/// <summary>
/// This method creates a VBO for the JND Ellipses for the selected Color with the values for McAdams Ellipses (0.055f)
///
/// The method first points to several directions with aequidistance angle and creates a line with points
/// the points will taken to compute jnd until threshold is reached and breaks to take the next line
/// </summary>
/// <param name="color">the selected Color</param>
/// <returns>returns a VBO with the Ellipse value</returns>
/// <author>Markus Strobel, Justine Smyzek</author>
private VBO createJNDEllipse(Yxy color)
{
int lines = 36;
double degreeStep = 360d / lines;
List<Vector2>[] linesArray = new List<Vector2>[lines];
// generate lines to check
for (int i = 0; i < lines; i++)
{
List<Vector2> linePoints = new List<Vector2>();
double xOffSet = 0d;
double yOffSet = 0d;
// generate all vertices for each line
for (double radius = 0.0001d; radius < 0.1d; radius += 0.0001d)
{
xOffSet = radius * Math.Cos((i * degreeStep) * Math.PI / 180d);
yOffSet = radius * Math.Sin((i * degreeStep) * Math.PI / 180d);
linePoints.Add(new Vector2((float) (color.x + xOffSet), (float) (color.y + yOffSet)));
}
linesArray[i] = linePoints;
}
float jnd = 0.0055f; // value of McAdams Ellipsen
List<Vector3> vertices = new List<Vector3>();
List<int> indices = new List<int>();
int ind = 0;
// compute JND
foreach(List<Vector2> line in linesArray)
{
foreach(Vector2 point in line)
{
float result = 0f;
Yxy comp = new Yxy(point.X, point.Y);
result = ColorHelper.Chromatic_Difference(color.asXYZ(), comp.asXYZ());
if (result > jnd)
{
vertices.Add(new Vector3(point.X, point.Y, 0f));
indices.Add(ind++);
break;
}
}
}
return LoadVBO(vertices.ToArray(), indices.ToArray());
}
/// <summary>
/// mouse hover ofer the OpenGL Window will be handled here
/// </summary>
/// <author>Markus Strobel</author>
private void glControl_MouseHover(object sender, System.EventArgs e)
{
// Get current mouse position within the glControl
Point mousePos = glControl1.PointToClient(Cursor.Position);
// get x,y relative to an origin in the bottom left
float x = mousePos.X;
float y = glControl1.Height - mousePos.Y;
// normalize to 0..1
x /= glControl1.Width;
y /= glControl1.Height;
if (radioButtonXYZView.Checked)
{
Yxy Yxy = new Yxy(x, y);
hoveredXYZColor = Yxy.asXYZ();
hoveredRGBColor = hoveredXYZColor.asRGB(); //FarbRechner.CIEXYZ_to_RGB(FarbRechner.CIEYxy_to_CIEXYZ(Yxy));
x = (float)Math.Round((double)x, 2);
y = (float)Math.Round((double)y, 2);
// filter negative rgb values
if (!(hoveredRGBColor.R < 0 || hoveredRGBColor.G < 0 || hoveredRGBColor.B < 0))
{
try
{
// normalize
float maxV = Math.Max(hoveredRGBColor.R, Math.Max(hoveredRGBColor.G, hoveredRGBColor.B));
hoveredRGBColor.R /= maxV;
hoveredRGBColor.G /= maxV;
hoveredRGBColor.B /= maxV;
// gamma correction
hoveredRGBColor.R = ColorHelper.Reverse_Gamma_Correction(hoveredRGBColor.R);
hoveredRGBColor.G = ColorHelper.Reverse_Gamma_Correction(hoveredRGBColor.G);
hoveredRGBColor.B = ColorHelper.Reverse_Gamma_Correction(hoveredRGBColor.B);
panelColorPreview.BackColor = Color.FromArgb((int)(hoveredRGBColor.R * 255), (int)(hoveredRGBColor.G * 255), (int)(hoveredRGBColor.B * 255));
labelColorPreviewHex.Text = "#" + ((int)(hoveredRGBColor.R * 255)).ToString("X") + ((int)(hoveredRGBColor.G * 255)).ToString("X") + ((int)(hoveredRGBColor.B * 255)).ToString("X");
}
catch
{
labelColorPreviewHex.Text = "#000";
panelColorPreview.BackColor = Color.Black;
}
}
else
{
labelColorPreviewHex.Text = "#000";
panelColorPreview.BackColor = Color.Black;
}
labelColPreviewXH.Text = "x: " + x.ToString();
labelColPreviewYS.Text = "y: " + y.ToString();
}
}
/// <summary>
/// this method performs all tasks done with a left mouse click in XYZ space
/// </summary>
/// <param name="x">the current x coordinate</param>
/// <param name="y">the current y coordinate</param>
/// <param name="showCircle">if true the selected Color circle will be shown</param>
/// <author>Markus Strobel</author>
private void LeftClickXYZSpace(float x, float y, bool showCircle)
{
// set trackbar values
if (!(hoveredRGBColor.R < 0 || hoveredRGBColor.G < 0 || hoveredRGBColor.B < 0))
{
HSL hsl = hoveredRGBColor.asHSL();
// normalize
float maxV = Math.Max(hoveredRGBColor.R, Math.Max(hoveredRGBColor.G, hoveredRGBColor.B));
hoveredRGBColor.R /= maxV;
hoveredRGBColor.G /= maxV;
hoveredRGBColor.B /= maxV;
// set RGB tab values for trackbars
labelTabRGB_R.Text = "R: " + hoveredRGBColor.R;
labelTabRGB_G.Text = "G: " + hoveredRGBColor.G;
labelTabRGB_B.Text = "B: " + hoveredRGBColor.B;
trackBarR.Value = (int)(hoveredRGBColor.R * 255);
trackBarG.Value = (int)(hoveredRGBColor.G * 255);
trackBarB.Value = (int)(hoveredRGBColor.B * 255);
//set HSL values for trackbars
labelTabHSL_H.Text = "H: " + (hsl.H) + "°";
labelTabHSL_S.Text = "S: " + (hsl.S * 100) + "%";
labelTabHSL_L.Text = "L: " + (hsl.L * 100) + "%";
trackBarH.Value = (int)hsl.H;
trackBarS.Value = (int)(hsl.S * 100);
trackBarL.Value = (int)(hsl.L * 100);
selectedRGBColor = hoveredRGBColor;
selectedXYZColor = hoveredXYZColor;
selectedYxyColor = new Yxy(x, y);
if (checkBoxRGB.Checked)
{
showColorCircle = false;
createRGBPreviewLines(selectedRGBColor);
}
else if (checkBoxHSL.Checked)
{
showColorCircle = false;
createHSLPreviewLines(selectedRGBColor.asHSL());
createHSLPreviewCircle(selectedRGBColor.asHSL());
}
else
{
showColorCircle = showCircle;
createSelectedColorCircleVBO(x, y, 0.01f, 36); // computes color circle position
}
}
else // (!(hoveredRGBColor.R < 0 || hoveredRGBColor.G < 0 || hoveredRGBColor.B < 0))
{
trackBarR.Value = 0;
trackBarG.Value = 0;
trackBarB.Value = 0;
labelTabRGB_R.Text = "R: 0";
labelTabRGB_G.Text = "G: 0";
labelTabRGB_B.Text = "B: 0";
trackBarH.Value = 1;
trackBarS.Value = 100;
trackBarL.Value = 50;
labelTabHSL_H.Text = "H: 1°";
labelTabHSL_S.Text = "S: 100%";
labelTabHSL_L.Text = "L: 50%";
selectedRGBColor = null;
selectedXYZColor = null;
showColorCircle = false;
}
// take current preview Color as selected Color
// we dont need to compute it twice
// set selectedColor Panel, label
panelColorSelected.BackColor = panelColorPreview.BackColor;
labelColorSelectedHex.Text = labelColorPreviewHex.Text;
labelColSelectedXH.Text = labelColPreviewXH.Text;
labelColSelectedYS.Text = labelColPreviewYS.Text;
}
/// <summary>
/// transformatin CIE XYZ -> Yxy
/// </summary>
/// <author>Birthe Anne Wiegand</author>
/// <returns>Yxy value</returns>
public Yxy asYxy()
{
Yxy temp = new Yxy();
// transformation CIE XYZ -> Yxy (luminance Y = 1
temp.Y = 1f;
temp.x = this.X / (this.X + this.Y + this.Z);
temp.y = this.Y / (this.X + this.Y + this.Z);
return temp;
}
