DirextX编程

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Visual C++

zfxCamera.cpp：源码内容

							#include "stdafx.h"
#include "zfxCamera.h"
CZFXCamera::CZFXCamera()
{
	m_x = m_y = m_z = 0;
	m_pitchAngle = 0;
	m_yawAngle = 0;
}
CZFXCamera::~CZFXCamera()
{
}
void CZFXCamera::SetPosX(float x)
{
	m_x = x;
}
void CZFXCamera::SetPosY(float y)
{
	m_y = y;
}
void CZFXCamera::SetPosZ(float z)
{
	m_z = z;
}
void CZFXCamera::GetLookVec(D3DXVECTOR3* lookAtVec)
{
	float cosPitch = cos(m_pitchAngle);
	float sinPitch = sin(m_pitchAngle);
	float cosYaw   = cos(m_yawAngle);
	float sinYaw   = sin(m_yawAngle);
	lookAtVec->x = cosPitch * sinYaw;
	lookAtVec->y = sinPitch;
	lookAtVec->z = cosPitch * cosYaw;
}
void CZFXCamera::GetViewMatrix(D3DXMATRIX* pMatView)
{
	/*  D3DXMatrixLookAtLH Function in SDK interpretation
	zaxis = normal(At - Eye)
	xaxis = normal(cross(Up, zaxis))
	yaxis = cross(zaxis, xaxis)
	xaxis.x           yaxis.x           zaxis.x          0
	xaxis.y           yaxis.y           zaxis.y          0
	xaxis.z           yaxis.z           zaxis.z          0
	-dot(xaxis, eye)  -dot(yaxis, eye)  -dot(zaxis, eye)  1
	*/
	D3DXVECTOR3 zAxis, up, xAxis, yAxis;
	float cosPitch = cos(m_pitchAngle);
	float sinPitch = sin(m_pitchAngle);
	float cosYaw   = cos(m_yawAngle);
	float sinYaw   = sin(m_yawAngle);
	// 构造zAxis,构造时已是单位向量
	zAxis.x = cosPitch * sinYaw;
	zAxis.y = sinPitch;
	zAxis.z = cosPitch * cosYaw;
	// 构造up,构造时已是单位向量
	up.x = -sinPitch * sinYaw;
	up.y = cosPitch;
	up.z = -sinPitch * cosYaw;
	// 构造xAxis和yAxis
	D3DXVec3Cross( &xAxis, &up, &zAxis );
	D3DXVec3Cross( &yAxis, &zAxis, &xAxis );
	// Build the view matrix:
	D3DXVECTOR3 pos( m_x, m_y, m_z );
	float x = -D3DXVec3Dot(&xAxis, &pos);
	float y = -D3DXVec3Dot(&yAxis, &pos);
	float z = -D3DXVec3Dot(&zAxis, &pos);
	(*pMatView)(0,0) = xAxis.x; (*pMatView)(0, 1) = yAxis.x; (*pMatView)(0, 2) = zAxis.x; (*pMatView)(0, 3) = 0.0f;
	(*pMatView)(1,0) = xAxis.y; (*pMatView)(1, 1) = yAxis.y; (*pMatView)(1, 2) = zAxis.y; (*pMatView)(1, 3) = 0.0f;
	(*pMatView)(2,0) = xAxis.z; (*pMatView)(2, 1) = yAxis.z; (*pMatView)(2, 2) = zAxis.z; (*pMatView)(2, 3) = 0.0f;
	(*pMatView)(3,0) = x;       (*pMatView)(3, 1) = y;       (*pMatView)(3, 2) = z;       (*pMatView)(3, 3) = 1.0f;
}
// +z代表前进方向，+x代表向右方向
void CZFXCamera::Walk(float x, float z)
{
	float cosPitch = cos(m_pitchAngle);
	float sinPitch = sin(m_pitchAngle);
	float cosYaw   = cos(m_yawAngle);
	float sinYaw   = sin(m_yawAngle);
	m_z += z * cosPitch * cosYaw - x * cosPitch * sinYaw;
	m_x += z * cosPitch * sinYaw + x * cosPitch * cosYaw;
	m_y += z * sinPitch;
}
void CZFXCamera::Pitch(float fAngle)
{
	m_pitchAngle += fAngle;
}
void CZFXCamera::Yaw(float fAngle)
{
	m_yawAngle += fAngle;
}

						