protected void BuildLegend(ParametersBase parameters)
{
LegendTitle = parameters.LegendTitle;
IColorSelector color = parameters.Color;
if (String.IsNullOrEmpty(LegendTitle))
{
LegendTitle = "Color";
}
if (LegendTitle.Length > 15)
{
LegendTitle = LegendTitle.Substring(0, 13) + "...";
}
float maxWidth = 0f;
List <string> legendTexts = new List <string>();
if (color is ColorGradient)
{
ColorGradient gradient = color as ColorGradient;
legendTexts = gradient.Stops.Select(s => parameters.LegendTextFormater.Format(s.Value)).ToList();
}
else if (color is ColorPalette)
{
ColorPalette palette = color as ColorPalette;
legendTexts = palette.Colors.Keys.Select(s => parameters.LegendTextFormater.Format(s)).ToList();
}
var sizes = legendTexts.Select(t => DefaultFont.RenderText(t));
maxWidth = sizes.Max(s => s.Width);
LegendTextHeight = sizes.Max(s => s.Height);
//Legend title
var titleSize = DefaultFontBold.RenderText(LegendTitle);
LegendTitleWidth = titleSize.Width;
LegendTitleHeight = titleSize.Height;
if (parameters.LegendPosition == Position.Right || parameters.LegendPosition == Position.Left)
{
maxWidth = Math.Max(maxWidth, (float)(LegendTitleWidth - LegendThickness - SmallMargin));
}
switch (parameters.LegendPosition)
{
case Position.Left:
case Position.Right:
PlotArea = PlotArea.WithWidth(PlotArea.Width - Margin - LegendThickness - SmallMargin - maxWidth);
LegendTitleArea = new Rect(
PlotArea.Left + PlotArea.Width + Margin,
PlotArea.Top,
LegendTitleWidth,
LegendTitleHeight);
LegendArea = new Rect(
PlotArea.Left + PlotArea.Width + Margin,
PlotArea.Top + LegendTitleHeight + SmallMargin,
LegendThickness,
Math.Max(PlotArea.Height - LegendTitleHeight - SmallMargin, 0));
break;
case Position.Top:
case Position.Bottom:
PlotArea = PlotArea.WithHeight(PlotArea.Height - Margin - LegendTitleHeight - SmallMargin - LegendThickness);
if (color is ColorGradient)
{
PlotArea = PlotArea.WithHeight(PlotArea.Height - SmallMargin - LegendTextHeight);
}
LegendTitleArea = new Rect(
Math.Max(PlotArea.Left + (PlotArea.Width - LegendTitleWidth) / 2, 0),
PlotArea.Top + PlotArea.Height + Margin,
LegendTitleWidth,
LegendTitleHeight);
LegendArea = new Rect(
PlotArea.Left,
PlotArea.Top + PlotArea.Height + Margin + LegendTitleHeight + SmallMargin,
PlotArea.Width,
LegendThickness);
break;
default:
break;
}
}