/// <summary>
/// Draws the scale division label on a GDI+ surface against the provided x and y axes.
/// </summary>
/// <param name="g">The GDI+ surface on which to draw.</param>
/// <param name="xAxis">The X-Axis to draw against.</param>
/// <param name="yAxis">The Y-Axis to draw against.</param>
///
public void Draw(System.Drawing.Graphics g, PhysicalAxis xAxis, PhysicalAxis yAxis)
{
ArrayList yLargePositions = null;
ArrayList ySmallPositions = null;
yAxis.Axis.WorldTickPositions_FirstPass( yAxis.PhysicalMin, yAxis.PhysicalMax, out yLargePositions, out ySmallPositions );
// test if we have enough y ticks
if (yLargePositions.Count <= this.YPosition) {
if (yLargePositions.Count > 1)
this.YPosition = yLargePositions.Count - 1;
else return;
}
double minX = xAxis.PhysicalToWorld(xAxis.PhysicalMin,false);
double maxX = xAxis.PhysicalToWorld(xAxis.PhysicalMax,false);
double xOffset = this.XPosition;
double xRef = xAxis.PhysicalMin.X;
if (xOffset < 0)
xRef = xAxis.PhysicalMax.X;
if (xOffset < 1 && xOffset > 0)
xOffset = (xAxis.PhysicalMax.X - xAxis.PhysicalMin.X) * this.XPosition;
//*P8 P3*==*P2==*P4
// ||
// ||
// || *P7
// ||
// ||
// P5*==*P1==*P6
//Points for the main-line
PointF p1 = new PointF(Convert.ToSingle(xRef + xOffset), 0.0f);
PointF p2 = p1;
PointF yTick1 = yAxis.WorldToPhysical((double)yLargePositions[yLargePositions.Count-this.YPosition],false);
PointF yTick0 = yAxis.WorldToPhysical((double)yLargePositions[yLargePositions.Count-(this.YPosition+1)],false);
p1.Y = yTick0.Y;
p2.Y = yTick1.Y;
//Points for the upper line
PointF p3 = yTick1;
PointF p4 = p3;
p3.X = Convert.ToSingle(xRef + xOffset - 3);
p4.X = Convert.ToSingle(xRef + xOffset + 3);
//Points for the lower line
PointF p5 = p3;
PointF p6 = p4;
p5.Y = yTick0.Y;
p6.Y = yTick0.Y;
//Label-point
PointF p7 = p6;
p7.Y = p7.Y + (p2.Y - p1.Y)/2;
//Background-point
PointF p8 = p3;
p8.X = Convert.ToSingle((xRef + xOffset) - 14);
double labelValue = (double)yLargePositions[yLargePositions.Count-this.YPosition] -
(double)yLargePositions[yLargePositions.Count-(this.YPosition+1)];
StringBuilder label = new StringBuilder();
label.AppendFormat(this.NumberFormat, labelValue);
float labelLength = g.MeasureString (label.ToString(), this.LabelFont).Width;
float width = Convert.ToSingle((xRef + xOffset) + 14) - p8.X;
float widthMin = (p7.X - p8.X) + labelLength + 2;
if (widthMin > width)
width = widthMin;
float height = p1.Y-p2.Y;
RectangleF bgRect = new RectangleF (p8.X, p8.Y, width, height);
g.FillPath(this.BackgroundBrush, bgRect.RoundCorners(this.BackgroundCornerRadius));
g.DrawString(label.ToString(), this.LabelFont, this.ValueBrush, p7);
g.DrawLine( this.LinePen, (int)p1.X, (int)p1.Y, (int)p2.X, (int)p2.Y );
g.DrawLine( this.LinePen, (int)p3.X, (int)p3.Y, (int)p4.X, (int)p4.Y );
g.DrawLine( this.LinePen, (int)p5.X, (int)p5.Y, (int)p6.X, (int)p6.Y );
}