look-camera.cpp
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/*
* Copyright (c) 2017 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "look-camera.h"
#include <dali/public-api/common/stage.h>
#include <dali/public-api/render-tasks/render-task-list.h>
#include <dali/public-api/render-tasks/render-task.h>
#include <dali/public-api/events/touch-data.h>
#include <dali/public-api/events/touch-event.h>
using namespace Dali;
namespace
{
// Input sensitivity, the larger value, the more sensitive input
// Default value has been chosen empirically
const float CAMERA_SENSITIVITY ( 90.0f );
// Vertical angle limit of the camera
const float CAMERA_VERTICAL_LIMIT ( 80.0f );
// Position where camera is instantiated by default
const Vector3 CAMERA_DEFAULT_POSITION ( 0.0f, 0.0f, 3.0f );
// Field-of-View in degrees
const float CAMERA_DEFAULT_FOV ( 60.0f );
// Near plane
const float CAMERA_DEFAULT_NEAR ( 0.1f );
// Far plane
const float CAMERA_DEFAULT_FAR ( 100.0f );
// Default forward vector
const Vector3 CAMERA_FORWARD ( 0.0f, 0.0f, 1.0f );
// Default up vector
const Vector3 CAMERA_UP ( Vector3::YAXIS );
}
LookCamera::LookCamera()
: mCameraYawPitch( 0.0f, 180.0f ),
mFovY( CAMERA_DEFAULT_FOV ),
mNear( CAMERA_DEFAULT_NEAR ),
mFar( CAMERA_DEFAULT_FAR ),
mCameraPosition( CAMERA_DEFAULT_POSITION )
{
}
LookCamera::~LookCamera()
{
mTimer.Stop();
mCameraActor.Remove( mInterceptorActor );
}
void LookCamera::Initialise( const Vector3& position, float fovY, float near, float far )
{
mFovY = fovY;
mNear = near;
mFar = far;
// Camera position is shadowed in order to avoid using.GetCurrentProperty< Vector3 >( Actor::Property::POSITION )
mCameraPosition = position;
// Initialise default camera
InitialiseDefaultCamera();
// Create input interceptor actor
CreateInterceptorActor();
// Start timer
mTimer = Timer::New( 16 );
mTimer.TickSignal().Connect( this, &LookCamera::OnTick );
mTimer.Start();
}
bool LookCamera::OnTick()
{
Vector2 stageSize = Stage::GetCurrent().GetSize();
// ---------------------------------------------------------------------
// update rotation
Vector2 tmp( mScreenLookDelta );
mScreenLookDelta = Vector2::ZERO;
float yaw = ( (tmp.y / stageSize.x ) * CAMERA_SENSITIVITY );
float pitch = ( (tmp.x / stageSize.y ) * CAMERA_SENSITIVITY );
mCameraYawPitch.x -= yaw;
mCameraYawPitch.y -= pitch;
if( abs( mCameraYawPitch.x ) > CAMERA_VERTICAL_LIMIT )
{
mCameraYawPitch.x = CAMERA_VERTICAL_LIMIT * ((mCameraYawPitch.x < 0) ? -1.0f : 1.0f );
}
Quaternion rotation;
Quaternion rotX( Degree( mCameraYawPitch.x), Vector3( 1.0f, 0.0f, 0.0f ) );
Quaternion rotY( Degree( mCameraYawPitch.y), Vector3( 0.0f, 1.0f, 0.0f ) );
rotation = ( rotY * rotX );
mCameraActor.SetProperty( Actor::Property::ORIENTATION, rotation );
return true;
}
void LookCamera::InitialiseDefaultCamera()
{
Stage stage = Stage::GetCurrent();
mCameraActor = stage.GetRenderTaskList().GetTask(0).GetCameraActor();
mCameraActor.SetProperty( Dali::Actor::Property::NAME, "LookCamera" );
mCameraActor.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
mCameraActor.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
mCameraActor.SetFieldOfView( Radian( Degree( mFovY ) ) );
// should be read from file
mCameraActor.SetNearClippingPlane( mNear );
mCameraActor.SetFarClippingPlane( mFar );
mCameraActor.SetProperty( Actor::Property::POSITION, mCameraPosition );
}
void LookCamera::CreateInterceptorActor()
{
Stage stage = Stage::GetCurrent();
mInterceptorActor = Actor::New();
mInterceptorActor.SetProperty( Dali::Actor::Property::NAME, "InputInterceptor" );
mInterceptorActor.SetProperty( Actor::Property::SIZE, Vector3( stage.GetSize().x, stage.GetSize().y, 1 ) );
mInterceptorActor.SetProperty( Actor::Property::POSITION, Vector3( 0.0, 0.0, 1.0 ) );
mInterceptorActor.SetProperty( Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER );
mInterceptorActor.SetProperty( Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER );
mCameraActor.Add( mInterceptorActor );
// Connect TouchSignal to interceptor actor
mInterceptorActor.TouchSignal().Connect( this, &LookCamera::OnTouch );
}
bool LookCamera::OnTouch( Actor actor, const TouchData& touch )
{
Stage stage = Stage::GetCurrent();
for( int i = 0; i < (int)touch.GetPointCount() && i < 3; ++i )
{
Vector2 position( touch.GetScreenPosition( i ) );
// touch started
if( touch.GetState( i ) == PointState::STARTED )
{
mOldTouchLookPosition = position;
}
else if( touch.GetState( i ) == PointState::FINISHED ||
touch.GetState( i ) == PointState::LEAVE ||
touch.GetState( i ) == PointState::INTERRUPTED
)
{
mScreenLookDelta = Vector2::ZERO;
mOldTouchLookPosition = Vector2::ZERO;
}
else // on motion
{
mScreenLookDelta.x += ( position.x - mOldTouchLookPosition.x );
mScreenLookDelta.y += ( position.y - mOldTouchLookPosition.y );
mOldTouchLookPosition = position;
}
}
return true;
}