/// <summary>
/// Create a fill brush using current properties. This method will construct a brush based on the
/// settings of <see cref="ZedGraph.Fill.Type"/>, <see cref="ZedGraph.Fill.Color"/>
/// and <see cref="ZedGraph.Fill.Brush"/>. If
/// <see cref="ZedGraph.Fill.Type"/> is set to <see cref="ZedGraph.FillType.Brush"/> and
/// <see cref="ZedGraph.Fill.Brush"/>
/// is null, then a <see cref="LinearGradientBrush"/> will be created between the colors of
/// <see cref="System.Drawing.Color.White"/> and <see cref="ZedGraph.Fill.Color"/>.
/// </summary>
/// <param name="rect">A rectangle that bounds the object to be filled. This determines
/// the start and end of the gradient fill.</param>
/// <param name="dataValue">The data value to be used for a value-based
/// color gradient. This is only applicable for <see cref="FillType.GradientByX"/>,
/// <see cref="FillType.GradientByY"/> or <see cref="FillType.GradientByZ"/>.</param>
/// <returns>A <see cref="System.Drawing.Brush"/> class representing the fill brush</returns>
public Brush MakeBrush( RectangleF rect, PointPair dataValue )
{
// get a brush
if ( this.IsVisible && ( !_color.IsEmpty || _brush != null ) )
{
if ( rect.Height < 1.0F )
rect.Height = 1.0F;
if ( rect.Width < 1.0F )
rect.Width = 1.0F;
//Brush brush;
if ( _type == FillType.Brush )
{
return ScaleBrush( rect, _brush, _isScaled );
}
else if ( IsGradientValueType )
{
if ( dataValue != null )
{
if ( !_secondaryValueGradientColor.IsEmpty )
{
// Go ahead and create a new Fill so we can do all the scaling, etc.,
// that is associated with a gradient
Fill tmpFill = new Fill( _secondaryValueGradientColor,
GetGradientColor( dataValue ), _angle );
return tmpFill.MakeBrush( rect );
}
else
return new SolidBrush( GetGradientColor( dataValue ) );
}
else if ( _rangeDefault != double.MaxValue )
{
if ( !_secondaryValueGradientColor.IsEmpty )
{
// Go ahead and create a new Fill so we can do all the scaling, etc.,
// that is associated with a gradient
Fill tmpFill = new Fill( _secondaryValueGradientColor,
GetGradientColor( _rangeDefault ), _angle );
return tmpFill.MakeBrush( rect );
}
else
return new SolidBrush( GetGradientColor( _rangeDefault ) );
}
else
return ScaleBrush( rect, _brush, true );
}
else
return new SolidBrush( _color );
}
// Always return a suitable default
return new SolidBrush( Color.White );
}
/// <summary>
/// Do all rendering associated with this <see cref="GasGaugeNeedle"/> item to the specified
/// <see cref="Graphics"/> device. This method is normally only
/// called by the Draw method of the parent <see cref="ZedGraph.CurveList"/>
/// collection object.
/// </summary>
/// <param name="g">
/// A graphic device object to be drawn into. This is normally e.Graphics from the
/// PaintEventArgs argument to the Paint() method.
/// </param>
/// <param name="pane">
/// A reference to the <see cref="ZedGraph.GraphPane"/> object that is the parent or
/// owner of this object.
/// </param>
/// <param name="pos">Not used for rendering GasGaugeNeedle</param>
/// <param name="scaleFactor">Not used for rendering GasGaugeNeedle</param>
public override void Draw( Graphics g, GraphPane pane, int pos, float scaleFactor )
{
if ( pane.Chart._rect.Width <= 0 && pane.Chart._rect.Height <= 0 )
{
_slicePath = null;
}
else
{
CalcRectangle( g, pane, scaleFactor, pane.Chart._rect );
_slicePath = new GraphicsPath();
if ( !_isVisible )
return;
RectangleF tRect = _boundingRectangle;
if ( tRect.Width >= 1 && tRect.Height >= 1 )
{
SmoothingMode sMode = g.SmoothingMode;
g.SmoothingMode = SmoothingMode.AntiAlias;
Matrix matrix = new Matrix();
matrix.Translate( tRect.X + ( tRect.Width / 2 ), tRect.Y + ( tRect.Height / 2 ), MatrixOrder.Prepend );
PointF[] pts = new PointF[2];
pts[0] = new PointF( ( ( tRect.Height * .10f ) / 2.0f ) * (float)Math.Cos( -SweepAngle * Math.PI / 180.0f ),
( ( tRect.Height * .10f ) / 2.0f ) * (float)Math.Sin( -SweepAngle * Math.PI / 180.0f ) );
pts[1] = new PointF( ( tRect.Width / 2.0f ) * (float)Math.Cos( -SweepAngle * Math.PI / 180.0f ),
( tRect.Width / 2.0f ) * (float)Math.Sin( -SweepAngle * Math.PI / 180.0f ) );
matrix.TransformPoints( pts );
Pen p = new Pen( NeedleColor, ( ( tRect.Height * .10f ) / 2.0f ) );
p.EndCap = LineCap.ArrowAnchor;
g.DrawLine( p, pts[0].X, pts[0].Y, pts[1].X, pts[1].Y );
//Fill center 10% with Black dot;
Fill f = new Fill( Color.Black );
RectangleF r = new RectangleF( ( tRect.X + ( tRect.Width / 2 ) ) - 1.0f, ( tRect.Y + ( tRect.Height / 2 ) ) - 1.0f, 1.0f, 1.0f );
r.Inflate( ( tRect.Height * .10f ), ( tRect.Height * .10f ) );
Brush b = f.MakeBrush( r );
g.FillPie( b, r.X, r.Y, r.Width, r.Height, 0.0f, -180.0f );
Pen borderPen = new Pen( Color.White, 2.0f );
g.DrawPie( borderPen, r.X, r.Y, r.Width, r.Height, 0.0f, -180.0f );
g.SmoothingMode = sMode;
}
}
}
