灵活Camera类

class Camera { public: enum CameraType { LANDOBJECT, AIRCRAFT }; Camera(); Camera(CameraType cameraType); ~Camera(); void strafe(float units); //left/right; void fly(float units); //up/down; void walk(float units); //forward/backward; void pitch(float angle); //rotate on right vector; void yaw(float angle); //rotate on up vector; void roll(float angle); //rotate on look vector; void getViewMatrix(D3DXMATRIX* V); void setCameraType(CameraType cameraType); void getPosition(D3DXVECTOR3* pos); void setPosition(D3DXVECTOR3* pos); void getRight(D3DXVECTOR3* right); void getUp(D3DXVECTOR3* up); void getLook(D3DXVECTOR3* look); private: CameraType _cameraType; D3DXVECTOR3 _right; D3DXVECTOR3 _up; D3DXVECTOR3 _look; D3DXVECTOR3 _pos; }; void Camera::getViewMatrix(D3DXMATRIX* V) { //Keep camera's axes orthogonal to eachother D3DXVec3Normalize(&_look, &_look); D3DXVec3Cross(&_up, &_look, &_right); D3DXVec3Normalize(&_up, &_up); D3DXVec3Cross(&_right, &_up, &_look); D3DXVec3Normalize(&_right, &_right); //Build the view matrix: float x = -D3DXVec3Dot(&_right, &_pos); float y = -D3DXVec3Dot(&_up, &_pos); float z = -D3DXVec3Dot(&_look, &_pos); (*V)(0, 0) = _right.x; (*V)(0, 1) = _up.x; (*V)(0, 2) = _look.x; (*V)(0, 3) = 0.0f; (*V)(1, 0) = _right.y; (*V)(1, 1) = _up.y; (*V)(1, 2) = _look.y; (*V)(1, 3) = 0.0f; (*V)(2, 0) = _right.z; (*V)(2, 1) = _up.z; (*V)(2, 2) = _look.z; (*V)(2, 3) = 0.0f; (*V)(3, 0) = x; (*V)(3, 1) = y; (*V)(3, 2) = z; (*V)(3, 3) = 1.0f; } void Camera::pitch(&T, &_right, angle) { D3DXMATRIX T; D3DXMatrixRotationAxis(&T, &_right, angle); //rotate _up and _look around _right vector D3DXVec3TransformCoord(&_up, &_up, &T); D3DXVec3TransformCoord(&_look, &_look, &T); } void Camera::yaw(float angle) { D3DXMATRIX T; //rotate around world y(0, 1, 0) always for land object if(_cameraType == LANDOBJECT) D3DXMatrixRotationY(&T, angle); //rotate around own up vector for aircraft if(_cameraType == AIRCRAFT) D3DXMatrixRotationAxis(&T, &_up, angle); //rotate _right and _look around _up or y-axis D3DXVec3TransformCoord(&_right, &_right, &T); D3DXVec3TrandformCoord(&_look, &_look, &T); } void Camera::roll(float angle) { //only roll for aircraft type if(_cameraType == AIRCRAFT) { D3DXMATRIX T; D3DXMatrixRotationAxis(&T, &_look, angle); //rotate _up and _right around _look vector D3DXVec3TransformCoord(&_right, &_right, &T); D3DXVec3TransformCoord(&_look, &_look, &T); } } void Camera::walk(float units) { //move only on xz plane for land object if(_cameraType == LANDOBJECT) _pos += D3DXCECTOR3(_look.x, 0.0f, _look.z) * units; if(_cameraType == AIRCRAFT) _pos += _look * units; } void Camera::strafe(float units) { //move only on xz plane for land object if(_cameraType == LANDOBJECT) _pos += D3DXVECTOR3(_right.x, 0.0f, _right.z) * units; if(_cameraType == AIRCRAFT) _pos += _right * units; } void Camera::fly(float units) { //move only on y-axis for land object if(_cameraType == LANDOBJECT) _pos.y += units; if(_cameraType == AIRCRAFE) _pos += _up * units; }