/// <summary>
/// gets knob position that is to be drawn on control minus a small amount in order that the knob position stay inside the circle.
/// </summary>
/// <returns>Point that describes current knob position</returns>
private Point GetKnobPosition(int l)
{
float cx = _pKnob.X;
float cy = _pKnob.Y;
// FAB: 21/08/18
float degree = _deltaAngle * (this.Value - _minimum) / (_maximum - _minimum);
degree = KryptonKnobUtilities.GetRadian(degree + _startAngle);
Point Pos = new Point(0, 0)
{
X = (int)(cx + l * Math.Cos(degree)),
Y = (int)(cy + l * Math.Sin(degree))
};
return(Pos);
}
/// <summary>
/// Draw graduations
/// </summary>
/// <param name="Gr"></param>
/// <param name="rc">Knob rectangle</param>
/// <returns></returns>
private bool DrawDivisions(Graphics Gr, RectangleF rc)
{
if (this == null)
{
return(false);
}
float cx = _pKnob.X;
float cy = _pKnob.Y;
float w = rc.Width;
float h = rc.Height;
float tx;
float ty;
float incr = KryptonKnobUtilities.GetRadian((_endAngle - _startAngle) / ((_scaleDivisions - 1) * (_scaleSubDivisions + 1)));
float currentAngle = KryptonKnobUtilities.GetRadian(_startAngle);
float radius = (float)(rc.Width / 2);
float rulerValue = (float)_minimum;
Font font;
Pen penL = new Pen(_scaleColour, (2 * _drawRatio));
Pen penS = new Pen(_scaleColour, (1 * _drawRatio));
SolidBrush br = new SolidBrush(_scaleColour);
PointF ptStart = new PointF(0, 0);
PointF ptEnd = new PointF(0, 0);
int n = 0;
if (_showLargeScale)
{
// Size of maxi string
string strvalmax = _maximum.ToString();
string strvalmin = _minimum.ToString();
string strval = strvalmax.Length > strvalmin.Length ? strvalmax : strvalmin;
double val = Convert.ToDouble(strval);
//double val = _maximum;
String str = String.Format("{0,0:D}", (int)val);
float fSize;
SizeF strsize;
if (_scaleTypefaceAutoSize)
{
fSize = (float)(6F * _drawRatio);
if (fSize < 6)
{
fSize = 6;
}
}
else
{
fSize = _scaleTypeface.Size;
}
font = new Font(_scaleTypeface.FontFamily, fSize);
strsize = Gr.MeasureString(str, font);
int strw = (int)strsize.Width;
int strh = (int)strsize.Height;
int wmax = Math.Max(strw, strh);
float l = 0;
_gradLength = 2 * _drawRatio;
for (; n < _scaleDivisions; n++)
{
// draw divisions
ptStart.X = (float)(cx + (radius) * Math.Cos(currentAngle));
ptStart.Y = (float)(cy + (radius) * Math.Sin(currentAngle));
ptEnd.X = (float)(cx + (radius + _gradLength) * Math.Cos(currentAngle));
ptEnd.Y = (float)(cy + (radius + _gradLength) * Math.Sin(currentAngle));
Gr.DrawLine(penL, ptStart, ptEnd);
//Draw graduation values
val = Math.Round(rulerValue);
str = String.Format("{0,0:D}", (int)val);
// If autosize
if (_scaleTypefaceAutoSize)
{
strsize = Gr.MeasureString(str, new Font(_scaleTypeface.FontFamily, fSize));
}
else
{
strsize = Gr.MeasureString(str, new Font(_scaleTypeface.FontFamily, _scaleTypeface.Size));
}
if (_drawDivInside)
{
// graduations values inside the knob
l = (int)radius - (wmax / 2) - 2;
tx = (float)(cx + l * Math.Cos(currentAngle));
ty = (float)(cy + l * Math.Sin(currentAngle));
}
else
{
// graduation values outside the knob
//l = (Width / 2) - (wmax / 2) ;
l = radius + _gradLength + wmax / 2;
tx = (float)(cx + l * Math.Cos(currentAngle));
ty = (float)(cy + l * Math.Sin(currentAngle));
}
Gr.DrawString(str,
font,
br,
tx - (float)(strsize.Width * 0.5),
ty - (float)(strsize.Height * 0.5));
rulerValue += (float)((_maximum - _minimum) / (_scaleDivisions - 1));
if (n == _scaleDivisions - 1)
{
break;
}
// Subdivisions
#region SubDivisions
if (_scaleDivisions <= 0)
{
currentAngle += incr;
}
else
{
for (int j = 0; j <= _scaleSubDivisions; j++)
{
currentAngle += incr;
// if user want to display small graduations
if (_showSmallScale)
{
ptStart.X = (float)(cx + radius * Math.Cos(currentAngle));
ptStart.Y = (float)(cy + radius * Math.Sin(currentAngle));
ptEnd.X = (float)(cx + (radius + _gradLength / 2) * Math.Cos(currentAngle));
ptEnd.Y = (float)(cy + (radius + _gradLength / 2) * Math.Sin(currentAngle));
Gr.DrawLine(penS, ptStart, ptEnd);
}
}
}
#endregion
}
font.Dispose();
}
return(true);
}
/// <summary>
/// return 2 points of a line starting from the center of the knob to the periphery
/// </summary>
/// <param name="l"></param>
/// <returns></returns>
private Point[] GetKnobLine(Graphics Gr, int l)
{
Point[] pret = new Point[2];
float cx = _pKnob.X;
float cy = _pKnob.Y;
float radius = (float)(_rKnob.Width / 2);
// FAB: 21/08/18
float degree = _deltaAngle * (this.Value - _minimum) / (_maximum - _minimum);
degree = KryptonKnobUtilities.GetRadian(degree + _startAngle);
double val = _maximum;
String str = String.Format("{0,0:D}", (int)val);
float fSize;
SizeF strsize;
if (!_scaleTypefaceAutoSize)
{
fSize = _scaleTypeface.Size;
strsize = Gr.MeasureString(str, _scaleTypeface);
}
else
{
fSize = (float)(6F * _drawRatio);
if (fSize < 6)
{
fSize = 6;
}
_knobTypeface = new Font(_scaleTypeface.FontFamily, fSize);
strsize = Gr.MeasureString(str, _knobTypeface);
}
int strw = (int)strsize.Width;
int strh = (int)strsize.Height;
int w = Math.Max(strw, strh);
Point Pos = new Point(0, 0);
if (_drawDivInside)
{
// Center (from)
Pos.X = (int)(cx + (radius / 10) * Math.Cos(degree));
Pos.Y = (int)(cy + (radius / 10) * Math.Sin(degree));
pret[0] = new Point(Pos.X, Pos.Y);
// External (to)
Pos.X = (int)(cx + (radius - w) * Math.Cos(degree));
Pos.Y = (int)(cy + (radius - w) * Math.Sin(degree));
pret[1] = new Point(Pos.X, Pos.Y);
}
else
{
// Internal (from)
Pos.X = (int)(cx + (radius - _drawRatio * 10 - l) * Math.Cos(degree));
Pos.Y = (int)(cy + (radius - _drawRatio * 10 - l) * Math.Sin(degree));
pret[0] = new Point(Pos.X, Pos.Y);
// External (to)
Pos.X = (int)(cx + (radius - 4) * Math.Cos(degree));
Pos.Y = (int)(cy + (radius - 4) * Math.Sin(degree));
pret[1] = new Point(Pos.X, Pos.Y);
}
return(pret);
}