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<font color= "blue">using</font> System;
<font color= "blue">using</font> System.Collections;
<font color= "blue">using</font> System.Drawing;
<font color= "blue">using</font> System.Drawing.Imaging;
<font color= "blue">using</font> System.Drawing.Drawing2D;
<font color= "blue"></font>
<font color= "blue">namespace</font> ASPNET.StarterKit.Chart
<font color= "blue"></font>{
<font color= "green"> //*********************************************************************</font>
<font color= "green"> //</font>
<font color= "green"> // PieChart Class</font>
<font color= "green"> //</font>
<font color= "green"> // This class uses GDI+ to render Pie Chart.</font>
<font color= "green"> //</font>
<font color= "green"> //*********************************************************************</font>
<font color= "blue"></font>
<font color= "blue"> public class</font> PieChart : Chart
<font color= "blue"> </font>{
<font color= "blue"> private const </font>int _bufferSpace = 125;
<font color= "blue"> private </font>ArrayList _chartItems;
<font color= "blue"> private </font>int _perimeter;
<font color= "blue"> private </font>Color _backgroundColor;
<font color= "blue"> private </font>Color _borderColor;
<font color= "blue"> private </font>float _total;
<font color= "blue"> private </font>int _legendWidth;
<font color= "blue"> private </font>int _legendHeight;
<font color= "blue"> private </font>int _legendFontHeight;
<font color= "blue"> private </font>string _legendFontStyle;
<font color= "blue"> private </font>float _legendFontSize;
<font color= "blue"></font>
<font color= "blue"> public </font>PieChart()
<font color= "blue"> </font>{
<font color= "blue"> </font>_chartItems = new ArrayList();
<font color= "blue"> </font>_perimeter = 250;
<font color= "blue"> </font>_backgroundColor = Color.White;
<font color= "blue"> </font>_borderColor = Color.FromArgb(63,63,63);
<font color= "blue"> </font>_legendFontSize = 8;
<font color= "blue"> </font>_legendFontStyle = "Verdana";
<font color= "blue"> </font>}
<font color= "blue"></font>
<font color= "blue"> public </font>PieChart(Color bgColor)
<font color= "blue"> </font>{
<font color= "blue"> </font>_chartItems = new ArrayList();
<font color= "blue"> </font>_perimeter = 250;
<font color= "blue"> </font>_backgroundColor = bgColor;
<font color= "blue"> </font>_borderColor = Color.FromArgb(63,63,63);
<font color= "blue"> </font>_legendFontSize = 8;
<font color= "blue"> </font>_legendFontStyle = "Verdana";
<font color= "blue"> </font>}
<font color= "blue"></font>
<font color= "green"> //*********************************************************************</font>
<font color= "green"> //</font>
<font color= "green"> // This method collects all data points and calculate all the necessary dimensions </font>
<font color= "green"> // to draw the chart. It is the first method called before invoking the Draw() method.</font>
<font color= "green"> //</font>
<font color= "green"> //*********************************************************************</font>
<font color= "blue"></font>
<font color= "blue"> public void</font> CollectDataPoints(string[] xValues, string[] yValues)
<font color= "blue"> </font>{
<font color= "blue"> </font>_total = 0.0f;
<font color= "blue"> </font>
<font color= "blue"> for</font> (int i = 0;i < xValues.Length;i++)
<font color= "blue"> </font>{
<font color= "blue"> </font>float ftemp = Convert.ToSingle(yValues[i]);
<font color= "blue"> </font>_chartItems.Add(new ChartItem(xValues[i], xValues.ToString(), ftemp, 0, 0, Color.AliceBlue));
<font color= "blue"> </font>_total += ftemp;
<font color= "blue"> </font>}
<font color= "blue"> </font>
<font color= "blue"> </font>float nextStartPos = 0.0f;
<font color= "blue"> </font>int counter = 0;
<font color= "blue"> </font>foreach (ChartItem item in _chartItems)
<font color= "blue"> </font>{
<font color= "blue"> </font>item.StartPos = nextStartPos;
<font color= "blue"> </font>item.SweepSize = item.Value / _total * 360;
<font color= "blue"> </font>nextStartPos = item.StartPos + item.SweepSize;
<font color= "blue"> </font>item.ItemColor = GetColor(counter++);
<font color= "blue"> </font>}
<font color= "blue"></font>
<font color= "blue"> </font>CalculateLegendWidthHeight();
<font color= "blue"> </font>}
<font color= "blue"></font>
<font color= "green"> //*********************************************************************</font>
<font color= "green"> //</font>
<font color= "green"> // This method returns a bitmap to the calling function. This is the method</font>
<font color= "green"> // that actually draws the pie chart and the legend with it.</font>
<font color= "green"> //</font>
<font color= "green"> //*********************************************************************</font>
<font color= "blue"></font>
<font color= "blue"> public </font>override Bitmap Draw()
<font color= "blue"> </font>{
<font color= "blue"> </font>int perimeter = _perimeter;
<font color= "blue"> </font>Rectangle pieRect = new Rectangle(0, 0, perimeter, perimeter-1);
<font color= "blue"> </font>Bitmap bmp = new Bitmap(perimeter + _legendWidth, perimeter);
<font color= "blue"> </font>Graphics grp = Graphics.FromImage(bmp);
<font color= "blue"> </font>
<font color= "green"> //Paint Back ground</font>
<font color= "blue"> </font>grp.FillRectangle(new SolidBrush(_backgroundColor), 0, 0, perimeter + _legendWidth, perimeter);
<font color= "blue"></font>
<font color= "green"> //Align text to the right</font>
<font color= "blue"> </font>StringFormat sf = new StringFormat();
<font color= "blue"> </font>sf.Alignment = StringAlignment.Far;
<font color= "blue"> </font>
<font color= "green"> //Draw all wedges and legends</font>
<font color= "blue"> </font>for(int i=0; i<_chartItems.Count; i++)
<font color= "blue"> </font>{
<font color= "blue"> </font>ChartItem item = (ChartItem) _chartItems[i];
<font color= "blue"> </font>SolidBrush brs = new SolidBrush(item.ItemColor);
<font color= "blue"> </font>grp.FillPie(brs, pieRect, item.StartPos, item.SweepSize);
<font color= "blue"> </font>grp.FillRectangle(brs, perimeter + _bufferSpace, i * _legendFontHeight + 15, 10, 10);
<font color= "blue"> </font>grp.DrawString(item.Label, new Font(_legendFontStyle, _legendFontSize),
<font color= "blue"> </font>new SolidBrush(Color.Black), perimeter + _bufferSpace + 20, i * _legendFontHeight + 13);
<font color= "blue"></font>
<font color= "blue"> </font>grp.DrawString(item.Value.ToString("C"), new Font(_legendFontStyle, _legendFontSize),
<font color= "blue"> </font>new SolidBrush(Color.Black), perimeter + _bufferSpace + 200, i * _legendFontHeight + 13,sf);
<font color= "blue"> </font>}
<font color= "blue"> </font>
<font color= "green"> //draws the border around Pie</font>
<font color= "blue"> </font>grp.DrawEllipse(new Pen(_borderColor, 2), pieRect);
<font color= "blue"></font>
<font color= "green"> //draw border around legend</font>
<font color= "blue"> </font>grp.DrawRectangle(new Pen(_borderColor, 1), perimeter + _bufferSpace - 10, 10, 220, _chartItems.Count * _legendFontHeight + 25);
<font color= "blue"></font>
<font color= "green"> //Draw Total under legend</font>
<font color= "blue"> </font>grp.DrawString("Total", new Font(_legendFontStyle, _legendFontSize, FontStyle.Bold),
<font color= "blue"> </font>new SolidBrush(Color.Black), perimeter + _bufferSpace + 30, (_chartItems.Count+1) * _legendFontHeight,sf);
<font color= "blue"> </font>grp.DrawString(_total.ToString("C"), new Font(_legendFontStyle, _legendFontSize, FontStyle.Bold),
<font color= "blue"> </font>new SolidBrush(Color.Black), perimeter + _bufferSpace + 200, (_chartItems.Count+1) * _legendFontHeight,sf);
<font color= "blue"> </font>
<font color= "blue"> </font>grp.SmoothingMode = SmoothingMode.AntiAlias;
<font color= "blue"> </font>grp.Dispose();
<font color= "blue"> return</font> bmp;
<font color= "blue"> </font>}
<font color= "blue"></font>
<font color= "green"> //*********************************************************************</font>
<font color= "green"> //</font>
<font color= "green"> // This method calculates the space required to draw the chart legend.</font>
<font color= "green"> //</font>
<font color= "green"> //*********************************************************************</font>
<font color= "blue"> </font>
<font color= "blue"> private void</font> CalculateLegendWidthHeight()
<font color= "blue"> </font>{
<font color= "blue"> </font>Font fontLegend = new Font(_legendFontStyle, _legendFontSize);
<font color= "blue"> </font>_legendFontHeight = fontLegend.Height+5;
<font color= "blue"> </font>_legendHeight = fontLegend.Height * (_chartItems.Count + 1);
<font color= "blue"></font><font color= "blue"> if </font>(_legendHeight > _perimeter) _perimeter = _legendHeight;<font color= "blue"></font>
<font color= "blue"></font>
<font color= "blue"> </font>_legendWidth = _perimeter + _bufferSpace;
<font color= "blue"> </font>}
<font color= "blue"> </font>}
<font color= "blue"></font>}
</pre>
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