public int IndexOf(ChartColumn column)
{
return(this.List.IndexOf(column));
}
public bool Contains(ChartColumn column)
{
return(this.List.Contains(column));
}
public void Remove(ChartColumn column)
{
this.List.Remove(column);
}
public void Insert(int index, ChartColumn column)
{
this.List.Insert(index, column);
}
public int Add(ChartColumn column)
{
return(this.List.Add(column));
}
protected void PlotData()
{
// TODO: Support for more than one axis!
if (_IndependentColumns.Count == 0)
{
throw new Exception("Graph requires at least one independant column");
}
GraphicsState gs = _Graphics.Save();
_Graphics.TranslateTransform(_Margins.Left, _Margins.Top);
ChartColumn columnX = _IndependentColumns[0];
Range rangeX = columnX.Range;
// Sort the data by independent column
DataView dataView = new DataView(_Data);
dataView.Sort = string.Format("[{0}] ASC", columnX.ColumnName);
DataTable data = dataView.ToTable();
int colNum = 0;
foreach (ChartColumn columnY in _DependentColumns)
{
Range rangeY = columnY.Range;
List <PointF> points = new List <PointF>(512);
float lastX = 0, lastY = 0;
bool firstPoint = true;
foreach (DataRow row in data.Rows)
{
if (row[columnY.ColumnName].GetType() == typeof(DBNull))
{
continue;
}
float x = 0, y = 0;
float yVal = rangeY.Normalize(row[columnY.ColumnName]);
float xVal = rangeX.Normalize(row[columnX.ColumnName]);
y = _Margins.Height - yVal * _Margins.Height;
x = xVal * _Margins.Width;
if (firstPoint)
{
points.Add(new PointF(x, _Margins.Height));
}
firstPoint = false;
points.Add(new PointF(x, y));
lastX = x; lastY = y;
}
points.Add(new PointF(lastX, _Margins.Height));
Color color = ColorTranslator.FromHtml(columnY.LineColor);
Brush plotBrush = new SolidBrush(color);
Pen plotPen = new Pen(color, _PlotWidth);
GraphicsPath path = new GraphicsPath();
switch (_Type)
{
case ChartType.Line:
{
// Line graph
points.RemoveAt(0);
points.RemoveAt(points.Count - 1);
path.AddLines(points.ToArray());
_Graphics.DrawPath(plotPen, path);
}
break;
case ChartType.Area:
{
// Area graph
path.AddLines(points.ToArray());
_Graphics.FillPath(plotBrush, path);
}
break;
case ChartType.Scatter:
{
// Scatter plot
// Skip first and last "anchor" points
for (int i = 1; i < points.Count - 1; i++)
{
path.AddRectangle(new RectangleF(
points[i].X - 2.0f, points[i].Y - 2.0f,
4.0f, 4.0f));
}
_Graphics.DrawPath(plotPen, path);
}
break;
case ChartType.Bar:
{
// Scatter plot
// Skip first and last "anchor" points
float leftOffset = (_DependentColumns.Count * _BarWidth) / 2;
float offset = leftOffset + colNum * _BarWidth;
for (int i = 1; i < points.Count - 1; i++)
{
path.AddRectangle(new RectangleF(
points[i].X - offset, points[i].Y,
_BarWidth, _Margins.Height - points[i].Y));
}
_Graphics.FillPath(plotBrush, path);
}
break;
}
colNum++;
}
_Graphics.Restore(gs);
}
protected void DrawGrid()
{
_Graphics.DrawRectangle(_ForegroundPen, _Margins);
#region Vertical Grid
if (_DrawVerticalGrid || _DrawScale)
{
int rangeCnt = 0;
foreach (Range range in _Ranges)
{
rangeCnt++;
for (int step = 0; step < range.Steps; step++)
{
float y = range.GetStepFloat(step);
float scaledY = (y / range.FloatDiff) * _Margins.Height;
if (_DrawVerticalGrid && rangeCnt == 1)
{
_Graphics.DrawLine(_DarkGridPen,
new PointF(_Margins.Left, (float)(_Margins.Bottom - scaledY)),
new PointF(_Margins.Right, (float)(_Margins.Bottom - scaledY)));
}
if (_DrawScale)
{
float textBoxTop = (float)(_Margins.Bottom - scaledY - _ScaleFont.Height);
float textBoxLeft = 0;
StringFormat labelFmtY = new StringFormat();
labelFmtY.LineAlignment = StringAlignment.Center;
bool drawThisScale = true;
if (rangeCnt == 1) // #1 - left side
{
labelFmtY.Alignment = StringAlignment.Far;
textBoxLeft = 0;
}
else if (rangeCnt == 2)
{
labelFmtY.Alignment = StringAlignment.Near;
textBoxLeft = _Margins.Right;
}
else
{
// Experimental
labelFmtY.Alignment = StringAlignment.Near;
textBoxLeft = _Margins.Right + _ScaleWidth * (rangeCnt - 2);
}
/**
* else // I can only draw two scales, one on either side
* drawThisScale = false;
**/
if (drawThisScale)
{
object mark = range.GetStep(step);
string label = "";
if (mark.GetType() == typeof(DateTime))
{
label = ((DateTime)mark).ToString("d");
}
else if (mark.GetType() == typeof(float))
{
label = ((float)mark).ToString("#,###,###,##0.#####");
}
_Graphics.DrawString(label,
_ScaleFont, _ScaleTextBrush,
new RectangleF(textBoxLeft, textBoxTop, _Margins.Left, _ScaleFont.Height * 2),
labelFmtY);
}
}
}
}
}
#endregion
#region Horizontal Grid
if (_DrawHorizontalGrid || _DrawScale)
{
// TODO: Support for more than one axis!
if (_IndependentColumns.Count == 0)
{
throw new Exception("Graph requires at least one independant column");
}
ChartColumn column = _IndependentColumns[0];
Range range = column.Range;
for (int step = 0; step < range.Steps; step++)
{
float x = range.GetStepFloat(step);
float scaledX = (x / range.FloatDiff) * _Margins.Width;
if (_DrawHorizontalGrid)
{
_Graphics.DrawLine(_DarkGridPen,
new PointF((float)(_Margins.Right - scaledX), _Margins.Top),
new PointF((float)(_Margins.Right - scaledX), _Margins.Bottom));
}
if (_DrawScale)
{
float textBoxLeft = (float)(_Margins.Right - scaledX);
StringFormat labelFmtX = new StringFormat();
labelFmtX.LineAlignment = StringAlignment.Center;
labelFmtX.Alignment = StringAlignment.Far;
bool diagonal = true;
object mark = range.GetStep(step);
string label = "";
if (range.GetType() == typeof(TimeRange))
{
if (((TimeRange)range).Interval.Interval == DateInterval.Hourly)
{
label = ((DateTime)mark).ToString("g");
}
else
{
label = ((DateTime)mark).ToString("d");
}
}
else if (range.GetType() == typeof(NumberRange))
{
label = ((float)mark).ToString("#,###,###,##0.#####");
}
// Save state
GraphicsState gs = _Graphics.Save();
// Translate and Rotate
_Graphics.ResetTransform();
_Graphics.TranslateTransform(textBoxLeft, _Margins.Bottom + 5);
if (diagonal)
{
_Graphics.RotateTransform(-45);
}
_Graphics.DrawString(label,
_ScaleFont, _ScaleTextBrush,
new Point(0, 0 /*, _Margins.Left, _ScaleFont.Height * 2*/),
labelFmtX);
_Graphics.Restore(gs);
}
}
}
#endregion
}