw_tool);
G_DEFINE_TYPE (GimpMagnifyTool, gimp_magnify_tool, GIMP_TYPE_DRAW_TOOL)
#define parent_class gimp_magnify_tool_parent_class
void
gimp_magnify_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_MAGNIFY_TOOL,
GIMP_TYPE_MAGNIFY_OPTIONS,
gimp_magnify_options_gui,
0,
"gimp-zoom-tool",
_("Zoom"),
_("Zoom Tool: Adjust the zoom level"),
N_("tool|_Zoom"), "Z",
NULL, GIMP_HELP_TOOL_ZOOM,
GIMP_STOCK_TOOL_ZOOM,
data);
}
static void
gimp_magnify_tool_class_init (GimpMagnifyToolClass *klass)
{
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
GimpDrawToolClass *draw_tool_class = GIMP_DRAW_TOOL_CLASS (klass);
tool_class->button_press = gimp_magnify_tool_button_press;
tool_class->button_release = gimp_magnify_tool_button_release;
tool_class->motion = gimp_magnify_tool_motion;
tool_class->modifier_key = gimp_magnify_tool_modifier_key;
tool_class->cursor_update = gimp_magnify_tool_cursor_update;
draw_tool_class->draw = gimp_magnify_tool_draw;
}
static void
gimp_magnify_tool_init (GimpMagnifyTool *magnify_tool)
{
GimpTool *tool = GIMP_TOOL (magnify_tool);
magnify_tool->x = 0;
magnify_tool->y = 0;
magnify_tool->w = 0;
magnify_tool->h = 0;
gimp_tool_control_set_scroll_lock (tool->control, TRUE);
gimp_tool_control_set_handle_empty_image (tool->control, TRUE);
gimp_tool_control_set_wants_click (tool->control, TRUE);
gimp_tool_control_set_snap_to (tool->control, FALSE);
gimp_tool_control_set_cursor (tool->control,
GIMP_CURSOR_MOUSE);
gimp_tool_control_set_tool_cursor (tool->control,
GIMP_TOOL_CURSOR_ZOOM);
gimp_tool_control_set_cursor_modifier (tool->control,
GIMP_CURSOR_MODIFIER_PLUS);
gimp_tool_control_set_toggle_cursor_modifier (tool->control,
GIMP_CURSOR_MODIFIER_MINUS);
}
static void
gimp_magnify_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
GimpMagnifyTool *magnify = GIMP_MAGNIFY_TOOL (tool);
magnify->x = coords->x;
magnify->y = coords->y;
magnify->w = 0;
magnify->h = 0;
gimp_tool_control_activate (tool->control);
tool->display = display;
gimp_draw_tool_start (GIMP_DRAW_TOOL (tool), display);
}
static void
gimp_magnify_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display)
{
GimpMagnifyTool *magnify = GIMP_MAGNIFY_TOOL (tool);
GimpMagnifyOptions *options = GIMP_MAGNIFY_TOOL_GET_OPTIONS (tool);
GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (tool->display->shell);
gimp_draw_tool_stop (GIMP_DRAW_TOOL (tool));
gimp_tool_control_halt (tool->control);
if (release_type != GIMP_BUTTON_RELEASE_CANCEL)
{
gdouble x1, y1, x2, y2;
gdouble width, height;
gdouble current_scale;
gdouble new_scale;
x1 = (magnify->w < 0) ? magnify->x + magnify->w : magnify->x;
y1 = (magnify->h < 0) ? magnify->y + magnify->h : magnify->y;
width = (magnify->w < 0) ? -magnify->w : magnify->w;
height = (magnify->h < 0) ? -magnify->h : magnify->h;
x2 = x1 + width;
y2 = y1 + height;
width = MAX (1.0, width);
height = MAX (1.0, height);
current_scale = gimp_zoom_model_get_factor (shell->zoom);
if (release_type == GIMP_BUTTON_RELEASE_CLICK ||
release_type == GIMP_BUTTON_RELEASE_NO_MOTION)
{
new_scale = gimp_zoom_model_zoom_step (options->zoom_type,
current_scale);
}
else
{
gdouble display_width;
gdouble display_height;
gdouble factor = 1.0;
display_width = FUNSCALEX (shell, shell->disp_width);
display_height = FUNSCALEY (shell, shell->disp_height);
switch (options->zoom_type)
{
case GIMP_ZOOM_IN:
factor = MIN ((display_width / width),
(display_height / height));
break;
case GIMP_ZOOM_OUT:
factor = MAX ((width / display_width),
(height / display_height));
break;
default:
break;
}
new_scale = current_scale * factor;
}
if (new_scale != current_scale)
{
gint offset_x = 0;
gint offset_y = 0;
switch (options->zoom_type)
{
case GIMP_ZOOM_IN:
/* move the center of the rectangle to the center of the
* viewport:
*
* new_offset = center of rectangle in new scale screen coords
* including offset
* -
* center of viewport in screen coords without
* offset
*/
offset_x = RINT (new_scale * ((x1 + x2) / 2.0) *
SCREEN_XRES (shell) / display->image->xresolution
-
(shell->disp_width / 2.0));
offset_y = RINT (new_scale * ((y1 + y2) / 2.0) *
SCREEN_YRES (shell) / display->image->yresolution
-
(shell->disp_height / 2.0));
break;
case GIMP_ZOOM_OUT:
/* move the center of the viewport to the center of the
* rectangle:
*
* new_offset = center of viewport in new scale screen coords
* including offset
* -
* center of rectangle in screen coords without
* offset
*/
offset_x = RINT (new_scale * UNSCALEX (shell,
shell->offset_x +
shell->disp_width / 2.0) *
SCREEN_XRES (shell) / display->image->xresolution
-
(SCALEX (shell, (x1 + x2) / 2.0) -
shell->offset_x));
offset_y = RINT (new_scale * UNSCALEY (shell,
shell->offset_y +
shell->disp_height / 2.0) *
SCREEN_YRES (shell) / display->image->yresolution
-
(SCALEY (shell, (y1 + y2) / 2.0) -
shell->offset_y));
break;
default:
break;
}
gimp_display_shell_scale_by_values (shell,
new_scale,
offset_x, offset_y,
options->auto_resize);
}
}
}
static void
gimp_magnify_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
GimpMagnifyTool *magnify = GIMP_MAGNIFY_TOOL (tool);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
magnify->w = coords->x - magnify->x;
magnify->h = coords->y - magnify->y;
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
static void
gimp_magnify_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display)
{
GimpMagnifyOptions *options = GIMP_MAGNIFY_TOOL_GET_OPTIONS (tool);
if (key == GDK_CONTROL_MASK)
{
switch (options->zoom_type)
{
case GIMP_ZOOM_IN:
g_object_set (options, "zoom-type", GIMP_ZOOM_OUT, NULL);
break;
case GIMP_ZOOM_OUT:
g_object_set (options, "zoom-type", GIMP_ZOOM_IN, NULL);
break;
default:
break;
}
}
}
static void
gimp_magnify_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display)
{
GimpMagnifyOptions *options = GIMP_MAGNIFY_TOOL_GET_OPTIONS (tool);
gimp_tool_control_set_toggled (tool->control,
options->zoom_type == GIMP_ZOOM_OUT);
GIMP_TOOL_CLASS (parent_class)->cursor_update (tool, coords, state, display);
}
static void
gimp_magnify_tool_draw (GimpDrawTool *draw_tool)
{
GimpMagnifyTool *magnify = GIMP_MAGNIFY_TOOL (draw_tool);
gimp_draw_tool_draw_rectangle (draw_tool,
FALSE,
magnify->x,
magnify->y,
magnify->w,
magnify->h,
FALSE);
}
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