1 #ifndef __DALI_CAMERA_ACTOR_H__
2 #define __DALI_CAMERA_ACTOR_H__
5 * Copyright (c) 2018 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
21 #include <dali/public-api/actors/actor.h>
26 * @addtogroup dali_core_actors
30 namespace Internal DALI_INTERNAL
36 * @brief Enumeration for camera.
42 * @brief Enumeration for type determination of how camera operates.
47 FREE_LOOK, ///< Camera orientation is taken from CameraActor @SINCE_1_0.0
48 LOOK_AT_TARGET, ///< Camera is oriented to always look at a target @SINCE_1_0.0
52 * @brief Enumeration for projection modes.
57 PERSPECTIVE_PROJECTION, ///< Distance causes foreshortening; objects further from the camera appear smaller @SINCE_1_0.0
58 ORTHOGRAPHIC_PROJECTION, ///< Relative distance from the camera does not affect the size of objects @SINCE_1_0.0
64 * @brief CameraActor controls a camera.
66 * Allows the developer to use actor semantics to control a camera.
68 * DALi has a concept of a camera to display its virtual 3D world to a 2D screen.
69 * There are 2 ways of using the camera in DALi:
71 * - For 2D applications, you do not need to care about the camera at all. The default camera is already best suited for 2D applications
72 * (configured to have the origin of the coordinate system at the top-left corner of the screen, and unit 1 as 1 pixel of the screen).
73 * This is a typical way.
75 * - For 3D applications, you can change the view by manipulating the camera. You can translate or rotate the camera in this case.
76 * Note that the top-left corner of the screen and unit 1 no longer are (0,0,0) and 1 pixel after manipulating the camera.
78 * There are two types of camera actor, FREE_LOOK and LOOK_AT_TARGET. By default,
79 * the camera actor will be FREE_LOOK.
81 * - A FREE_LOOK camera uses actor's orientation to control where the camera is looking.
82 * If no additional rotations are specified, the camera looks in the negative Z direction.
84 * - For LOOK_AT_TARGET, the actor's orientation is ignored, instead the camera looks at TARGET_POSITION
85 * in world coordinates.
89 class DALI_CORE_API CameraActor : public Actor
94 * @brief Enumeration for the instance of properties belonging to the CameraActor class.
96 * Properties additional to Actor.
102 * @brief Enumeration for the instance of properties belonging to the CameraActor class.
104 * Properties additional to Actor.
109 TYPE = DEFAULT_DERIVED_ACTOR_PROPERTY_START_INDEX, ///< name "type", type std::string @SINCE_1_0.0
110 PROJECTION_MODE, ///< name "projectionMode", type std::string @SINCE_1_0.0
111 FIELD_OF_VIEW, ///< name "fieldOfView", type float @SINCE_1_0.0
112 ASPECT_RATIO, ///< name "aspectRatio", type float @SINCE_1_0.0
113 NEAR_PLANE_DISTANCE, ///< name "nearPlaneDistance", type float @SINCE_1_0.0
114 FAR_PLANE_DISTANCE, ///< name "farPlaneDistance", type float @SINCE_1_0.0
115 LEFT_PLANE_DISTANCE, ///< name "leftPlaneDistance", type float @SINCE_1_0.0
116 RIGHT_PLANE_DISTANCE, ///< name "rightPlaneDistance", type float @SINCE_1_0.0
117 TOP_PLANE_DISTANCE, ///< name "topPlaneDistance", type float @SINCE_1_0.0
118 BOTTOM_PLANE_DISTANCE, ///< name "bottomPlaneDistance", type float @SINCE_1_0.0
119 TARGET_POSITION, ///< name "targetPosition", type Vector3 @SINCE_1_0.0
120 PROJECTION_MATRIX, ///< name "projectionMatrix", type Matrix @SINCE_1_0.0
121 VIEW_MATRIX, ///< name "viewMatrix", type Matrix @SINCE_1_0.0
122 INVERT_Y_AXIS, ///< name "invertYAxis", type bool @SINCE_1_0.0
127 * @brief Creates an uninitialized CameraActor handle.
129 * Initialize it using CameraActor::New().
130 * Calling member functions with an uninitialized CameraActor handle is not allowed.
136 * @brief Creates a CameraActor object.
138 * @note No default camera perspective projection is set by this method. @see SetPerspectiveProjection().
141 * @return The newly created camera actor
143 static CameraActor New();
146 * @brief Creates a CameraActor object.
148 * Sets the default camera perspective projection for the given canvas size. @see SetPerspectiveProjection().
151 * @param[in] size The canvas size
152 * @return The newly created camera actor
154 static CameraActor New( const Size& size );
157 * @brief Downcasts a handle to CameraActor handle.
159 * If handle points to a CameraActor, the downcast produces valid handle.
160 * If not, the returned handle is left uninitialized.
162 * @param[in] handle to An object
163 * @return Handle to a CameraActor or an uninitialized handle
165 static CameraActor DownCast( BaseHandle handle );
170 * This is non-virtual, since derived Handle types must not contain data or virtual methods.
176 * @brief Copy constructor.
179 * @param[in] copy The actor to copy
181 CameraActor(const CameraActor& copy);
184 * @brief Assignment operator.
187 * @param[in] rhs The actor to copy
188 * @return A reference to this
190 CameraActor& operator=(const CameraActor& rhs);
193 * @brief Sets the camera type.
194 * The default type is Dali::Camera::FREE_LOOK
196 * @param[in] type The camera type
198 void SetType( Dali::Camera::Type type );
201 * @brief Gets the type of the camera.
204 * @return The type of camera
206 Dali::Camera::Type GetType() const;
209 * @brief Sets the projection mode.
212 * @param[in] mode One of PERSPECTIVE_PROJECTION or ORTHOGRAPHIC_PROJECTION
214 void SetProjectionMode( Dali::Camera::ProjectionMode mode );
217 * @brief Gets the projection mode.
220 * @return One of PERSPECTIVE_PROJECTION or ORTHOGRAPHIC_PROJECTION
222 Dali::Camera::ProjectionMode GetProjectionMode() const;
225 * @brief Sets the field of view.
228 * @param[in] fieldOfView The field of view in radians
230 void SetFieldOfView( float fieldOfView );
233 * @brief Gets the field of view in Radians.
235 * The default field of view is 45 degrees.
237 * @return The field of view in radians
239 float GetFieldOfView( );
242 * @brief Sets the aspect ratio.
245 * @param[in] aspectRatio The aspect ratio
247 void SetAspectRatio( float aspectRatio );
250 * @brief Gets the aspect ratio of the camera.
252 * The default aspect ratio is 4.0f/3.0f.
254 * @return The aspect ratio
256 float GetAspectRatio( );
259 * @brief Sets the near clipping plane distance.
262 * @param[in] nearClippingPlane Distance of the near clipping plane
264 void SetNearClippingPlane( float nearClippingPlane );
267 * @brief Gets the near clipping plane distance.
269 * The default near clipping plane is 800.0f, to match the default screen height.
270 * Reduce this value to see objects closer to the camera.
272 * @return The near clipping plane value
274 float GetNearClippingPlane( );
277 * @brief Sets the far clipping plane distance.
280 * @param[in] farClippingPlane Distance of the far clipping plane
282 void SetFarClippingPlane( float farClippingPlane );
285 * @brief Gets the far clipping plane distance.
287 * The default value is the default near clipping plane + (0xFFFF>>4).
289 * @return The far clipping plane value
291 float GetFarClippingPlane( );
294 * @brief Sets the target position of the camera.
297 * @param[in] targetPosition The position of the target to look at
298 * @pre Camera type is LOOK_AT_TARGET.
300 void SetTargetPosition( const Vector3& targetPosition );
303 * @brief Gets the Camera Target position.
305 * The default target position is Vector3::ZERO.
307 * @return The target position of the camera
308 * @pre Camera type is LOOK_AT_TARGET.
310 Vector3 GetTargetPosition() const;
313 * @brief Requests for an inversion on the Y axis on the projection calculation.
315 * The default value is not inverted.
317 * @param[in] invertYAxis True if the Y axis should be inverted
319 void SetInvertYAxis(bool invertYAxis);
322 * @brief Gets whether the Y axis is inverted.
325 * @return @c True if the Y axis is inverted, @c false otherwise
327 bool GetInvertYAxis();
330 * @brief Sets the default camera perspective projection for the given canvas size.
332 * Sets the near and far clipping planes, the field of view, the aspect ratio,
333 * and the Z position of the actor based on the canvas size so that 1 unit in
334 * XY (z=0) plane is 1 pixel on screen.
337 * @param[in] size The canvas size
338 * @pre The canvas size must be greater than zero.
341 void SetPerspectiveProjection( const Size& size );
344 * @brief Sets the camera projection to use orthographic projection.
346 * The XY plane is centered on the camera axis. The units in the X/Y
347 * plane directly equate to pixels on an equivalently sized
350 * The Z position of the actor, and the near and far clip planes of the
351 * bounding box match those that would be created by using
352 * SetPerspectiveProjection with the same size.
355 * @param[in] size Size of XY plane (normal to camera axis)
357 void SetOrthographicProjection( const Size& size );
360 * @brief Sets the camera projection to use orthographic projection with the given clip planes.
362 * This does not change the Z value of the camera actor.
365 * @param[in] left Distance to left clip plane (normal to camera axis)
366 * @param[in] right Distance to right clip plane (normal to camera axis)
367 * @param[in] top Distance to top clip plane (normal to camera axis)
368 * @param[in] bottom Distance to bottom clip plane (normal to camera axis)
369 * @param[in] near Distance to the near clip plane (along camera axis)
370 * @param[in] far Distance to the far clip plane (along camera axis)
372 void SetOrthographicProjection( float left, float right, float top, float bottom, float near, float far );
374 public: // Not intended for use by Application developers
377 * @brief This constructor is used by CameraActor::New() methods.
380 * @param[in] actor A pointer to a newly allocated Dali resource
382 explicit DALI_INTERNAL CameraActor(Internal::CameraActor* actor);
391 #endif // __DALI_CAMERA_ACTOR_H__