static HSLColourStructure()
{
Empty = new HSLColourStructure
{
IsEmpty = true
};
}
protected virtual void PaintColour(PaintEventArgs e, HSLColourStructure colour, bool includeFocus)
{
PointF location;
location = this.GetColourLocation(colour);
if (!float.IsNaN(location.X) && !float.IsNaN(location.Y))
{
int x;
int y;
x = (int)location.X - _selectionSize / 2;
y = (int)location.Y - _selectionSize / 2;
if (_selectionGlyph == null)
{
e.Graphics.DrawRectangle(Pens.Black, x, y, _selectionSize, _selectionSize);
}
else
{
e.Graphics.DrawImage(_selectionGlyph, x, y);
}
if (this.Focused && includeFocus)
{
ControlPaint.DrawFocusRectangle(e.Graphics, new Rectangle(x - 1, y - 1, _selectionSize + 2, _selectionSize + 2));
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ColourWheelControl"/> class.
/// </summary>
public ColourWheelControl()
{
this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.Selectable | ControlStyles.StandardClick | ControlStyles.StandardDoubleClick, true);
_colour = Color.Black;
_hslColour = new HSLColourStructure(_colour);
_colourStep = 4;
_selectionSize = 10;
_smallChange = 1;
_largeChange = 5;
}
/// <summary>
/// Gets the point within the wheel representing the source color.
/// </summary>
/// <param name="colour">The color.</param>
protected virtual PointF GetColourLocation(HSLColourStructure colour)
{
double angle;
double radius;
angle = colour.H * Math.PI / 180;
radius = _radius * colour.S;
return(this.GetColourLocation(angle, radius));
}
protected virtual void CreateScale()
{
HSLColourStructure colour;
colour = new HSLColourStructure(this.Colour);
colour.L = 0;
this.Colour1 = colour.ToRgbColour();
colour.L = 1;
this.Colour2 = colour.ToRgbColour();
}
/// <summary>
/// Raises the <see cref="ColourSlider.ValueChanged" /> event.
/// </summary>
/// <param name="e">The <see cref="EventArgs" /> instance containing the event data.</param>
protected override void OnValueChanged(EventArgs e)
{
if (!this.LockUpdates)
{
HSLColourStructure colour;
this.LockUpdates = true;
colour = new HSLColourStructure(this.Colour);
colour.L = this.Value / 100D;
_colour = colour.ToRgbColour();
this.OnColourChanged(e);
this.LockUpdates = false;
}
base.OnValueChanged(e);
}
protected virtual void SetColour(Point point)
{
double dx;
double dy;
double angle;
double distance;
double saturation;
Padding padding;
HSLColourStructure newColour;
padding = this.Padding;
dx = Math.Abs(point.X - _centerPoint.X - padding.Left);
dy = Math.Abs(point.Y - _centerPoint.Y - padding.Top);
angle = Math.Atan(dy / dx) / Math.PI * 180;
distance = Math.Pow(Math.Pow(dx, 2) + Math.Pow(dy, 2), 0.5);
saturation = distance / _radius;
if (point.X < _centerPoint.X)
{
angle = 180 - angle;
}
if (point.Y > _centerPoint.Y)
{
angle = 360 - angle;
}
newColour = new HSLColourStructure(angle, saturation, 0.5);
if (_hslColour != newColour)
{
_lockUpdates = true;
this.HSLColour = newColour;
this.Colour = _hslColour.ToRgbColour();
_lockUpdates = false;
}
}
protected void PaintColour(PaintEventArgs e, HSLColourStructure colour)
{
this.PaintColour(e, colour, false);
}