private void DrawRuler(PaintEventArgs e, bool highlighted)
{
Pen pen;
Brush cursorBrush;
Brush textBrush;
StringFormat textFormat = new StringFormat();
int maxPixel;
Color cursorColor;
if (highlighted)
{
e.Graphics.Clear(SystemColors.Highlight);
pen = SystemPens.HighlightText;
textBrush = SystemBrushes.HighlightText;
cursorColor = SystemColors.Window;
}
else
{
e.Graphics.Clear(SystemColors.Window);
pen = SystemPens.WindowText;
textBrush = SystemBrushes.WindowText;
cursorColor = SystemColors.Highlight;
}
cursorColor = Color.FromArgb(128, cursorColor);
cursorBrush = new SolidBrush(cursorColor);
if (orientation == Orientation.Horizontal)
{
maxPixel = ScaleFactor.UnscaleScalar(ClientRectangle.Width);
textFormat.Alignment = StringAlignment.Near;
textFormat.LineAlignment = StringAlignment.Far;
}
else // if (orientation == Orientation.Vertical)
{
maxPixel = ScaleFactor.UnscaleScalar(ClientRectangle.Height);
textFormat.Alignment = StringAlignment.Near;
textFormat.LineAlignment = StringAlignment.Near;
textFormat.FormatFlags |= StringFormatFlags.DirectionVertical;
}
float majorSkip = 1;
int majorSkipPower = 0;
float majorDivisionLength = (float)dpu;
float majorDivisionPixels = (float)ScaleFactor.ScaleScalar(majorDivisionLength);
int[] subdivs = GetSubdivs(measurementUnit);
float offsetPixels = ScaleFactor.ScaleScalar((float)offset);
int startMajor = (int)(offset / majorDivisionLength) - 1;
int endMajor = (int)((offset + maxPixel) / majorDivisionLength) + 1;
if (orientation == Orientation.Horizontal)
{
// draw Value
if (!highlighted)
{
PointF pt = scaleFactor.ScalePointJustX(new PointF(ClientRectangle.Left + Value - Offset, ClientRectangle.Top));
SizeF size = new SizeF(Math.Max(1, scaleFactor.ScaleScalar(1.0f)), ClientRectangle.Height);
pt.X -= 0.5f;
CompositingMode oldCM = e.Graphics.CompositingMode;
e.Graphics.CompositingMode = CompositingMode.SourceOver;
e.Graphics.FillRectangle(cursorBrush, new RectangleF(pt, size));
e.Graphics.CompositingMode = oldCM;
}
// draw border
e.Graphics.DrawLine(SystemPens.WindowText, new Point(ClientRectangle.Left, ClientRectangle.Bottom - 1),
new Point(ClientRectangle.Right - 1, ClientRectangle.Bottom - 1));
}
else if (orientation == Orientation.Vertical)
{
// draw Value
if (!highlighted)
{
PointF pt = scaleFactor.ScalePointJustY(new PointF(ClientRectangle.Left, ClientRectangle.Top + Value - Offset));
SizeF size = new SizeF(ClientRectangle.Width, Math.Max(1, scaleFactor.ScaleScalar(1.0f)));
pt.Y -= 0.5f;
CompositingMode oldCM = e.Graphics.CompositingMode;
e.Graphics.CompositingMode = CompositingMode.SourceOver;
e.Graphics.FillRectangle(cursorBrush, new RectangleF(pt, size));
e.Graphics.CompositingMode = oldCM;
}
// draw border
e.Graphics.DrawLine(SystemPens.WindowText, new Point(ClientRectangle.Right - 1, ClientRectangle.Top),
new Point(ClientRectangle.Right - 1, ClientRectangle.Bottom - 1));
}
while (majorDivisionPixels * majorSkip < 60)
{
majorSkip *= majorDivisors[majorSkipPower % majorDivisors.Length];
++majorSkipPower;
}
startMajor = (int)(majorSkip * Math.Floor(startMajor / (double)majorSkip));
for (int major = startMajor; major <= endMajor; major += (int)majorSkip)
{
float majorMarkPos = (major * majorDivisionPixels) - offsetPixels;
string majorText = (major).ToString();
if (orientation == Orientation.Horizontal)
{
SubdivideX(e.Graphics, pen, ClientRectangle.Left + majorMarkPos, majorDivisionPixels * majorSkip, -majorSkipPower, ClientRectangle.Top, ClientRectangle.Height, subdivs);
e.Graphics.DrawString(majorText, Font, textBrush, new PointF(ClientRectangle.Left + majorMarkPos, ClientRectangle.Bottom), textFormat);
}
else // if (orientation == Orientation.Vertical)
{
SubdivideY(e.Graphics, pen, ClientRectangle.Top + majorMarkPos, majorDivisionPixels * majorSkip, -majorSkipPower, ClientRectangle.Left, ClientRectangle.Width, subdivs);
e.Graphics.DrawString(majorText, Font, textBrush, new PointF(ClientRectangle.Left, ClientRectangle.Top + majorMarkPos), textFormat);
}
}
textFormat.Dispose();
}
