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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
292 lines
7.6 KiB
C++
292 lines
7.6 KiB
C++
/**************************************************************************/
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/* rect2.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 "rect2.h"
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#include "core/math/rect2i.h"
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#include "core/math/transform_2d.h"
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#include "core/string/ustring.h"
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bool Rect2::is_equal_approx(const Rect2 &p_rect) const {
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return position.is_equal_approx(p_rect.position) && size.is_equal_approx(p_rect.size);
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}
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bool Rect2::is_finite() const {
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return position.is_finite() && size.is_finite();
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}
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bool Rect2::intersects_segment(const Point2 &p_from, const Point2 &p_to, Point2 *r_pos, Point2 *r_normal) const {
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#ifdef MATH_CHECKS
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if (unlikely(size.x < 0 || size.y < 0)) {
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ERR_PRINT("Rect2 size is negative, this is not supported. Use Rect2.abs() to get a Rect2 with a positive size.");
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}
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#endif
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real_t min = 0, max = 1;
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int axis = 0;
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real_t sign = 0;
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for (int i = 0; i < 2; i++) {
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real_t seg_from = p_from[i];
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real_t seg_to = p_to[i];
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real_t box_begin = position[i];
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real_t box_end = box_begin + size[i];
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real_t cmin, cmax;
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real_t csign;
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if (seg_from < seg_to) {
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if (seg_from > box_end || seg_to < box_begin) {
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return false;
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}
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real_t length = seg_to - seg_from;
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cmin = (seg_from < box_begin) ? ((box_begin - seg_from) / length) : 0;
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cmax = (seg_to > box_end) ? ((box_end - seg_from) / length) : 1;
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csign = -1.0;
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} else {
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if (seg_to > box_end || seg_from < box_begin) {
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return false;
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}
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real_t length = seg_to - seg_from;
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cmin = (seg_from > box_end) ? (box_end - seg_from) / length : 0;
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cmax = (seg_to < box_begin) ? (box_begin - seg_from) / length : 1;
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csign = 1.0;
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}
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if (cmin > min) {
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min = cmin;
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axis = i;
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sign = csign;
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}
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if (cmax < max) {
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max = cmax;
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}
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if (max < min) {
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return false;
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}
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}
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Vector2 rel = p_to - p_from;
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if (r_normal) {
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Vector2 normal;
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normal[axis] = sign;
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*r_normal = normal;
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}
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if (r_pos) {
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*r_pos = p_from + rel * min;
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}
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return true;
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}
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bool Rect2::intersects_transformed(const Transform2D &p_xform, const Rect2 &p_rect) const {
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#ifdef MATH_CHECKS
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if (unlikely(size.x < 0 || size.y < 0 || p_rect.size.x < 0 || p_rect.size.y < 0)) {
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ERR_PRINT("Rect2 size is negative, this is not supported. Use Rect2.abs() to get a Rect2 with a positive size.");
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}
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#endif
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//SAT intersection between local and transformed rect2
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Vector2 xf_points[4] = {
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p_xform.xform(p_rect.position),
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p_xform.xform(Vector2(p_rect.position.x + p_rect.size.x, p_rect.position.y)),
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p_xform.xform(Vector2(p_rect.position.x, p_rect.position.y + p_rect.size.y)),
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p_xform.xform(Vector2(p_rect.position.x + p_rect.size.x, p_rect.position.y + p_rect.size.y)),
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};
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real_t low_limit;
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//base rect2 first (faster)
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if (xf_points[0].y > position.y) {
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goto next1;
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}
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if (xf_points[1].y > position.y) {
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goto next1;
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}
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if (xf_points[2].y > position.y) {
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goto next1;
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}
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if (xf_points[3].y > position.y) {
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goto next1;
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}
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return false;
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next1:
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low_limit = position.y + size.y;
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if (xf_points[0].y < low_limit) {
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goto next2;
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}
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if (xf_points[1].y < low_limit) {
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goto next2;
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}
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if (xf_points[2].y < low_limit) {
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goto next2;
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}
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if (xf_points[3].y < low_limit) {
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goto next2;
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}
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return false;
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next2:
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if (xf_points[0].x > position.x) {
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goto next3;
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}
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if (xf_points[1].x > position.x) {
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goto next3;
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}
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if (xf_points[2].x > position.x) {
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goto next3;
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}
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if (xf_points[3].x > position.x) {
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goto next3;
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}
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return false;
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next3:
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low_limit = position.x + size.x;
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if (xf_points[0].x < low_limit) {
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goto next4;
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}
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if (xf_points[1].x < low_limit) {
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goto next4;
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}
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if (xf_points[2].x < low_limit) {
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goto next4;
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}
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if (xf_points[3].x < low_limit) {
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goto next4;
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}
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return false;
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next4:
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Vector2 xf_points2[4] = {
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position,
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Vector2(position.x + size.x, position.y),
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Vector2(position.x, position.y + size.y),
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Vector2(position.x + size.x, position.y + size.y),
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};
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real_t maxa = p_xform.columns[0].dot(xf_points2[0]);
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real_t mina = maxa;
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real_t dp = p_xform.columns[0].dot(xf_points2[1]);
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maxa = MAX(dp, maxa);
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mina = MIN(dp, mina);
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dp = p_xform.columns[0].dot(xf_points2[2]);
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maxa = MAX(dp, maxa);
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mina = MIN(dp, mina);
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dp = p_xform.columns[0].dot(xf_points2[3]);
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maxa = MAX(dp, maxa);
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mina = MIN(dp, mina);
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real_t maxb = p_xform.columns[0].dot(xf_points[0]);
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real_t minb = maxb;
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dp = p_xform.columns[0].dot(xf_points[1]);
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maxb = MAX(dp, maxb);
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minb = MIN(dp, minb);
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dp = p_xform.columns[0].dot(xf_points[2]);
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maxb = MAX(dp, maxb);
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minb = MIN(dp, minb);
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dp = p_xform.columns[0].dot(xf_points[3]);
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maxb = MAX(dp, maxb);
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minb = MIN(dp, minb);
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if (mina > maxb) {
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return false;
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}
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if (minb > maxa) {
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return false;
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}
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maxa = p_xform.columns[1].dot(xf_points2[0]);
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mina = maxa;
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dp = p_xform.columns[1].dot(xf_points2[1]);
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maxa = MAX(dp, maxa);
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mina = MIN(dp, mina);
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dp = p_xform.columns[1].dot(xf_points2[2]);
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maxa = MAX(dp, maxa);
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mina = MIN(dp, mina);
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dp = p_xform.columns[1].dot(xf_points2[3]);
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maxa = MAX(dp, maxa);
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mina = MIN(dp, mina);
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maxb = p_xform.columns[1].dot(xf_points[0]);
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minb = maxb;
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dp = p_xform.columns[1].dot(xf_points[1]);
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maxb = MAX(dp, maxb);
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minb = MIN(dp, minb);
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dp = p_xform.columns[1].dot(xf_points[2]);
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maxb = MAX(dp, maxb);
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minb = MIN(dp, minb);
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dp = p_xform.columns[1].dot(xf_points[3]);
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maxb = MAX(dp, maxb);
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minb = MIN(dp, minb);
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if (mina > maxb) {
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return false;
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}
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if (minb > maxa) {
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return false;
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}
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return true;
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}
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Rect2::operator String() const {
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return "[P: " + position.operator String() + ", S: " + size + "]";
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}
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Rect2::operator Rect2i() const {
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return Rect2i(position, size);
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}
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