protected override void OnPaint(PaintEventArgs e)
{
Rectangle rect = ClientRectangle;
if (_needToRecrateInternalImage)
{
_saturationBrightnessImage = new Bitmap(rect.Width, rect.Height, e.Graphics);
_needToRecrateInternalImage = false;
Graphics gr = Graphics.FromImage(_saturationBrightnessImage);
Color color = ColorUtils.HsbToRgb(_hue, 100.0, 100.0);
double r = ((double)(255 - color.R)) / rect.Width;
double g = ((double)(255 - color.G)) / rect.Width;
double b = ((double)(255 - color.B)) / rect.Width;
double num4 = 255;
double num5 = 255;
double num6 = 255;
for (int num7 = rect.Left; num7 <= rect.Right; num7++)
{
using (LinearGradientBrush brush1 = new LinearGradientBrush(new Rectangle(num7, rect.Top, 1, rect.Height + 1), Color.FromArgb((int)Math.Round(num4), (int)Math.Round(num5), (int)Math.Round(num6)), Color.FromArgb(0, 0, 0), 90f, false))
{
gr.FillRectangle(brush1, new Rectangle(num7, rect.Top, 1, rect.Height + 1));
}
num4 -= r;
num5 -= g;
num6 -= b;
}
gr.Dispose();
}
e.Graphics.DrawImage(_saturationBrightnessImage, 0, 0);
// Draw the color tracker
int x = (int)Math.Round(_saturation / 100.0 * rect.Width);
int y = rect.Height - (int)Math.Round(_brightness / 100.0 * rect.Height);
Rectangle circleRect = new Rectangle(x - 5, y - 5, 10, 10);
Pen pen = new Pen(Color.White);
e.Graphics.DrawEllipse(pen, circleRect);
pen.Dispose();
circleRect.Inflate(1, 1);
pen = new Pen(Color.Black);
e.Graphics.DrawEllipse(pen, circleRect);
pen.Dispose();
}
protected void UpdateColor(Point mousePos)
{
Rectangle clientRect = ClientRectangle;
if (mousePos.X < 0)
{
mousePos.X = 0;
}
if (mousePos.Y < 0)
{
mousePos.Y = 0;
}
if (mousePos.X > clientRect.Right - 1)
{
mousePos.X = clientRect.Right - 1;
}
if (mousePos.Y > clientRect.Bottom - 1)
{
mousePos.Y = clientRect.Bottom - 1;
}
Rectangle rect = ClientRectangle;
_saturation = mousePos.X * 100.0 / rect.Width;
_brightness = (rect.Height - mousePos.Y) * 100.0 / rect.Height;
Color color = Color.FromArgb(_color.A, ColorUtils.HsbToRgb(_hue, _saturation, _brightness));
Invalidate();
if (color != _color)
{
_color = color;
if (ValueChanged != null)
{
ValueChanged(this, EventArgs.Empty);
}
}
}
