public override void Draw(Graphics graphics, GraphPane pane, float scaleFactor, float shiftPos)
{
if (_formats == null)
{
return;
}
// Scale the coordinates of the DendrogramFormat using the Axis on the other side of the GraphPane
Scale transformScale;
if (_dendrogramLocation == DockStyle.Right)
{
transformScale = pane.YAxis.Scale;
Height = pane.CalcChartRect(graphics).Height;
Width = 100;
}
else
{
transformScale = pane.XAxis.Scale;
Width = pane.CalcChartRect(graphics).Width;
Height = 100;
}
var yAxisWidth = pane.YAxis.CalcSpace(graphics, pane, scaleFactor, out float _);
var xAxisHeight = pane.XAxis.CalcSpace(graphics, pane, scaleFactor, out float _);
foreach (var format in _formats)
{
var leafLocations = format.LeafLocations.Select(kvp => new KeyValuePair <double, double>(
transformScale.Transform(kvp.Key), transformScale.Transform(kvp.Value))).ToList();
var locations = leafLocations.Select(kvp => (kvp.Key + kvp.Value) / 2).ToList();
var lines = format.Data.GetLines(locations, _rectilinearLines).ToList();
var pen = new Pen(Color.Black, 1);
var maxHeight = lines.Max(line => line.Item4);
if (maxHeight == 0)
{
// TODO: Draw a degenerate tree where all nodes connect at the same point
return;
}
var colorFraction = GetFractionForColors(format);
var treeFraction = 1 - colorFraction;
if (treeFraction > 0)
{
var denominator = maxHeight / treeFraction;
var offset = denominator - maxHeight;
foreach (var line in lines)
{
var start = CoordinatesToPoint(line.Item1, (offset + line.Item2) / denominator, pane, xAxisHeight, yAxisWidth);
var end = CoordinatesToPoint(line.Item3, (offset + line.Item4) / denominator, pane, xAxisHeight, yAxisWidth);
DrawLine(graphics, pen, start, end);
}
}
if (colorFraction > 0)
{
for (int colorLevel = 0; colorLevel < format.ColorLevelCount; colorLevel++)
{
for (int iLeaf = 0; iLeaf < format.Colors.Count; iLeaf++)
{
var color = format.Colors[iLeaf][colorLevel];
var left = leafLocations[iLeaf].Key;
var right = leafLocations[iLeaf].Value;
var bottom = colorLevel * colorFraction / format.ColorLevelCount;
var top = (colorLevel + 1) * colorFraction / format.ColorLevelCount;
var topLeft = CoordinatesToPoint(left, top, pane, xAxisHeight, yAxisWidth);
var bottomRight = CoordinatesToPoint(right, bottom, pane, xAxisHeight, yAxisWidth);
var rectangle = new RectangleF(
Math.Min(topLeft.X, bottomRight.X),
Math.Min(topLeft.Y, bottomRight.Y),
Math.Abs(topLeft.X - bottomRight.X),
Math.Abs(topLeft.Y - bottomRight.Y));
graphics.FillRectangle(new SolidBrush(color), rectangle);
}
}
}
var x2AxisHeight = pane.X2Axis.CalcSpace(graphics, pane, scaleFactor, out float _);
var y2AxisWidth = pane.Y2Axis.CalcSpace(graphics, pane, scaleFactor, out float _);
if (_dendrogramLocation == DockStyle.Top)
{
var leftRectangle = new RectangleF(
pane.Rect.Width - yAxisWidth - y2AxisWidth, 0,
yAxisWidth * (float)1.1,
x2AxisHeight);
graphics.FillRectangle(new SolidBrush(Color.White), leftRectangle);
var cornerRectangle = new RectangleF(
-y2AxisWidth, 0,
y2AxisWidth,
x2AxisHeight);
graphics.FillRectangle(new SolidBrush(Color.White), cornerRectangle);
}
if (_dendrogramLocation == DockStyle.Right)
{
var cornerRectangle = new RectangleF(
pane.Rect.Height - xAxisHeight - x2AxisHeight, 0,
x2AxisHeight * (float)1.2,
y2AxisWidth);
graphics.FillRectangle(new SolidBrush(Color.White), cornerRectangle);
var bottomRectangle = new RectangleF(
-xAxisHeight, 0,
xAxisHeight,
y2AxisWidth);
graphics.FillRectangle(new SolidBrush(Color.White), bottomRectangle);
}
}
}