//*********************************************************************
//
// This method calculates the space required to draw the chart legend.
//
//*********************************************************************
private void CalculateLegendWidthHeight()
{
Font fontLegend = new Font(_legendFontStyle, _legendFontSize);
_legendFontHeight = fontLegend.Height + 5;
_legendHeight = _legendFontHeight * (Items.Count);
if (_legendHeight > Radius)
{
Radius = _legendHeight;
}
Width = 2 * _spacer + Radius;
_legendWidth = _bufferSpace;
Bitmap bmp = new Bitmap(Width + _legendWidth + _spacer,
_spacer + _titleHeight + _spacer + Radius + _spacer);
Graphics grp = Graphics.FromImage(bmp);
grp.SmoothingMode = SmoothingMode.AntiAlias;
for (int i = 0; i < Items.Count; i++)
{
ChartItem item = (ChartItem)Items[i];
SizeF LabelSize = grp.MeasureString(item.Label, new Font(_legendFontStyle, _legendFontSize));
if (LabelSize.Width > _maxLegendWidth)
{
_maxLegendWidth = LabelSize.Width;
}
}
_maxLegendWidth += 15;
if (_maxLegendWidth > _legendWidth)
{
_legendWidth = (int)Math.Round(_maxLegendWidth);
}
}
public override void Draw(Graphics graphics)
{
int width = Width;
int spacer = _spacer;
Rectangle pieRect = new Rectangle(
(width - Radius) / 2, spacer + _titleHeight,
Radius, Radius);
StringFormat sf = null;
try
{
sf = new StringFormat();
//Paint Back ground
graphics.FillRectangle(new SolidBrush(_backgroundColor), 0, 0, width + _legendWidth + _spacer,
spacer + _titleHeight + spacer + Radius + spacer);
graphics.SmoothingMode = SmoothingMode.AntiAlias;
//Align text to the right
sf.Alignment = StringAlignment.Near;
SizeF titlesize = graphics.MeasureString(Title, new Font(_legendFontStyle, _legendFontSize));
graphics.DrawString(Title, new Font(_legendFontStyle, _legendFontSize),
new SolidBrush(Color.Black), (width + _legendWidth + _spacer - titlesize.Width) / 2, spacer);
//Draw all wedges and legends
for (int i = 0; i < Items.Count; i++)
{
ChartItem item = (ChartItem)Items[i];
SolidBrush brs = null;
try
{
brs = new SolidBrush(item.ItemColor);
graphics.FillPie(brs, pieRect, item.StartPos, item.SweepSize);
float fPerc = (float)100 * item.Value / _total;
if (DrawPercents && fPerc >= MinPercentToDraw)
{
string sPerc = (Math.Round(fPerc, 2)).ToString(CultureInfo.CurrentUICulture) + "%";
SizeF PercSize = graphics.MeasureString(sPerc, new Font(_legendFontStyle, _legendFontSize));
double _angle = Math.PI * (item.StartPos + item.SweepSize / 2) / 180;
double fcos = _const * Radius * Math.Cos(_angle) / 2;
double fsin = _const * Radius * Math.Sin(_angle) / 2;
float fx = (float)(width / 2 - PercSize.Width / 2 + fcos);
float fy = (float)(spacer + _titleHeight + Radius / 2 + fsin - PercSize.Height / 2);
graphics.DrawString(sPerc, new Font(_legendFontStyle, _legendFontSize),
new SolidBrush(Color.Black), fx, fy);
}
graphics.FillRectangle(brs, width + (_legendWidth - _maxLegendWidth) / 2,
_titleHeight + i * _legendFontHeight + spacer * 2, 10, 10);
graphics.DrawString(item.Label, new Font(_legendFontStyle, _legendFontSize), new SolidBrush(Color.Black),
width + (_legendWidth - _maxLegendWidth) / 2 + 15, _titleHeight + i * _legendFontHeight + spacer * 2);
}
finally
{
if (brs != null)
{
brs.Dispose();
}
}
}
//draws the border around Pie
graphics.DrawEllipse(new Pen(_borderColor, 1), pieRect);
//draw border around Chart
if (BorderWidth > 0)
{
graphics.DrawRectangle(new Pen(_borderColor, BorderWidth), 0, 0, width + _legendWidth + _spacer - 1, Radius + _titleHeight + 3 * spacer - 1);
}
//Draw Total under legend
graphics.SmoothingMode = SmoothingMode.AntiAlias;
}
finally
{
if (sf != null)
{
sf.Dispose();
}
if (graphics != null)
{
graphics.Dispose();
}
}
}
public override void Draw(Graphics graphics)
{
int width = Width;
int spacer = _spacer;
StringFormat sf = null;
try
{
sf = new StringFormat();
//Paint Back ground
graphics.FillRectangle(new SolidBrush(_backgroundColor), 0, 0, width + 20,
spacer + _titleHeight + spacer + Height + 2 * spacer);
graphics.SmoothingMode = SmoothingMode.AntiAlias;
//Align text to the right
sf.Alignment = StringAlignment.Near;
SizeF titlesize = graphics.MeasureString(Title, new Font(_legendFontStyle, _legendFontSize));
graphics.DrawString(Title, new Font(_legendFontStyle, _legendFontSize),
new SolidBrush(Color.Black), (width - titlesize.Width) / 2, spacer);
float MaxValue = 1;
MaxValue = 0;
foreach (ChartItem ci in Items)
{
if (ci.Value > MaxValue)
{
MaxValue = ci.Value;
}
}
for (int i = 0; i < Items.Count; i++)
{
ChartItem item = (ChartItem)Items[i];
SolidBrush brs = null;
try
{
brs = new SolidBrush(item.ItemColor);
int _curHeight = (int)Math.Round((Height - _maxLegendWidth) * item.Value / MaxValue);
if (_curHeight == 0)
{
_curHeight = 1;
}
string sValue = (Math.Round(item.Value, 2)).ToString(CultureInfo.CurrentUICulture);
SizeF sValueSize = graphics.MeasureString(sValue, new Font(_legendFontStyle, _legendFontSize));
SizeF sLabelSize = graphics.MeasureString(item.Label, new Font(_legendFontStyle, _legendFontSize));
graphics.FillRectangle(brs, item.StartPos, spacer + _titleHeight + Height -
_maxLegendWidth - _curHeight,
_gistwidth, _curHeight);
if (sValueSize.Width <= _gistwidth && sValueSize.Height <= _curHeight)
{
graphics.DrawString(sValue,
new Font(_legendFontStyle, _legendFontSize),
new SolidBrush(Color.Black),
item.StartPos + _gistwidth / 2 - sValueSize.Width / 2,
spacer + _titleHeight + Height - _maxLegendWidth - _curHeight / 2 - sValueSize.Height / 2);
}
if (_maxLegendWidth >= _gistwidth)
{
System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical);
graphics.DrawString(item.Label, new Font(_legendFontStyle, _legendFontSize), new SolidBrush(Color.Black),
item.StartPos + _gistwidth / 2 - sLabelSize.Height / 2,
spacer + _titleHeight + Height - _maxLegendWidth + spacer, drawFormat);
}
else
{
graphics.DrawString(item.Label, new Font(_legendFontStyle, _legendFontSize), new SolidBrush(Color.Black),
item.StartPos + _gistwidth / 2 - sLabelSize.Width / 2,
spacer + _titleHeight + Height + spacer);
}
}
finally
{
if (brs != null)
{
brs.Dispose();
}
}
}
//draw border around Chart
if (BorderWidth > 0)
{
graphics.DrawRectangle(new Pen(_borderColor, BorderWidth), 0, 0, width - 1, Height + _titleHeight + 4 * spacer - 1);
}
//Draw Total under legend
graphics.SmoothingMode = SmoothingMode.AntiAlias;
}
finally
{
if (sf != null)
{
sf.Dispose();
}
if (graphics != null)
{
graphics.Dispose();
}
}
}
