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1 // Copyright 2016 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 ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_POINTS_H_ | |
6 #define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_POINTS_H_ | |
7 | |
8 #include <deque> | |
9 #include <memory> | |
10 #include <vector> | |
11 | |
12 #include "base/time/time.h" | |
13 #include "ui/gfx/geometry/point.h" | |
14 #include "ui/gfx/geometry/rect.h" | |
15 | |
16 namespace ash { | |
17 | |
18 // LaserPointerPoints is a helper class used for displaying the palette tool | |
19 // laser pointer. It keeps track of the points needed to render the laser | |
20 // pointer and its tail. | |
21 class LaserPointerPoints { | |
22 public: | |
23 // Struct to describe each point. | |
24 struct LaserPoint { | |
25 gfx::Point location; | |
26 base::Time creation_time; | |
27 }; | |
28 | |
29 // Constructor with a parameter to choose the fade out time off the points in | |
jdufault
2016/08/16 19:33:56
off => of
sammiequon
2016/08/16 23:18:54
Done.
| |
30 // the collection. | |
31 explicit LaserPointerPoints(base::TimeDelta life_duration); | |
32 ~LaserPointerPoints(); | |
33 | |
34 // Adds a point. Automatically clears points that are too old. | |
35 void AddPoint(const gfx::Point& point); | |
36 // Removes all points. | |
37 void Clear(); | |
38 // Gets the bounding box of the points. | |
39 gfx::Rect GetBoundingBox() const; | |
40 // Returns the oldest point in the collection. | |
41 LaserPoint GetOldest() const; | |
42 // Returns the newest point in the collection. | |
43 LaserPoint GetMostRecent() const; | |
44 // Returns the number of points in the collection. | |
45 int GetNumberOfPoints() const; | |
46 // Whether there are any points or not. | |
47 bool IsEmpty() const; | |
48 | |
49 // Expose the iterator so callers can work with the points. | |
50 std::deque<LaserPoint>::const_iterator PointsStart() const; | |
51 std::deque<LaserPoint>::const_iterator PointsEnd() const; | |
52 | |
53 private: | |
54 // Generates extra points in an attempt to make the tail look smoother. | |
55 void GenerateCurvePoints(const LaserPoint& new_point, | |
56 std::vector<LaserPoint>& generated_points); | |
57 // Computes the new cumulative bounding box of the points, after a new point | |
58 // |point| is added. | |
59 void CalculateBounds(const gfx::Point& point); | |
60 void ClearOldPoints(); | |
61 | |
62 base::TimeDelta life_duration_; | |
63 gfx::Rect bounds_; | |
64 // The collection of points. | |
65 std::deque<LaserPoint> points_; | |
66 | |
67 DISALLOW_COPY_AND_ASSIGN(LaserPointerPoints); | |
68 }; | |
69 | |
70 } // namespace ash | |
71 | |
72 #endif // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_TOOLS_LASER_POINTER_POINTS_H_ | |
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