void
gimp_display_shell_rotate (GimpDisplayShell *shell,
gdouble delta)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_rotate_to (shell, shell->rotate_angle + delta);
}
void
gimp_display_shell_rotate_drag (GimpDisplayShell *shell,
gdouble last_x,
gdouble last_y,
gdouble cur_x,
gdouble cur_y,
gboolean constrain)
{
gint image_width, image_height;
gdouble px, py;
gdouble x1, y1, x2, y2;
gdouble angle1, angle2, angle;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_scale_get_image_size (shell,
&image_width, &image_height);
px = -shell->offset_x + image_width / 2;
py = -shell->offset_y + image_height / 2;
x1 = cur_x - px;
x2 = last_x - px;
y1 = py - cur_y;
y2 = py - last_y;
/* find the first angle */
angle1 = atan2 (y1, x1);
/* find the angle */
angle2 = atan2 (y2, x2);
angle = angle2 - angle1;
if (angle > G_PI || angle < -G_PI)
angle = angle2 - ((angle1 < 0) ? 2.0 * G_PI + angle1 : angle1 - 2.0 * G_PI);
shell->rotate_drag_angle += (angle * 180.0 / G_PI);
if (shell->rotate_drag_angle < 0.0)
shell->rotate_drag_angle += 360;
if (shell->rotate_drag_angle >= 360.0)
shell->rotate_drag_angle -= 360;
gimp_display_shell_rotate_to (shell,
constrain ?
(gint) shell->rotate_drag_angle / 15 * 15 :
shell->rotate_drag_angle);
}
static void
rotate_adjustment_changed (GtkAdjustment *adj,
RotateDialogData *dialog)
{
gdouble angle = gtk_adjustment_get_value (dialog->rotate_adj);
g_signal_handlers_block_by_func (dialog->shell,
display_shell_rotated,
dialog);
gimp_display_shell_rotate_to (dialog->shell, angle);
g_signal_handlers_unblock_by_func (dialog->shell,
display_shell_rotated,
dialog);
}
void
view_rotate_absolute_cmd_callback (GtkAction *action,
gint value,
gpointer data)
{
GimpDisplay *display;
GimpDisplayShell *shell;
gdouble angle = 0.0;
return_if_no_display (display, data);
shell = gimp_display_get_shell (display);
angle = action_select_value ((GimpActionSelectType) value,
0.0,
-180.0, 180.0, 0.0,
1.0, 15.0, 90.0, 0.0,
TRUE);
gimp_display_shell_rotate_to (shell, angle);
}
