1 /* 2 * Copyright (c) 2024 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef CAMERA_H 17 #define CAMERA_H 18 19 #include "Algorithm.h" 20 #include "Matrix4x4.h" 21 #include "Vector3.h" 22 23 // 定义相机移动的几个可能选项。用作抽象，以远离特定于窗口系统的输入方法 24 enum CameraMovement { FORWARD, BACKWARD, LEFT, RIGHT }; 25 26 // Default camera values 27 const float YAW = -90.0f; 28 const float PITCH = 0.0f; 29 const float SPEED = 2.5f; 30 const float SENSITIVITY = 0.1f; 31 const float ZOOM = 45.0f; 32 33 // 一个抽象的相机类，用于处理输入并计算相应的欧拉角、矢量和矩阵，以便在OpenGL中使用 34 class Camera { 35 public: 36 // 相机属性值 37 Vector3 Position{0.0f, 0.0f, 0.0f}; 38 Vector3 Front{0.0f, 0.0f, -1.0f}; 39 Vector3 Up{0.0f, 1.0f, 0.0f}; 40 Vector3 Right{0.0f, 0.0f, 0.0f}; 41 Vector3 WorldUp{0.0f, 0.0f, 0.0f}; 42 // 欧拉角度 43 float Yaw = YAW; 44 float Pitch = PITCH; 45 // 相机选项 46 float MovementSpeed = SPEED; 47 float MouseSensitivity = SENSITIVITY; 48 float Zoom = ZOOM; 49 50 // 向量的构造函数 Camera(Vector3 position)51 Camera(Vector3 position) 52 { 53 Position = position; 54 WorldUp = Up; 55 updateCameraVectors(); 56 } 57 // 返回使用“欧拉角”和“注视矩阵”计算的视图矩阵 GetViewMatrix()58 Matrix4x4 GetViewMatrix() { return Algorithm::LookAt(Position, Vector3::Add(Position, Front), Up); } 59 60 private: 61 // 根据摄影机的（更新的）Euler角度计算前向量 updateCameraVectors()62 void updateCameraVectors() 63 { 64 // 计算新的Front矢量 65 Vector3 front = {0, 0, 0}; 66 front.SetDataX(cos(Algorithm::Radians(Yaw)) * cos(Algorithm::Radians(Pitch))); 67 front.SetDataY(Algorithm::Radians(Pitch)); 68 front.SetDataZ(Algorithm::Radians(Yaw) * cos(Algorithm::Radians(Pitch))); 69 Front = front.Normalize(front); 70 // 同时重新计算向右和向上矢量 71 // 对向量进行归一化，因为向上或向下看得越多，它们的长度就越接近0，这会导致移动速度变慢。 72 Right = Vector3::Normalize(Vector3::Cross(Front, WorldUp)); 73 Up = Vector3::Normalize(Vector3::Cross(Right, Front)); 74 } 75 }; 76 #endif