private async void LoadImageFile_OnClick(object sender, RoutedEventArgs e)
{
var filePicker = new FileOpenPicker();
filePicker.FileTypeFilter.Add(".jpg");
filePicker.FileTypeFilter.Add(".jpeg");
filePicker.FileTypeFilter.Add(".ppm");
var result = await filePicker.PickSingleFileAsync();
if (result != null)
{
_map.DeleteImage();
MapScrollViewer.ChangeView(0, 0, 1);
if (result.FileType.Equals(".ppm"))
{
var ppm = new PpmFile();
await ppm.ReadPpmFile(result);
_map.CreateImage(ppm);
}
else
{
_map.CreateImage(result);
}
}
}
private void FitContent(int width, int height)
{
var currentZoom = MapScrollViewer.ZoomFactor;
double scaleX = MapScrollViewer.ActualWidth / width;
double scaleY = MapScrollViewer.ActualHeight / height;
var newZoom = (float)(currentZoom * Math.Min(scaleX, scaleY));
newZoom = Math.Max(newZoom, MapScrollViewer.MinZoomFactor);
newZoom = Math.Min(newZoom, MapScrollViewer.MaxZoomFactor);
var currentPan = new Vector2((float)MapScrollViewer.HorizontalOffset,
(float)MapScrollViewer.VerticalOffset);
var centerOffset = new Vector2((float)MapScrollViewer.ViewportWidth,
(float)MapScrollViewer.ViewportHeight) / 2;
var newPan = ((currentPan + centerOffset) * newZoom / currentZoom) - centerOffset;
if (double.IsNaN(newPan.X) || double.IsNaN(newPan.Y) || double.IsNaN(newZoom))
{
return;
}
MapScrollViewer.ChangeView(newPan.X, newPan.Y, newZoom);
}
private void Pan(Point curContentMousePoint)
{
Vector2 dragOffset = new Vector2((float)curContentMousePoint.X - (float)_mouseStart.X,
(float)curContentMousePoint.Y - (float)_mouseStart.Y);
var dragOffsetX = MapScrollViewer.HorizontalOffset - dragOffset.X * MapController.Instance.Zoom;
var dragOffsetY = MapScrollViewer.VerticalOffset - dragOffset.Y * MapController.Instance.Zoom;
MapScrollViewer.ChangeView(dragOffsetX, dragOffsetY, null);
}
