private void CreatePieShape(INeedle needle)
{
ComplexShape needleShape = (ComplexShape)needle.Shape;
needleShape.Collection.Clear();
PieShape shape = new PieShape(new RectangleF2D(new PointF(0, 30), new SizeF(80, 10)), 40, 270);
shape.Appearance.ContentBrush = new SolidBrushObject(Color.Blue);
shape.Name = "pieNeedle";
needleShape.Add(shape);
}
/// <summary>
/// Render pie 2d plot view.
/// </summary>
/// <param name="dc">Platform no-associated drawing context instance.</param>
protected override void OnPaint(Rendering.DrawingContext dc)
{
base.OnPaint(dc);
var ds = Chart.DataSource;
if (ds != null && ds.SerialCount != 0)
{
var serial = ds[0];
var dataCount = serial.Count;
// Sum up the data values
double sum = 0;
for (int i = 0; i < dataCount; i++)
{
var data = serial[i];
if (data != null)
{
sum += (double)data;
}
}
// Draw the pie shapes
RGFloat currentAngle = 0;
PieShape pie = null;
for (int i = 0; i < dataCount; i++)
{
RGFloat scale = (RGFloat)(360.0 / sum);
var data = serial[i];
if (data != null)
{
RGFloat angle = (RGFloat)(data * scale);
pie = CreatePieShape(ClientBounds);
pie.StartAngle = currentAngle;
pie.SweepAngle = angle;
pie.FillColor = Chart.DataSerialStyles[i].FillColor;
pie.Draw(dc);
currentAngle += angle;
}
}
// Draw the category names over the pie shapes (experimental)
/*currentAngle = 0;
*
* for (int i = 0; i < dataCount; i++)
* {
* RGFloat scale = (RGFloat)(360.0 / sum);
* var data = serial[i];
*
* if (data != null)
* {
* RGFloat angle = (RGFloat)(data * scale);
* currentAngle += angle;
* var itemTitle = ds.GetCategoryName(i);
* if (itemTitle != null)
* {
* angle = currentAngle - angle / 2;
* var bounds = pie.ClientBounds;
* var x = Math.Sin(Math.PI * angle / 180) * bounds.Width / 3;
* var y = Math.Cos(Math.PI * angle / 180) * bounds.Height / -3;
* bounds.Offset((RGFloat)x, (RGFloat)y);
* dc.Graphics.DrawText(itemTitle, FontName, FontSize, ForeColor, bounds,
* ReoGridHorAlign.Center, ReoGridVerAlign.Middle);
* }
* }
* }*/
}
}
