private void CalculateVisibleExtents( Extent e, bool LogPrev,bool OnResize)
{
if(_Map == null) return;
if( LogPrev == true )
{
LogPrevExtent();
}
//�жϵ�ǰ����ķ�Χ�Ƿ���ڵ�ͼ�Ŀɼ���Χ
//������ڿɼ���Χ���������ɼ���Χ��С
e.Left = e.Left < m_MapMinx ? m_MapMinx : e.Left;
e.Right = e.Right > m_MapMaxx ? m_MapMaxx : e.Right;
e.Bottom = e.Bottom < m_MapMiny ? m_MapMiny : e.Bottom;
e.Top = e.Top > m_MapMaxy ? m_MapMaxy : e.Top;
//�жϴ���ķ�Χ�뵱ǰ����ʾ����Χ�����Ƿ�һ��
//�����һ�£��ķ�Χ
double viewWidth = m_viewWidth;
double viewHeight = m_viewHeight;
double geoxMin = e.Left>=e.Right?e.Right:e.Left;
double geoxMax = e.Left >= e.Right ? e.Left : e.Right;
double geoyMin = e.Bottom >= e.Top ? e.Top : e.Bottom;
double geoyMax = e.Bottom >= e.Top ? e.Bottom : e.Top;
double geoWidth = Math.Abs(geoxMax - geoxMin);
double geoHeight = Math.Abs(geoyMax - geoyMin);
if((viewWidth <=0)||(viewHeight <= 0)||(geoWidth <=0)||(geoHeight<=0))
{
m_Curextents = new Extent();
return;
}
double xAdjust = 0;
double yAdjust = 0;
if((viewWidth/viewHeight)>(geoWidth/geoHeight))
{
xAdjust = ((viewWidth/viewHeight)*geoHeight - geoWidth)/2;
}
else
{
yAdjust = (geoWidth*viewHeight/viewWidth - geoHeight)/2;
}
//drawmap��ʱ���ı�extent�ķ�Χ��
//��Ҫ�����ﻹԭ
_Map.extent.maxx = geoxMax + xAdjust;
_Map.extent.minx = geoxMin - xAdjust;
_Map.extent.miny = geoyMin - yAdjust;
_Map.extent.maxy = geoyMax + yAdjust;
if (OnExtentChanged != null)
OnExtentChanged(null, null);
//m_Curextents.left = geoxMin - xAdjust;
//m_Curextents.right = geoxMax + xAdjust;
//m_Curextents.top = geoyMin - yAdjust;
//m_Curextents.bottom = geoyMax + yAdjust;
}
public void zoomToExtents(double xMin, double xMax, double yMin, double yMax)
{
Extent inExtent = new Extent(xMin,xMax,yMin,yMax);
CalculateVisibleExtents(inExtent,true,true);
refreshMap(false);
}
/// <summary>
/// refresh the map,can reread the origin mapfile
/// </summary>
/// <param name="reload"></param>
public void refreshMap(bool reload)
{
if (_Map == null)
{
if (this.BackgroundImage != null)
this.BackgroundImage = null;
return;
}
if (reload)
{
if (_Map != null)
_Map.Dispose();
try
{
//_TempMapfilePath = CreateTempMapfile(_MapfilePath);
_Map = new mapObj(_TempMapfilePath);
_Map.setSize(m_viewWidth, m_viewHeight);
_Map.extent.minx = m_Curextents.Left;
_Map.extent.maxx = m_Curextents.Right;
_Map.extent.miny = m_Curextents.Bottom;
_Map.extent.maxy = m_Curextents.Top;
drawImg2Mapcontrol();
//fire the mapreplaced event
if (this.OnMapReplaced != null)
OnMapReplaced(null, new EventArgs());
}
catch (Exception ex)
{
if (ErrorOccured != null)
ErrorOccured(null, new MSErrorEventArgs(ex.Message));
closeMapfile();
}
}
else
{
try
{
_Map.setSize(m_viewWidth, m_viewHeight);
drawImg2Mapcontrol();
calculateNewScale();
m_Curextents = new Extent(_Map.extent.minx, _Map.extent.maxx, _Map.extent.miny, _Map.extent.maxy);
{
double geoWidth = Math.Abs(m_Curextents.Right - m_Curextents.Left);
double geoHeight = Math.Abs(m_Curextents.Top - m_Curextents.Bottom);
if (geoWidth == 0)
{
m_pixelPerProjectionX = 0;
m_inversePixelPerProjectionX = 0;
}
else
{
m_pixelPerProjectionX = m_viewWidth / geoWidth;
m_inversePixelPerProjectionX = 1.0 / m_pixelPerProjectionX;
}
if (geoHeight == 0)
{
m_pixelPerProjectionY = 0;
m_inversePixelPerProjectionY = 0;
}
else
{
m_pixelPerProjectionY = m_viewHeight / geoHeight;
m_inversePixelPerProjectionY = 1.0 / m_pixelPerProjectionY;
}
}
ChecktLayerState();
}
catch(Exception ex)
{
MessageBox.Show("Error:" + ex.Message,"��ʾ");
}
}
}
public void zoomOut()
{
double halfW = Math.Abs(m_Curextents.Right - m_Curextents.Left) / 4;
double halfH = Math.Abs(m_Curextents.Top - m_Curextents.Bottom) / 4;
Extent zoomGeoExt = new Extent(m_Curextents.Left - halfW, m_Curextents.Right + halfW,
m_Curextents.Bottom - halfH, m_Curextents.Top + halfH);
CalculateVisibleExtents(zoomGeoExt, true, true);
refreshMap(false);
}
private Extent pixcelToGeo(Rectangle pixExtent)
{
//���¼���ɼ���Χ
//���ݴ����extent�����������extent�Ĵ�С��ʹ�����ʵ����Χ��Сһ��
//��������ĵ�
double pCenterX = (pixExtent.Right + pixExtent.Left)/2;
double pCenterY = (pixExtent.Top + pixExtent.Bottom)/2;
//����������곤��
double geoWidth = Math.Abs(m_Curextents.Right - m_Curextents.Left);
double geoHeight = Math.Abs(m_Curextents.Top - m_Curextents.Bottom);
double viewWidth = m_viewWidth;
double viewHeight = m_viewHeight;
Extent newExt = new Extent();
if((viewWidth <=0)||(viewHeight <= 0)||(geoWidth <=0)||(geoHeight<=0))
return newExt;
newExt.Left = m_Curextents.Left + (pixExtent.Left / viewWidth) * geoWidth;
newExt.Right = m_Curextents.Left + (pixExtent.Right / viewWidth) * geoWidth;
newExt.Bottom = m_Curextents.Bottom + (1 - pixExtent.Bottom / viewHeight) * geoHeight;
newExt.Top = m_Curextents.Bottom + (1 - pixExtent.Top / viewHeight) * geoHeight;
return newExt;
}
