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app: update GimpToolCompass when display is scaled/rotated

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In GimpToolCompass (and, as a consequence, in the measure tool),
update the measured angle when the shell is scaled, rotated, or
flipped, so that we always satisfy the compass's constrains, and
render correctly.

(cherry picked from commit a810c6b60b)
This commit is contained in:
Ell
2018-07-16 04:42:14 -04:00
parent 7ab213d918
commit e13eb13bc4
1 changed files with 34 additions and 6 deletions
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40
app/display/gimptoolcompass.c
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@ -292,12 +292,20 @@ gimp_tool_compass_constructed (GObject *object)
{
GimpToolCompass *compass = GIMP_TOOL_COMPASS (object);
GimpToolWidget *widget = GIMP_TOOL_WIDGET (object);
GimpDisplayShell *shell = gimp_tool_widget_get_shell (widget);
GimpToolCompassPrivate *private = compass->private;
GimpCanvasGroup *stroke_group;
gint i;
G_OBJECT_CLASS (parent_class)->constructed (object);
g_signal_connect_object (shell, "scaled",
G_CALLBACK (gimp_tool_compass_changed),
compass, G_CONNECT_SWAPPED);
g_signal_connect_object (shell, "rotated",
G_CALLBACK (gimp_tool_compass_changed),
compass, G_CONNECT_SWAPPED);
stroke_group = gimp_tool_widget_add_stroke_group (widget);
gimp_tool_widget_push_group (widget, stroke_group);
@ -1069,6 +1077,8 @@ gimp_tool_compass_update_angle (GimpToolCompass *compass,
GimpImage *image = gimp_display_get_image (shell->display);
GimpVector2 radius1;
GimpVector2 radius2;
gdouble pixel_angle;
gdouble unit_angle;
gdouble xres;
gdouble yres;
@ -1112,8 +1122,8 @@ gimp_tool_compass_update_angle (GimpToolCompass *compass,
radius1 = private->radius1;
radius2 = private->radius2;
private->pixel_angle = atan2 (gimp_vector2_cross_product (&radius1, &radius2).x,
gimp_vector2_inner_product (&radius1, &radius2));
pixel_angle = atan2 (gimp_vector2_cross_product (&radius1, &radius2).x,
gimp_vector2_inner_product (&radius1, &radius2));
radius1.x /= xres;
radius1.y /= yres;
@ -1121,19 +1131,21 @@ gimp_tool_compass_update_angle (GimpToolCompass *compass,
radius2.x /= xres;
radius2.y /= yres;
private->unit_angle = atan2 (gimp_vector2_cross_product (&radius1, &radius2).x,
gimp_vector2_inner_product (&radius1, &radius2));
unit_angle = atan2 (gimp_vector2_cross_product (&radius1, &radius2).x,
gimp_vector2_inner_product (&radius1, &radius2));
if (shell->dot_for_dot)
private->display_angle = private->pixel_angle;
private->display_angle = pixel_angle;
else
private->display_angle = private->unit_angle;
private->display_angle = unit_angle;
if (private->n_points == 2)
{
if (! flip && fabs (private->display_angle) > G_PI / 2.0 + EPSILON)
{
gimp_tool_compass_update_angle (compass, orientation, TRUE);
return;
}
else if (orientation == GIMP_COMPASS_ORIENTATION_AUTO &&
fabs (private->display_angle) > G_PI / 4.0 + EPSILON)
@ -1141,8 +1153,24 @@ gimp_tool_compass_update_angle (GimpToolCompass *compass,
gimp_tool_compass_update_angle (compass,
GIMP_COMPASS_ORIENTATION_VERTICAL,
FALSE);
return;
}
}
if (pixel_angle != private->pixel_angle)
{
private->pixel_angle = pixel_angle;
g_object_notify (G_OBJECT (compass), "pixel-angle");
}
if (unit_angle != private->unit_angle)
{
private->unit_angle = unit_angle;
g_object_notify (G_OBJECT (compass), "unit-angle");
}
}