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pandemonium_engine/scene/2d/path_2d.cpp

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/*************************************************************************/
/* path_2d.cpp */
/*************************************************************************/
/* This file is part of: */
/* PANDEMONIUM ENGINE */
/* https://github.com/Relintai/pandemonium_engine */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* */
/* 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 "core/config/engine.h"
#include "scene/main/scene_string_names.h"
#include "scene/resources/curve.h"
#ifdef TOOLS_ENABLED
#include "editor/editor_scale.h"
#endif
#ifdef TOOLS_ENABLED
Rect2 Path2D::_edit_get_rect() const {
if (!curve.is_valid() || curve->get_point_count() == 0) {
return Rect2(0, 0, 0, 0);
}
Rect2 aabb = Rect2(curve->get_point_position(0), Vector2(0, 0));
for (int i = 0; i < curve->get_point_count(); i++) {
for (int j = 0; j <= 8; j++) {
real_t frac = j / 8.0;
Vector2 p = curve->interpolate(i, frac);
aabb.expand_to(p);
}
}
return aabb;
}
bool Path2D::_edit_use_rect() const {
return curve.is_valid() && curve->get_point_count() != 0;
}
bool Path2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
if (curve.is_null()) {
return false;
}
for (int i = 0; i < curve->get_point_count(); i++) {
Vector2 s[2];
s[0] = curve->get_point_position(i);
for (int j = 1; j <= 8; j++) {
real_t frac = j / 8.0;
s[1] = curve->interpolate(i, frac);
Vector2 p = Geometry::get_closest_point_to_segment_2d(p_point, s);
if (p.distance_to(p_point) <= p_tolerance) {
return true;
}
s[0] = s[1];
}
}
return false;
}
#endif
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_paths_hint()) {
return;
}
if (curve->get_point_count() < 2) {
return;
}
#ifdef TOOLS_ENABLED
const float line_width = get_tree()->get_debug_paths_width() * EDSCALE;
#else
const float line_width = get_tree()->get_debug_paths_width();
#endif
_cached_draw_pts.resize(curve->get_point_count() * 8);
int count = 0;
for (int i = 0; i < curve->get_point_count(); i++) {
for (int j = 0; j < 8; j++) {
real_t frac = j * (1.0 / 8.0);
Vector2 p = curve->interpolate(i, frac);
_cached_draw_pts.set(count++, p);
}
}
draw_polyline(_cached_draw_pts, get_tree()->get_debug_paths_color(), line_width, true);
}
}
void Path2D::_curve_changed() {
if (!is_inside_tree()) {
return;
}
if (!Engine::get_singleton()->is_editor_hint() && !get_tree()->is_debugging_paths_hint()) {
return;
}
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
set_self_modulate(Color(0.5, 0.6, 1.0, 0.7));
}
/////////////////////////////////////////////////////////////////////////////////
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();
if (path_length == 0) {
return;
}
Vector2 pos = c->interpolate_baked(offset, cubic);
if (rotate) {
float ahead = 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(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 = nullptr;
} break;
}
}
void PathFollow2D::set_cubic_interpolation(bool p_enable) {
cubic = p_enable;
}
bool PathFollow2D::get_cubic_interpolation() const {
return cubic;
}
void PathFollow2D::_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_lesser,or_greater";
}
}
String PathFollow2D::get_configuration_warning() const {
if (!is_visible_in_tree() || !is_inside_tree()) {
return String();
}
String warning = Node2D::get_configuration_warning();
if (!Object::cast_to<Path2D>(get_parent())) {
if (warning != String()) {
warning += "\n\n";
}
warning += TTR("PathFollow2D only works when set as a child of a Path2D node.");
}
return warning;
}
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);
ClassDB::bind_method(D_METHOD("set_lookahead", "lookahead"), &PathFollow2D::set_lookahead);
ClassDB::bind_method(D_METHOD("get_lookahead"), &PathFollow2D::get_lookahead);
ADD_PROPERTY(PropertyInfo(Variant::REAL, "offset", PROPERTY_HINT_RANGE, "0,10000,0.01,or_lesser,or_greater"), "set_offset", "get_offset");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "unit_offset", PROPERTY_HINT_RANGE, "0,1,0.0001,or_lesser,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::BOOL, "rotate"), "set_rotate", "is_rotating");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "cubic_interp"), "set_cubic_interpolation", "get_cubic_interpolation");
ADD_PROPERTY(PropertyInfo(Variant::BOOL, "loop"), "set_loop", "has_loop");
ADD_PROPERTY(PropertyInfo(Variant::REAL, "lookahead", PROPERTY_HINT_RANGE, "0.001,1024.0,0.001"), "set_lookahead", "get_lookahead");
}
void PathFollow2D::set_offset(float p_offset) {
ERR_FAIL_COND(!isfinite(p_offset));
offset = p_offset;
if (path) {
if (path->get_curve().is_valid()) {
float path_length = path->get_curve()->get_baked_length();
if (loop) {
offset = Math::fposmod(offset, path_length);
if (!Math::is_zero_approx(p_offset) && Math::is_zero_approx(offset)) {
offset = path_length;
}
} else {
offset = CLAMP(offset, 0, path_length);
}
}
_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 = nullptr;
rotate = true;
cubic = true;
loop = true;
lookahead = 4;
}
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