private void PaintCompass()
{
compass?.Dispose(); // ensure we are clean
compass = null;
pixelsperdegree = (double)this.Width / (double)WidthDegrees;
int bitmapwidth = (int)(360 * pixelsperdegree); // size of bitmap
int bitmapheight = Height * CompassHeightPercentage / 100;
//System.Diagnostics.Debug.WriteLine("Compass width " + this.Width + " deg width " + WidthDegrees + " pix/deg " + pixelsperdegree);
if (!DesignMode) // for some reason, FromImage craps it out
{
compass = new Bitmap(bitmapwidth, bitmapheight);
using (Graphics g = Graphics.FromImage(compass))
{
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
if (!BackColor.IsFullyTransparent())
{
using (Brush b = new SolidBrush(BackColor))
g.FillRectangle(b, new Rectangle(0, 0, compass.Width, compass.Height));
textsmoothingmode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
}
else
{
textsmoothingmode = System.Drawing.Drawing2D.SmoothingMode.None;
}
int yline = 0;
SizeF sz = g.MeasureString("360", Font);
fontline = bitmapheight - (int)(sz.Height + 1);
int bigtickdepth = bitmapheight * TickHeightPercentage / 100;
int smalltickdepth = bigtickdepth / 2;
int stmajor = stencilmajortickat;
int stminor = stencilminortickat;
if (autosetstencilticks)
{
double minmajorticks = sz.Width / pixelsperdegree;
// System.Diagnostics.Debug.WriteLine("Major min ticks at {0} = {1}", sz.Width, minmajorticks);
if (minmajorticks >= 40)
{
stmajor = 80; stminor = 20;
}
else if (minmajorticks >= 20)
{
stmajor = 40; stminor = 10;
}
else if (minmajorticks >= 10)
{
stmajor = 20; stminor = 5;
}
else
{
stmajor = 10; stminor = 2;
}
}
Color sc = Enabled ? StencilColor : StencilColor.Multiply(0.5F);
Pen p1 = new Pen(sc, 1);
Pen p2 = new Pen(sc, 2);
Brush textb = new SolidBrush(Enabled ? this.ForeColor : this.ForeColor.Multiply(0.5F));
var fmt = ControlHelpersStaticFunc.StringFormatFromContentAlignment(ContentAlignment.MiddleCenter);
for (int d = pixelstart; d < 360 + pixelstart; d++)
{
int x = (int)((d - pixelstart) * pixelsperdegree);
bool majortick = d % stmajor == 0;
bool minortick = (d % stminor == 0) && !majortick;
if (majortick)
{
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
g.DrawLine(p2, new Point(x, yline), new Point(x, yline + bigtickdepth));
g.SmoothingMode = textsmoothingmode;
g.DrawString(ToVisual(d).ToStringInvariant(), this.Font, textb, new Rectangle(x - 30, fontline, 60, compass.Height - fontline), fmt);
//DEBUG g.DrawLine(p1, x - sz.Width / 2, fontline, x + sz.Width / 2, fontline);
}
if (minortick)
{
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;
g.DrawLine(p1, new Point(x, yline), new Point(x, yline + smalltickdepth));
}
}
p1.Dispose();
p2.Dispose();
textb.Dispose();
fmt.Dispose();
}
}
else
{ // FromImage above crashes the designer..
emergencydesignlabel = new Label();
emergencydesignlabel.Location = new Point(10, 10);
emergencydesignlabel.AutoSize = true;
emergencydesignlabel.Text = "Compass.. FromImage crashes designer";
this.BackColor = Color.LightBlue;
Controls.Add(emergencydesignlabel);
}
}
