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/*
* Copyright 2013 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <vector>
#include <string>
#include <GLES2/gl2.h>
#include "JNIHelper.h"
#include "vecmath.h"
#include "interpolator.h"
namespace ndk_helper
{
/******************************************************************
* Camera control helper class with a tap gesture
* This class is mainly used for 3D space camera control in samples.
*
*/
class TapCamera
{
private:
//Trackball
Vec2 vec_ball_center_;
float ball_radius_;
Quaternion quat_ball_now_;
Quaternion quat_ball_down_;
Vec2 vec_ball_now_;
Vec2 vec_ball_down_;
Quaternion quat_ball_rot_;
bool dragging_;
bool pinching_;
//Pinch related info
Vec2 vec_pinch_start_;
Vec2 vec_pinch_start_center_;
float pinch_start_distance_SQ_;
//Camera shift
Vec3 vec_offset_;
Vec3 vec_offset_now_;
//Camera Rotation
float camera_rotation_;
float camera_rotation_start_;
float camera_rotation_now_;
//Momentum support
bool momentum_;
Vec2 vec_drag_delta_;
Vec2 vec_last_input_;
Vec3 vec_offset_last_;
Vec3 vec_offset_delta_;
float momemtum_steps_;
Vec2 vec_flip_;
float flip_z_;
Mat4 mat_rotation_;
Mat4 mat_transform_;
Vec3 vec_pinch_transform_factor_;
Vec3 PointOnSphere( Vec2& point );
void BallUpdate();
void InitParameters();
public:
TapCamera();
virtual ~TapCamera();
void BeginDrag( const Vec2& vec );
void EndDrag();
void Drag( const Vec2& vec );
void Update();
Mat4& GetRotationMatrix();
Mat4& GetTransformMatrix();
void BeginPinch( const Vec2& v1, const Vec2& v2 );
void EndPinch();
void Pinch( const Vec2& v1, const Vec2& v2 );
void SetFlip( const float x, const float y, const float z )
{
vec_flip_ = Vec2( x, y );
flip_z_ = z;
}
void SetPinchTransformFactor( const float x, const float y, const float z )
{
vec_pinch_transform_factor_ = Vec3( x, y, z );
}
void Reset( const bool bAnimate );
};
} //namespace ndkHelper
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