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127 lines
3.2 KiB
127 lines
3.2 KiB
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef UI_GFX_GEOMETRY_POINT_F_H_
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#define UI_GFX_GEOMETRY_POINT_F_H_
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#include <iosfwd>
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#include <string>
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#include <tuple>
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#include "ui/gfx/geometry/point.h"
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#include "ui/gfx/geometry/vector2d_f.h"
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#include "ui/gfx/gfx_export.h"
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namespace gfx {
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// A floating version of gfx::Point.
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class GFX_EXPORT PointF {
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public:
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constexpr PointF() : x_(0.f), y_(0.f) {}
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constexpr PointF(float x, float y) : x_(x), y_(y) {}
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constexpr explicit PointF(const Point& p)
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: PointF(static_cast<float>(p.x()), static_cast<float>(p.y())) {}
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constexpr float x() const { return x_; }
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constexpr float y() const { return y_; }
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void set_x(float x) { x_ = x; }
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void set_y(float y) { y_ = y; }
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void SetPoint(float x, float y) {
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x_ = x;
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y_ = y;
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}
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void Offset(float delta_x, float delta_y) {
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x_ += delta_x;
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y_ += delta_y;
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}
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void operator+=(const Vector2dF& vector) {
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x_ += vector.x();
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y_ += vector.y();
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}
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void operator-=(const Vector2dF& vector) {
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x_ -= vector.x();
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y_ -= vector.y();
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}
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void SetToMin(const PointF& other);
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void SetToMax(const PointF& other);
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bool IsOrigin() const { return x_ == 0 && y_ == 0; }
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Vector2dF OffsetFromOrigin() const { return Vector2dF(x_, y_); }
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// A point is less than another point if its y-value is closer
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// to the origin. If the y-values are the same, then point with
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// the x-value closer to the origin is considered less than the
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// other.
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// This comparison is required to use PointF in sets, or sorted
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// vectors.
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bool operator<(const PointF& rhs) const {
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return std::tie(y_, x_) < std::tie(rhs.y_, rhs.x_);
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}
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void Scale(float scale) {
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Scale(scale, scale);
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}
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void Scale(float x_scale, float y_scale) {
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SetPoint(x() * x_scale, y() * y_scale);
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}
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// Returns a string representation of point.
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std::string ToString() const;
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private:
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float x_;
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float y_;
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};
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inline bool operator==(const PointF& lhs, const PointF& rhs) {
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return lhs.x() == rhs.x() && lhs.y() == rhs.y();
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}
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inline bool operator!=(const PointF& lhs, const PointF& rhs) {
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return !(lhs == rhs);
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}
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inline PointF operator+(const PointF& lhs, const Vector2dF& rhs) {
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PointF result(lhs);
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result += rhs;
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return result;
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}
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inline PointF operator-(const PointF& lhs, const Vector2dF& rhs) {
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PointF result(lhs);
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result -= rhs;
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return result;
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}
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inline Vector2dF operator-(const PointF& lhs, const PointF& rhs) {
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return Vector2dF(lhs.x() - rhs.x(), lhs.y() - rhs.y());
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}
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inline PointF PointAtOffsetFromOrigin(const Vector2dF& offset_from_origin) {
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return PointF(offset_from_origin.x(), offset_from_origin.y());
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}
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GFX_EXPORT PointF ScalePoint(const PointF& p, float x_scale, float y_scale);
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inline PointF ScalePoint(const PointF& p, float scale) {
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return ScalePoint(p, scale, scale);
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}
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// This is declared here for use in gtest-based unit tests but is defined in
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// the //ui/gfx:test_support target. Depend on that to use this in your unit
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// test. This should not be used in production code - call ToString() instead.
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void PrintTo(const PointF& point, ::std::ostream* os);
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} // namespace gfx
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#endif // UI_GFX_GEOMETRY_POINT_F_H_
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