/// <summary>
/// Draws the marker given through rendererInfo at the specified position. Position specifies
/// the center of the marker.
/// </summary>
internal static void Draw(XGraphics graphics, XPoint pos, MarkerRendererInfo rendererInfo)
{
if (rendererInfo.MarkerStyle == MarkerStyle.None)
return;
double size = rendererInfo.MarkerSize;
double size2 = size / 2;
double x0, y0, x1, y1;
double g;
XPen foreground = new XPen(rendererInfo.MarkerForegroundColor, 0.5);
XBrush background = new XSolidBrush(rendererInfo.MarkerBackgroundColor);
XGraphicsPath gp = new XGraphicsPath();
switch (rendererInfo.MarkerStyle)
{
case MarkerStyle.Square:
x0 = pos.X - size2;
y0 = pos.Y - size2;
x1 = pos.X + size2;
y1 = pos.Y + size2;
gp.AddLine(x0, y0, x1, y0);
gp.AddLine(x1, y0, x1, y1);
gp.AddLine(x1, y1, x0, y1);
gp.AddLine(x0, y1, x0, y0);
break;
case MarkerStyle.Diamond:
gp.AddLine(x1 = pos.X + size2, pos.Y, pos.X, y0 = pos.Y - size2);
gp.AddLine(pos.X, y0, x0 = pos.X - size2, pos.Y);
gp.AddLine(x0, pos.Y, pos.X, y1 = pos.Y + size2);
gp.AddLine(pos.X, y1, x1, pos.Y);
break;
case MarkerStyle.Triangle:
y0 = pos.Y + size / 2;
y1 = pos.Y - size / 2;
g = Math.Sqrt(size * size * 4 / 3) / 2;
gp.AddLine(pos.X, y1, pos.X + g, y0);
gp.AddLine(pos.X + g, y0, pos.X - g, y0);
gp.AddLine(pos.X - g, y0, pos.X, y1);
break;
case MarkerStyle.Plus:
g = size2 / 4;
gp.AddLine(pos.X - size2, pos.Y + g, pos.X - g, pos.Y + g);
gp.AddLine(pos.X - g, pos.Y + g, pos.X - g, pos.Y + size2);
gp.AddLine(pos.X - g, pos.Y + size2, pos.X + g, pos.Y + size2);
gp.AddLine(pos.X + g, pos.Y + size2, pos.X + g, pos.Y + g);
gp.AddLine(pos.X + g, pos.Y + g, pos.X + size2, pos.Y + g);
gp.AddLine(pos.X + size2, pos.Y + g, pos.X + size2, pos.Y - g);
gp.AddLine(pos.X + size2, pos.Y - g, pos.X + g, pos.Y - g);
gp.AddLine(pos.X + g, pos.Y - g, pos.X + g, pos.Y - size2);
gp.AddLine(pos.X + g, pos.Y - size2, pos.X - g, pos.Y - size2);
gp.AddLine(pos.X - g, pos.Y - size2, pos.X - g, pos.Y - g);
gp.AddLine(pos.X - g, pos.Y - g, pos.X - size2, pos.Y - g);
gp.AddLine(pos.X - size2, pos.Y - g, pos.X - size2, pos.Y + g);
break;
case MarkerStyle.Circle:
case MarkerStyle.Dot:
x0 = pos.X - size2;
y0 = pos.Y - size2;
gp.AddEllipse(x0, y0, size, size);
break;
case MarkerStyle.Dash:
x0 = pos.X - size2;
y0 = pos.Y - size2 / 3;
x1 = pos.X + size2;
y1 = pos.Y + size2 / 3;
gp.AddLine(x0, y0, x1, y0);
gp.AddLine(x1, y0, x1, y1);
gp.AddLine(x1, y1, x0, y1);
gp.AddLine(x0, y1, x0, y0);
break;
case MarkerStyle.X:
g = size / 4;
gp.AddLine(pos.X - size2 + g, pos.Y - size2, pos.X, pos.Y - g);
gp.AddLine(pos.X, pos.Y - g, pos.X + size2 - g, pos.Y - size2);
gp.AddLine(pos.X + size2 - g, pos.Y - size2, pos.X + size2, pos.Y - size2 + g);
gp.AddLine(pos.X + size2, pos.Y - size2 + g, pos.X + g, pos.Y);
gp.AddLine(pos.X + g, pos.Y, pos.X + size2, pos.Y + size2 - g);
gp.AddLine(pos.X + size2, pos.Y + size2 - g, pos.X + size2 - g, pos.Y + size2);
gp.AddLine(pos.X + size2 - g, pos.Y + size2, pos.X, pos.Y + g);
gp.AddLine(pos.X, pos.Y + g, pos.X - size2 + g, pos.Y + size2);
gp.AddLine(pos.X - size2 + g, pos.Y + size2, pos.X - size2, pos.Y + size2 - g);
gp.AddLine(pos.X - size2, pos.Y + size2 - g, pos.X - g, pos.Y);
gp.AddLine(pos.X - g, pos.Y, pos.X - size2, pos.Y - size2 + g);
break;
case MarkerStyle.Star:
{
XPoint[] points = new XPoint[10];
double radStep = 2 * Math.PI / 5;
double outerCircle = size / 2;
double innerCircle = size / 5;
// outer circle
double rad = -(Math.PI / 2); // 90°
for (int idx = 0; idx < 10; idx += 2)
{
points[idx].X = pos.X + outerCircle * Math.Cos(rad);
points[idx].Y = pos.Y + outerCircle * Math.Sin(rad);
rad += radStep;
}
// inner circle
rad = -(Math.PI / 4); // 45°
double x = innerCircle * Math.Cos(rad);
double y = innerCircle * Math.Sin(rad);
points[1].X = pos.X + x;
points[1].Y = pos.Y + y;
points[9].X = pos.X - x;
points[9].Y = pos.Y + y;
rad += radStep;
x = innerCircle * Math.Cos(rad);
y = innerCircle * Math.Sin(rad);
points[3].X = pos.X + x;
points[3].Y = pos.Y + y;
points[7].X = pos.X - x;
points[7].Y = pos.Y + y;
rad += radStep;
y = innerCircle * Math.Sin(rad);
points[5].X = pos.X;
points[5].Y = pos.Y + y;
gp.AddLines(points);
}
break;
}
gp.CloseFigure();
if (rendererInfo.MarkerStyle != MarkerStyle.Dot)
{
graphics.DrawPath(background, gp);
graphics.DrawPath(foreground, gp);
}
}
