godot/scene/3d/path.cpp
2019-04-25 13:20:29 -04:00

405 lines
12 KiB
C++

/*************************************************************************/
/* path.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2019 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 "path.h"
#include "core/engine.h"
#include "scene/scene_string_names.h"
void Path::_notification(int p_what) {
}
void Path::_curve_changed() {
if (is_inside_tree() && Engine::get_singleton()->is_editor_hint())
update_gizmo();
if (is_inside_tree()) {
emit_signal("curve_changed");
}
// update the configuration warnings of all children of type PathFollow
// previously used for PathFollowOriented (now enforced orientation is done in PathFollow)
if (is_inside_tree()) {
for (int i = 0; i < get_child_count(); i++) {
PathFollow *child = Object::cast_to<PathFollow>(get_child(i));
if (child) {
child->update_configuration_warning();
}
}
}
}
void Path::set_curve(const Ref<Curve3D> &p_curve) {
if (curve.is_valid()) {
curve->disconnect("changed", this, "_curve_changed");
}
curve = p_curve;
if (curve.is_valid()) {
curve->connect("changed", this, "_curve_changed");
}
_curve_changed();
}
Ref<Curve3D> Path::get_curve() const {
return curve;
}
void Path::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_curve", "curve"), &Path::set_curve);
ClassDB::bind_method(D_METHOD("get_curve"), &Path::get_curve);
ClassDB::bind_method(D_METHOD("_curve_changed"), &Path::_curve_changed);
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve3D"), "set_curve", "get_curve");
ADD_SIGNAL(MethodInfo("curve_changed"));
}
Path::Path() {
set_curve(Ref<Curve3D>(memnew(Curve3D))); //create one by default
}
//////////////
void PathFollow::_update_transform() {
if (!path)
return;
Ref<Curve3D> c = path->get_curve();
if (!c.is_valid())
return;
if (delta_offset == 0) {
return;
}
float bl = c->get_baked_length();
if (bl == 0.0) {
return;
}
float bi = c->get_bake_interval();
float o = offset;
float o_next = offset + bi;
if (loop) {
o = Math::fposmod(o, bl);
o_next = Math::fposmod(o_next, bl);
} else if (rotation_mode == ROTATION_ORIENTED && o_next >= bl) {
o = bl - bi;
o_next = bl;
}
Vector3 pos = c->interpolate_baked(o, cubic);
Transform t = get_transform();
// Vector3 pos_offset = Vector3(h_offset, v_offset, 0); not used in all cases
// will be replaced by "Vector3(h_offset, v_offset, 0)" where it was formerly used
if (rotation_mode == ROTATION_ORIENTED) {
Vector3 forward = c->interpolate_baked(o_next, cubic) - pos;
if (forward.length_squared() < CMP_EPSILON2)
forward = Vector3(0, 0, 1);
else
forward.normalize();
Vector3 up = c->interpolate_baked_up_vector(o, true);
if (o_next < o) {
Vector3 up1 = c->interpolate_baked_up_vector(o_next, true);
Vector3 axis = up.cross(up1);
if (axis.length_squared() < CMP_EPSILON2)
axis = forward;
else
axis.normalize();
up.rotate(axis, up.angle_to(up1) * 0.5f);
}
Vector3 scale = t.basis.get_scale();
Vector3 sideways = up.cross(forward).normalized();
up = forward.cross(sideways).normalized();
t.basis.set(sideways, up, forward);
t.basis.scale_local(scale);
t.origin = pos + sideways * h_offset + up * v_offset;
} else if (rotation_mode != ROTATION_NONE) {
// perform parallel transport
//
// see C. Dougan, The Parallel Transport Frame, Game Programming Gems 2 for example
// for a discussion about why not Frenet frame.
t.origin = pos;
Vector3 t_prev = (pos - c->interpolate_baked(o - delta_offset, cubic)).normalized();
Vector3 t_cur = (c->interpolate_baked(o + delta_offset, cubic) - pos).normalized();
Vector3 axis = t_prev.cross(t_cur);
float dot = t_prev.dot(t_cur);
float angle = Math::acos(CLAMP(dot, -1, 1));
if (likely(!Math::is_zero_approx(angle))) {
if (rotation_mode == ROTATION_Y) {
// assuming we're referring to global Y-axis. is this correct?
axis.x = 0;
axis.z = 0;
} else if (rotation_mode == ROTATION_XY) {
axis.z = 0;
} else if (rotation_mode == ROTATION_XYZ) {
// all components are allowed
}
if (likely(!Math::is_zero_approx(axis.length()))) {
t.rotate_basis(axis.normalized(), angle);
}
}
// do the additional tilting
float tilt_angle = c->interpolate_baked_tilt(o);
Vector3 tilt_axis = t_cur; // not sure what tilt is supposed to do, is this correct??
if (likely(!Math::is_zero_approx(Math::abs(tilt_angle)))) {
if (rotation_mode == ROTATION_Y) {
tilt_axis.x = 0;
tilt_axis.z = 0;
} else if (rotation_mode == ROTATION_XY) {
tilt_axis.z = 0;
} else if (rotation_mode == ROTATION_XYZ) {
// all components are allowed
}
if (likely(!Math::is_zero_approx(tilt_axis.length()))) {
t.rotate_basis(tilt_axis.normalized(), tilt_angle);
}
}
t.translate(Vector3(h_offset, v_offset, 0));
} else {
t.origin = pos + Vector3(h_offset, v_offset, 0);
}
set_transform(t);
}
void PathFollow::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_ENTER_TREE: {
Node *parent = get_parent();
if (parent) {
path = Object::cast_to<Path>(parent);
if (path) {
_update_transform();
}
}
} break;
case NOTIFICATION_EXIT_TREE: {
path = NULL;
} break;
}
}
void PathFollow::set_cubic_interpolation(bool p_enable) {
cubic = p_enable;
}
bool PathFollow::get_cubic_interpolation() const {
return cubic;
}
void PathFollow::_validate_property(PropertyInfo &property) const {
if (property.name == "offset") {
float max = 10000;
if (path && path->get_curve().is_valid())
max = path->get_curve()->get_baked_length();
property.hint_string = "0," + rtos(max) + ",0.01,or_greater";
}
}
String PathFollow::get_configuration_warning() const {
if (!is_visible_in_tree() || !is_inside_tree())
return String();
if (!Object::cast_to<Path>(get_parent())) {
return TTR("PathFollow only works when set as a child of a Path node.");
} else {
Path *path = Object::cast_to<Path>(get_parent());
if (path->get_curve().is_valid() && !path->get_curve()->is_up_vector_enabled() && rotation_mode == ROTATION_ORIENTED) {
return TTR("PathFollow ROTATION_ORIENTED requires \"Up Vector\" enabled in its parent Path's Curve resource.");
}
}
return String();
}
void PathFollow::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_offset", "offset"), &PathFollow::set_offset);
ClassDB::bind_method(D_METHOD("get_offset"), &PathFollow::get_offset);
ClassDB::bind_method(D_METHOD("set_h_offset", "h_offset"), &PathFollow::set_h_offset);
ClassDB::bind_method(D_METHOD("get_h_offset"), &PathFollow::get_h_offset);
ClassDB::bind_method(D_METHOD("set_v_offset", "v_offset"), &PathFollow::set_v_offset);
ClassDB::bind_method(D_METHOD("get_v_offset"), &PathFollow::get_v_offset);
ClassDB::bind_method(D_METHOD("set_unit_offset", "unit_offset"), &PathFollow::set_unit_offset);
ClassDB::bind_method(D_METHOD("get_unit_offset"), &PathFollow::get_unit_offset);
ClassDB::bind_method(D_METHOD("set_rotation_mode", "rotation_mode"), &PathFollow::set_rotation_mode);
ClassDB::bind_method(D_METHOD("get_rotation_mode"), &PathFollow::get_rotation_mode);
ClassDB::bind_method(D_METHOD("set_cubic_interpolation", "enable"), &PathFollow::set_cubic_interpolation);
ClassDB::bind_method(D_METHOD("get_cubic_interpolation"), &PathFollow::get_cubic_interpolation);
ClassDB::bind_method(D_METHOD("set_loop", "loop"), &PathFollow::set_loop);
ClassDB::bind_method(D_METHOD("has_loop"), &PathFollow::has_loop);
ADD_PROPERTY(PropertyInfo(Variant::REAL, "offset", PROPERTY_HINT_RANGE, "0,10000,0.01,or_greater"), "set_offset", "get_offset");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "unit_offset", PROPERTY_HINT_RANGE, "0,1,0.0001,or_greater", PROPERTY_USAGE_EDITOR), "set_unit_offset", "get_unit_offset");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "h_offset"), "set_h_offset", "get_h_offset");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "v_offset"), "set_v_offset", "get_v_offset");
ADD_PROPERTY(PropertyInfo(Variant::INT, "rotation_mode", PROPERTY_HINT_ENUM, "None,Y,XY,XYZ,Oriented"), "set_rotation_mode", "get_rotation_mode");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "cubic_interp"), "set_cubic_interpolation", "get_cubic_interpolation");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "loop"), "set_loop", "has_loop");
BIND_ENUM_CONSTANT(ROTATION_NONE);
BIND_ENUM_CONSTANT(ROTATION_Y);
BIND_ENUM_CONSTANT(ROTATION_XY);
BIND_ENUM_CONSTANT(ROTATION_XYZ);
BIND_ENUM_CONSTANT(ROTATION_ORIENTED);
}
void PathFollow::set_offset(float p_offset) {
delta_offset = p_offset - offset;
offset = p_offset;
if (path)
_update_transform();
_change_notify("offset");
_change_notify("unit_offset");
}
void PathFollow::set_h_offset(float p_h_offset) {
h_offset = p_h_offset;
if (path)
_update_transform();
}
float PathFollow::get_h_offset() const {
return h_offset;
}
void PathFollow::set_v_offset(float p_v_offset) {
v_offset = p_v_offset;
if (path)
_update_transform();
}
float PathFollow::get_v_offset() const {
return v_offset;
}
float PathFollow::get_offset() const {
return offset;
}
void PathFollow::set_unit_offset(float p_unit_offset) {
if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length())
set_offset(p_unit_offset * path->get_curve()->get_baked_length());
}
float PathFollow::get_unit_offset() const {
if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length())
return get_offset() / path->get_curve()->get_baked_length();
else
return 0;
}
void PathFollow::set_rotation_mode(RotationMode p_rotation_mode) {
rotation_mode = p_rotation_mode;
update_configuration_warning();
_update_transform();
}
PathFollow::RotationMode PathFollow::get_rotation_mode() const {
return rotation_mode;
}
void PathFollow::set_loop(bool p_loop) {
loop = p_loop;
}
bool PathFollow::has_loop() const {
return loop;
}
PathFollow::PathFollow() {
offset = 0;
delta_offset = 0;
h_offset = 0;
v_offset = 0;
path = NULL;
rotation_mode = ROTATION_XYZ;
cubic = true;
loop = true;
}