| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_GFX_RANGE_RANGE_F_H_ |
| #define UI_GFX_RANGE_RANGE_F_H_ |
| |
| #include <limits> |
| #include <ostream> |
| #include <string> |
| |
| #include "ui/gfx/range/gfx_range_export.h" |
| #include "ui/gfx/range/range.h" |
| |
| namespace gfx { |
| |
| // A float version of Range. RangeF is made of a start and end position; when |
| // they are the same, the range is empty. Note that |start_| can be greater |
| // than |end_| to respect the directionality of the range. |
| class GFX_RANGE_EXPORT RangeF { |
| public: |
| // Creates an empty range {0,0}. |
| constexpr RangeF() : RangeF(0.f) {} |
| |
| // Initializes the range with a start and end. |
| constexpr RangeF(float start, float end) : start_(start), end_(end) {} |
| |
| // Initializes the range with the same start and end positions. |
| constexpr explicit RangeF(float position) : RangeF(position, position) {} |
| |
| // Returns a range that is invalid, which is {float_max,float_max}. |
| static constexpr RangeF InvalidRange() { |
| return RangeF(std::numeric_limits<float>::max()); |
| } |
| |
| // Checks if the range is valid through comparison to InvalidRange(). |
| constexpr bool IsValid() const { return *this != InvalidRange(); } |
| |
| // Getters and setters. |
| constexpr float start() const { return start_; } |
| void set_start(float start) { start_ = start; } |
| |
| constexpr float end() const { return end_; } |
| void set_end(float end) { end_ = end; } |
| |
| // Returns the absolute value of the length. |
| constexpr float length() const { return GetMax() - GetMin(); } |
| |
| constexpr bool is_reversed() const { return start() > end(); } |
| constexpr bool is_empty() const { return start() == end(); } |
| |
| // Returns the minimum and maximum values. |
| constexpr float GetMin() const { return start() < end() ? start() : end(); } |
| constexpr float GetMax() const { return start() > end() ? start() : end(); } |
| |
| constexpr bool operator==(const RangeF& other) const { |
| return start() == other.start() && end() == other.end(); |
| } |
| constexpr bool operator!=(const RangeF& other) const { |
| return !(*this == other); |
| } |
| constexpr bool EqualsIgnoringDirection(const RangeF& other) const { |
| return GetMin() == other.GetMin() && GetMax() == other.GetMax(); |
| } |
| |
| // Returns true if this range intersects the specified |range|. |
| constexpr bool Intersects(const RangeF& range) const { |
| return Intersect(range).IsValid(); |
| } |
| |
| // Returns true if this range is contained by the specified |range| or it is |
| // an empty range and ending the range |range|. (copied from gfx::Range) |
| constexpr bool IsBoundedBy(const RangeF& range) const { |
| return IsValid() && range.IsValid() && GetMin() >= range.GetMin() && |
| GetMax() <= range.GetMax(); |
| } |
| |
| // Returns true if this range contains the specified |range|. |
| constexpr bool Contains(const RangeF& range) const { |
| return range.IsBoundedBy(*this) && |
| // A non-empty range doesn't contain the range [max, max). |
| (range.GetMax() != GetMax() || range.is_empty() == is_empty()); |
| } |
| |
| // Computes the intersection of this range with the given |range|. |
| // If they don't intersect, it returns an InvalidRange(). |
| // The returned range is always empty or forward (never reversed). |
| constexpr RangeF Intersect(const RangeF& range) const { |
| const float min = std::max(GetMin(), range.GetMin()); |
| const float max = std::min(GetMax(), range.GetMax()); |
| |
| return (min < max || Contains(range) || range.Contains(*this)) |
| ? RangeF(min, max) |
| : InvalidRange(); |
| } |
| |
| RangeF Intersect(const Range& range) const; |
| |
| // Floor/Ceil/Round the start and end values of the given RangeF. |
| Range Floor() const; |
| Range Ceil() const; |
| Range Round() const; |
| |
| std::string ToString() const; |
| |
| private: |
| float start_; |
| float end_; |
| }; |
| |
| GFX_RANGE_EXPORT std::ostream& operator<<(std::ostream& os, |
| const RangeF& range); |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_RANGE_RANGE_F_H_ |