314 lines
9.8 KiB
C++
314 lines
9.8 KiB
C++
/**************************************************************************/
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/* transform_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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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 "transform_2d.h"
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#include "core/string/ustring.h"
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void Transform2D::invert() {
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// FIXME: this function assumes the basis is a rotation matrix, with no scaling.
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// Transform2D::affine_inverse can handle matrices with scaling, so GDScript should eventually use that.
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SWAP(columns[0][1], columns[1][0]);
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columns[2] = basis_xform(-columns[2]);
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}
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Transform2D Transform2D::inverse() const {
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Transform2D inv = *this;
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inv.invert();
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return inv;
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}
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void Transform2D::affine_invert() {
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real_t det = determinant();
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#ifdef MATH_CHECKS
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ERR_FAIL_COND(det == 0);
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#endif
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real_t idet = 1.0f / det;
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SWAP(columns[0][0], columns[1][1]);
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columns[0] *= Vector2(idet, -idet);
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columns[1] *= Vector2(-idet, idet);
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columns[2] = basis_xform(-columns[2]);
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}
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Transform2D Transform2D::affine_inverse() const {
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Transform2D inv = *this;
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inv.affine_invert();
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return inv;
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}
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void Transform2D::rotate(const real_t p_angle) {
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*this = Transform2D(p_angle, Vector2()) * (*this);
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}
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real_t Transform2D::get_skew() const {
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real_t det = determinant();
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return Math::acos(columns[0].normalized().dot(SIGN(det) * columns[1].normalized())) - (real_t)Math_PI * 0.5f;
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}
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void Transform2D::set_skew(const real_t p_angle) {
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real_t det = determinant();
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columns[1] = SIGN(det) * columns[0].rotated(((real_t)Math_PI * 0.5f + p_angle)).normalized() * columns[1].length();
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}
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real_t Transform2D::get_rotation() const {
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return Math::atan2(columns[0].y, columns[0].x);
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}
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void Transform2D::set_rotation(const real_t p_rot) {
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Size2 scale = get_scale();
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real_t cr = Math::cos(p_rot);
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real_t sr = Math::sin(p_rot);
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columns[0][0] = cr;
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columns[0][1] = sr;
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columns[1][0] = -sr;
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columns[1][1] = cr;
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set_scale(scale);
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}
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Transform2D::Transform2D(const real_t p_rot, const Vector2 &p_pos) {
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real_t cr = Math::cos(p_rot);
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real_t sr = Math::sin(p_rot);
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columns[0][0] = cr;
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columns[0][1] = sr;
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columns[1][0] = -sr;
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columns[1][1] = cr;
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columns[2] = p_pos;
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}
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Transform2D::Transform2D(const real_t p_rot, const Size2 &p_scale, const real_t p_skew, const Vector2 &p_pos) {
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columns[0][0] = Math::cos(p_rot) * p_scale.x;
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columns[1][1] = Math::cos(p_rot + p_skew) * p_scale.y;
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columns[1][0] = -Math::sin(p_rot + p_skew) * p_scale.y;
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columns[0][1] = Math::sin(p_rot) * p_scale.x;
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columns[2] = p_pos;
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}
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Size2 Transform2D::get_scale() const {
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real_t det_sign = SIGN(determinant());
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return Size2(columns[0].length(), det_sign * columns[1].length());
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}
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void Transform2D::set_scale(const Size2 &p_scale) {
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columns[0].normalize();
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columns[1].normalize();
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columns[0] *= p_scale.x;
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columns[1] *= p_scale.y;
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}
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void Transform2D::scale(const Size2 &p_scale) {
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scale_basis(p_scale);
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columns[2] *= p_scale;
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}
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void Transform2D::scale_basis(const Size2 &p_scale) {
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columns[0][0] *= p_scale.x;
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columns[0][1] *= p_scale.y;
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columns[1][0] *= p_scale.x;
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columns[1][1] *= p_scale.y;
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}
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void Transform2D::translate_local(const real_t p_tx, const real_t p_ty) {
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translate_local(Vector2(p_tx, p_ty));
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}
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void Transform2D::translate_local(const Vector2 &p_translation) {
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columns[2] += basis_xform(p_translation);
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}
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void Transform2D::orthonormalize() {
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// Gram-Schmidt Process
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Vector2 x = columns[0];
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Vector2 y = columns[1];
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x.normalize();
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y = y - x * x.dot(y);
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y.normalize();
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columns[0] = x;
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columns[1] = y;
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}
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Transform2D Transform2D::orthonormalized() const {
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Transform2D ortho = *this;
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ortho.orthonormalize();
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return ortho;
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}
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bool Transform2D::is_conformal() const {
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// Non-flipped case.
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if (Math::is_equal_approx(columns[0][0], columns[1][1]) && Math::is_equal_approx(columns[0][1], -columns[1][0])) {
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return true;
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}
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// Flipped case.
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if (Math::is_equal_approx(columns[0][0], -columns[1][1]) && Math::is_equal_approx(columns[0][1], columns[1][0])) {
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return true;
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}
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return false;
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}
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bool Transform2D::is_equal_approx(const Transform2D &p_transform) const {
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return columns[0].is_equal_approx(p_transform.columns[0]) && columns[1].is_equal_approx(p_transform.columns[1]) && columns[2].is_equal_approx(p_transform.columns[2]);
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}
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bool Transform2D::is_finite() const {
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return columns[0].is_finite() && columns[1].is_finite() && columns[2].is_finite();
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}
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Transform2D Transform2D::looking_at(const Vector2 &p_target) const {
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Transform2D return_trans = Transform2D(get_rotation(), get_origin());
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Vector2 target_position = affine_inverse().xform(p_target);
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return_trans.set_rotation(return_trans.get_rotation() + (target_position * get_scale()).angle());
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return return_trans;
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}
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bool Transform2D::operator==(const Transform2D &p_transform) const {
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for (int i = 0; i < 3; i++) {
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if (columns[i] != p_transform.columns[i]) {
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return false;
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}
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}
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return true;
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}
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bool Transform2D::operator!=(const Transform2D &p_transform) const {
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for (int i = 0; i < 3; i++) {
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if (columns[i] != p_transform.columns[i]) {
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return true;
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}
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}
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return false;
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}
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void Transform2D::operator*=(const Transform2D &p_transform) {
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columns[2] = xform(p_transform.columns[2]);
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real_t x0, x1, y0, y1;
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x0 = tdotx(p_transform.columns[0]);
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x1 = tdoty(p_transform.columns[0]);
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y0 = tdotx(p_transform.columns[1]);
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y1 = tdoty(p_transform.columns[1]);
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columns[0][0] = x0;
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columns[0][1] = x1;
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columns[1][0] = y0;
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columns[1][1] = y1;
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}
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Transform2D Transform2D::operator*(const Transform2D &p_transform) const {
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Transform2D t = *this;
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t *= p_transform;
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return t;
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}
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Transform2D Transform2D::scaled(const Size2 &p_scale) const {
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// Equivalent to left multiplication
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Transform2D copy = *this;
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copy.scale(p_scale);
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return copy;
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}
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Transform2D Transform2D::scaled_local(const Size2 &p_scale) const {
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// Equivalent to right multiplication
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return Transform2D(columns[0] * p_scale.x, columns[1] * p_scale.y, columns[2]);
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}
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Transform2D Transform2D::untranslated() const {
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Transform2D copy = *this;
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copy.columns[2] = Vector2();
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return copy;
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}
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Transform2D Transform2D::translated(const Vector2 &p_offset) const {
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// Equivalent to left multiplication
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return Transform2D(columns[0], columns[1], columns[2] + p_offset);
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}
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Transform2D Transform2D::translated_local(const Vector2 &p_offset) const {
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// Equivalent to right multiplication
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return Transform2D(columns[0], columns[1], columns[2] + basis_xform(p_offset));
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}
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Transform2D Transform2D::rotated(const real_t p_angle) const {
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// Equivalent to left multiplication
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return Transform2D(p_angle, Vector2()) * (*this);
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}
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Transform2D Transform2D::rotated_local(const real_t p_angle) const {
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// Equivalent to right multiplication
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return (*this) * Transform2D(p_angle, Vector2()); // Could be optimized, because origin transform can be skipped.
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}
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real_t Transform2D::determinant() const {
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return columns[0].x * columns[1].y - columns[0].y * columns[1].x;
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}
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Transform2D Transform2D::interpolate_with(const Transform2D &p_transform, const real_t p_weight) const {
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return Transform2D(
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Math::lerp_angle(get_rotation(), p_transform.get_rotation(), p_weight),
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get_scale().lerp(p_transform.get_scale(), p_weight),
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Math::lerp_angle(get_skew(), p_transform.get_skew(), p_weight),
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get_origin().lerp(p_transform.get_origin(), p_weight));
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}
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void Transform2D::operator*=(const real_t p_val) {
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columns[0] *= p_val;
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columns[1] *= p_val;
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columns[2] *= p_val;
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}
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Transform2D Transform2D::operator*(const real_t p_val) const {
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Transform2D ret(*this);
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ret *= p_val;
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return ret;
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}
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void Transform2D::operator/=(const real_t p_val) {
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columns[0] /= p_val;
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columns[1] /= p_val;
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columns[2] /= p_val;
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}
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Transform2D Transform2D::operator/(const real_t p_val) const {
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Transform2D ret(*this);
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ret /= p_val;
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return ret;
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}
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Transform2D::operator String() const {
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return "[X: " + columns[0].operator String() +
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", Y: " + columns[1].operator String() +
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", O: " + columns[2].operator String() + "]";
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}
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