/// <summary>
/// Renders control points in a graph that derives from Graph2dPiecewiseLinear
/// </summary>
public void Render( IGraphCanvas graphics, GraphTransform transform, IGraph2dSource data, PointF cursorDataPt, bool enabled )
{
if ( data.Disabled )
{
return;
}
GraphX2dSourceFunction1dAdapter pwlGraph = ( GraphX2dSourceFunction1dAdapter )data;
PiecewiseLinearFunction1d pwlFunc = ( PiecewiseLinearFunction1d )pwlGraph.Function;
float tolerance = transform.ScreenToDataYScale * GraphX2dControlPointController.ScreenSelectionTolerance;
int highlightCpIndex = pwlFunc.FindControlPoint( new Point2( cursorDataPt.X, cursorDataPt.Y ), tolerance );
for ( int cpIndex = 0; cpIndex < pwlFunc.NumControlPoints; ++cpIndex )
{
Point2 cp = pwlFunc[ cpIndex ];
PointF screenPt = transform.DataToScreen( new PointF( cp.X, cp.Y ) );
graphics.FillCircle( m_CpBrush, screenPt.X, screenPt.Y, 2 );
if ( cpIndex == highlightCpIndex )
{
graphics.DrawCircle( s_HighlightPen, screenPt.X, screenPt.Y, 4 );
}
}
}
/// <summary>
/// Draws a control point
/// </summary>
private static void DrawControlPoint( IGraphCanvas graphics, Point screenPt, Brush brush, bool highlight )
{
graphics.FillCircle( brush, screenPt.X, screenPt.Y, 2 );
if ( highlight )
{
graphics.DrawCircle( s_HighlightedPen, screenPt.X, screenPt.Y, 4 );
}
}