public override void Draw(IRenderContext2D context, IEnumerable <Point> centers)
{
TryCasheResources(context);
var markerLocations = centers.ToArray();
var prevValue = 0d;
for (int i = 0; i < markerLocations.Length; ++i)
{
var metadata = _dataPointMetadata[_dataPointIndexes[i]] as BudgetPointMetadata;
var center = markerLocations[i];
var isGain = metadata.GainLossValue >= prevValue;
DrawDiamond(context, center, Width, Height, _strokePen, isGain ? _gainFillBrush : _lossFillBrush);
prevValue = metadata.GainLossValue;
var gainLossValue = metadata.GainLossValue + "$";
_textBlock.Text = gainLossValue;
_textBlock.MeasureArrange();
var xPos = center.X - _textBlock.DesiredSize.Width / 2;
xPos = xPos < 0 ? TextIndent : xPos;
var marginalRightPos = context.ViewportSize.Width - _textBlock.DesiredSize.Width - TextIndent;
xPos = xPos > marginalRightPos ? marginalRightPos : xPos;
var yPos = center.Y;
var yOffset = isGain ? -_textBlock.DesiredSize.Height - TextIndent : TextIndent;
yPos += yOffset;
var textRect = new Rect(xPos, yPos, _textBlock.DesiredSize.Width, _textBlock.DesiredSize.Height);
context.DrawText(textRect, Stroke, TextSize, gainLossValue, FontFamily, FontWeight, FontStyle);
if (metadata.IsCheckPoint)
{
context.DrawQuad(_strokePen, textRect.TopLeft, textRect.BottomRight);
}
}
}