401 lines
12 KiB
C++
401 lines
12 KiB
C++
/*************************************************************************/
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/* path_2d.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "path_2d.h"
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#include "core/config/engine.h"
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#include "core/math/geometry_2d.h"
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#include "scene/scene_string_names.h"
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#ifdef TOOLS_ENABLED
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#include "editor/editor_scale.h"
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#endif
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#ifdef TOOLS_ENABLED
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Rect2 Path2D::_edit_get_rect() const {
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if (!curve.is_valid() || curve->get_point_count() == 0) {
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return Rect2(0, 0, 0, 0);
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}
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Rect2 aabb = Rect2(curve->get_point_position(0), Vector2(0, 0));
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for (int i = 0; i < curve->get_point_count(); i++) {
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for (int j = 0; j <= 8; j++) {
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real_t frac = j / 8.0;
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Vector2 p = curve->interpolate(i, frac);
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aabb.expand_to(p);
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}
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}
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return aabb;
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}
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bool Path2D::_edit_use_rect() const {
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return curve.is_valid() && curve->get_point_count() != 0;
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}
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bool Path2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const {
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if (curve.is_null()) {
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return false;
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}
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for (int i = 0; i < curve->get_point_count(); i++) {
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Vector2 s[2];
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s[0] = curve->get_point_position(i);
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for (int j = 1; j <= 8; j++) {
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real_t frac = j / 8.0;
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s[1] = curve->interpolate(i, frac);
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Vector2 p = Geometry2D::get_closest_point_to_segment(p_point, s);
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if (p.distance_to(p_point) <= p_tolerance) {
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return true;
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}
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s[0] = s[1];
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}
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}
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return false;
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}
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#endif
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void Path2D::_notification(int p_what) {
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if (p_what == NOTIFICATION_DRAW && curve.is_valid()) {
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//draw the curve!!
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if (!Engine::get_singleton()->is_editor_hint() && !get_tree()->is_debugging_navigation_hint()) {
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return;
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}
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#ifdef TOOLS_ENABLED
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const float line_width = 2 * EDSCALE;
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#else
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const float line_width = 2;
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#endif
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const Color color = Color(0.5, 0.6, 1.0, 0.7);
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for (int i = 0; i < curve->get_point_count(); i++) {
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Vector2 prev_p = curve->get_point_position(i);
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for (int j = 1; j <= 8; j++) {
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real_t frac = j / 8.0;
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Vector2 p = curve->interpolate(i, frac);
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draw_line(prev_p, p, color, line_width);
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prev_p = p;
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}
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}
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}
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}
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void Path2D::_curve_changed() {
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if (!is_inside_tree()) {
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return;
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}
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if (!Engine::get_singleton()->is_editor_hint() && !get_tree()->is_debugging_navigation_hint()) {
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return;
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}
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update();
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}
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void Path2D::set_curve(const Ref<Curve2D> &p_curve) {
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if (curve.is_valid()) {
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curve->disconnect("changed", callable_mp(this, &Path2D::_curve_changed));
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}
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curve = p_curve;
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if (curve.is_valid()) {
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curve->connect("changed", callable_mp(this, &Path2D::_curve_changed));
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}
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_curve_changed();
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}
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Ref<Curve2D> Path2D::get_curve() const {
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return curve;
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}
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void Path2D::_bind_methods() {
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ClassDB::bind_method(D_METHOD("set_curve", "curve"), &Path2D::set_curve);
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ClassDB::bind_method(D_METHOD("get_curve"), &Path2D::get_curve);
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ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve2D", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_EDITOR_INSTANTIATE_OBJECT), "set_curve", "get_curve");
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}
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/////////////////////////////////////////////////////////////////////////////////
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void PathFollow2D::_update_transform() {
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if (!path) {
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return;
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}
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Ref<Curve2D> c = path->get_curve();
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if (!c.is_valid()) {
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return;
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}
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float path_length = c->get_baked_length();
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if (path_length == 0) {
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return;
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}
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Vector2 pos = c->interpolate_baked(offset, cubic);
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if (rotate) {
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float ahead = offset + lookahead;
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if (loop && ahead >= path_length) {
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// If our lookahead will loop, we need to check if the path is closed.
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int point_count = c->get_point_count();
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if (point_count > 0) {
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Vector2 start_point = c->get_point_position(0);
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Vector2 end_point = c->get_point_position(point_count - 1);
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if (start_point == end_point) {
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// Since the path is closed we want to 'smooth off'
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// the corner at the start/end.
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// So we wrap the lookahead back round.
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ahead = Math::fmod(ahead, path_length);
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}
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}
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}
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Vector2 ahead_pos = c->interpolate_baked(ahead, cubic);
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Vector2 tangent_to_curve;
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if (ahead_pos == pos) {
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// This will happen at the end of non-looping or non-closed paths.
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// We'll try a look behind instead, in order to get a meaningful angle.
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tangent_to_curve =
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(pos - c->interpolate_baked(offset - lookahead, cubic)).normalized();
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} else {
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tangent_to_curve = (ahead_pos - pos).normalized();
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}
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Vector2 normal_of_curve = -tangent_to_curve.tangent();
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pos += tangent_to_curve * h_offset;
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pos += normal_of_curve * v_offset;
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set_rotation(tangent_to_curve.angle());
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} else {
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pos.x += h_offset;
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pos.y += v_offset;
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}
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set_position(pos);
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}
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void PathFollow2D::_notification(int p_what) {
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switch (p_what) {
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case NOTIFICATION_ENTER_TREE: {
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path = Object::cast_to<Path2D>(get_parent());
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if (path) {
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_update_transform();
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}
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} break;
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case NOTIFICATION_EXIT_TREE: {
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path = nullptr;
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} break;
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}
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}
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void PathFollow2D::set_cubic_interpolation(bool p_enable) {
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cubic = p_enable;
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}
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bool PathFollow2D::get_cubic_interpolation() const {
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return cubic;
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}
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void PathFollow2D::_validate_property(PropertyInfo &property) const {
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if (property.name == "offset") {
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float max = 10000;
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if (path && path->get_curve().is_valid()) {
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max = path->get_curve()->get_baked_length();
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}
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property.hint_string = "0," + rtos(max) + ",0.01,or_lesser,or_greater";
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}
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}
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String PathFollow2D::get_configuration_warning() const {
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if (!is_visible_in_tree() || !is_inside_tree()) {
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return String();
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}
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String warning = Node2D::get_configuration_warning();
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if (!Object::cast_to<Path2D>(get_parent())) {
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if (!warning.empty()) {
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warning += "\n\n";
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}
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warning += TTR("PathFollow2D only works when set as a child of a Path2D node.");
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}
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return warning;
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}
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void PathFollow2D::_bind_methods() {
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ClassDB::bind_method(D_METHOD("set_offset", "offset"), &PathFollow2D::set_offset);
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ClassDB::bind_method(D_METHOD("get_offset"), &PathFollow2D::get_offset);
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ClassDB::bind_method(D_METHOD("set_h_offset", "h_offset"), &PathFollow2D::set_h_offset);
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ClassDB::bind_method(D_METHOD("get_h_offset"), &PathFollow2D::get_h_offset);
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ClassDB::bind_method(D_METHOD("set_v_offset", "v_offset"), &PathFollow2D::set_v_offset);
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ClassDB::bind_method(D_METHOD("get_v_offset"), &PathFollow2D::get_v_offset);
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ClassDB::bind_method(D_METHOD("set_unit_offset", "unit_offset"), &PathFollow2D::set_unit_offset);
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ClassDB::bind_method(D_METHOD("get_unit_offset"), &PathFollow2D::get_unit_offset);
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ClassDB::bind_method(D_METHOD("set_rotate", "enable"), &PathFollow2D::set_rotate);
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ClassDB::bind_method(D_METHOD("is_rotating"), &PathFollow2D::is_rotating);
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ClassDB::bind_method(D_METHOD("set_cubic_interpolation", "enable"), &PathFollow2D::set_cubic_interpolation);
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ClassDB::bind_method(D_METHOD("get_cubic_interpolation"), &PathFollow2D::get_cubic_interpolation);
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ClassDB::bind_method(D_METHOD("set_loop", "loop"), &PathFollow2D::set_loop);
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ClassDB::bind_method(D_METHOD("has_loop"), &PathFollow2D::has_loop);
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ClassDB::bind_method(D_METHOD("set_lookahead", "lookahead"), &PathFollow2D::set_lookahead);
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ClassDB::bind_method(D_METHOD("get_lookahead"), &PathFollow2D::get_lookahead);
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ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "offset", PROPERTY_HINT_RANGE, "0,10000,0.01,or_lesser,or_greater"), "set_offset", "get_offset");
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ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "unit_offset", PROPERTY_HINT_RANGE, "0,1,0.0001,or_lesser,or_greater", PROPERTY_USAGE_EDITOR), "set_unit_offset", "get_unit_offset");
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ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "h_offset"), "set_h_offset", "get_h_offset");
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ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "v_offset"), "set_v_offset", "get_v_offset");
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ADD_PROPERTY(PropertyInfo(Variant::BOOL, "rotate"), "set_rotate", "is_rotating");
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ADD_PROPERTY(PropertyInfo(Variant::BOOL, "cubic_interp"), "set_cubic_interpolation", "get_cubic_interpolation");
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ADD_PROPERTY(PropertyInfo(Variant::BOOL, "loop"), "set_loop", "has_loop");
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ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "lookahead", PROPERTY_HINT_RANGE, "0.001,1024.0,0.001"), "set_lookahead", "get_lookahead");
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}
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void PathFollow2D::set_offset(float p_offset) {
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offset = p_offset;
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if (path) {
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if (path->get_curve().is_valid()) {
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float path_length = path->get_curve()->get_baked_length();
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if (loop) {
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offset = Math::fposmod(offset, path_length);
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if (!Math::is_zero_approx(p_offset) && Math::is_zero_approx(offset)) {
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offset = path_length;
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}
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} else {
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offset = CLAMP(offset, 0, path_length);
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}
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}
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_update_transform();
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}
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_change_notify("offset");
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_change_notify("unit_offset");
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}
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void PathFollow2D::set_h_offset(float p_h_offset) {
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h_offset = p_h_offset;
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if (path) {
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_update_transform();
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}
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}
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float PathFollow2D::get_h_offset() const {
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return h_offset;
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}
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void PathFollow2D::set_v_offset(float p_v_offset) {
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v_offset = p_v_offset;
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if (path) {
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_update_transform();
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}
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}
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float PathFollow2D::get_v_offset() const {
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return v_offset;
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}
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float PathFollow2D::get_offset() const {
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return offset;
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}
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void PathFollow2D::set_unit_offset(float p_unit_offset) {
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if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length()) {
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set_offset(p_unit_offset * path->get_curve()->get_baked_length());
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}
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}
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float PathFollow2D::get_unit_offset() const {
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if (path && path->get_curve().is_valid() && path->get_curve()->get_baked_length()) {
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return get_offset() / path->get_curve()->get_baked_length();
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} else {
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return 0;
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}
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}
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void PathFollow2D::set_lookahead(float p_lookahead) {
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lookahead = p_lookahead;
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}
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float PathFollow2D::get_lookahead() const {
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return lookahead;
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}
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void PathFollow2D::set_rotate(bool p_rotate) {
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rotate = p_rotate;
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_update_transform();
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}
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bool PathFollow2D::is_rotating() const {
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return rotate;
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}
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void PathFollow2D::set_loop(bool p_loop) {
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loop = p_loop;
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}
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bool PathFollow2D::has_loop() const {
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return loop;
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}
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PathFollow2D::PathFollow2D() {
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offset = 0;
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h_offset = 0;
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v_offset = 0;
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path = nullptr;
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rotate = true;
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cubic = true;
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loop = true;
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lookahead = 4;
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}
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