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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_;
double time_stamp_;
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();
void Update(const double time);
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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