/// <summary>
/// Highlight a geographic object.
/// </summary>
/// @param record_number Array index of the record to be highlighted.
/// @param c The color to use to highlight the record.
private void Highlight(int record_number, Color c)
{
RenderThread drawThread;
Pen tempPen = (Pen) _pen.Clone();
tempPen.Color = c;
if ( _ShapeType == ShapeType.Line )
{
tempPen.Width += 2;
tempPen.StartCap = LineCap.RoundAnchor;
tempPen.EndCap = LineCap.RoundAnchor;
}
HatchBrush tempBrush = new HatchBrush( HatchStyle.Percent70, c, Color.Transparent );
drawThread = new RenderThread( _mapMetrics, _features,
_ShapeType, record_number, record_number + 1, tempPen, tempBrush );
drawThread.Start();
tempPen.Dispose();
tempBrush.Dispose();
}
/// <summary>
/// Calculates how many features each RenderThread will draw. Then each
/// rendering thread is started and we wait for all of the threads to finish
/// before continuing on.
/// </summary>
public void Draw()
{
GenerateDrawList();
for ( int a=0; a<NUM_THREADS; ++a )
{
if ( a == NUM_THREADS - 1 )
{
drawThreads[ a ] = new RenderThread( _mapMetrics, _features,
_ShapeType, a * threadBoundary, _features.Length, _pen, _brush );
}
else
{
drawThreads[ a ] = new RenderThread( _mapMetrics, _features,
_ShapeType, a * threadBoundary, (a + 1) * threadBoundary, _pen, _brush );
}
threads[ a ] = new Thread( new ThreadStart( drawThreads[a].Start ) );
threads[ a ].Start();
}
for ( int b=0; b<NUM_THREADS; ++b )
{
threads[b].Join();
}
// if a feature has been highlighted with a query
if ( _highlightedFeature != -1 )
{
this.Highlight( _highlightedFeature, SystemColors.Highlight );
}
}