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godot/scene/2d/node_2d.cpp
Hein-Pieter van Braam cacced7e50 Convert Object::cast_to() to the static version 
Currently we rely on some undefined behavior when Object->cast_to() gets
called with a Null pointer. This used to work fine with GCC < 6 but
newer versions of GCC remove all codepaths in which the this pointer is
Null. However, the non-static cast_to() was supposed to be null safe.

This patch makes cast_to() Null safe and removes the now redundant Null
checks where they existed.

It is explained in this article: https://www.viva64.com/en/b/0226/
2017-08-24 23:08:24 +02:00

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/*************************************************************************/
/* node_2d.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "node_2d.h"
#include "message_queue.h"
#include "scene/gui/control.h"
#include "scene/main/viewport.h"
#include "servers/visual_server.h"
void Node2D::edit_set_pivot(const Point2 &p_pivot) {
}
Point2 Node2D::edit_get_pivot() const {
return Point2();
}
bool Node2D::edit_has_pivot() const {
return false;
}
Variant Node2D::edit_get_state() const {
Array state;
state.push_back(get_position());
state.push_back(get_rotation());
state.push_back(get_scale());
return state;
}
void Node2D::edit_set_state(const Variant &p_state) {
Array state = p_state;
ERR_FAIL_COND(state.size() != 3);
pos = state[0];
angle = state[1];
_scale = state[2];
_update_transform();
_change_notify("rotation");
_change_notify("rotation_deg");
_change_notify("scale");
_change_notify("position");
}
void Node2D::edit_set_rect(const Rect2 &p_edit_rect) {
Rect2 r = get_item_rect();
Vector2 zero_offset;
if (r.size.x != 0)
zero_offset.x = -r.position.x / r.size.x;
if (r.size.y != 0)
zero_offset.y = -r.position.y / r.size.y;
Size2 new_scale(1, 1);
if (r.size.x != 0)
new_scale.x = p_edit_rect.size.x / r.size.x;
if (r.size.y != 0)
new_scale.y = p_edit_rect.size.y / r.size.y;
Point2 new_pos = p_edit_rect.position + p_edit_rect.size * zero_offset; //p_edit_rect.pos - r.pos;
Transform2D postxf;
postxf.set_rotation_and_scale(angle, _scale);
new_pos = postxf.xform(new_pos);
pos += new_pos;
_scale *= new_scale;
_update_transform();
_change_notify("scale");
_change_notify("position");
}
void Node2D::edit_rotate(float p_rot) {
angle += p_rot;
_update_transform();
_change_notify("rotation");
_change_notify("rotation_deg");
}
void Node2D::_update_xform_values() {
pos = _mat.elements[2];
angle = _mat.get_rotation();
_scale = _mat.get_scale();
_xform_dirty = false;
}
void Node2D::_update_transform() {
Transform2D mat(angle, pos);
_mat.set_rotation_and_scale(angle, _scale);
_mat.elements[2] = pos;
VisualServer::get_singleton()->canvas_item_set_transform(get_canvas_item(), _mat);
if (!is_inside_tree())
return;
_notify_transform();
}
void Node2D::set_position(const Point2 &p_pos) {
if (_xform_dirty)
((Node2D *)this)->_update_xform_values();
pos = p_pos;
_update_transform();
_change_notify("position");
}
void Node2D::set_rotation(float p_radians) {
if (_xform_dirty)
((Node2D *)this)->_update_xform_values();
angle = p_radians;
_update_transform();
_change_notify("rotation");
_change_notify("rotation_deg");
}
void Node2D::set_rotation_in_degrees(float p_degrees) {
set_rotation(Math::deg2rad(p_degrees));
}
// Kept for compatibility after rename to set_rotd.
// Could be removed after a couple releases.
void Node2D::_set_rotd(float p_degrees) {
WARN_PRINT("Deprecated method Node2D._set_rotd(): This method was renamed to set_rotd. Please adapt your code accordingly, as the old method will be obsoleted.");
set_rotation_in_degrees(p_degrees);
}
void Node2D::set_scale(const Size2 &p_scale) {
if (_xform_dirty)
((Node2D *)this)->_update_xform_values();
_scale = p_scale;
if (_scale.x == 0)
_scale.x = CMP_EPSILON;
if (_scale.y == 0)
_scale.y = CMP_EPSILON;
_update_transform();
_change_notify("scale");
}
Point2 Node2D::get_position() const {
if (_xform_dirty)
((Node2D *)this)->_update_xform_values();
return pos;
}
float Node2D::get_rotation() const {
if (_xform_dirty)
((Node2D *)this)->_update_xform_values();
return angle;
}
float Node2D::get_rotation_in_degrees() const {
return Math::rad2deg(get_rotation());
}
// Kept for compatibility after rename to get_rotd.
// Could be removed after a couple releases.
float Node2D::_get_rotd() const {
WARN_PRINT("Deprecated method Node2D._get_rotd(): This method was renamed to get_rotd. Please adapt your code accordingly, as the old method will be obsoleted.");
return get_rotation_in_degrees();
}
Size2 Node2D::get_scale() const {
if (_xform_dirty)
((Node2D *)this)->_update_xform_values();
return _scale;
}
void Node2D::_notification(int p_what) {
switch (p_what) {
}
}
Transform2D Node2D::get_transform() const {
return _mat;
}
Rect2 Node2D::get_item_rect() const {
if (get_script_instance()) {
Variant::CallError err;
Rect2 r = get_script_instance()->call("_get_item_rect", NULL, 0, err);
if (err.error == Variant::CallError::CALL_OK)
return r;
}
return Rect2(Point2(-32, -32), Size2(64, 64));
}
void Node2D::rotate(float p_radians) {
set_rotation(get_rotation() + p_radians);
}
void Node2D::translate(const Vector2 &p_amount) {
set_position(get_position() + p_amount);
}
void Node2D::global_translate(const Vector2 &p_amount) {
set_global_position(get_global_position() + p_amount);
}
void Node2D::apply_scale(const Size2 &p_amount) {
set_scale(get_scale() * p_amount);
}
void Node2D::move_x(float p_delta, bool p_scaled) {
Transform2D t = get_transform();
Vector2 m = t[0];
if (!p_scaled)
m.normalize();
set_position(t[2] + m * p_delta);
}
void Node2D::move_y(float p_delta, bool p_scaled) {
Transform2D t = get_transform();
Vector2 m = t[1];
if (!p_scaled)
m.normalize();
set_position(t[2] + m * p_delta);
}
Point2 Node2D::get_global_position() const {
return get_global_transform().get_origin();
}
void Node2D::set_global_position(const Point2 &p_pos) {
Transform2D inv;
CanvasItem *pi = get_parent_item();
if (pi) {
inv = pi->get_global_transform().affine_inverse();
set_position(inv.xform(p_pos));
} else {
set_position(p_pos);
}
}
float Node2D::get_global_rotation() const {
return get_global_transform().get_rotation();
}
void Node2D::set_global_rotation(float p_radians) {
CanvasItem *pi = get_parent_item();
if (pi) {
const float parent_global_rot = pi->get_global_transform().get_rotation();
set_rotation(p_radians - parent_global_rot);
} else {
set_rotation(p_radians);
}
}
float Node2D::get_global_rotation_in_degrees() const {
return Math::rad2deg(get_global_rotation());
}
void Node2D::set_global_rotation_in_degrees(float p_degrees) {
set_global_rotation(Math::deg2rad(p_degrees));
}
Size2 Node2D::get_global_scale() const {
return get_global_transform().get_scale();
}
void Node2D::set_global_scale(const Size2 &p_scale) {
CanvasItem *pi = get_parent_item();
if (pi) {
const Size2 parent_global_scale = pi->get_global_transform().get_scale();
set_scale(p_scale / parent_global_scale);
} else {
set_scale(p_scale);
}
}
void Node2D::set_transform(const Transform2D &p_transform) {
_mat = p_transform;
_xform_dirty = true;
VisualServer::get_singleton()->canvas_item_set_transform(get_canvas_item(), _mat);
if (!is_inside_tree())
return;
_notify_transform();
}
void Node2D::set_global_transform(const Transform2D &p_transform) {
CanvasItem *pi = get_parent_item();
if (pi)
set_transform(pi->get_global_transform().affine_inverse() * p_transform);
else
set_transform(p_transform);
}
void Node2D::set_z(int p_z) {
ERR_FAIL_COND(p_z < VS::CANVAS_ITEM_Z_MIN);
ERR_FAIL_COND(p_z > VS::CANVAS_ITEM_Z_MAX);
z = p_z;
VS::get_singleton()->canvas_item_set_z(get_canvas_item(), z);
_change_notify("z");
}
void Node2D::set_z_as_relative(bool p_enabled) {
if (z_relative == p_enabled)
return;
z_relative = p_enabled;
VS::get_singleton()->canvas_item_set_z_as_relative_to_parent(get_canvas_item(), p_enabled);
}
bool Node2D::is_z_relative() const {
return z_relative;
}
int Node2D::get_z() const {
return z;
}
Transform2D Node2D::get_relative_transform_to_parent(const Node *p_parent) const {
if (p_parent == this)
return Transform2D();
Node2D *parent_2d = Object::cast_to<Node2D>(get_parent());
ERR_FAIL_COND_V(!parent_2d, Transform2D());
if (p_parent == parent_2d)
return get_transform();
else
return parent_2d->get_relative_transform_to_parent(p_parent) * get_transform();
}
void Node2D::look_at(const Vector2 &p_pos) {
rotate(get_angle_to(p_pos));
}
float Node2D::get_angle_to(const Vector2 &p_pos) const {
return (get_global_transform().affine_inverse().xform(p_pos)).angle();
}
Point2 Node2D::to_local(Point2 p_global) const {
return get_global_transform().affine_inverse().xform(p_global);
}
Point2 Node2D::to_global(Point2 p_local) const {
return get_global_transform().xform(p_local);
}
void Node2D::_bind_methods() {
// TODO: Obsolete those two methods (old name) properly (GH-4397)
ClassDB::bind_method(D_METHOD("_get_rotd"), &Node2D::_get_rotd);
ClassDB::bind_method(D_METHOD("_set_rotd", "degrees"), &Node2D::_set_rotd);
ClassDB::bind_method(D_METHOD("set_position", "pos"), &Node2D::set_position);
ClassDB::bind_method(D_METHOD("set_rotation", "radians"), &Node2D::set_rotation);
ClassDB::bind_method(D_METHOD("set_rotation_in_degrees", "degrees"), &Node2D::set_rotation_in_degrees);
ClassDB::bind_method(D_METHOD("set_scale", "scale"), &Node2D::set_scale);
ClassDB::bind_method(D_METHOD("get_position"), &Node2D::get_position);
ClassDB::bind_method(D_METHOD("get_rotation"), &Node2D::get_rotation);
ClassDB::bind_method(D_METHOD("get_rotation_in_degrees"), &Node2D::get_rotation_in_degrees);
ClassDB::bind_method(D_METHOD("get_scale"), &Node2D::get_scale);
ClassDB::bind_method(D_METHOD("rotate", "radians"), &Node2D::rotate);
ClassDB::bind_method(D_METHOD("move_local_x", "delta", "scaled"), &Node2D::move_x, DEFVAL(false));
ClassDB::bind_method(D_METHOD("move_local_y", "delta", "scaled"), &Node2D::move_y, DEFVAL(false));
ClassDB::bind_method(D_METHOD("translate", "offset"), &Node2D::translate);
ClassDB::bind_method(D_METHOD("global_translate", "offset"), &Node2D::global_translate);
ClassDB::bind_method(D_METHOD("apply_scale", "ratio"), &Node2D::apply_scale);
ClassDB::bind_method(D_METHOD("set_global_position", "pos"), &Node2D::set_global_position);
ClassDB::bind_method(D_METHOD("get_global_position"), &Node2D::get_global_position);
ClassDB::bind_method(D_METHOD("set_global_rotation", "radians"), &Node2D::set_global_rotation);
ClassDB::bind_method(D_METHOD("get_global_rotation"), &Node2D::get_global_rotation);
ClassDB::bind_method(D_METHOD("set_global_rotation_in_degrees", "degrees"), &Node2D::set_global_rotation_in_degrees);
ClassDB::bind_method(D_METHOD("get_global_rotation_in_degrees"), &Node2D::get_global_rotation_in_degrees);
ClassDB::bind_method(D_METHOD("set_global_scale", "scale"), &Node2D::set_global_scale);
ClassDB::bind_method(D_METHOD("get_global_scale"), &Node2D::get_global_scale);
ClassDB::bind_method(D_METHOD("set_transform", "xform"), &Node2D::set_transform);
ClassDB::bind_method(D_METHOD("set_global_transform", "xform"), &Node2D::set_global_transform);
ClassDB::bind_method(D_METHOD("look_at", "point"), &Node2D::look_at);
ClassDB::bind_method(D_METHOD("get_angle_to", "point"), &Node2D::get_angle_to);
ClassDB::bind_method(D_METHOD("to_local", "global_point"), &Node2D::to_local);
ClassDB::bind_method(D_METHOD("to_global", "local_point"), &Node2D::to_global);
ClassDB::bind_method(D_METHOD("set_z", "z"), &Node2D::set_z);
ClassDB::bind_method(D_METHOD("get_z"), &Node2D::get_z);
ClassDB::bind_method(D_METHOD("set_z_as_relative", "enable"), &Node2D::set_z_as_relative);
ClassDB::bind_method(D_METHOD("is_z_relative"), &Node2D::is_z_relative);
ClassDB::bind_method(D_METHOD("edit_set_pivot", "pivot"), &Node2D::edit_set_pivot);
ClassDB::bind_method(D_METHOD("get_relative_transform_to_parent", "parent"), &Node2D::get_relative_transform_to_parent);
ADD_GROUP("Transform", "");
ADD_PROPERTYNZ(PropertyInfo(Variant::VECTOR2, "position"), "set_position", "get_position");
ADD_PROPERTYNZ(PropertyInfo(Variant::REAL, "rotation", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "set_rotation", "get_rotation");
ADD_PROPERTYNZ(PropertyInfo(Variant::REAL, "rotation_deg", PROPERTY_HINT_RANGE, "-1440,1440,0.1", PROPERTY_USAGE_EDITOR), "set_rotation_in_degrees", "get_rotation_in_degrees");
ADD_PROPERTYNO(PropertyInfo(Variant::VECTOR2, "scale"), "set_scale", "get_scale");
ADD_PROPERTY(PropertyInfo(Variant::TRANSFORM2D, "transform", PROPERTY_HINT_NONE, "", 0), "set_transform", "get_transform");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "global_position", PROPERTY_HINT_NONE, "", 0), "set_global_position", "get_global_position");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "global_rotation", PROPERTY_HINT_NONE, "", 0), "set_global_rotation", "get_global_rotation");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "global_rotation_deg", PROPERTY_HINT_NONE, "", 0), "set_global_rotation_in_degrees", "get_global_rotation_in_degrees");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "global_scale", PROPERTY_HINT_NONE, "", 0), "set_global_scale", "get_global_scale");
ADD_PROPERTY(PropertyInfo(Variant::TRANSFORM2D, "global_transform", PROPERTY_HINT_NONE, "", 0), "set_global_transform", "get_global_transform");
ADD_GROUP("Z", "");
ADD_PROPERTYNZ(PropertyInfo(Variant::INT, "z", PROPERTY_HINT_RANGE, itos(VS::CANVAS_ITEM_Z_MIN) + "," + itos(VS::CANVAS_ITEM_Z_MAX) + ",1"), "set_z", "get_z");
ADD_PROPERTYNO(PropertyInfo(Variant::BOOL, "z_as_relative"), "set_z_as_relative", "is_z_relative");
}
Node2D::Node2D() {
angle = 0;
_scale = Vector2(1, 1);
_xform_dirty = false;
z = 0;
z_relative = true;
}
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