/// <summary>
/// Paints the axis break line.
/// </summary>
/// <param name="graph">Chart graphics to use.</param>
/// <param name="nextSegment">Axis scale segment next to current.</param>
internal void PaintBreakLine(ChartGraphics graph, AxisScaleSegment nextSegment)
{
// Get break line position
RectangleF breakPosition = this.GetBreakLinePosition(graph, nextSegment);
// Get top line graphics path
GraphicsPath breakLinePathTop = this.GetBreakLinePath(breakPosition, true);
GraphicsPath breakLinePathBottom = null;
// Clear break line space using chart color behind the area
if (breakPosition.Width > 0f && breakPosition.Height > 0f)
{
// Get bottom line graphics path
breakLinePathBottom = this.GetBreakLinePath(breakPosition, false);
// Clear plotting area background
using (GraphicsPath fillPath = new GraphicsPath())
{
// Create fill path out of top and bottom break lines
fillPath.AddPath(breakLinePathTop, true);
fillPath.Reverse();
fillPath.AddPath(breakLinePathBottom, true);
fillPath.CloseAllFigures();
// Use chart back color to fill the area
using (Brush fillBrush = this.GetChartFillBrush(graph))
{
graph.FillPath(fillBrush, fillPath);
// Check if shadow exsits in chart area
if (this.axis.ChartArea.ShadowOffset != 0 && !this.axis.ChartArea.ShadowColor.IsEmpty)
{
// Clear shadow
RectangleF shadowPartRect = breakPosition;
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
shadowPartRect.Y += this.axis.ChartArea.ShadowOffset;
shadowPartRect.Height -= this.axis.ChartArea.ShadowOffset;
shadowPartRect.X = shadowPartRect.Right - 1;
shadowPartRect.Width = this.axis.ChartArea.ShadowOffset + 2;
}
else
{
shadowPartRect.X += this.axis.ChartArea.ShadowOffset;
shadowPartRect.Width -= this.axis.ChartArea.ShadowOffset;
shadowPartRect.Y = shadowPartRect.Bottom - 1;
shadowPartRect.Height = this.axis.ChartArea.ShadowOffset + 2;
}
graph.FillRectangle(fillBrush, shadowPartRect);
// Draw new shadow
using (GraphicsPath shadowPath = new GraphicsPath())
{
shadowPath.AddPath(breakLinePathTop, false);
// Define maximum size
float size = this.axis.ChartArea.ShadowOffset;
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
size = Math.Min(size, breakPosition.Height);
}
else
{
size = Math.Min(size, breakPosition.Width);
}
// Define step to increase transperancy
int transparencyStep = (int)(this.axis.ChartArea.ShadowColor.A / size);
// Set clip region to achieve spacing of the shadow
// Start with the plotting rectangle position
RectangleF clipRegion = graph.GetAbsoluteRectangle(this.axis.PlotAreaPosition.ToRectangleF());
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
clipRegion.X += this.axis.ChartArea.ShadowOffset;
clipRegion.Width += this.axis.ChartArea.ShadowOffset;
}
else
{
clipRegion.Y += this.axis.ChartArea.ShadowOffset;
clipRegion.Height += this.axis.ChartArea.ShadowOffset;
}
graph.SetClip(graph.GetRelativeRectangle(clipRegion));
// Draw several lines to form shadow
for (int index = 0; index < size; index++)
{
using (Matrix newMatrix = new Matrix())
{
// Shift top break line by 1 pixel
if (this.axis.AxisPosition == AxisPosition.Right || this.axis.AxisPosition == AxisPosition.Left)
{
newMatrix.Translate(0f, 1f);
}
else
{
newMatrix.Translate(1f, 0f);
}
shadowPath.Transform(newMatrix);
}
// Get line color
Color color = Color.FromArgb(
this.axis.ChartArea.ShadowColor.A - transparencyStep * index,
this.axis.ChartArea.ShadowColor);
using (Pen shadowPen = new Pen(color, 1))
{
// Draw shadow
graph.DrawPath(shadowPen, shadowPath);
}
}
graph.ResetClip();
}
}
}
}
}
// Draw Separator Line(s)
if (this.axis.ScaleBreakStyle.BreakLineStyle != BreakLineStyle.None)
{
using (Pen pen = new Pen(this.axis.ScaleBreakStyle.LineColor, this.axis.ScaleBreakStyle.LineWidth))
{
// Set line style
pen.DashStyle = graph.GetPenStyle(this.axis.ScaleBreakStyle.LineDashStyle);
// Draw break lines
graph.DrawPath(pen, breakLinePathTop);
if (breakPosition.Width > 0f && breakPosition.Height > 0f)
{
graph.DrawPath(pen, breakLinePathBottom);
}
}
}
// Dispose break line paths
breakLinePathTop.Dispose();
breakLinePathTop = null;
if (breakLinePathBottom != null)
{
breakLinePathBottom.Dispose();
breakLinePathBottom = null;
}
}
