OpenShot Library | libopenshot  0.2.5
Crop.h
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1 /**
2  * @file
3  * @brief Header file for Crop effect class
4  * @author Jonathan Thomas <jonathan@openshot.org>
5  *
6  * @ref License
7  */
8 
9 /* LICENSE
10  *
11  * Copyright (c) 2008-2019 OpenShot Studios, LLC
12  * <http://www.openshotstudios.com/>. This file is part of
13  * OpenShot Library (libopenshot), an open-source project dedicated to
14  * delivering high quality video editing and animation solutions to the
15  * world. For more information visit <http://www.openshot.org/>.
16  *
17  * OpenShot Library (libopenshot) is free software: you can redistribute it
18  * and/or modify it under the terms of the GNU Lesser General Public License
19  * as published by the Free Software Foundation, either version 3 of the
20  * License, or (at your option) any later version.
21  *
22  * OpenShot Library (libopenshot) is distributed in the hope that it will be
23  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25  * GNU Lesser General Public License for more details.
26  *
27  * You should have received a copy of the GNU Lesser General Public License
28  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
29  */
30 
31 #ifndef OPENSHOT_CROP_EFFECT_H
32 #define OPENSHOT_CROP_EFFECT_H
33 
34 #include "../EffectBase.h"
35 
36 #include <cmath>
37 #include <stdio.h>
38 #include <memory>
39 #include "../Color.h"
40 #include "../Json.h"
41 #include "../KeyFrame.h"
42 
43 
44 namespace openshot
45 {
46 
47  /**
48  * @brief This class crops a frame image (from any side), and can be animated with
49  * openshot::Keyframe curves over time.
50  *
51  * Cropping images can be useful when wanting to remove a border around an image or video, and animating
52  * the crop can create some very interesting effects.
53  */
54  class Crop : public EffectBase
55  {
56  private:
57  /// Init effect settings
58  void init_effect_details();
59 
60 
61  public:
62  Color color; ///< Color of bars
63  Keyframe left; ///< Size of left bar
64  Keyframe top; ///< Size of top bar
65  Keyframe right; ///< Size of right bar
66  Keyframe bottom; ///< Size of bottom bar
67 
68  /// Blank constructor, useful when using Json to load the effect properties
69  Crop();
70 
71  /// Default constructor, which takes 4 curves. These curves animate the crop over time.
72  ///
73  /// @param left The curve to adjust the left bar size (between 0 and 1)
74  /// @param top The curve to adjust the top bar size (between 0 and 1)
75  /// @param right The curve to adjust the right bar size (between 0 and 1)
76  /// @param bottom The curve to adjust the bottom bar size (between 0 and 1)
78 
79  /// @brief This method is required for all derived classes of EffectBase, and returns a
80  /// modified openshot::Frame object
81  ///
82  /// The frame object is passed into this method, and a frame_number is passed in which
83  /// tells the effect which settings to use from its keyframes (starting at 1).
84  ///
85  /// @returns The modified openshot::Frame object
86  /// @param frame The frame object that needs the effect applied to it
87  /// @param frame_number The frame number (starting at 1) of the effect on the timeline.
88  std::shared_ptr<Frame> GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number);
89 
90  /// Get and Set JSON methods
91  std::string Json() const override; ///< Generate JSON string of this object
92  void SetJson(const std::string value); ///< Load JSON string into this object
93  Json::Value JsonValue() const override; ///< Generate Json::Value for this object
94  void SetJsonValue(const Json::Value root); ///< Load Json::Value into this object
95 
96  /// Get all properties for a specific frame (perfect for a UI to display the current state
97  /// of all properties at any time)
98  std::string PropertiesJSON(int64_t requested_frame) const override;
99  };
100 
101 }
102 
103 #endif
openshot::Crop::SetJson
void SetJson(const std::string value)
Load JSON string into this object.
Definition: Crop.cpp:139
openshot::Crop::PropertiesJSON
std::string PropertiesJSON(int64_t requested_frame) const override
Definition: Crop.cpp:173
openshot::Crop::GetFrame
std::shared_ptr< Frame > GetFrame(std::shared_ptr< Frame > frame, int64_t frame_number)
This method is required for all derived classes of EffectBase, and returns a modified openshot::Frame...
Definition: Crop.cpp:65
openshot::EffectBase
This abstract class is the base class, used by all effects in libopenshot.
Definition: EffectBase.h:66
openshot::Crop::SetJsonValue
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Definition: Crop.cpp:156
openshot::Crop::right
Keyframe right
Size of right bar.
Definition: Crop.h:65
openshot
This namespace is the default namespace for all code in the openshot library.
Definition: AudioBufferSource.h:38
openshot::Crop::bottom
Keyframe bottom
Size of bottom bar.
Definition: Crop.h:66
openshot::Crop::left
Keyframe left
Size of left bar.
Definition: Crop.h:63
openshot::Color
This class represents a color (used on the timeline and clips)
Definition: Color.h:45
openshot::Crop::color
Color color
Color of bars.
Definition: Crop.h:62
openshot::Keyframe
A Keyframe is a collection of Point instances, which is used to vary a number or property over time.
Definition: KeyFrame.h:64
openshot::Crop::Json
std::string Json() const override
Get and Set JSON methods.
Definition: Crop.cpp:117
openshot::Crop
This class crops a frame image (from any side), and can be animated with openshot::Keyframe curves ov...
Definition: Crop.h:54
openshot::Crop::Crop
Crop()
Blank constructor, useful when using Json to load the effect properties.
Definition: Crop.cpp:36
openshot::Crop::JsonValue
Json::Value JsonValue() const override
Generate Json::Value for this object.
Definition: Crop.cpp:124
openshot::Crop::top
Keyframe top
Size of top bar.
Definition: Crop.h:64