///<summary>根据planeviewbox和planecameraheight自动调整相机位置</summary>
void planeAdjustCamera()
{
//计算相机位置
System.Windows.Point pnt = new System.Windows.Point(planeViewBox.Width / 2, planeViewBox.Height / 2);
System.Windows.Point geopnt = geohelper.planeToGeo(pnt.ToString());
VECTOR3D vc = MapHelper.JWHToPoint(geopnt.Y, geopnt.X, Para.LineHeight, earthpara);
float tmp = 1.0f + planeCameraHeight / Para.Radius;
earth.camera = new Camera(new Vector3(vc.x, vc.y, vc.z) * tmp, new Vector3(0, 0, 0), Vector3.Up, earth);
}
///<summary>获取相机中心与地面的交点, crosspoint为交点, distance为相机与交点距离</summary>
public void getCrossGround(out VECTOR3D?crosspoint, out float?distance)
{
Vector3?vec3;
getCrossGround(out vec3, out distance);
if (vec3 == null)
{
crosspoint = null;
}
else
{
crosspoint = new VECTOR3D(((Vector3)vec3).X, ((Vector3)vec3).Y, ((Vector3)vec3).Z);
}
}
/// <summary>
/// 自动调整相机距离以显示指定范围
/// </summary>
public void adjustCameraRange(System.Windows.Rect rect)
{
double minjd, maxjd, minwd, maxwd;
minwd = rect.Left; maxwd = rect.Right; minjd = rect.Top; maxjd = rect.Bottom;
List <VECTOR3D> corners = new List <VECTOR3D>();
VECTOR3D lefttop, righttop, leftbottom, rightbottom, center;
System.Windows.Media.Media3D.Vector3D lt, rt, lb, rb;
lefttop = MapHelper.JWHToPoint(minjd, maxwd, 0, earth.earthManager.earthpara); corners.Add(lefttop); lt = Helpler.vecD3DToWpf(lefttop);
righttop = MapHelper.JWHToPoint(maxjd, maxwd, 0, earth.earthManager.earthpara); corners.Add(righttop); rt = Helpler.vecD3DToWpf(righttop);
leftbottom = MapHelper.JWHToPoint(minjd, minwd, 0, earth.earthManager.earthpara); corners.Add(leftbottom); lb = Helpler.vecD3DToWpf(leftbottom);
rightbottom = MapHelper.JWHToPoint(maxjd, minwd, 0, earth.earthManager.earthpara); corners.Add(rightbottom); rb = Helpler.vecD3DToWpf(rightbottom);
System.Windows.Media.Media3D.Vector3D cent = new System.Windows.Media.Media3D.Vector3D((corners.Max(p => p.x) + corners.Min(p => p.x)) / 2, (corners.Max(p => p.y) + corners.Min(p => p.y)) / 2, (corners.Max(p => p.z) + corners.Min(p => p.z)) / 2);
if (earth.earthManager.earthpara.SceneMode == ESceneMode.地球)
{
cent = cent * Para.Radius / cent.Length;
center = new VECTOR3D(cent.X, cent.Y, cent.Z);
}
else //zh注：还未验证
{
center = new VECTOR3D(cent.X, cent.Y, 0);
}
double width, height;
width = Math.Max((rt - lt).Length, (rb - lb).Length) * 1.5;
height = Math.Max((lb - lt).Length, (rb - rt).Length) * 1.5;
double distance;
if (width / height > earth.global.ScreenWidth / earth.global.ScreenHeight) //以宽度来计算
{
distance = width * earth.global.ScreenHeight / earth.global.ScreenWidth / 2 / Math.Atan(FieldOfView / 2);
}
else //以高度来计算
{
distance = height / 2 / Math.Atan(FieldOfView / 2);
}
aniLook(center);
adjustCameraDistance((float)distance);
}
internal static extern POINT TransformD3DToScreen(int ekey, VECTOR3D d3dpoint);
public static System.Windows.Media.Media3D.Vector3D vecD3DToWpf(VECTOR3D vec)
{
return(new System.Windows.Media.Media3D.Vector3D(vec.x, vec.y, vec.z));
}
///<summary>动画移动相机查看指定位置,按内部三维坐标, timerFactor: 速度系数, 为0则无动画直接刷新</summary>
public void aniLook(VECTOR3D vecLocation, double speedFactor = 1)
{
//计算当前与地面夹角
System.Windows.Media.Media3D.Vector3D v1, v2, v3, v4, v5;
Vector3 vec = new Vector3(vecLocation.x, vecLocation.y, vecLocation.z);
if (earth.earthManager.earthpara.SceneMode == ESceneMode.地球)
{
vec = vec / vec.Length() * Para.Radius; //换算到地表高度
}
//当前观察点
Vector3?crosspnt;
float? distance;
float height;
getCrossGround(out crosspnt, out distance);
if (crosspnt != null)
{
float dis = (float)distance;
Vector3 cp = (Vector3)crosspnt;
if (earth.earthManager.earthpara.SceneMode == ESceneMode.地球)
{
v1 = new System.Windows.Media.Media3D.Vector3D(cp.X, cp.Y, cp.Z);
v2 = new System.Windows.Media.Media3D.Vector3D(cameraUp.X, cameraUp.Y, cameraUp.Z);
v3 = System.Windows.Media.Media3D.Vector3D.CrossProduct(v1, v2);
v4 = System.Windows.Media.Media3D.Vector3D.CrossProduct(v3, v1);
v5 = new System.Windows.Media.Media3D.Vector3D(cameraDirection.X, cameraDirection.Y, cameraDirection.Z);
float angle = (float)System.Windows.Media.Media3D.Vector3D.AngleBetween(v5, v4);
height = (new Vector3(cameraPosition.X, cameraPosition.Y, cameraPosition.Z)).Length() - Para.Radius;
Vector3 dir = vec;
dir.Normalize();
Vector3 axis = Vector3.Cross(dir, cameraUp);
axis.Normalize();
Matrix matrix = Matrix.CreateFromAxisAngle(axis, -MathHelper.Pi * (90.0f - angle) / 180.0f);
dir = Vector3.Transform(dir, matrix);
dir.Normalize();
cameraLookat = vec;
cameraPosition = cameraLookat + dir * dis;
cameraDirection = cameraLookat - cameraPosition;
cameraDirection.Normalize();
}
else
{
Matrix matrix = Matrix.CreateTranslation(vecLocation.x - cp.X, vecLocation.y - cp.Y, 0);
cameraPosition = Vector3.Transform(cameraPosition, matrix);
height = cameraPosition.Z;
}
if (speedFactor == 0)
{
calCameraByDirection();
updateD3DCamera();
earth.global.isUpdate = true;
}
else
{
int time = (int)((cp - cameraLookat).Length() / height / speedFactor * 100); //时长，与高度反比，和速度系数反比
calCameraByDirection();
updateD3DCamera(true, time);
}
}
}
///<summary>返回场景中3D点在场景平面的坐标</summary>
public System.Windows.Point transformD3DToScreen(VECTOR3D point3d)
{
POINT p = D3DManager.TransformD3DToScreen(earth.earthkey, point3d);
return(new System.Windows.Point(p.x, p.y));
}
