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https://github.com/RGBCube/serenity
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LibGfx: Add a Line class and a Rect<T>::RelativeLocation class
These helpers will be useful in preparation for supporting multiple displays, e.g. to measure distances to other screens or figure out where rectangles are located relative to each other.
This commit is contained in:
Tom
Andreas Kling
parent
20c066b8e0
commit
499c33ae0c
4 changed files with 458 additions and 0 deletions
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@ -16,6 +16,10 @@ class Emoji;
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class Font;
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class GlyphBitmap;
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class ImageDecoder;
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template<typename T>
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class Line;
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class Painter;
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class Palette;
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class PaletteImpl;
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@ -34,6 +38,9 @@ class Size;
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template<typename T>
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class Rect;
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using IntLine = Line<int>;
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using FloatLine = Line<float>;
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using IntRect = Rect<int>;
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using FloatRect = Rect<float>;
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155
Userland/Libraries/LibGfx/Line.h
Normal file
155
Userland/Libraries/LibGfx/Line.h
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@ -0,0 +1,155 @@
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/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Optional.h>
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#include <AK/StdLibExtras.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/Point.h>
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#include <LibGfx/Rect.h>
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#include <math.h>
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#include <stdlib.h>
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namespace Gfx {
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template<typename T>
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class Line {
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public:
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Line() { }
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Line(Point<T> a, Point<T> b)
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: m_a(a)
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, m_b(b)
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{
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}
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template<typename U>
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Line(U a, U b)
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: m_a(a)
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, m_b(b)
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{
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}
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template<typename U>
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explicit Line(Line<U> const& other)
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: m_a(other.a())
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, m_b(other.b())
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{
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}
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bool intersects(Line const& other) const
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{
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return intersected(other).has_value();
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}
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Optional<Point<T>> intersected(Line const& other) const
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{
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auto cross_product = [](Point<T> const& p1, Point<T> const& p2) {
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return p1.x() * p2.y() - p1.y() * p2.x();
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};
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auto r = m_b - m_a;
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auto s = other.m_b - other.m_a;
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auto delta_a = other.m_a - m_a;
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auto num = cross_product(delta_a, r);
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auto denom = cross_product(r, s);
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if (denom == 0) {
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if (num == 0) {
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// Lines are collinear, check if line ends are touching
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if (m_a == other.m_a || m_a == other.m_b)
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return m_a;
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if (m_b == other.m_a || m_b == other.m_b)
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return m_b;
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// Check if they're overlapping
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if (!(m_b.x() - m_a.x() < 0 && m_b.x() - other.m_a.x() < 0 && other.m_b.x() - m_a.x() && other.m_b.x() - other.m_a.x())) {
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// Overlapping
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// TODO find center point?
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}
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if (!(m_b.y() - m_a.y() < 0 && m_b.y() - other.m_a.y() < 0 && other.m_b.y() - m_a.y() && other.m_b.y() - other.m_a.y())) {
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// Overlapping
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// TODO find center point?
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}
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return {};
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} else {
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// Lines are parallel and not intersecting
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return {};
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}
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}
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auto u = static_cast<float>(num) / static_cast<float>(denom);
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if (u < 0.0f || u > 1.0f) {
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// Lines are not parallel and don't intersect
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return {};
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}
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auto t = static_cast<float>(cross_product(delta_a, s)) / static_cast<float>(denom);
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if (t < 0.0f || t > 1.0f) {
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// Lines are not parallel and don't intersect
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return {};
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}
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// TODO: round if we're dealing with int
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return Point<T> { m_a.x() + static_cast<T>(t * r.x()), m_a.y() + static_cast<T>(t * r.y()) };
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}
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float length() const
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{
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return m_a.distance_from(m_b);
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}
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Point<T> closest_to(Point<T> const& point) const
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{
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if (m_a == m_b)
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return m_a;
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auto delta_a = point.x() - m_a.x();
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auto delta_b = point.y() - m_a.y();
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auto delta_c = m_b.x() - m_a.x();
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auto delta_d = m_b.y() - m_a.y();
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auto len_sq = delta_c * delta_c + delta_d * delta_d;
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float param = -1.0;
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if (len_sq != 0)
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param = static_cast<float>(delta_a * delta_c + delta_b * delta_d) / static_cast<float>(len_sq);
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if (param < 0)
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return m_a;
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if (param > 1)
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return m_b;
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// TODO: round if we're dealing with int
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return { static_cast<T>(m_a.x() + param * delta_c), static_cast<T>(m_a.y() + param * delta_d) };
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}
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Line<T> shortest_line_to(Point<T> const& point) const
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{
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return { closest_to(point), point };
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}
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float distance_to(Point<T> const& point) const
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{
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return shortest_line_to(point).length();
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}
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Point<T> const& a() const { return m_a; }
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Point<T> const& b() const { return m_b; }
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void set_a(Point<T> const& a) { m_a = a; }
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void set_b(Point<T> const& b) { m_b = b; }
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String to_string() const;
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private:
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Point<T> m_a;
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Point<T> m_b;
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};
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template<>
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inline String IntLine::to_string() const
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{
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return String::formatted("[{},{} -> {}x{}]", m_a.x(), m_a.y(), m_b.x(), m_b.y());
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}
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template<>
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inline String FloatLine::to_string() const
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{
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return String::formatted("[{},{} {}x{}]", m_a.x(), m_a.y(), m_b.x(), m_b.y());
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}
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}
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@ -7,12 +7,183 @@
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#include <AK/StdLibExtras.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <LibGfx/Line.h>
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#include <LibGfx/Rect.h>
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#include <LibIPC/Decoder.h>
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#include <LibIPC/Encoder.h>
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namespace Gfx {
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template<typename T>
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Rect<T>::RelativeLocation::RelativeLocation(Rect<T> const& base_rect, Rect<T> const& other_rect)
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{
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if (base_rect.is_empty() || other_rect.is_empty())
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return;
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auto parts = base_rect.shatter(other_rect);
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for (auto& part : parts) {
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if (part.x() < other_rect.x()) {
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if (part.y() < other_rect.y())
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m_top_left = true;
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if ((part.y() >= other_rect.y() && part.y() < other_rect.bottom()) || (part.y() <= other_rect.bottom() && part.bottom() > other_rect.y()))
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m_left = true;
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if (part.y() >= other_rect.bottom() || part.bottom() > other_rect.y())
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m_bottom_left = true;
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}
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if (part.x() >= other_rect.x() || part.right() > other_rect.x()) {
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if (part.y() < other_rect.y())
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m_top = true;
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if (part.y() >= other_rect.bottom() || part.bottom() > other_rect.bottom())
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m_bottom = true;
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}
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if (part.x() >= other_rect.right() || part.right() > other_rect.right()) {
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if (part.y() < other_rect.y())
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m_top_right = true;
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if ((part.y() >= other_rect.y() && part.y() < other_rect.bottom()) || (part.y() <= other_rect.bottom() && part.bottom() > other_rect.y()))
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m_right = true;
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if (part.y() >= other_rect.bottom() || part.bottom() > other_rect.y())
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m_bottom_right = true;
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}
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}
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}
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template<typename T>
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Vector<Point<T>, 2> Rect<T>::intersected(Line<T> const& line) const
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{
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if (is_empty())
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return {};
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Vector<Point<T>, 2> points;
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if (auto point = line.intersected({ top_left(), top_right() }); point.has_value())
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points.append({ point.value().x(), y() });
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if (auto point = line.intersected({ bottom_left(), bottom_right() }); point.has_value()) {
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points.append({ point.value().x(), bottom() });
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if (points.size() == 2)
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return points;
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}
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if (height() > 2) {
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if (auto point = line.intersected({ { x(), y() + 1 }, { x(), bottom() - 1 } }); point.has_value()) {
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points.append({ x(), point.value().y() });
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if (points.size() == 2)
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return points;
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}
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if (auto point = line.intersected({ { right(), y() + 1 }, { right(), bottom() - 1 } }); point.has_value())
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points.append({ right(), point.value().y() });
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}
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return points;
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}
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template<typename T>
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float Rect<T>::center_point_distance_to(Rect<T> const& other) const
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{
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return Line { center(), other.center() }.length();
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}
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template<typename T>
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Vector<Point<T>, 2> Rect<T>::closest_outside_center_points(Rect<T> const& other) const
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{
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if (intersects(other))
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return {};
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Line centers_line { center(), other.center() };
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auto points_this = intersected(centers_line);
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VERIFY(points_this.size() == 1);
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auto points_other = other.intersected(centers_line);
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VERIFY(points_other.size() == 1);
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return { points_this[0], points_other[0] };
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}
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template<typename T>
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float Rect<T>::outside_center_point_distance_to(Rect<T> const& other) const
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{
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auto points = closest_outside_center_points(other);
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if (points.is_empty())
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return 0.0;
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return Line { points[0], points[0] }.length();
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}
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template<typename T>
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Rect<T> Rect<T>::constrained_to(Rect<T> const& constrain_rect) const
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{
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if (constrain_rect.contains(*this))
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return *this;
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T move_x = 0, move_y = 0;
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if (right() > constrain_rect.right())
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move_x = constrain_rect.right() - right();
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if (bottom() > constrain_rect.bottom())
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move_y = constrain_rect.bottom() - bottom();
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if (x() < constrain_rect.x())
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move_x = x() - constrain_rect.x();
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if (y() < constrain_rect.y())
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move_y = y() - constrain_rect.y();
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auto rect = *this;
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if (move_x != 0 || move_y != 0)
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rect.translate_by(move_x, move_y);
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return rect;
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}
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template<typename T>
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Rect<T> Rect<T>::aligned_within(Size<T> const& rect_size, Point<T> const& align_at, TextAlignment alignment) const
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{
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if (rect_size.is_empty())
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return {};
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if (!size().contains(rect_size))
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return {};
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if (!contains(align_at))
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return {};
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Rect<T> rect;
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switch (alignment) {
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case TextAlignment::TopLeft:
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rect = { align_at, rect_size };
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break;
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case TextAlignment::CenterLeft:
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rect = { { align_at.x(), align_at.y() - rect_size.height() / 2 }, rect_size };
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break;
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case TextAlignment::Center:
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rect = { { align_at.x() - rect_size.width() / 2, align_at.y() - rect_size.height() / 2 }, rect_size };
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break;
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case TextAlignment::CenterRight:
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rect = { { align_at.x() - rect_size.width() / 2, align_at.y() }, rect_size };
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break;
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case TextAlignment::TopRight:
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rect = { { align_at.x() - rect_size.width(), align_at.y() }, rect_size };
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break;
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case TextAlignment::BottomLeft:
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rect = { { align_at.x(), align_at.y() - rect_size.width() }, rect_size };
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break;
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case TextAlignment::BottomRight:
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rect = { { align_at.x() - rect_size.width(), align_at.y() - rect_size.width() }, rect_size };
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break;
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}
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return rect.constrained_to(*this);
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}
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template<typename T>
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Point<T> Rect<T>::closest_to(Point<T> const& point) const
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{
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if (is_empty())
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return {};
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Optional<Point<T>> closest_point;
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float closest_distance = 0.0;
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auto check_distance = [&](const Line<T>& line) {
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auto point_on_line = line.closest_to(point);
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auto distance = Line { point_on_line, point }.length();
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if (!closest_point.has_value() || distance < closest_distance) {
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closest_point = point_on_line;
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closest_distance = distance;
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}
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};
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check_distance({ top_left(), top_right() });
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check_distance({ bottom_left(), bottom_right() });
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if (height() > 2) {
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check_distance({ { x(), y() + 1 }, { x(), bottom() - 1 } });
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check_distance({ { right(), y() + 1 }, { right(), bottom() - 1 } });
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}
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VERIFY(closest_point.has_value());
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VERIFY(side(closest_point.value()) != Side::None);
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return closest_point.value();
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}
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template<typename T>
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void Rect<T>::intersect(Rect<T> const& other)
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{
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@ -444,6 +444,131 @@ public:
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return intersection(*this, other);
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}
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[[nodiscard]] Vector<Point<T>, 2> intersected(Line<T> const&) const;
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[[nodiscard]] float center_point_distance_to(Rect<T> const&) const;
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[[nodiscard]] Vector<Point<T>, 2> closest_outside_center_points(Rect<T> const&) const;
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[[nodiscard]] float outside_center_point_distance_to(Rect<T> const&) const;
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[[nodiscard]] Rect<T> constrained_to(Rect<T> const&) const;
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[[nodiscard]] Rect<T> aligned_within(Size<T> const&, Point<T> const&, TextAlignment = TextAlignment::Center) const;
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[[nodiscard]] Point<T> closest_to(Point<T> const&) const;
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class RelativeLocation {
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friend class Rect<T>;
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RelativeLocation(Rect<T> const& base_rect, Rect<T> const& other_rect);
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public:
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RelativeLocation() = default;
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bool top_left() const { return m_top_left; }
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bool top() const { return m_top; }
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bool top_right() const { return m_top_right; }
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bool left() const { return m_left; }
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bool right() const { return m_right; }
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bool bottom_left() const { return m_bottom_left; }
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bool bottom() const { return m_bottom; }
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bool bottom_right() const { return m_bottom_right; }
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bool anywhere_above() const { return m_top_left || m_top || m_top_right; }
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bool anywhere_below() const { return m_bottom_left || m_bottom || m_bottom_right; }
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bool anywhere_left() const { return m_top_left || m_left || m_bottom_left; }
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bool anywhere_right() const { return m_top_right || m_right || m_bottom_right; }
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private:
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bool m_top_left : 1 { false };
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bool m_top : 1 { false };
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bool m_top_right : 1 { false };
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bool m_left : 1 { false };
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bool m_right : 1 { false };
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bool m_bottom_left : 1 { false };
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bool m_bottom : 1 { false };
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bool m_bottom_right : 1 { false };
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};
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[[nodiscard]] RelativeLocation relative_location_to(Rect<T> const& other) const
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{
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return RelativeLocation(*this, other);
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}
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enum class Side {
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None = 0,
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Left,
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Top,
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Right,
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Bottom
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};
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[[nodiscard]] Side side(Point<T> const& point) const
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{
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if (is_empty())
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return Side::None;
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if (point.y() == y() || point.y() == bottom())
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return (point.x() >= x() && point.x() <= right()) ? (point.y() == y() ? Side::Top : Side::Bottom) : Side::None;
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if (point.x() == x() || point.x() == right())
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return (point.y() > y() && point.y() < bottom()) ? (point.x() == x() ? Side::Left : Side::Right) : Side::None;
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return Side::None;
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}
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[[nodiscard]] Rect<T> rect_on_side(Side side, Rect<T> const& other) const
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{
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switch (side) {
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case Side::None:
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break;
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case Side::Left:
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// Return the area in other that is to the left of this rect
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if (other.x() < x()) {
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if (other.right() >= x())
|
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return { other.location(), { x() - other.x(), other.height() } };
|
||||
else
|
||||
return other;
|
||||
}
|
||||
break;
|
||||
case Side::Top:
|
||||
// Return the area in other that is above this rect
|
||||
if (other.y() < y()) {
|
||||
if (other.bottom() >= y())
|
||||
return { other.location(), { other.width(), y() - other.y() } };
|
||||
else
|
||||
return other;
|
||||
}
|
||||
break;
|
||||
case Side::Right:
|
||||
// Return the area in other that is to the right of this rect
|
||||
if (other.right() >= x()) {
|
||||
if (other.x() <= right())
|
||||
return { { right() + 1, other.y() }, { other.width() - (right() - other.x()), other.height() } };
|
||||
else
|
||||
return other;
|
||||
}
|
||||
break;
|
||||
case Side::Bottom:
|
||||
// Return the area in other that is below this rect
|
||||
if (other.bottom() >= y()) {
|
||||
if (other.y() <= bottom())
|
||||
return { { other.x(), bottom() + 1 }, { other.width(), other.height() - (bottom() - other.y()) } };
|
||||
else
|
||||
return other;
|
||||
}
|
||||
break;
|
||||
}
|
||||
return {};
|
||||
}
|
||||
|
||||
[[nodiscard]] bool is_adjacent(Rect<T> const& other) const
|
||||
{
|
||||
if (is_empty() || other.is_empty())
|
||||
return false;
|
||||
if (intersects(other))
|
||||
return false;
|
||||
if (other.x() + other.width() == x() || other.x() == x() + width())
|
||||
return max(top(), other.top()) <= min(bottom(), other.bottom());
|
||||
if (other.y() + other.height() == y() || other.y() == y() + height())
|
||||
return max(left(), other.left()) <= min(right(), other.right());
|
||||
return false;
|
||||
}
|
||||
|
||||
[[nodiscard]] static Rect<T> centered_at(Point<T> const& point, Size<T> const& size)
|
||||
{
|
||||
return { { point.x() - size.width() / 2, point.y() - size.height() / 2 }, size };
|
||||
}
|
||||
|
||||
[[nodiscard]] Rect<T> united(Rect<T> const&) const;
|
||||
|
||||
[[nodiscard]] Point<T> top_left() const { return { left(), top() }; }
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue