private void UserControl_Loaded(object sender, RoutedEventArgs e)
{
if (uc == null)
{
uc = new Earth();
uc.config.isShowDebugInfo = true; //在屏下方显示相机信息
uc.config.isDynShow = true; //根据相机视界动态显示图形对象，动态载入时，此属性必须为true
uc.config.isDynLoad = true;
grdMain.Children.Add(uc);
uc.earthManager.earthpara.ArrowSpan = 1.5f; //控制潮流箭头密度
loadModel();
uc.camera.XRotationScale = 0.8;
uc.MouseMove += new MouseEventHandler(uc_MouseMove); //tooltip示例
tooltiptimer.Interval = TimeSpan.FromMilliseconds(200);
tooltiptimer.Tick += new EventHandler(tooltiptimer_Tick);
//动态载入
bworker.DoWork += new DoWorkEventHandler(bworker_DoWork);
bworker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bworker_RunWorkerCompleted);
bworker.WorkerSupportsCancellation = true;
uc.VisualRangeChanged += new EventHandler(uc_VisualRangeChanged);
Camera.ViewRange vr = uc.camera.curCamearaViewRange;
oldminjd = vr.farLongitudeStart;
oldmaxjd = vr.farLongitudeEnd;
oldminwd = vr.latitudeStart;
oldmaxwd = vr.latitudeEnd;
olddictance = uc.camera.curCameraDistanceToGround;
}
}
void uc_VisualRangeChanged(object sender, EventArgs e)
{
//判断是否重载对象
Camera.ViewRange vr = uc.camera.curCamearaViewRange;
bool isReload = false;
if (Math.Abs(uc.camera.curCameraDistanceToGround - olddictance) / olddictance > 0.3) //当离地距离变化超过30%时，重载对象
{
isReload = true;
}
else
{
float cjd = (vr.farLongitudeStart + vr.farLongitudeEnd) / 2;
float cwd = (vr.latitudeStart + vr.latitudeEnd) / 2;
if (
(cjd < oldminjd + 0.25 * (oldmaxjd - oldminjd)) ||
(cjd > oldminjd + 0.75 * (oldmaxjd - oldminjd)) ||
(cwd < oldminwd + 0.25 * (oldmaxwd - oldminwd)) ||
(cwd > oldminwd + 0.75 * (oldmaxwd - oldminwd))
) //当中心点偏移超过范围的50%时，重载对象
{
isReload = true;
}
}
if (isReload)
{
//重置载入范围
float jdlen = vr.farLongitudeEnd - vr.farLongitudeStart;
float wdlen = vr.latitudeEnd - vr.latitudeStart;
oldminjd = vr.farLongitudeStart - 3 * jdlen;
oldmaxjd = vr.farLongitudeEnd + 3 * jdlen;
oldminwd = vr.latitudeStart - 3 * wdlen;
oldmaxwd = vr.latitudeEnd + 3 * wdlen;
olddictance = uc.camera.curCameraDistanceToGround * 0.8f;
//后台方式重载
//while (bworker.IsBusy)
// bworker.CancelAsync();
//bworker.RunWorkerAsync();
if (!bworker.IsBusy)
{
bworker.RunWorkerAsync();
}
}
else //若不用重载对象，也需重绘对象
{
if (!bworker.IsBusy)
{
uc.UpdateModel();
}
}
}
