public void UpdateRasterEnvelope(float rasterScale, int beginX, int beginY, int xSize, int ySize)
{
_rasterEnvelopeOfWnd.Location = new Point(beginX, beginY);
_rasterEnvelopeOfWnd.Width = xSize;
_rasterEnvelopeOfWnd.Height = ySize;
//
if (_wndExtandMultiple > 1)
{
float scale = _rasterEnvelopeOfWnd.Width / _wndWidth;
float extandWidth = (_wndExtandMultiple * _wndWidth - _wndWidth) / 2f;
float extandHeight = (_wndExtandMultiple * _wndHeight - _wndHeight) / 2f;
int extandHalfCols = (int)(extandWidth * scale);
int extandHalfRows = (int)(extandHeight * scale);
_rasterEnvelopeOfVirtualWnd.Location = new Point(beginX - extandHalfCols, beginY - extandHalfRows);
_rasterEnvelopeOfVirtualWnd.Width = _rasterEnvelopeOfWnd.Width + 2 * extandHalfCols;
_rasterEnvelopeOfVirtualWnd.Height = _rasterEnvelopeOfWnd.Height + 2 * extandHalfRows;
}
else//virtual window size = actual window size
{
_rasterEnvelopeOfVirtualWnd = _rasterEnvelopeOfWnd;
}
//计算当前显示级别
_currentLevel = _tileComputer.GetNearestLevel(rasterScale);
//
UpdateCachedTiles();
}
