private Rectangle GetLabelBounds(Graphics grf, ChartLabel cl, Rectangle rectChart)
{
if (cl == null || string.IsNullOrEmpty(cl.Text))
{
return(Rectangle.Empty);
}
Rectangle rect;
if (cl.AutoSize)
{
SizeF sizef = grf.MeasureString(cl.Text, (cl.Font != null) ? cl.Font : this.Font);
rect = new Rectangle(0, 0, (int)Math.Ceiling(sizef.Width), (int)Math.Ceiling(sizef.Height));
}
else
{
rect = new Rectangle(0, 0, cl.Size.Width, cl.Size.Height);
}
switch (cl.Alignment)
{
case ContentAlignment.TopLeft:
rect.Location = cl.Location;
break;
case ContentAlignment.TopCenter:
rect.Location = new Point(rectChart.Left + rectChart.Left + (rectChart.Width - rect.Width) / 2, rectChart.Top + cl.Location.Y);
break;
case ContentAlignment.TopRight:
rect.Location = new Point(rectChart.Right - cl.Location.X - rect.Width, rectChart.Top + cl.Location.Y);
break;
case ContentAlignment.MiddleLeft:
rect.Location = new Point(rectChart.Left + cl.Location.X, rectChart.Top + (rectChart.Height - rect.Height) / 2);
break;
case ContentAlignment.MiddleCenter:
rect.Location = new Point(rectChart.Left + (rectChart.Width - rect.Width) / 2, rectChart.Top + (rectChart.Height - rect.Height) / 2);
break;
case ContentAlignment.MiddleRight:
rect.Location = new Point(rectChart.Right - cl.Location.X - rect.Width, rectChart.Top + (rectChart.Height - rect.Height) / 2);
break;
case ContentAlignment.BottomLeft:
rect.Location = new Point(rectChart.Left + cl.Location.X, rectChart.Bottom - cl.Location.Y - rect.Height);
break;
case ContentAlignment.BottomCenter:
rect.Location = new Point(rectChart.Left + (rectChart.Width - rect.Width) / 2, rectChart.Bottom - cl.Location.Y - rect.Height);
break;
case ContentAlignment.BottomRight:
rect.Location = new Point(rectChart.Right - cl.Location.X - rect.Width, rectChart.Bottom - cl.Location.Y - rect.Height);
break;
}
return(rect);
}
protected virtual void DrawLable(ChartLabel cl, ChartPaintEventArgs e)
{
if (cl == null || !cl.Visible || string.IsNullOrEmpty(cl.Text))
{
return;
}
//Rectangle rect_chart = new Rectangle(0, 0, this.ContentSize.Width, this.ContentSize.Height);
Rectangle rect_chart = new Rectangle(0, 0, this.ContentSize.Width, this.ContentSize.Height);
Rectangle rect = GetLabelBounds(e.Graphics, cl, rect_chart);
if (rect.Width == 0 || rect.Height == 0)
{
return;
}
if (cl.BackColor.HasValue)
{
e.Graphics.FillRectangle(new SolidBrush(cl.BackColor.Value), rect);
}
e.Graphics.DrawString(cl.Text, (cl.Font == null ? e.Font : cl.Font),
(cl.ForeColor.HasValue ? new SolidBrush(cl.ForeColor.Value) : e.ForeBrush),
rect, PaintHelper.SFLeft);
}
