godot/scene/2d/path_2d.cpp
Rémi Verschelde b50a9114b1 Update copyright statements to 2018
Happy new year to the wonderful Godot community!
2018-01-01 14:40:47 +01:00

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/*************************************************************************/
/* path_2d.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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_2d.h"
#include "engine.h"
#include "scene/scene_string_names.h"
void Path2D::_notification(int p_what) {
if (p_what == NOTIFICATION_DRAW && curve.is_valid()) {
//draw the curve!!
if (!Engine::get_singleton()->is_editor_hint() && !get_tree()->is_debugging_navigation_hint()) {
return;
}
for (int i = 0; i < curve->get_point_count(); i++) {
Vector2 prev_p = curve->get_point_position(i);
for (int j = 1; j <= 8; j++) {
real_t frac = j / 8.0;
Vector2 p = curve->interpolate(i, frac);
draw_line(prev_p, p, Color(0.5, 0.6, 1.0, 0.7), 2);
prev_p = p;
}
}
}
}
void Path2D::_curve_changed() {
if (is_inside_tree() && Engine::get_singleton()->is_editor_hint())
update();
}
void Path2D::set_curve(const Ref<Curve2D> &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<Curve2D> Path2D::get_curve() const {
return curve;
}
void Path2D::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_curve", "curve"), &Path2D::set_curve);
ClassDB::bind_method(D_METHOD("get_curve"), &Path2D::get_curve);
ClassDB::bind_method(D_METHOD("_curve_changed"), &Path2D::_curve_changed);
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve2D"), "set_curve", "get_curve");
}
Path2D::Path2D() {
set_curve(Ref<Curve2D>(memnew(Curve2D))); //create one by default
}
/////////////////////////////////////////////////////////////////////////////////
void PathFollow2D::_update_transform() {
if (!path)
return;
Ref<Curve2D> c = path->get_curve();
if (!c.is_valid())
return;
float path_length = c->get_baked_length();
float bounded_offset = offset;
if (loop)
bounded_offset = Math::fposmod(bounded_offset, path_length);
else
bounded_offset = CLAMP(bounded_offset, 0, path_length);
Vector2 pos = c->interpolate_baked(bounded_offset, cubic);
if (rotate) {
float ahead = bounded_offset + lookahead;
if (loop && ahead >= path_length) {
// If our lookahead will loop, we need to check if the path is closed.
int point_count = c->get_point_count();
if (point_count > 0) {
Vector2 start_point = c->get_point_position(0);
Vector2 end_point = c->get_point_position(point_count - 1);
if (start_point == end_point) {
// Since the path is closed we want to 'smooth off'
// the corner at the start/end.
// So we wrap the lookahead back round.
ahead = Math::fmod(ahead, path_length);
}
}
}
Vector2 ahead_pos = c->interpolate_baked(ahead, cubic);
Vector2 tangent_to_curve;
if (ahead_pos == pos) {
// This will happen at the end of non-looping or non-closed paths.
// We'll try a look behind instead, in order to get a meaningful angle.
tangent_to_curve =
(pos - c->interpolate_baked(bounded_offset - lookahead, cubic)).normalized();
} else {
tangent_to_curve = (ahead_pos - pos).normalized();
}
Vector2 normal_of_curve = -tangent_to_curve.tangent();
pos += tangent_to_curve * h_offset;
pos += normal_of_curve * v_offset;
set_rotation(tangent_to_curve.angle());
} else {
pos.x += h_offset;
pos.y += v_offset;
}
set_position(pos);
}
void PathFollow2D::_notification(int p_what) {
switch (p_what) {
case NOTIFICATION_ENTER_TREE: {
path = Object::cast_to<Path2D>(get_parent());
if (path) {
_update_transform();
}
} break;
case NOTIFICATION_EXIT_TREE: {
path = NULL;
} break;
}
}
void PathFollow2D::set_cubic_interpolation(bool p_enable) {
cubic = p_enable;
}
bool PathFollow2D::get_cubic_interpolation() const {
return cubic;
}
bool PathFollow2D::_set(const StringName &p_name, const Variant &p_value) {
if (p_name == SceneStringNames::get_singleton()->offset) {
set_offset(p_value);
} else if (p_name == SceneStringNames::get_singleton()->unit_offset) {
set_unit_offset(p_value);
} else if (p_name == SceneStringNames::get_singleton()->rotate) {
set_rotate(p_value);
} else if (p_name == SceneStringNames::get_singleton()->v_offset) {
set_v_offset(p_value);
} else if (p_name == SceneStringNames::get_singleton()->h_offset) {
set_h_offset(p_value);
} else if (String(p_name) == "cubic_interp") {
set_cubic_interpolation(p_value);
} else if (String(p_name) == "loop") {
set_loop(p_value);
} else if (String(p_name) == "lookahead") {
set_lookahead(p_value);
} else
return false;
return true;
}
bool PathFollow2D::_get(const StringName &p_name, Variant &r_ret) const {
if (p_name == SceneStringNames::get_singleton()->offset) {
r_ret = get_offset();
} else if (p_name == SceneStringNames::get_singleton()->unit_offset) {
r_ret = get_unit_offset();
} else if (p_name == SceneStringNames::get_singleton()->rotate) {
r_ret = is_rotating();
} else if (p_name == SceneStringNames::get_singleton()->v_offset) {
r_ret = get_v_offset();
} else if (p_name == SceneStringNames::get_singleton()->h_offset) {
r_ret = get_h_offset();
} else if (String(p_name) == "cubic_interp") {
r_ret = cubic;
} else if (String(p_name) == "loop") {
r_ret = loop;
} else if (String(p_name) == "lookahead") {
r_ret = lookahead;
} else
return false;
return true;
}
void PathFollow2D::_get_property_list(List<PropertyInfo> *p_list) const {
float max = 10000;
if (path && path->get_curve().is_valid())
max = path->get_curve()->get_baked_length();
p_list->push_back(PropertyInfo(Variant::REAL, "offset", PROPERTY_HINT_RANGE, "0," + rtos(max) + ",0.01"));
p_list->push_back(PropertyInfo(Variant::REAL, "unit_offset", PROPERTY_HINT_RANGE, "0,1,0.0001", PROPERTY_USAGE_EDITOR));
p_list->push_back(PropertyInfo(Variant::REAL, "h_offset"));
p_list->push_back(PropertyInfo(Variant::REAL, "v_offset"));
p_list->push_back(PropertyInfo(Variant::BOOL, "rotate"));
p_list->push_back(PropertyInfo(Variant::BOOL, "cubic_interp"));
p_list->push_back(PropertyInfo(Variant::BOOL, "loop"));
p_list->push_back(PropertyInfo(Variant::REAL, "lookahead", PROPERTY_HINT_RANGE, "0.001,1024.0,0.001"));
}
String PathFollow2D::get_configuration_warning() const {
if (!is_visible_in_tree() || !is_inside_tree())
return String();
if (!Object::cast_to<Path2D>(get_parent())) {
return TTR("PathFollow2D only works when set as a child of a Path2D node.");
}
return String();
}
void PathFollow2D::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_offset", "offset"), &PathFollow2D::set_offset);
ClassDB::bind_method(D_METHOD("get_offset"), &PathFollow2D::get_offset);
ClassDB::bind_method(D_METHOD("set_h_offset", "h_offset"), &PathFollow2D::set_h_offset);
ClassDB::bind_method(D_METHOD("get_h_offset"), &PathFollow2D::get_h_offset);
ClassDB::bind_method(D_METHOD("set_v_offset", "v_offset"), &PathFollow2D::set_v_offset);
ClassDB::bind_method(D_METHOD("get_v_offset"), &PathFollow2D::get_v_offset);
ClassDB::bind_method(D_METHOD("set_unit_offset", "unit_offset"), &PathFollow2D::set_unit_offset);
ClassDB::bind_method(D_METHOD("get_unit_offset"), &PathFollow2D::get_unit_offset);
ClassDB::bind_method(D_METHOD("set_rotate", "enable"), &PathFollow2D::set_rotate);
ClassDB::bind_method(D_METHOD("is_rotating"), &PathFollow2D::is_rotating);
ClassDB::bind_method(D_METHOD("set_cubic_interpolation", "enable"), &PathFollow2D::set_cubic_interpolation);
ClassDB::bind_method(D_METHOD("get_cubic_interpolation"), &PathFollow2D::get_cubic_interpolation);
ClassDB::bind_method(D_METHOD("set_loop", "loop"), &PathFollow2D::set_loop);
ClassDB::bind_method(D_METHOD("has_loop"), &PathFollow2D::has_loop);
}
void PathFollow2D::set_offset(float p_offset) {
offset = p_offset;
if (path)
_update_transform();
_change_notify("offset");
_change_notify("unit_offset");
}
void PathFollow2D::set_h_offset(float p_h_offset) {
h_offset = p_h_offset;
if (path)
_update_transform();
}
float PathFollow2D::get_h_offset() const {
return h_offset;
}
void PathFollow2D::set_v_offset(float p_v_offset) {
v_offset = p_v_offset;
if (path)
_update_transform();
}
float PathFollow2D::get_v_offset() const {
return v_offset;
}
float PathFollow2D::get_offset() const {
return offset;
}
void PathFollow2D::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 PathFollow2D::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 PathFollow2D::set_lookahead(float p_lookahead) {
lookahead = p_lookahead;
}
float PathFollow2D::get_lookahead() const {
return lookahead;
}
void PathFollow2D::set_rotate(bool p_rotate) {
rotate = p_rotate;
_update_transform();
}
bool PathFollow2D::is_rotating() const {
return rotate;
}
void PathFollow2D::set_loop(bool p_loop) {
loop = p_loop;
}
bool PathFollow2D::has_loop() const {
return loop;
}
PathFollow2D::PathFollow2D() {
offset = 0;
h_offset = 0;
v_offset = 0;
path = NULL;
rotate = true;
cubic = true;
loop = true;
lookahead = 4;
}