/// <summary>
/// Set position of button inside its rectangle to insure that divisions will fit.
/// </summary>
private void SetDimensions()
{
Font font;
// Rectangle
float x, y, w, h;
x = 0;
y = 0;
w = h = Width;
// Calculate ratio
_drawRatio = w / 150;
if (_drawRatio == 0.0)
{
_drawRatio = 1;
}
if (_showLargeScale)
{
Graphics Gr = this.CreateGraphics();
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 = _scaleTypeface.Size;
if (_scaleTypefaceAutoSize)
{
fSize = (float)(6F * _drawRatio);
if (fSize < 6)
{
fSize = 6;
}
font = new Font(_scaleTypeface.FontFamily, fSize);
}
else
{
fSize = _scaleTypeface.Size;
font = new Font(_scaleTypeface.FontFamily, _scaleTypeface.Size);
}
SizeF strsize = Gr.MeasureString(str, font);
// Graduations outside
_gradLength = 4 * _drawRatio;
if (_drawDivInside)
{
// Graduations inside : remove only 2*8 pixels
//x = y = 8;
x = y = _gradLength;
w = Width - 2 * x;
}
else
{
// remove 2 * size of text and length of graduation
//_gradLength = 4 * _drawRatio;
int strw = (int)strsize.Width;
int strh = (int)strsize.Height;
int max = Math.Max(strw, strh);
x = max;
y = max;
w = (int)(Width - 2 * max - _gradLength);
}
if (w <= 0)
{
w = 1;
}
h = w;
// Rectangle of the rounded knob
this._rKnob = new Rectangle((int)x, (int)y, (int)w, (int)h);
Gr.Dispose();
}
else
{
this._rKnob = new Rectangle(0, 0, Width, Height);
}
// Center of knob
this._pKnob = new Point(_rKnob.X + _rKnob.Width / 2, _rKnob.Y + _rKnob.Height / 2);
// create offscreen image
this._offScreenImage = new Bitmap(this.Width, this.Height);
// create offscreen graphics
this._gOffScreen = Graphics.FromImage(_offScreenImage);
// Depends on retangle dimensions
// create LinearGradientBrush for creating knob
_brushKnob = new LinearGradientBrush(
_rKnob, KryptonKnobUtilities.GetLightColour(_knobBackColour, 55), KryptonKnobUtilities.GetDarkColour(_knobBackColour, 55), LinearGradientMode.ForwardDiagonal);
// create LinearGradientBrush for knobPointer
_brushKnobPointer = new LinearGradientBrush(
_rKnob, KryptonKnobUtilities.GetLightColour(_pointerColour, 55), KryptonKnobUtilities.GetDarkColour(_pointerColour, 55), LinearGradientMode.ForwardDiagonal);
}
/// <summary>
/// Draw the pointer of the knob (a small button inside the main button)
/// </summary>
/// <param name="Gr"></param>
private void DrawPointer(Graphics Gr)
{
try
{
float radius = (float)(_rKnob.Width / 2);
// Draw a line
if (_pointerStyle == KnobPointerStyles.LINE)
{
int l = (int)radius / 2;
int w = l / 4;
Point[] pt = GetKnobLine(Gr, l);
Gr.DrawLine(new Pen(_pointerColour, w), pt[0], pt[1]);
}
else
{
// Draw a circle
int w = 0;
int h = 0;
int l = 0;
string strvalmax = _maximum.ToString();
string strvalmin = _minimum.ToString();
string strval = strvalmax.Length > strvalmin.Length ? strvalmax : strvalmin;
double val = Convert.ToDouble(strval);
String str = String.Format("{0,0:D}", (int)val);
float fSize;
SizeF strsize;
if (_scaleTypefaceAutoSize)
{
// Use font family = _scaleTypeface, but size = automatic
fSize = (float)(6F * _drawRatio);
if (fSize < 6)
{
fSize = 6;
}
strsize = Gr.MeasureString(str, new Font(_scaleTypeface.FontFamily, fSize));
}
else
{
// Use font family = _scaleTypeface, but size = fixed
fSize = _scaleTypeface.Size;
strsize = Gr.MeasureString(str, _scaleTypeface);
}
int strw = (int)strsize.Width;
int strh = (int)strsize.Height;
w = Math.Max(strw, strh);
// radius of small circle
l = (int)radius - w / 2;
h = w;
Point Arrow = this.GetKnobPosition(l - 2); // Remove 2 pixels to offset the small circle inside the knob
// Draw pointer arrow that shows knob position
Rectangle rPointer = new Rectangle(Arrow.X - w / 2, Arrow.Y - w / 2, w, h);
//KryptonKnobUtilities.DrawInsetCircle(ref Gr, rPointer, new Pen(_pointerColour));
KryptonKnobUtilities.DrawInsetCircle(ref Gr, rPointer, new Pen(KryptonKnobUtilities.GetLightColour(_pointerColour, 55)));
Gr.FillEllipse(_brushKnobPointer, rPointer);
}
}
catch (Exception ex)
{
Console.Write(ex.Message);
}
}
