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gimp/app/tools/gimpmagnifytool.c

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/* The GIMP -- an 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 <stdlib.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "config/gimpdisplayconfig.h"
#include "core/gimp.h"
#include "core/gimpimage.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "display/gimpdisplayshell-scale.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimpwidgets-utils.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,
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_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,
GimpDisplay *display)
{
GimpMagnifyTool *magnify = GIMP_MAGNIFY_TOOL (tool);
GimpMagnifyOptions *options = GIMP_MAGNIFY_TOOL_GET_OPTIONS (tool);
GimpDisplayShell *shell;
gdouble current;
shell = GIMP_DISPLAY_SHELL (tool->display->shell);
gimp_draw_tool_stop (GIMP_DRAW_TOOL (tool));
gimp_tool_control_halt (tool->control);
/* First take care of the case where the user "cancels" the action */
if (! (state & GDK_BUTTON3_MASK))
{
gint x1, y1, x2, y2, w, h;
gint win_width, win_height;
gint offset_x, offset_y;
gdouble new_scale;
x1 = (magnify->w < 0) ? magnify->x + magnify->w : magnify->x;
y1 = (magnify->h < 0) ? magnify->y + magnify->h : magnify->y;
w = (magnify->w < 0) ? -magnify->w : magnify->w;
h = (magnify->h < 0) ? -magnify->h : magnify->h;
x2 = x1 + w;
y2 = y1 + h;
win_width = shell->disp_width;
win_height = shell->disp_height;
current = gimp_zoom_model_get_factor (shell->zoom);
/* we need to compute the mouse movement in screen coordinates */
if ((SCALEX (shell, w) < options->threshold) ||
(SCALEY (shell, h) < options->threshold))
{
new_scale = gimp_zoom_model_zoom_step (options->zoom_type, current);
}
else
{
gint width, height;
gdouble scale = 1.0;
width = UNSCALEX (shell, win_width);
height = UNSCALEY (shell, win_height);
switch (options->zoom_type)
{
case GIMP_ZOOM_IN:
scale = MIN (((gdouble) width / (gdouble) w),
((gdouble) height / (gdouble) h));
break;
case GIMP_ZOOM_OUT:
scale = MIN (((gdouble) w / (gdouble) width),
((gdouble) h / (gdouble) height));
break;
default:
break;
}
new_scale = current * scale;
}
offset_x = (new_scale * ((x1 + x2) / 2)
* SCREEN_XRES (shell) / display->image->xresolution
- (win_width / 2));
offset_y = (new_scale * ((y1 + y2) / 2)
* SCREEN_YRES (shell) / display->image->yresolution
- (win_height / 2));
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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