// 当分辨率发生变化时，重新设置各个LayerCanvas的参考点和分辨率，并重置偏移量
private void SetOriginAndResolution(double newResolution, Utility.Point2D originPoint)
{
_origin = originPoint;
foreach (Layer layer in Layers)
{
ResetTranslate();
layer.LayerCanvas.Resolution = newResolution;
layer.LayerCanvas.OriginX = originPoint.X;
layer.LayerCanvas.OriginY = originPoint.Y;
}
}
private void CalculateStartViewBounds(Size size)
{
if (this._cacheBounds != null && this._origin == null)
{
Utility.Rectangle2D bounds = this._cacheBounds;
double width = size.Width;
double height = size.Height;
double resWidth = bounds.Width / width;
double resHeight = bounds.Height / height;
_mapResolution = (resHeight > resWidth) ? resHeight : resWidth;
_origin = new Utility.Point2D(bounds.Center.X - width * 0.5 * _mapResolution, bounds.Center.Y + height * 0.5 * _mapResolution);
_cacheBounds = new Utility.Rectangle2D(this.ViewBounds);
SetOriginAndResolution(_mapResolution, new Utility.Point2D(_origin));
}
}