public Bitmap DrawLegend()
{
int lineWidth = 3;
int xOffset = 0;
int yOffset = 0;
int maxTextWidth = 0;
Bitmap bmp = new Bitmap(500, 500);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(ImageBackgroundColor);
g.SmoothingMode = SmoothingMode.AntiAlias;
if (ChartLegend.Layout == LegendLayout.VERTICAL)
{
foreach (LegendEntry entry in ChartLegend.LegendEntries)
{
if (entry.EntryLabel.Dimensions.Value.Width > maxTextWidth)
{
maxTextWidth = (int)entry.EntryLabel.Dimensions.Value.Width;
}
int textHeight = (int)entry.EntryLabel.Dimensions.Value.Height;
if (yOffset == 0)
{
yOffset = (textHeight - ChartLegend.SizeOfLegendIcon) / 2;
}
switch (entry.LegendDisplayShape)
{
case LegendDisplayType.SQUARE:
g.FillRectangle(new SolidBrush(entry.IconColor), new Rectangle(xOffset, yOffset, ChartLegend.SizeOfLegendIcon, ChartLegend.SizeOfLegendIcon));
break;
case LegendDisplayType.LINE:
g.DrawLine(new Pen(entry.IconColor, lineWidth),
new Point(0, yOffset + (textHeight / 2)),
new Point(ChartLegend.SizeOfLegendIcon, yOffset + (textHeight / 2)));
break;
}
xOffset += ChartLegend.SizeOfLegendIcon + ChartLegend.GapBetweenIconAndText;
yOffset -= (textHeight - ChartLegend.SizeOfLegendIcon) / 2;
g.DrawString(entry.EntryLabel.Text, ChartLegend.LegendEntryFont, Brushes.Black, new Point(xOffset, yOffset));
yOffset += textHeight + ChartLegend.GapBetweenIconAndText;
xOffset = 0;
}
yOffset -= ChartLegend.GapBetweenIconAndText;
maxTextWidth += ChartLegend.SizeOfLegendIcon + ChartLegend.GapBetweenIconAndText;
}
else if (ChartLegend.Layout == LegendLayout.HORIZONTAL)
{
// In the HORIZONTAL layout the text is aligned in a single row.
// The gap between an icon and text is GapBetweenIconAndText.
// The gap between the text of an entry and the NEXT entry's icon is 2 x GapBetweenIconAndText.
int textHeight = 0;
foreach (LegendEntry entry in ChartLegend.LegendEntries)
{
textHeight = (int)entry.EntryLabel.Dimensions.Value.Height;
switch (entry.LegendDisplayShape)
{
case LegendDisplayType.SQUARE:
g.FillRectangle(new SolidBrush(entry.IconColor), new Rectangle(xOffset, yOffset, ChartLegend.SizeOfLegendIcon, ChartLegend.SizeOfLegendIcon));
break;
case LegendDisplayType.LINE:
g.DrawLine(new Pen(entry.IconColor, lineWidth),
new Point(0, yOffset + (textHeight / 2)),
new Point(ChartLegend.SizeOfLegendIcon, yOffset + (textHeight / 2)));
break;
}
xOffset += ChartLegend.SizeOfLegendIcon + ChartLegend.GapBetweenIconAndText;
g.DrawString(entry.EntryLabel.Text, ChartLegend.LegendEntryFont, Brushes.Black, new Point(xOffset, yOffset));
xOffset += (int)entry.EntryLabel.Dimensions.Value.Width + (2 * ChartLegend.GapBetweenIconAndText);
}
maxTextWidth = xOffset;
yOffset = textHeight;
}
bmp = ImageMethods.CropImage(bmp, new Rectangle(new Point(0, 0), new Size(maxTextWidth, yOffset)));
}
return(bmp);
}
