async void DispatchZoomMap()
{
//处理缩放请求
while (true)
{
var para = await _zoomRequests.Any(); //.FirstAsync();
if (_scaleData == 0)
{
_scaleData = _locator.Scale;
}
var zoomRate = getZoomRate();
var point = Mouse.GetPosition(_seaMapInfo.MapFrame);
var mousePoint = _locator.ScreenToMap(point.X, point.Y);
var oldScale = _locator.Scale;
_scaleData = MapBorderInfo.CorrectionScale(_scaleData / zoomRate);
var lon = _locator.Center.Lon;
var lat = _locator.Center.Lat;
if (true)
{
var rot = _scaleData / oldScale;
var dy = mousePoint.Lat - _locator.Center.Lat;
var dx = _locator.Center.Lon - mousePoint.Lon;
lat = lat - dy * (rot - 1);
lon = lon + dx * (rot - 1);
}
await _locator.Locate(_scaleData, lon, lat);
}
}
public static Task Offset(this ILocator locator, double dx, double dy)
{
var center = locator.MapToScreen(locator.Center.Lon, locator.Center.Lat);
center.Offset(-dx, -dy);
var newCenter = locator.ScreenToMap(center.X, center.Y);
return(locator.Locate(locator.Scale, newCenter));
}
public static Task SetAsCenter(this ILocator locator, Point point)
{
var mapPoint = locator.ScreenToMap(point.X, point.Y);
return(locator.SetAsCenter(mapPoint));
}