/// <summary>
/// draws the ruler
/// </summary>
private void DrawRulerUnits(PaintEventArgs e)
{
int unit = 1, //starting unit count
index = 0; //subdivision count
float unitwidth = _zoom.Scale((float)unit);
if (unitwidth == 0f)
{
return; //error
}
for (; unitwidth <= 60f && index < 1000; index++)
{
unitwidth *= multipliers[index % multipliers.Length];
unit = (int)(unit * multipliers[index % multipliers.Length]);
}
//start one unit off the control
int startunit = -(_zoom.Unscale(_offset) / unit) * unit - unit;
using (StringFormat fmt = new StringFormat(StringFormatFlags.NoWrap))
{
fmt.LineAlignment = StringAlignment.Center;
fmt.Alignment = StringAlignment.Near;
//draw horizontal
if (_orientation == Orientation.Horizontal)
{
for (float x = _zoom.Scale((float)startunit) + (float)_offset;
x < this.Width; x += unitwidth, startunit += unit)
{
DrawXLines(e.Graphics, x, unitwidth, this.Height - 1, index + 1);
e.Graphics.DrawString(startunit.ToString(), this.Font, Brushes.Black,
new RectangleF(x, 0f, 60f, this.Height / 2), fmt);
}
}
//draw vertical
else
{
fmt.FormatFlags |= StringFormatFlags.DirectionVertical;
for (float y = _zoom.Scale((float)startunit) + (float)_offset;
y < this.Height; y += unitwidth, startunit += unit)
{
DrawYLines(e.Graphics, y, unitwidth, this.Width - 1, index + 1);
e.Graphics.DrawString((-startunit).ToString(), this.Font, Brushes.Black,
new RectangleF(0f, y, this.Width / 2, 60f), fmt);
}
}
}
using (SolidBrush brs = new SolidBrush(Color.FromArgb(127, 0, 0, 0)))
{
Rectangle rct = GetMarkerBounds(_value, _length);
e.Graphics.FillRectangle(brs, rct);
rct.Width--; rct.Height--;
if (rct.Width > 1 && rct.Height > 1)
{
e.Graphics.DrawRectangle(Pens.White, rct);
}
}
}
