/// <summary>
/// Draws the content of the control filling in all color values with the provided Luminance or Brightness value.
/// </summary>
private void Draw_Style_Luminance(Gdk.Window win)
{
//hack: use CAIRO instead of Systme.Drawing bug
Cairo.Context context = Gdk.CairoHelper.Create(win);
GraphUtil.HSL hsl_start = new GraphUtil.HSL();
GraphUtil.HSL hsl_end = new GraphUtil.HSL();
hsl_start.L = m_hsl.L;
hsl_end.L = m_hsl.L;
hsl_start.S = 1.0;
hsl_end.S = 0.0;
for (int i = 0; i < this.Allocation.Width - 4; i++) // For each vertical line in the control:
{
hsl_start.H = (double)i / (this.Allocation.Width - 4); // Calculate Hue at this line (Saturation and Luminance are constant)
hsl_end.H = hsl_start.H;
Cairo.LinearGradient gradient = new Cairo.LinearGradient(2, 2, 1, this.Allocation.Height - 4);
gradient.AddColorStop(0, CairoUtil.ColorFromRgb(GraphUtil.HSL_to_RGB(hsl_start)));
gradient.AddColorStop(1, CairoUtil.ColorFromRgb(GraphUtil.HSL_to_RGB(hsl_end)));
context.Rectangle(i + 2, 2, 1, this.Allocation.Height - 4);
context.Pattern = gradient;
context.Fill();
}
context.Stroke();
((IDisposable)context).Dispose();
}
/// <summary>
/// Resets the controls color (both HSL and RGB variables) based on the current slider position
/// </summary>
private void ResetHSLRGB()
{
switch (m_eDrawStyle)
{
case eDrawStyle.Hue:
m_hsl.H = 1.0 - (double)m_iMarker_Start_Y / (this.Allocation.Height - 9);
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
break;
case eDrawStyle.Saturation:
m_hsl.S = 1.0 - (double)m_iMarker_Start_Y / (this.Allocation.Height - 9);
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
break;
case eDrawStyle.Brightness:
m_hsl.L = 1.0 - (double)m_iMarker_Start_Y / (this.Allocation.Height - 9);
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
break;
case eDrawStyle.Red:
m_rgb = Color.FromArgb(255 - Round(255 * (double)m_iMarker_Start_Y / (this.Allocation.Height - 9)), m_rgb.G, m_rgb.B);
m_hsl = GraphUtil.RGB_to_HSL(m_rgb);
break;
case eDrawStyle.Green:
m_rgb = Color.FromArgb(m_rgb.R, 255 - Round(255 * (double)m_iMarker_Start_Y / (this.Allocation.Height - 9)), m_rgb.B);
m_hsl = GraphUtil.RGB_to_HSL(m_rgb);
break;
case eDrawStyle.Blue:
m_rgb = Color.FromArgb(m_rgb.R, m_rgb.G, 255 - Round(255 * (double)m_iMarker_Start_Y / (this.Allocation.Height - 9)));
m_hsl = GraphUtil.RGB_to_HSL(m_rgb);
break;
}
}
public VerticalColorSlider()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent();
// Initialize Colors
m_hsl = new GraphUtil.HSL();
m_hsl.H = 1.0;
m_hsl.S = 1.0;
m_hsl.L = 1.0;
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
m_eDrawStyle = eDrawStyle.Hue;
}
public ColorPanel()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent();
// Initialize Colors
m_hsl = new GraphUtil.HSL();
m_hsl.H = 1.0;
m_hsl.S = 1.0;
m_hsl.L = 1.0;
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
m_eDrawStyle = eDrawStyle.Hue;
this.DoubleBuffered = false;
}
/// <summary>
/// Fills in the content of the control showing all values of Luminance (0 to 100%) for the given
/// Hue and Saturation.
/// </summary>
private void Draw_Style_Luminance(Gdk.Window g)
{
GraphUtil.HSL _hsl = new GraphUtil.HSL();
_hsl.H = m_hsl.H; // Use the H and S values of the current color (m_hsl)
_hsl.S = m_hsl.S;
for (int i = 0; i < this.Allocation.Height - 8; i++) // i represents the current line of pixels we want to draw horizontally
{
_hsl.L = 1.0 - (double)i / (this.Allocation.Height - 8); // L (Luminance) is based on the current vertical position
// Get the Color for this line
Color c = GraphUtil.HSL_to_RGB(_hsl);
Gdk.GC gc = new Gdk.GC(g);
gc.RgbFgColor = GraphUtil.gdkColorFromWinForms(c);
g.DrawLine(gc, 11, i + 4, this.Allocation.Width - 11, i + 4); // Draw the line and loop back for next line
}
}
// The following functions do the real work of the control, drawing the primary content (the area between the slider)
//
/// <summary>
/// Fills in the content of the control showing all values of Hue (from 0 to 360)
/// </summary>
private void Draw_Style_Hue(Gdk.Window g)
{
GraphUtil.HSL _hsl = new GraphUtil.HSL();
_hsl.S = 1.0; // S and L will both be at 100% for this DrawStyle
_hsl.L = 1.0;
for (int i = 0; i < this.Allocation.Height - 8; i++) // i represents the current line of pixels we want to draw horizontally
{
_hsl.H = 1.0 - (double)i / (this.Allocation.Height - 8); // H (hue) is based on the current vertical position
Color c = GraphUtil.HSL_to_RGB(_hsl);
Gdk.GC gc = new Gdk.GC(g);
gc.RgbFgColor = GraphUtil.gdkColorFromWinForms(c);
g.DrawLine(gc, 11, i + 4, this.Allocation.Width - 11, i + 4); // Draw the line and loop back for next line
}
}
/// <summary>
/// Resets the controls color (both HSL and RGB variables) based on the current marker position
/// </summary>
private void ResetHSLRGB( )
{
int red, green, blue;
switch (m_eDrawStyle)
{
case eDrawStyle.Hue:
m_hsl.S = (double)m_iMarker_X / (this.Allocation.Width - 4);
m_hsl.L = 1.0 - (double)m_iMarker_Y / (this.Allocation.Height - 4);
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
break;
case eDrawStyle.Saturation:
m_hsl.H = (double)m_iMarker_X / (this.Allocation.Width - 4);
m_hsl.L = 1.0 - (double)m_iMarker_Y / (this.Allocation.Height - 4);
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
break;
case eDrawStyle.Brightness:
m_hsl.H = (double)m_iMarker_X / (this.Allocation.Width - 4);
m_hsl.S = 1.0 - (double)m_iMarker_Y / (this.Allocation.Height - 4);
m_rgb = GraphUtil.HSL_to_RGB(m_hsl);
break;
case eDrawStyle.Red:
blue = Round(255 * (double)m_iMarker_X / (this.Allocation.Width - 4));
green = Round(255 * (1.0 - (double)m_iMarker_Y / (this.Allocation.Height - 4)));
m_rgb = Color.FromArgb(m_rgb.R, green, blue);
m_hsl = GraphUtil.RGB_to_HSL(m_rgb);
break;
case eDrawStyle.Green:
blue = Round(255 * (double)m_iMarker_X / (this.Allocation.Width - 4));
red = Round(255 * (1.0 - (double)m_iMarker_Y / (this.Allocation.Height - 4)));
m_rgb = Color.FromArgb(red, m_rgb.G, blue);
m_hsl = GraphUtil.RGB_to_HSL(m_rgb);
break;
case eDrawStyle.Blue:
red = Round(255 * (double)m_iMarker_X / (this.Allocation.Width - 4));
green = Round(255 * (1.0 - (double)m_iMarker_Y / (this.Allocation.Height - 4)));
m_rgb = Color.FromArgb(red, green, m_rgb.B);
m_hsl = GraphUtil.RGB_to_HSL(m_rgb);
break;
}
}
/// <summary>
/// Draws the content of the control filling in all color values with the provided Hue value.
/// </summary>
private void Draw_Style_Hue(Gdk.Window win)
{
Graphics g = Gtk.DotNet.Graphics.FromDrawable(win);
GraphUtil.HSL hsl_start = new GraphUtil.HSL();
GraphUtil.HSL hsl_end = new GraphUtil.HSL();
hsl_start.H = m_hsl.H;
hsl_end.H = m_hsl.H;
hsl_start.S = 0.0;
hsl_end.S = 1.0;
for (int i = 0; i < this.Allocation.Height - 4; i++) // For each horizontal line in the control:
{
hsl_start.L = 1.0 - (double)i / (this.Allocation.Height - 4); // Calculate luminance at this line (Hue and Saturation are constant)
hsl_end.L = hsl_start.L;
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(2, 2, this.Allocation.Width - 4, 1), GraphUtil.HSL_to_RGB(hsl_start), GraphUtil.HSL_to_RGB(hsl_end), 0, false);
g.FillRectangle(br, new Rectangle(2, i + 2, this.Allocation.Width - 4, 1));
}
g.Dispose();
}
/// <summary>
/// Redraws only the content over the marker
/// </summary>
private void ClearMarker(Gdk.Window win)
{
// Determine the area that needs to be redrawn
Graphics g = Gtk.DotNet.Graphics.FromDrawable(win);
int start_x, start_y, end_x, end_y;
int red = 0; int green = 0; int blue = 0;
GraphUtil.HSL hsl_start = new GraphUtil.HSL();
GraphUtil.HSL hsl_end = new GraphUtil.HSL();
// Find the markers corners
start_x = m_iMarker_X - 5;
start_y = m_iMarker_Y - 5;
end_x = m_iMarker_X + 5;
end_y = m_iMarker_Y + 5;
// Adjust the area if part of it hangs outside the content area
if (start_x < 0)
{
start_x = 0;
}
if (start_y < 0)
{
start_y = 0;
}
if (end_x > this.Allocation.Width - 4)
{
end_x = this.Allocation.Width - 4;
}
if (end_y > this.Allocation.Height - 4)
{
end_y = this.Allocation.Height - 4;
}
// Redraw the content based on the current draw style:
// The code get's a little messy from here
switch (m_eDrawStyle)
{
// S=0,S=1,S=2,S=3.....S=100
// L=100
// L=99
// L=98 Drawstyle
// L=97 Hue
// ...
// L=0
case eDrawStyle.Hue:
hsl_start.H = m_hsl.H; hsl_end.H = m_hsl.H; // Hue is constant
hsl_start.S = (double)start_x / (this.Allocation.Width - 4); // Because we're drawing horizontal lines, s will not change
hsl_end.S = (double)end_x / (this.Allocation.Width - 4); // from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
hsl_start.L = 1.0 - (double)i / (this.Allocation.Height - 4); // Brightness (L) WILL change for each horizontal
hsl_end.L = hsl_start.L; // line drawn
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1), GraphUtil.HSL_to_RGB(hsl_start), GraphUtil.HSL_to_RGB(hsl_end), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
// H=0,H=1,H=2,H=3.....H=360
// L=100
// L=99
// L=98 Drawstyle
// L=97 Saturation
// ...
// L=0
case eDrawStyle.Saturation:
hsl_start.S = m_hsl.S; hsl_end.S = m_hsl.S; // Saturation is constant
hsl_start.L = 1.0 - (double)start_y / (this.Allocation.Height - 4); // Because we're drawing vertical lines, L will
hsl_end.L = 1.0 - (double)end_y / (this.Allocation.Height - 4); // not change from line to line
for (int i = start_x; i <= end_x; i++) // For each vertical line:
{
hsl_start.H = (double)i / (this.Allocation.Width - 4); // Hue (H) WILL change for each vertical
hsl_end.H = hsl_start.H; // line drawn
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(i + 2, start_y + 1, 1, end_y - start_y + 2), GraphUtil.HSL_to_RGB(hsl_start), GraphUtil.HSL_to_RGB(hsl_end), 90, false);
g.FillRectangle(br, new Rectangle(i + 2, start_y + 2, 1, end_y - start_y + 1));
}
break;
// H=0,H=1,H=2,H=3.....H=360
// S=100
// S=99
// S=98 Drawstyle
// S=97 Brightness
// ...
// S=0
case eDrawStyle.Brightness:
hsl_start.L = m_hsl.L; hsl_end.L = m_hsl.L; // Luminance is constant
hsl_start.S = 1.0 - (double)start_y / (this.Allocation.Height - 4); // Because we're drawing vertical lines, S will
hsl_end.S = 1.0 - (double)end_y / (this.Allocation.Height - 4); // not change from line to line
for (int i = start_x; i <= end_x; i++) // For each vertical line:
{
hsl_start.H = (double)i / (this.Allocation.Width - 4); // Hue (H) WILL change for each vertical
hsl_end.H = hsl_start.H; // line drawn
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(i + 2, start_y + 1, 1, end_y - start_y + 2), GraphUtil.HSL_to_RGB(hsl_start), GraphUtil.HSL_to_RGB(hsl_end), 90, false);
g.FillRectangle(br, new Rectangle(i + 2, start_y + 2, 1, end_y - start_y + 1));
}
break;
// B=0,B=1,B=2,B=3.....B=100
// G=100
// G=99
// G=98 Drawstyle
// G=97 Red
// ...
// G=0
case eDrawStyle.Red:
red = m_rgb.R; // Red is constant
int start_b = Round(255 * (double)start_x / (this.Allocation.Width - 4)); // Because we're drawing horizontal lines, B
int end_b = Round(255 * (double)end_x / (this.Allocation.Width - 4)); // will not change from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
green = Round(255 - (255 * (double)i / (this.Allocation.Height - 4))); // green WILL change for each horizontal line drawn
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1), Color.FromArgb(red, green, start_b), Color.FromArgb(red, green, end_b), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
// B=0,B=1,B=2,B=3.....B=100
// R=100
// R=99
// R=98 Drawstyle
// R=97 Green
// ...
// R=0
case eDrawStyle.Green:
green = m_rgb.G;; // Green is constant
int start_b2 = Round(255 * (double)start_x / (this.Allocation.Width - 4)); // Because we're drawing horizontal lines, B
int end_b2 = Round(255 * (double)end_x / (this.Allocation.Width - 4)); // will not change from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
red = Round(255 - (255 * (double)i / (this.Allocation.Height - 4))); // red WILL change for each horizontal line drawn
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1), Color.FromArgb(red, green, start_b2), Color.FromArgb(red, green, end_b2), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
// R=0,R=1,R=2,R=3.....R=100
// G=100
// G=99
// G=98 Drawstyle
// G=97 Blue
// ...
// G=0
case eDrawStyle.Blue:
blue = m_rgb.B;; // Blue is constant
int start_r = Round(255 * (double)start_x / (this.Allocation.Width - 4)); // Because we're drawing horizontal lines, R
int end_r = Round(255 * (double)end_x / (this.Allocation.Width - 4)); // will not change from line to line
for (int i = start_y; i <= end_y; i++) // For each horizontal line:
{
green = Round(255 - (255 * (double)i / (this.Allocation.Height - 4))); // green WILL change for each horizontal line drawn
LinearGradientBrush br = new LinearGradientBrush(new Rectangle(start_x + 1, i + 2, end_x - start_x + 1, 1), Color.FromArgb(start_r, green, blue), Color.FromArgb(end_r, green, blue), 0, false);
g.FillRectangle(br, new Rectangle(start_x + 2, i + 2, end_x - start_x + 1, 1));
}
break;
}
g.Dispose();
}