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app: in GimpCurveView, snap to curve when holding Ctrl 

In GimpCurveView, when holding down Ctrl while adding/dragging a
point, snap the y-coordinate to the original curve (at the start of
the drag).  This is particularly useful for adding points along the
curve, without changing their y-coordinate.

Likewise, have the coordinate indicator show the snapped
coordinate.
This commit is contained in:
Ell 2019-04-17 17:48:49 -04:00
parent 0b9737a3ed
commit 8357c9ad64
2 changed files with 16 additions and 0 deletions
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15
app/widgets/gimpcurveview.c
View File

@ -243,6 +243,8 @@ gimp_curve_view_finalize (GObject *object)
{
GimpCurveView *view = GIMP_CURVE_VIEW (object);
g_clear_object (&view->orig_curve);
g_clear_object (&view->layout);
g_clear_object (&view->cursor_layout);
@ -811,6 +813,8 @@ gimp_curve_view_button_press (GtkWidget *widget,
view->grabbed = TRUE;
view->orig_curve = GIMP_CURVE (gimp_data_duplicate (GIMP_DATA (curve)));
set_cursor (view, GDK_TCROSS);
switch (gimp_curve_get_curve_type (curve))
@ -852,6 +856,9 @@ gimp_curve_view_button_press (GtkWidget *widget,
}
else
{
if (bevent->state & gimp_get_constrain_behavior_mask ())
y = 1.0 - gimp_curve_map_value (view->orig_curve, x);
gimp_curve_set_point (curve, view->selected, x, 1.0 - y);
}
break;
@ -879,6 +886,8 @@ gimp_curve_view_button_release (GtkWidget *widget,
if (bevent->button != 1)
return TRUE;
g_clear_object (&view->orig_curve);
view->offset_x = 0.0;
view->offset_y = 0.0;
@ -942,12 +951,18 @@ gimp_curve_view_motion_notify (GtkWidget *widget,
else
{
new_cursor = GDK_TCROSS;
if (mevent->state & gimp_get_constrain_behavior_mask ())
y = 1.0 - gimp_curve_map_value (view->curve, x);
}
}
else /* Else, drag the grabbed point */
{
new_cursor = GDK_TCROSS;
if (mevent->state & gimp_get_constrain_behavior_mask ())
y = 1.0 - gimp_curve_map_value (view->orig_curve, x);
gimp_data_freeze (GIMP_DATA (curve));
gimp_curve_set_point (curve, view->selected, -1.0, -1.0);

1
app/widgets/gimpcurveview.h
View File

@ -55,6 +55,7 @@ struct _GimpCurveView
gdouble leftmost;
gdouble rightmost;
gboolean grabbed;
GimpCurve *orig_curve;
GdkCursorType cursor_type;