private void ComputeViewPort()
{
var pixelToEightsRatioX = _parcelSizeLong.GetAsEightSeconds() / CurrentScale.ParcelSize;
var pixelToEightsRatioY = _parcelSizeLat.GetAsEightSeconds() / CurrentScale.ParcelSize;
_viewportHeight = new GeoCord(pixelToEightsRatioY * _canvas.ActualHeight / 8);
_viewportWidth = new GeoCord(pixelToEightsRatioX * _canvas.ActualWidth / 8);
}
public void SetupTransform(GeoCord viewportCenterLong, GeoCord viewportCenterLat, GeoCord viewportWidth, GeoCord viewportHeight)
{
var pixelToEightsRatioX = _parcelWidth.GetAsEightSeconds() / _parcelScreenSize;
var pixelToEightsRatioY = _parcelHeight.GetAsEightSeconds() / _parcelScreenSize;
var offsetFromCenterX = viewportWidth.Divide(2) + _parcelX - viewportCenterLong;
var offsetFromCenterY = viewportHeight.Divide(2) - _parcelY + viewportCenterLat;
var offsetX = offsetFromCenterX.GetAsEightSeconds() / pixelToEightsRatioX;
var offsetY = offsetFromCenterY.GetAsEightSeconds() / pixelToEightsRatioY;
var transformGroup = new System.Windows.Media.TransformGroup();
transformGroup.Children.Add(new System.Windows.Media.ScaleTransform(1, -1));
transformGroup.Children.Add(new System.Windows.Media.TranslateTransform(offsetX, offsetY));
_image.RenderTransform = transformGroup;
}
