1 // Copyright 2015 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_GFX_RANGE_RANGE_F_H_ 6 #define UI_GFX_RANGE_RANGE_F_H_ 7 8 #include <limits> 9 #include <ostream> 10 #include <string> 11 12 #include "ui/gfx/range/gfx_range_export.h" 13 #include "ui/gfx/range/range.h" 14 15 namespace gfx { 16 17 // A float version of Range. RangeF is made of a start and end position; when 18 // they are the same, the range is empty. Note that |start_| can be greater 19 // than |end_| to respect the directionality of the range. 20 class GFX_RANGE_EXPORT RangeF { 21 public: 22 // Creates an empty range {0,0}. 23 constexpr RangeF() : RangeF(0.f) {} 24 25 // Initializes the range with a start and end. 26 constexpr RangeF(float start, float end) : start_(start), end_(end) {} 27 28 // Initializes the range with the same start and end positions. 29 constexpr explicit RangeF(float position) : RangeF(position, position) {} 30 31 // Returns a range that is invalid, which is {float_max,float_max}. 32 static constexpr RangeF InvalidRange() { 33 return RangeF(std::numeric_limits<float>::max()); 34 } 35 36 // Checks if the range is valid through comparison to InvalidRange(). 37 constexpr bool IsValid() const { return *this != InvalidRange(); } 38 39 // Getters and setters. 40 constexpr float start() const { return start_; } 41 void set_start(float start) { start_ = start; } 42 43 constexpr float end() const { return end_; } 44 void set_end(float end) { end_ = end; } 45 46 // Returns the absolute value of the length. 47 constexpr float length() const { return GetMax() - GetMin(); } 48 49 constexpr bool is_reversed() const { return start() > end(); } 50 constexpr bool is_empty() const { return start() == end(); } 51 52 // Returns the minimum and maximum values. 53 constexpr float GetMin() const { return start() < end() ? start() : end(); } 54 constexpr float GetMax() const { return start() > end() ? start() : end(); } 55 56 constexpr bool operator==(const RangeF& other) const { 57 return start() == other.start() && end() == other.end(); 58 } 59 constexpr bool operator!=(const RangeF& other) const { 60 return !(*this == other); 61 } 62 constexpr bool EqualsIgnoringDirection(const RangeF& other) const { 63 return GetMin() == other.GetMin() && GetMax() == other.GetMax(); 64 } 65 66 // Returns true if this range intersects the specified |range|. 67 constexpr bool Intersects(const RangeF& range) const { 68 return IsValid() && range.IsValid() && 69 !(range.GetMax() < GetMin() || range.GetMin() >= GetMax()); 70 } 71 72 // Returns true if this range contains the specified |range|. 73 constexpr bool Contains(const RangeF& range) const { 74 return IsValid() && range.IsValid() && GetMin() <= range.GetMin() && 75 range.GetMax() <= GetMax(); 76 } 77 78 // Computes the intersection of this range with the given |range|. 79 // If they don't intersect, it returns an InvalidRange(). 80 // The returned range is always empty or forward (never reversed). 81 RangeF Intersect(const RangeF& range) const; 82 RangeF Intersect(const Range& range) const; 83 84 // Floor/Ceil/Round the start and end values of the given RangeF. 85 Range Floor() const; 86 Range Ceil() const; 87 Range Round() const; 88 89 std::string ToString() const; 90 91 private: 92 float start_; 93 float end_; 94 }; 95 96 GFX_RANGE_EXPORT std::ostream& operator<<(std::ostream& os, 97 const RangeF& range); 98 99 } // namespace gfx 100 101 #endif // UI_GFX_RANGE_RANGE_F_H_ 102
