public void DrawInsetCircle(ref Graphics g, ref Rectangle r, Pen p)
{
int i;
Pen p1 = new Pen(MetroDrawingMethods.GetDarkColor(p.Color, 50));
Pen p2 = new Pen(MetroDrawingMethods.GetLightColor(p.Color, 50));
for (i = 0; i <= p.Width; i++)
{
Rectangle r1 = new Rectangle(r.X + i, r.Y + i, r.Width - i * 2, r.Height - i * 2);
g.DrawArc(p2, r1, -45, 180);
g.DrawArc(p1, r1, 135, 180);
}
}
public MetroKnobControl()
{
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.SetStyle(ControlStyles.ResizeRedraw, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
//This call is required by the Windows Form Designer.
InitializeComponent();
this.ImeMode = ImeMode.On;
this.Name = "Knob";
this.Resize += new EventHandler(this.Knob_Resize);
//this.ValueChanged += new ValueChangedEventHandler(this.ValueChanged);
DottedPen = new Pen(MetroDrawingMethods.GetDarkColor(_KnobBorderColor, 40));
DottedPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
DottedPen.DashCap = System.Drawing.Drawing2D.DashCap.Round;
setDimensions();
InitColors();
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
// create LinearGradientBrush for creating knob
bKnob = new System.Drawing.Drawing2D.LinearGradientBrush(rKnob, MetroDrawingMethods.GetLightColor(KnobColor, 55), MetroDrawingMethods.GetDarkColor(KnobColor, 55), LinearGradientMode.ForwardDiagonal);
// create LinearGradientBrush for knobPoint
bKnobPoint = new System.Drawing.Drawing2D.LinearGradientBrush(rKnob, MetroDrawingMethods.GetLightColor(_KnobBorderColor, 55), MetroDrawingMethods.GetDarkColor(_KnobBorderColor, 55), LinearGradientMode.ForwardDiagonal);
// Set background color of Image...
e.Graphics.FillRectangle(new SolidBrush(_KnobBackColor), new Rectangle(0, 0, Width, Height));
//gOffScreen.Clear(this.BackColor);
// Fill knob Background to give knob effect....
gOffScreen.FillEllipse(bKnob, rKnob);
// Set antialias effect on
gOffScreen.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
// Draw border of knob
gOffScreen.DrawEllipse(new Pen(_KnobBorderColor), rKnob);
//if control is focused
if ((this._isFocused))
{
gOffScreen.DrawEllipse(DottedPen, rKnob);
}
// get current position of pointer
Point Arrow = this.getKnobPosition();
// Draw pointer arrow that shows knob position
Rectangle rect = new Rectangle(Arrow.X - 3, Arrow.Y - 3, 6, 6);
DrawInsetCircle(ref gOffScreen, ref rect, new Pen(_KnobBorderColor));
// Draw small and large scale
int i = Minimum;
if ((this._ShowSmallScale))
{
for (i = Minimum; i <= Maximum; i = i + this._SmallChange)
{
gOffScreen.DrawLine(new Pen(this.ForeColor), getMarkerPoint(0, i), getMarkerPoint(_SizeSmallScaleMarker, i));
}
}
if ((this._ShowLargeScale))
{
for (i = Minimum; i <= Maximum; i = i + this._LargeChange)
{
gOffScreen.DrawLine(new Pen(this.ForeColor), getMarkerPoint(0, i), getMarkerPoint(_SizeLargeScaleMarker, i));
}
}
// Drawimage on screen
g.DrawImage(OffScreenImage, 0, 0);
}
