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gimp/app/widgets/gimpgradienteditor.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Gradient editor module copyight (C) 1996-1997 Federico Mena Quintero
* federico@nuclecu.unam.mx
*
* 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 3 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 PURIGHTE. 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, see <http://www.gnu.org/licenses/>.
*/
/* Special thanks to:
*
* Luis Albarran (luis4@mindspring.com) - Nice UI suggestions
*
* Miguel de Icaza (miguel@nuclecu.unam.mx) - Pop-up menu suggestion
*
* Marcelo Malheiros (malheiro@dca.fee.unicamp.br) - many, many
* suggestions, nice gradient files
*
* Adam Moss (adam@uunet.pipex.com) - idea for the hint bar
*
* Everyone on #gimp - many suggestions
*/
/* TODO:
*
* - Add all of Marcelo's neat suggestions:
* - Hue rotate, saturation, brightness, contrast.
*
* - Better handling of bogus gradient files and inconsistent
* segments. Do not loop indefinitely in seg_get_segment_at() if
* there is a missing segment between two others.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimp.h"
#include "core/gimpcontainer.h"
#include "core/gimpcontext.h"
#include "core/gimpdatafactory.h"
#include "core/gimpgradient.h"
#include "gimpdnd.h"
#include "gimpdocked.h"
#include "gimpgradienteditor.h"
#include "gimphelp-ids.h"
#include "gimpview.h"
#include "gimpviewrenderergradient.h"
#include "gimpwidgets-utils.h"
#include "gimp-intl.h"
#define EPSILON 1e-10
#define GRAD_SCROLLBAR_STEP_SIZE 0.05
#define GRAD_SCROLLBAR_PAGE_SIZE 0.75
#define GRAD_VIEW_SIZE 96
#define GRAD_CONTROL_HEIGHT 14
#define GRAD_CURRENT_COLOR_WIDTH 16
#define GRAD_MOVE_TIME 150 /* ms between mouse click and detection of movement in gradient control */
#define GRAD_VIEW_EVENT_MASK (GDK_EXPOSURE_MASK | \
GDK_LEAVE_NOTIFY_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK)
#define GRAD_CONTROL_EVENT_MASK (GDK_EXPOSURE_MASK | \
GDK_LEAVE_NOTIFY_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON1_MOTION_MASK)
/* local function prototypes */
static void gimp_gradient_editor_docked_iface_init (GimpDockedInterface *face);
static void gimp_gradient_editor_constructed (GObject *object);
static void gimp_gradient_editor_dispose (GObject *object);
static void gimp_gradient_editor_unmap (GtkWidget *widget);
static void gimp_gradient_editor_set_data (GimpDataEditor *editor,
GimpData *data);
static void gimp_gradient_editor_set_context (GimpDocked *docked,
GimpContext *context);
static void gimp_gradient_editor_gradient_dirty (GimpGradientEditor *editor,
GimpGradient *gradient);
static void gradient_editor_drop_gradient (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data);
static void gradient_editor_drop_color (GtkWidget *widget,
gint x,
gint y,
const GimpRGB *color,
gpointer data);
static void gradient_editor_control_drop_color (GtkWidget *widget,
gint x,
gint y,
const GimpRGB *color,
gpointer data);
static void gradient_editor_scrollbar_update (GtkAdjustment *adj,
GimpGradientEditor *editor);
static void gradient_editor_set_hint (GimpGradientEditor *editor,
const gchar *str1,
const gchar *str2,
const gchar *str3,
const gchar *str4);
/* Gradient view functions */
static gboolean view_events (GtkWidget *widget,
GdkEvent *event,
GimpGradientEditor *editor);
static void view_set_hint (GimpGradientEditor *editor,
gint x);
static void view_pick_color (GimpGradientEditor *editor,
GimpColorPickMode mode,
gint x);
/* Gradient control functions */
static gboolean control_events (GtkWidget *widget,
GdkEvent *event,
GimpGradientEditor *editor);
static gboolean control_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpGradientEditor *editor);
static void control_do_hint (GimpGradientEditor *editor,
gint x,
gint y);
static void control_button_press (GimpGradientEditor *editor,
gint x,
gint y,
guint button,
guint state);
static gboolean control_point_in_handle (GimpGradientEditor *editor,
GimpGradient *gradient,
gint x,
gint y,
GimpGradientSegment *seg,
GradientEditorDragMode handle);
static void control_select_single_segment (GimpGradientEditor *editor,
GimpGradientSegment *seg);
static void control_extend_selection (GimpGradientEditor *editor,
GimpGradientSegment *seg,
gdouble pos);
static void control_motion (GimpGradientEditor *editor,
GimpGradient *gradient,
gint x);
static void control_compress_left (GimpGradient *gradient,
GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
GimpGradientSegment *drag_seg,
gdouble pos);
static double control_move (GimpGradientEditor *editor,
GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
gdouble delta);
/* Control update/redraw functions */
static void control_update (GimpGradientEditor *editor,
GimpGradient *gradient,
gboolean recalculate);
static void control_draw (GimpGradientEditor *editor,
GimpGradient *gradient,
cairo_t *cr,
gint width,
gint height,
gdouble left,
gdouble right);
static void control_draw_normal_handle (GimpGradientEditor *editor,
cairo_t *cr,
gdouble pos,
gint height,
gboolean selected);
static void control_draw_middle_handle (GimpGradientEditor *editor,
cairo_t *cr,
gdouble pos,
gint height,
gboolean selected);
static void control_draw_handle (cairo_t *cr,
GdkColor *border,
GdkColor *fill,
gint xpos,
gint height);
static gint control_calc_p_pos (GimpGradientEditor *editor,
gdouble pos);
static gdouble control_calc_g_pos (GimpGradientEditor *editor,
gint pos);
/* Segment functions */
static void seg_get_closest_handle (GimpGradient *grad,
gdouble pos,
GimpGradientSegment **seg,
GradientEditorDragMode *handle);
static gboolean seg_in_selection (GimpGradient *grad,
GimpGradientSegment *seg,
GimpGradientSegment *left,
GimpGradientSegment *right);
static GtkWidget * gradient_hint_label_add (GtkBox *box);
G_DEFINE_TYPE_WITH_CODE (GimpGradientEditor, gimp_gradient_editor,
GIMP_TYPE_DATA_EDITOR,
G_IMPLEMENT_INTERFACE (GIMP_TYPE_DOCKED,
gimp_gradient_editor_docked_iface_init))
#define parent_class gimp_gradient_editor_parent_class
static GimpDockedInterface *parent_docked_iface = NULL;
static void
gimp_gradient_editor_class_init (GimpGradientEditorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GimpDataEditorClass *editor_class = GIMP_DATA_EDITOR_CLASS (klass);
object_class->constructed = gimp_gradient_editor_constructed;
object_class->dispose = gimp_gradient_editor_dispose;
widget_class->unmap = gimp_gradient_editor_unmap;
editor_class->set_data = gimp_gradient_editor_set_data;
editor_class->title = _("Gradient Editor");
}
static void
gimp_gradient_editor_docked_iface_init (GimpDockedInterface *iface)
{
parent_docked_iface = g_type_interface_peek_parent (iface);
if (! parent_docked_iface)
parent_docked_iface = g_type_default_interface_peek (GIMP_TYPE_DOCKED);
iface->set_context = gimp_gradient_editor_set_context;
}
static void
gimp_gradient_editor_init (GimpGradientEditor *editor)
{
GimpDataEditor *data_editor = GIMP_DATA_EDITOR (editor);
GtkWidget *frame;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *hint_vbox;
GimpRGB transp;
gimp_rgba_set (&transp, 0.0, 0.0, 0.0, 0.0);
/* Frame for gradient view and gradient control */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (editor), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (frame), vbox);
gtk_widget_show (vbox);
/* Gradient view */
editor->view_last_x = 0;
editor->view_button_down = FALSE;
data_editor->view = gimp_view_new_full_by_types (NULL,
GIMP_TYPE_VIEW,
GIMP_TYPE_GRADIENT,
GRAD_VIEW_SIZE,
GRAD_VIEW_SIZE, 0,
FALSE, FALSE, FALSE);
gtk_widget_set_size_request (data_editor->view, -1, GRAD_VIEW_SIZE);
gtk_widget_set_events (data_editor->view, GRAD_VIEW_EVENT_MASK);
gimp_view_set_expand (GIMP_VIEW (data_editor->view), TRUE);
gtk_box_pack_start (GTK_BOX (vbox), data_editor->view, TRUE, TRUE, 0);
gtk_widget_show (data_editor->view);
g_signal_connect (data_editor->view, "event",
G_CALLBACK (view_events),
editor);
gimp_dnd_viewable_dest_add (GTK_WIDGET (data_editor->view),
GIMP_TYPE_GRADIENT,
gradient_editor_drop_gradient,
editor);
gimp_dnd_color_dest_add (GTK_WIDGET (data_editor->view),
gradient_editor_drop_color,
editor);
/* Gradient control */
editor->control_drag_segment = NULL;
editor->control_sel_l = NULL;
editor->control_sel_r = NULL;
editor->control_drag_mode = GRAD_DRAG_NONE;
editor->control_click_time = 0;
editor->control_compress = FALSE;
editor->control_last_x = 0;
editor->control_last_gx = 0.0;
editor->control_orig_pos = 0.0;
editor->control = gtk_drawing_area_new ();
gtk_widget_set_size_request (editor->control, -1, GRAD_CONTROL_HEIGHT);
gtk_widget_set_events (editor->control, GRAD_CONTROL_EVENT_MASK);
gtk_box_pack_start (GTK_BOX (vbox), editor->control, FALSE, FALSE, 0);
gtk_widget_show (editor->control);
g_signal_connect (editor->control, "event",
G_CALLBACK (control_events),
editor);
g_signal_connect (editor->control, "expose-event",
G_CALLBACK (control_expose),
editor);
gimp_dnd_color_dest_add (GTK_WIDGET (editor->control),
gradient_editor_control_drop_color,
editor);
/* Scrollbar */
editor->zoom_factor = 1;
editor->scroll_data = gtk_adjustment_new (0.0, 0.0, 1.0,
GRAD_SCROLLBAR_STEP_SIZE,
GRAD_SCROLLBAR_PAGE_SIZE,
1.0);
g_signal_connect (editor->scroll_data, "value-changed",
G_CALLBACK (gradient_editor_scrollbar_update),
editor);
g_signal_connect (editor->scroll_data, "changed",
G_CALLBACK (gradient_editor_scrollbar_update),
editor);
editor->scrollbar = gtk_hscrollbar_new (GTK_ADJUSTMENT (editor->scroll_data));
gtk_box_pack_start (GTK_BOX (editor), editor->scrollbar, FALSE, FALSE, 0);
gtk_widget_show (editor->scrollbar);
/* Box for current color and the hint labels */
hbox = gtk_hbox_new (FALSE, 2);
gtk_box_pack_start (GTK_BOX (editor), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
/* Frame showing current active color */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (hbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
editor->current_color = gimp_color_area_new (&transp,
GIMP_COLOR_AREA_SMALL_CHECKS,
GDK_BUTTON1_MASK |
GDK_BUTTON2_MASK);
gtk_container_add (GTK_CONTAINER (frame), editor->current_color);
gtk_widget_set_size_request (editor->current_color,
GRAD_CURRENT_COLOR_WIDTH, -1);
gtk_widget_show (editor->current_color);
/* Hint box */
hint_vbox = gtk_vbox_new (FALSE, 0);
gtk_box_pack_start (GTK_BOX (hbox), hint_vbox, TRUE, TRUE, 0);
gtk_widget_show (hint_vbox);
editor->hint_label1 = gradient_hint_label_add (GTK_BOX (hint_vbox));
editor->hint_label2 = gradient_hint_label_add (GTK_BOX (hint_vbox));
editor->hint_label3 = gradient_hint_label_add (GTK_BOX (hint_vbox));
editor->hint_label4 = gradient_hint_label_add (GTK_BOX (hint_vbox));
/* Initialize other data */
editor->left_saved_segments = NULL;
editor->left_saved_dirty = FALSE;
editor->right_saved_segments = NULL;
editor->right_saved_dirty = FALSE;
/* Black, 50% Gray, White, Clear */
gimp_rgba_set (&editor->saved_colors[0], 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[1], 0.5, 0.5, 0.5, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[2], 1.0, 1.0, 1.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[3], 0.0, 0.0, 0.0, GIMP_OPACITY_TRANSPARENT);
/* Red, Yellow, Green, Cyan, Blue, Magenta */
gimp_rgba_set (&editor->saved_colors[4], 1.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[5], 1.0, 1.0, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[6], 0.0, 1.0, 0.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[7], 0.0, 1.0, 1.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[8], 0.0, 0.0, 1.0, GIMP_OPACITY_OPAQUE);
gimp_rgba_set (&editor->saved_colors[9], 1.0, 0.0, 1.0, GIMP_OPACITY_OPAQUE);
}
static void
gimp_gradient_editor_constructed (GObject *object)
{
GimpGradientEditor *editor = GIMP_GRADIENT_EDITOR (object);
if (G_OBJECT_CLASS (parent_class)->constructed)
G_OBJECT_CLASS (parent_class)->constructed (object);
gimp_editor_add_action_button (GIMP_EDITOR (editor), "gradient-editor",
"gradient-editor-zoom-out", NULL);
gimp_editor_add_action_button (GIMP_EDITOR (editor), "gradient-editor",
"gradient-editor-zoom-in", NULL);
gimp_editor_add_action_button (GIMP_EDITOR (editor), "gradient-editor",
"gradient-editor-zoom-all", NULL);
}
static void
gimp_gradient_editor_dispose (GObject *object)
{
GimpGradientEditor *editor = GIMP_GRADIENT_EDITOR (object);
if (editor->color_dialog)
gtk_dialog_response (GTK_DIALOG (editor->color_dialog),
GTK_RESPONSE_CANCEL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_gradient_editor_unmap (GtkWidget *widget)
{
GimpGradientEditor *editor = GIMP_GRADIENT_EDITOR (widget);
if (editor->color_dialog)
gtk_dialog_response (GTK_DIALOG (editor->color_dialog),
GTK_RESPONSE_CANCEL);
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}
static void
gimp_gradient_editor_set_data (GimpDataEditor *editor,
GimpData *data)
{
GimpGradientEditor *gradient_editor = GIMP_GRADIENT_EDITOR (editor);
GimpData *old_data;
if (gradient_editor->color_dialog)
gtk_dialog_response (GTK_DIALOG (gradient_editor->color_dialog),
GTK_RESPONSE_CANCEL);
old_data = gimp_data_editor_get_data (editor);
if (old_data)
g_signal_handlers_disconnect_by_func (old_data,
gimp_gradient_editor_gradient_dirty,
gradient_editor);
GIMP_DATA_EDITOR_CLASS (parent_class)->set_data (editor, data);
if (data)
g_signal_connect_swapped (data, "dirty",
G_CALLBACK (gimp_gradient_editor_gradient_dirty),
gradient_editor);
gimp_view_set_viewable (GIMP_VIEW (editor->view),
GIMP_VIEWABLE (data));
control_update (gradient_editor, GIMP_GRADIENT (data), TRUE);
}
static void
gimp_gradient_editor_set_context (GimpDocked *docked,
GimpContext *context)
{
GimpDataEditor *data_editor = GIMP_DATA_EDITOR (docked);
parent_docked_iface->set_context (docked, context);
gimp_view_renderer_set_context (GIMP_VIEW (data_editor->view)->renderer,
context);
}
/* public functions */
GtkWidget *
gimp_gradient_editor_new (GimpContext *context,
GimpMenuFactory *menu_factory)
{
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
return g_object_new (GIMP_TYPE_GRADIENT_EDITOR,
"menu-factory", menu_factory,
"menu-identifier", "<GradientEditor>",
"ui-path", "/gradient-editor-popup",
"data-factory", context->gimp->gradient_factory,
"context", context,
"data", gimp_context_get_gradient (context),
NULL);
}
void
gimp_gradient_editor_update (GimpGradientEditor *editor)
{
GimpGradient *gradient = NULL;
g_return_if_fail (GIMP_IS_GRADIENT_EDITOR (editor));
if (GIMP_DATA_EDITOR (editor)->data)
gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
control_update (editor, gradient, FALSE);
}
void
gimp_gradient_editor_zoom (GimpGradientEditor *editor,
GimpZoomType zoom_type)
{
GtkAdjustment *adjustment;
gdouble old_value;
gdouble old_page_size;
gdouble value = 0.0;
gdouble page_size = 1.0;
g_return_if_fail (GIMP_IS_GRADIENT_EDITOR (editor));
adjustment = GTK_ADJUSTMENT (editor->scroll_data);
old_value = gtk_adjustment_get_value (adjustment);
old_page_size = gtk_adjustment_get_page_size (adjustment);
switch (zoom_type)
{
case GIMP_ZOOM_IN_MAX:
case GIMP_ZOOM_IN_MORE:
case GIMP_ZOOM_IN:
editor->zoom_factor++;
page_size = 1.0 / editor->zoom_factor;
value = old_value + (old_page_size - page_size) / 2.0;
break;
case GIMP_ZOOM_OUT_MORE:
case GIMP_ZOOM_OUT:
if (editor->zoom_factor <= 1)
return;
editor->zoom_factor--;
page_size = 1.0 / editor->zoom_factor;
value = old_value - (page_size - old_page_size) / 2.0;
if (value < 0.0)
value = 0.0;
else if ((value + page_size) > 1.0)
value = 1.0 - page_size;
break;
case GIMP_ZOOM_OUT_MAX:
case GIMP_ZOOM_TO: /* abused as ZOOM_ALL */
editor->zoom_factor = 1;
value = 0.0;
page_size = 1.0;
break;
}
gtk_adjustment_configure (adjustment,
value,
gtk_adjustment_get_lower (adjustment),
gtk_adjustment_get_upper (adjustment),
page_size * GRAD_SCROLLBAR_STEP_SIZE,
page_size * GRAD_SCROLLBAR_PAGE_SIZE,
page_size);
}
/* private functions */
static void
gimp_gradient_editor_gradient_dirty (GimpGradientEditor *editor,
GimpGradient *gradient)
{
GimpGradientSegment *segment;
gboolean left_seen = FALSE;
gboolean right_seen = FALSE;
for (segment = gradient->segments; segment; segment = segment->next)
{
if (segment == editor->control_sel_l)
left_seen = TRUE;
if (segment == editor->control_sel_r)
right_seen = TRUE;
if (right_seen && ! left_seen)
{
GimpGradientSegment *tmp;
tmp = editor->control_sel_l;
editor->control_sel_l = editor->control_sel_r;
editor->control_sel_r = tmp;
right_seen = FALSE;
left_seen = TRUE;
}
}
control_update (editor, gradient, ! (left_seen && right_seen));
}
static void
gradient_editor_drop_gradient (GtkWidget *widget,
gint x,
gint y,
GimpViewable *viewable,
gpointer data)
{
gimp_data_editor_set_data (GIMP_DATA_EDITOR (data), GIMP_DATA (viewable));
}
static void
gradient_editor_drop_color (GtkWidget *widget,
gint x,
gint y,
const GimpRGB *color,
gpointer data)
{
GimpGradientEditor *editor = GIMP_GRADIENT_EDITOR (data);
GimpGradient *gradient;
gdouble xpos;
GimpGradientSegment *seg, *lseg, *rseg;
gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
xpos = control_calc_g_pos (editor, x);
seg = gimp_gradient_get_segment_at (gradient, xpos);
gimp_data_freeze (GIMP_DATA (gradient));
gimp_gradient_segment_split_midpoint (gradient,
GIMP_DATA_EDITOR (editor)->context,
seg, &lseg, &rseg);
if (lseg)
{
lseg->right = xpos;
lseg->middle = (lseg->left + lseg->right) / 2.0;
lseg->right_color = *color;
}
if (rseg)
{
rseg->left = xpos;
rseg->middle = (rseg->left + rseg->right) / 2.0;
rseg->left_color = *color;
}
gimp_data_thaw (GIMP_DATA (gradient));
}
static void
gradient_editor_control_drop_color (GtkWidget *widget,
gint x,
gint y,
const GimpRGB *color,
gpointer data)
{
GimpGradientEditor *editor = GIMP_GRADIENT_EDITOR (data);
GimpGradient *gradient;
gdouble xpos;
GimpGradientSegment *seg, *lseg, *rseg;
GradientEditorDragMode handle;
gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
xpos = control_calc_g_pos (editor, x);
seg_get_closest_handle (gradient, xpos, &seg, &handle);
if (seg)
{
if (handle == GRAD_DRAG_LEFT)
{
lseg = seg->prev;
rseg = seg;
}
else
return;
}
else
{
lseg = gimp_gradient_get_segment_at (gradient, xpos);
rseg = NULL;
}
gimp_data_freeze (GIMP_DATA (gradient));
if (lseg)
lseg->right_color = *color;
if (rseg)
rseg->left_color = *color;
gimp_data_thaw (GIMP_DATA (gradient));
}
static void
gradient_editor_scrollbar_update (GtkAdjustment *adjustment,
GimpGradientEditor *editor)
{
GimpDataEditor *data_editor = GIMP_DATA_EDITOR (editor);
GimpViewRendererGradient *renderer;
gchar *str1;
gchar *str2;
str1 = g_strdup_printf (_("Zoom factor: %d:1"),
editor->zoom_factor);
str2 = g_strdup_printf (_("Displaying [%0.4f, %0.4f]"),
gtk_adjustment_get_value (adjustment),
gtk_adjustment_get_value (adjustment) +
gtk_adjustment_get_page_size (adjustment));
gradient_editor_set_hint (editor, str1, str2, NULL, NULL);
g_free (str1);
g_free (str2);
renderer = GIMP_VIEW_RENDERER_GRADIENT (GIMP_VIEW (data_editor->view)->renderer);
gimp_view_renderer_gradient_set_offsets (renderer,
gtk_adjustment_get_value (adjustment),
gtk_adjustment_get_value (adjustment) +
gtk_adjustment_get_page_size (adjustment));
gimp_view_renderer_update (GIMP_VIEW_RENDERER (renderer));
gimp_gradient_editor_update (editor);
}
static void
gradient_editor_set_hint (GimpGradientEditor *editor,
const gchar *str1,
const gchar *str2,
const gchar *str3,
const gchar *str4)
{
gtk_label_set_text (GTK_LABEL (editor->hint_label1), str1);
gtk_label_set_text (GTK_LABEL (editor->hint_label2), str2);
gtk_label_set_text (GTK_LABEL (editor->hint_label3), str3);
gtk_label_set_text (GTK_LABEL (editor->hint_label4), str4);
}
/***** Gradient view functions *****/
static gboolean
view_events (GtkWidget *widget,
GdkEvent *event,
GimpGradientEditor *editor)
{
GimpDataEditor *data_editor = GIMP_DATA_EDITOR (editor);
if (! data_editor->data)
return TRUE;
switch (event->type)
{
case GDK_LEAVE_NOTIFY:
gradient_editor_set_hint (editor, NULL, NULL, NULL, NULL);
break;
case GDK_MOTION_NOTIFY:
{
GdkEventMotion *mevent = (GdkEventMotion *) event;
if (mevent->x != editor->view_last_x)
{
editor->view_last_x = mevent->x;
if (editor->view_button_down)
{
view_pick_color (editor,
(mevent->state & GDK_CONTROL_MASK) ?
GIMP_COLOR_PICK_MODE_BACKGROUND :
GIMP_COLOR_PICK_MODE_FOREGROUND,
mevent->x);
}
else
{
view_set_hint (editor, mevent->x);
}
}
gdk_event_request_motions (mevent);
}
break;
case GDK_BUTTON_PRESS:
{
GdkEventButton *bevent = (GdkEventButton *) event;
switch (bevent->button)
{
case 1:
editor->view_last_x = bevent->x;
editor->view_button_down = TRUE;
view_pick_color (editor,
(bevent->state & GDK_CONTROL_MASK) ?
GIMP_COLOR_PICK_MODE_BACKGROUND :
GIMP_COLOR_PICK_MODE_FOREGROUND,
bevent->x);
break;
case 3:
gimp_editor_popup_menu (GIMP_EDITOR (editor), NULL, NULL);
break;
default:
break;
}
}
break;
case GDK_SCROLL:
{
GdkEventScroll *sevent = (GdkEventScroll *) event;
if (sevent->state & GDK_CONTROL_MASK)
{
switch (sevent->direction)
{
case GDK_SCROLL_UP:
gimp_gradient_editor_zoom (editor, GIMP_ZOOM_IN);
break;
case GDK_SCROLL_DOWN:
gimp_gradient_editor_zoom (editor, GIMP_ZOOM_OUT);
break;
default:
break;
}
}
else
{
GtkAdjustment *adj = GTK_ADJUSTMENT (editor->scroll_data);
gfloat value = gtk_adjustment_get_value (adj);
switch (sevent->direction)
{
case GDK_SCROLL_UP:
value -= gtk_adjustment_get_page_increment (adj) / 2;
break;
case GDK_SCROLL_DOWN:
value += gtk_adjustment_get_page_increment (adj) / 2;
break;
default:
break;
}
value = CLAMP (value,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, value);
}
}
break;
case GDK_BUTTON_RELEASE:
if (editor->view_button_down)
{
GdkEventButton *bevent = (GdkEventButton *) event;
editor->view_last_x = bevent->x;
editor->view_button_down = FALSE;
view_pick_color (editor,
(bevent->state & GDK_CONTROL_MASK) ?
GIMP_COLOR_PICK_MODE_BACKGROUND :
GIMP_COLOR_PICK_MODE_FOREGROUND,
bevent->x);
break;
}
break;
default:
return FALSE;
}
return TRUE;
}
static void
view_set_hint (GimpGradientEditor *editor,
gint x)
{
GimpDataEditor *data_editor = GIMP_DATA_EDITOR (editor);
GimpRGB rgb;
GimpHSV hsv;
gdouble xpos;
gchar *str1;
gchar *str2;
gchar *str3;
gchar *str4;
xpos = control_calc_g_pos (editor, x);
gimp_gradient_get_color_at (GIMP_GRADIENT (data_editor->data),
data_editor->context, NULL,
xpos, FALSE, &rgb);
gimp_color_area_set_color (GIMP_COLOR_AREA (editor->current_color), &rgb);
gimp_rgb_to_hsv (&rgb, &hsv);
str1 = g_strdup_printf (_("Position: %0.4f"), xpos);
str2 = g_strdup_printf (_("RGB (%0.3f, %0.3f, %0.3f)"),
rgb.r, rgb.g, rgb.b);
str3 = g_strdup_printf (_("HSV (%0.1f, %0.1f, %0.1f)"),
hsv.h * 360.0, hsv.s * 100.0, hsv.v * 100.0);
str4 = g_strdup_printf (_("Luminance: %0.1f Opacity: %0.1f"),
GIMP_RGB_LUMINANCE (rgb.r, rgb.g, rgb.b) * 100.0,
rgb.a * 100.0);
gradient_editor_set_hint (editor, str1, str2, str3, str4);
g_free (str1);
g_free (str2);
g_free (str3);
g_free (str4);
}
static void
view_pick_color (GimpGradientEditor *editor,
GimpColorPickMode mode,
gint x)
{
GimpDataEditor *data_editor = GIMP_DATA_EDITOR (editor);
GimpRGB color;
gdouble xpos;
gchar *str2;
gchar *str3;
xpos = control_calc_g_pos (editor, x);
gimp_gradient_get_color_at (GIMP_GRADIENT (data_editor->data),
data_editor->context, NULL,
xpos, FALSE, &color);
gimp_color_area_set_color (GIMP_COLOR_AREA (editor->current_color), &color);
str2 = g_strdup_printf (_("RGB (%d, %d, %d)"),
(gint) (color.r * 255.0),
(gint) (color.g * 255.0),
(gint) (color.b * 255.0));
str3 = g_strdup_printf ("(%0.3f, %0.3f, %0.3f)", color.r, color.g, color.b);
if (mode == GIMP_COLOR_PICK_MODE_FOREGROUND)
{
gimp_context_set_foreground (data_editor->context, &color);
gradient_editor_set_hint (editor, _("Foreground color set to:"),
str2, str3, NULL);
}
else
{
gimp_context_set_background (data_editor->context, &color);
gradient_editor_set_hint (editor, _("Background color set to:"),
str2, str3, NULL);
}
g_free (str2);
g_free (str3);
}
/***** Gradient control functions *****/
static gboolean
control_events (GtkWidget *widget,
GdkEvent *event,
GimpGradientEditor *editor)
{
GimpGradient *gradient;
GimpGradientSegment *seg;
if (! GIMP_DATA_EDITOR (editor)->data)
return TRUE;
gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
switch (event->type)
{
case GDK_LEAVE_NOTIFY:
gradient_editor_set_hint (editor, NULL, NULL, NULL, NULL);
break;
case GDK_BUTTON_PRESS:
if (editor->control_drag_mode == GRAD_DRAG_NONE)
{
GdkEventButton *bevent = (GdkEventButton *) event;
editor->control_last_x = bevent->x;
editor->control_click_time = bevent->time;
control_button_press (editor,
bevent->x, bevent->y,
bevent->button, bevent->state);
if (editor->control_drag_mode != GRAD_DRAG_NONE)
{
gtk_grab_add (widget);
if (GIMP_DATA_EDITOR (editor)->data_editable)
{
g_signal_handlers_block_by_func (gradient,
gimp_gradient_editor_gradient_dirty,
editor);
}
}
}
break;
case GDK_SCROLL:
{
GdkEventScroll *sevent = (GdkEventScroll *) event;
if (sevent->state & GDK_SHIFT_MASK)
{
if (sevent->direction == GDK_SCROLL_UP)
gimp_gradient_editor_zoom (editor, GIMP_ZOOM_IN);
else
gimp_gradient_editor_zoom (editor, GIMP_ZOOM_OUT);
}
else
{
GtkAdjustment *adj = GTK_ADJUSTMENT (editor->scroll_data);
gfloat new_value;
new_value = (gtk_adjustment_get_value (adj) +
((sevent->direction == GDK_SCROLL_UP) ?
- gtk_adjustment_get_page_increment (adj) / 2 :
gtk_adjustment_get_page_increment (adj) / 2));
new_value = CLAMP (new_value,
gtk_adjustment_get_lower (adj),
gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_page_size (adj));
gtk_adjustment_set_value (adj, new_value);
}
}
break;
case GDK_BUTTON_RELEASE:
{
GdkEventButton *bevent = (GdkEventButton *) event;
gradient_editor_set_hint (editor, NULL, NULL, NULL, NULL);
if (editor->control_drag_mode != GRAD_DRAG_NONE)
{
if (GIMP_DATA_EDITOR (editor)->data_editable)
{
g_signal_handlers_unblock_by_func (gradient,
gimp_gradient_editor_gradient_dirty,
editor);
}
gtk_grab_remove (widget);
if ((bevent->time - editor->control_click_time) >= GRAD_MOVE_TIME)
{
/* stuff was done in motion */
}
else if ((editor->control_drag_mode == GRAD_DRAG_MIDDLE) ||
(editor->control_drag_mode == GRAD_DRAG_ALL))
{
seg = editor->control_drag_segment;
if ((editor->control_drag_mode == GRAD_DRAG_ALL) &&
editor->control_compress)
{
control_extend_selection (editor, seg,
control_calc_g_pos (editor,
bevent->x));
}
else
{
control_select_single_segment (editor, seg);
}
gimp_gradient_editor_update (editor);
}
editor->control_drag_mode = GRAD_DRAG_NONE;
editor->control_compress = FALSE;
control_do_hint (editor, bevent->x, bevent->y);
}
}
break;
case GDK_MOTION_NOTIFY:
{
GdkEventMotion *mevent = (GdkEventMotion *) event;
if (mevent->x != editor->control_last_x)
{
editor->control_last_x = mevent->x;
if (GIMP_DATA_EDITOR (editor)->data_editable &&
editor->control_drag_mode != GRAD_DRAG_NONE)
{
if ((mevent->time - editor->control_click_time) >= GRAD_MOVE_TIME)
control_motion (editor, gradient, mevent->x);
}
else
{
gimp_gradient_editor_update (editor);
control_do_hint (editor, mevent->x, mevent->y);
}
}
gdk_event_request_motions (mevent);
}
break;
default:
return FALSE;
}
return TRUE;
}
static gboolean
control_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpGradientEditor *editor)
{
GtkAdjustment *adj = GTK_ADJUSTMENT (editor->scroll_data);
cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
GtkAllocation allocation;
gtk_widget_get_allocation (widget, &allocation);
control_draw (editor,
GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data),
cr,
allocation.width,
allocation.height,
gtk_adjustment_get_value (adj),
gtk_adjustment_get_value (adj) +
gtk_adjustment_get_page_size (adj));
cairo_destroy (cr);
return TRUE;
}
static void
control_do_hint (GimpGradientEditor *editor,
gint x,
gint y)
{
GimpGradient *gradient;
GimpGradientSegment *seg;
GradientEditorDragMode handle;
gboolean in_handle;
gdouble pos;
gchar *str;
gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
pos = control_calc_g_pos (editor, x);
if ((pos < 0.0) || (pos > 1.0))
return;
seg_get_closest_handle (gradient, pos, &seg, &handle);
in_handle = control_point_in_handle (editor, gradient,
x, y, seg, handle);
if (in_handle)
{
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg != NULL)
{
if (seg->prev != NULL)
{
str = g_strdup_printf (_("%s%sDrag: move & compress"),
gimp_get_mod_string (GDK_SHIFT_MASK),
gimp_get_mod_separator ());
gradient_editor_set_hint (editor,
NULL,
_("Drag: move"),
str,
NULL);
g_free (str);
}
else
{
str = g_strdup_printf (_("%s%sClick: extend selection"),
gimp_get_mod_string (GDK_SHIFT_MASK),
gimp_get_mod_separator ());
gradient_editor_set_hint (editor,
NULL,
_("Click: select"),
str,
NULL);
g_free (str);
}
}
else
{
str = g_strdup_printf (_("%s%sClick: extend selection"),
gimp_get_mod_string (GDK_SHIFT_MASK),
gimp_get_mod_separator ());
gradient_editor_set_hint (editor,
NULL,
_("Click: select"),
str,
NULL);
g_free (str);
}
break;
case GRAD_DRAG_MIDDLE:
str = g_strdup_printf (_("%s%sClick: extend selection"),
gimp_get_mod_string (GDK_SHIFT_MASK),
gimp_get_mod_separator ());
gradient_editor_set_hint (editor,
NULL,
_("Click: select Drag: move"),
str,
NULL);
g_free (str);
break;
default:
g_warning ("%s: in_handle is true, but received handle type %d.",
G_STRFUNC, in_handle);
break;
}
}
else
{
gchar *str2;
str = g_strdup_printf (_("%s%sClick: extend selection"),
gimp_get_mod_string (GDK_SHIFT_MASK),
gimp_get_mod_separator ());
str2 = g_strdup_printf (_("%s%sDrag: move & compress"),
gimp_get_mod_string (GDK_SHIFT_MASK),
gimp_get_mod_separator ());
gradient_editor_set_hint (editor,
_("Click: select Drag: move"),
str,
str2,
NULL);
g_free (str);
g_free (str2);
}
}
static void
control_button_press (GimpGradientEditor *editor,
gint x,
gint y,
guint button,
guint state)
{
GimpGradient *gradient;
GimpGradientSegment *seg;
GradientEditorDragMode handle;
gdouble xpos;
gboolean in_handle;
gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
if (button == 3)
{
gimp_editor_popup_menu (GIMP_EDITOR (editor), NULL, NULL);
return;
}
/* Find the closest handle */
xpos = control_calc_g_pos (editor, x);
seg_get_closest_handle (gradient, xpos, &seg, &handle);
in_handle = control_point_in_handle (editor, gradient, x, y, seg, handle);
/* Now see what we have */
if (in_handle)
{
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg != NULL)
{
/* Left handle of some segment */
if (state & GDK_SHIFT_MASK)
{
if (seg->prev != NULL)
{
editor->control_drag_mode = GRAD_DRAG_LEFT;
editor->control_drag_segment = seg;
editor->control_compress = TRUE;
}
else
{
control_extend_selection (editor, seg, xpos);
gimp_gradient_editor_update (editor);
}
}
else if (seg->prev != NULL)
{
editor->control_drag_mode = GRAD_DRAG_LEFT;
editor->control_drag_segment = seg;
}
else
{
control_select_single_segment (editor, seg);
gimp_gradient_editor_update (editor);
}
}
else /* seg == NULL */
{
/* Right handle of last segment */
seg = gimp_gradient_segment_get_last (gradient->segments);
if (state & GDK_SHIFT_MASK)
{
control_extend_selection (editor, seg, xpos);
gimp_gradient_editor_update (editor);
}
else
{
control_select_single_segment (editor, seg);
gimp_gradient_editor_update (editor);
}
}
break;
case GRAD_DRAG_MIDDLE:
if (state & GDK_SHIFT_MASK)
{
control_extend_selection (editor, seg, xpos);
gimp_gradient_editor_update (editor);
}
else
{
editor->control_drag_mode = GRAD_DRAG_MIDDLE;
editor->control_drag_segment = seg;
}
break;
default:
g_warning ("%s: in_handle is true, but received handle type %d.",
G_STRFUNC, in_handle);
}
}
else /* !in_handle */
{
seg = gimp_gradient_get_segment_at (gradient, xpos);
editor->control_drag_mode = GRAD_DRAG_ALL;
editor->control_drag_segment = seg;
editor->control_last_gx = xpos;
editor->control_orig_pos = xpos;
if (state & GDK_SHIFT_MASK)
editor->control_compress = TRUE;
}
}
static gboolean
control_point_in_handle (GimpGradientEditor *editor,
GimpGradient *gradient,
gint x,
gint y,
GimpGradientSegment *seg,
GradientEditorDragMode handle)
{
gint handle_pos;
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg)
{
handle_pos = control_calc_p_pos (editor, seg->left);
}
else
{
seg = gimp_gradient_segment_get_last (gradient->segments);
handle_pos = control_calc_p_pos (editor, seg->right);
}
break;
case GRAD_DRAG_MIDDLE:
handle_pos = control_calc_p_pos (editor, seg->middle);
break;
default:
g_warning ("%s: Cannot handle drag mode %d.", G_STRFUNC, handle);
return FALSE;
}
y /= 2;
if ((x >= (handle_pos - y)) && (x <= (handle_pos + y)))
return TRUE;
else
return FALSE;
}
/*****/
static void
control_select_single_segment (GimpGradientEditor *editor,
GimpGradientSegment *seg)
{
editor->control_sel_l = seg;
editor->control_sel_r = seg;
}
static void
control_extend_selection (GimpGradientEditor *editor,
GimpGradientSegment *seg,
gdouble pos)
{
if (fabs (pos - editor->control_sel_l->left) <
fabs (pos - editor->control_sel_r->right))
editor->control_sel_l = seg;
else
editor->control_sel_r = seg;
}
/*****/
static void
control_motion (GimpGradientEditor *editor,
GimpGradient *gradient,
gint x)
{
GimpGradientSegment *seg = editor->control_drag_segment;
gdouble pos;
gdouble delta;
gchar *str = NULL;
switch (editor->control_drag_mode)
{
case GRAD_DRAG_LEFT:
pos = control_calc_g_pos (editor, x);
if (! editor->control_compress)
gimp_gradient_segment_set_left_pos (gradient, seg, pos);
else
control_compress_left (gradient,
editor->control_sel_l,
editor->control_sel_r,
seg, pos);
str = g_strdup_printf (_("Handle position: %0.4f"), seg->left);
break;
case GRAD_DRAG_MIDDLE:
pos = control_calc_g_pos (editor, x);
gimp_gradient_segment_set_middle_pos (gradient, seg, pos);
str = g_strdup_printf (_("Handle position: %0.4f"), seg->middle);
break;
case GRAD_DRAG_ALL:
pos = control_calc_g_pos (editor, x);
delta = pos - editor->control_last_gx;
if ((seg->left >= editor->control_sel_l->left) &&
(seg->right <= editor->control_sel_r->right))
delta = control_move (editor,
editor->control_sel_l,
editor->control_sel_r, delta);
else
delta = control_move (editor, seg, seg, delta);
editor->control_last_gx += delta;
str = g_strdup_printf (_("Distance: %0.4f"),
editor->control_last_gx -
editor->control_orig_pos);
break;
default:
g_warning ("%s: Attempting to move bogus handle %d.",
G_STRFUNC, editor->control_drag_mode);
break;
}
gradient_editor_set_hint (editor, str, NULL, NULL, NULL);
g_free (str);
gimp_gradient_editor_update (editor);
}
static void
control_compress_left (GimpGradient *gradient,
GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
GimpGradientSegment *drag_seg,
gdouble pos)
{
GimpGradientSegment *seg;
gdouble lbound, rbound;
gint k;
/* Check what we have to compress */
if (!((drag_seg->left >= range_l->left) &&
((drag_seg->right <= range_r->right) || (drag_seg == range_r->next))))
{
/* We are compressing a segment outside the selection */
range_l = range_r = drag_seg;
}
/* Calculate left bound for dragged hadle */
if (drag_seg == range_l)
lbound = range_l->prev->left + 2.0 * EPSILON;
else
{
/* Count number of segments to the left of the dragged handle */
seg = drag_seg;
k = 0;
while (seg != range_l)
{
k++;
seg = seg->prev;
}
/* 2*k handles have to fit */
lbound = range_l->left + 2.0 * k * EPSILON;
}
/* Calculate right bound for dragged handle */
if (drag_seg == range_r->next)
rbound = range_r->next->right - 2.0 * EPSILON;
else
{
/* Count number of segments to the right of the dragged handle */
seg = drag_seg;
k = 1;
while (seg != range_r)
{
k++;
seg = seg->next;
}
/* 2*k handles have to fit */
rbound = range_r->right - 2.0 * k * EPSILON;
}
/* Calculate position */
pos = CLAMP (pos, lbound, rbound);
/* Compress segments to the left of the handle */
if (drag_seg == range_l)
gimp_gradient_segment_range_compress (gradient,
range_l->prev, range_l->prev,
range_l->prev->left, pos);
else
gimp_gradient_segment_range_compress (gradient,
range_l, drag_seg->prev,
range_l->left, pos);
/* Compress segments to the right of the handle */
if (drag_seg != range_r->next)
gimp_gradient_segment_range_compress (gradient,
drag_seg, range_r,
pos, range_r->right);
else
gimp_gradient_segment_range_compress (gradient,
drag_seg, drag_seg,
pos, drag_seg->right);
}
/*****/
static gdouble
control_move (GimpGradientEditor *editor,
GimpGradientSegment *range_l,
GimpGradientSegment *range_r,
gdouble delta)
{
GimpGradient *gradient = GIMP_GRADIENT (GIMP_DATA_EDITOR (editor)->data);
return gimp_gradient_segment_range_move (gradient,
range_l,
range_r,
delta,
editor->control_compress);
}
/*****/
static void
control_update (GimpGradientEditor *editor,
GimpGradient *gradient,
gboolean reset_selection)
{
if (! editor->control_sel_l || ! editor->control_sel_r)
reset_selection = TRUE;
if (reset_selection)
{
if (gradient)
control_select_single_segment (editor, gradient->segments);
else
control_select_single_segment (editor, NULL);
}
gtk_widget_queue_draw (editor->control);
}
static void
control_draw (GimpGradientEditor *editor,
GimpGradient *gradient,
cairo_t *cr,
gint width,
gint height,
gdouble left,
gdouble right)
{
GtkStyle *control_style;
GimpGradientSegment *seg;
GradientEditorDragMode handle;
gint sel_l;
gint sel_r;
gdouble g_pos;
gboolean selected;
if (! gradient)
return;
/* Draw selection */
control_style = gtk_widget_get_style (editor->control);
sel_l = control_calc_p_pos (editor, editor->control_sel_l->left);
sel_r = control_calc_p_pos (editor, editor->control_sel_r->right);
gdk_cairo_set_source_color (cr,
&control_style->base[GTK_STATE_NORMAL]);
cairo_rectangle (cr, 0, 0, width, height);
cairo_fill (cr);
gdk_cairo_set_source_color (cr,
&control_style->base[GTK_STATE_SELECTED]);
cairo_rectangle (cr, sel_l, 0, sel_r - sel_l + 1, height);
cairo_fill (cr);
/* Draw handles */
selected = FALSE;
for (seg = gradient->segments; seg; seg = seg->next)
{
if (seg == editor->control_sel_l)
selected = TRUE;
control_draw_normal_handle (editor, cr, seg->left, height, selected);
control_draw_middle_handle (editor, cr, seg->middle, height, selected);
/* Draw right handle only if this is the last segment */
if (seg->next == NULL)
control_draw_normal_handle (editor, cr, seg->right, height, selected);
if (seg == editor->control_sel_r)
selected = FALSE;
}
/* Draw the handle which is closest to the mouse position */
g_pos = control_calc_g_pos (editor, editor->control_last_x);
seg_get_closest_handle (gradient, CLAMP (g_pos, 0.0, 1.0), &seg, &handle);
selected = (seg &&
seg_in_selection (gradient, seg,
editor->control_sel_l, editor->control_sel_r));
switch (handle)
{
case GRAD_DRAG_LEFT:
if (seg)
{
control_draw_normal_handle (editor, cr, seg->left, height, selected);
}
else
{
seg = gimp_gradient_segment_get_last (gradient->segments);
selected = (seg == editor->control_sel_r);
control_draw_normal_handle (editor, cr, seg->right, height, selected);
}
break;
case GRAD_DRAG_MIDDLE:
control_draw_middle_handle (editor, cr, seg->middle, height, selected);
break;
default:
break;
}
}
static void
control_draw_normal_handle (GimpGradientEditor *editor,
cairo_t *cr,
gdouble pos,
gint height,
gboolean selected)
{
GtkStyle *style = gtk_widget_get_style (editor->control);
GtkStateType state = selected ? GTK_STATE_SELECTED : GTK_STATE_NORMAL;
control_draw_handle (cr,
&style->text_aa[state],
&style->black,
control_calc_p_pos (editor, pos), height);
}
static void
control_draw_middle_handle (GimpGradientEditor *editor,
cairo_t *cr,
gdouble pos,
gint height,
gboolean selected)
{
GtkStyle *style = gtk_widget_get_style (editor->control);
GtkStateType state = selected ? GTK_STATE_SELECTED : GTK_STATE_NORMAL;
control_draw_handle (cr,
&style->text_aa[state],
&style->white,
control_calc_p_pos (editor, pos), height);
}
static void
control_draw_handle (cairo_t *cr,
GdkColor *border,
GdkColor *fill,
gint xpos,
gint height)
{
cairo_move_to (cr, xpos, 0);
cairo_line_to (cr, xpos - height / 2.0, height);
cairo_line_to (cr, xpos + height / 2.0, height);
cairo_line_to (cr, xpos, 0);
gdk_cairo_set_source_color (cr, fill);
cairo_fill_preserve (cr);
gdk_cairo_set_source_color (cr, border);
cairo_set_line_width (cr, 1);
cairo_stroke (cr);
}
/*****/
static gint
control_calc_p_pos (GimpGradientEditor *editor,
gdouble pos)
{
GtkAdjustment *adjustment = GTK_ADJUSTMENT (editor->scroll_data);
GtkAllocation allocation;
gint pwidth;
gtk_widget_get_allocation (editor->control, &allocation);
pwidth = allocation.width;
/* Calculate the position (in widget's coordinates) of the
* requested point from the gradient. Rounding is done to
* minimize mismatches between the rendered gradient view
* and the gradient control's handles.
*/
return RINT ((pwidth - 1) * (pos - gtk_adjustment_get_value (adjustment)) /
gtk_adjustment_get_page_size (adjustment));
}
static gdouble
control_calc_g_pos (GimpGradientEditor *editor,
gint pos)
{
GtkAdjustment *adjustment = GTK_ADJUSTMENT (editor->scroll_data);
GtkAllocation allocation;
gint pwidth;
gtk_widget_get_allocation (editor->control, &allocation);
pwidth = allocation.width;
/* Calculate the gradient position that corresponds to widget's coordinates */
return (gtk_adjustment_get_page_size (adjustment) * pos / (pwidth - 1) +
gtk_adjustment_get_value (adjustment));
}
/***** Segment functions *****/
static void
seg_get_closest_handle (GimpGradient *grad,
gdouble pos,
GimpGradientSegment **seg,
GradientEditorDragMode *handle)
{
gdouble l_delta, m_delta, r_delta;
*seg = gimp_gradient_get_segment_at (grad, pos);
m_delta = fabs (pos - (*seg)->middle);
if (pos < (*seg)->middle)
{
l_delta = fabs (pos - (*seg)->left);
if (l_delta < m_delta)
*handle = GRAD_DRAG_LEFT;
else
*handle = GRAD_DRAG_MIDDLE;
}
else
{
r_delta = fabs (pos - (*seg)->right);
if (m_delta < r_delta)
{
*handle = GRAD_DRAG_MIDDLE;
}
else
{
*seg = (*seg)->next;
*handle = GRAD_DRAG_LEFT;
}
}
}
static gboolean
seg_in_selection (GimpGradient *grad,
GimpGradientSegment *seg,
GimpGradientSegment *left,
GimpGradientSegment *right)
{
GimpGradientSegment *s;
for (s = left; s; s = s->next)
{
if (s == seg)
return TRUE;
if (s == right)
break;
}
return FALSE;
}
static GtkWidget *
gradient_hint_label_add (GtkBox *box)
{
GtkWidget *label = g_object_new (GTK_TYPE_LABEL,
"xalign", 0.0,
"yalign", 0.5,
"single-line-mode", TRUE,
NULL);
gtk_box_pack_start (box, label, FALSE, FALSE, 0);
gtk_widget_show (label);
return label;
}
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