public void findColor(int R, int G, int B, int formX, int formY)
{
string region;
string colorName;
// Determine the color region among ROYGBIV + White and Black
// Evenly divided into 8 smaller cubes.
if (R <= 128)
{ // Lower half of the color cube.
if (G <= 128)
{
if (B <= 128)
{
region = "Black region";
}
else
{
region = "Blue region";
}
}
else
{
if (B <= 128)
{
region = "Green region";
}
else
{
region = "Cyan region";
}
}
}
else
{ // Higher half of the color cube.
if (G <= 128)
{
if (B <= 128)
{
region = "Red region";
}
else
{
region = "Magenta region";
}
}
else
{
if (B <= 128)
{
region = "Yellow region";
}
else
{
region = "White region";
}
}
}
Color original = Color.FromArgb(R, G, B);
// Calculate the distance from the given color to every other color in the table.
double minDistance = 1;
double cDistance;
int index = 0;
for (int i = 0; i < colorTable.Length; i++)
{
cDistance = Math.Sqrt(Math.Pow((R - colorTable[i].red), 2) + Math.Pow((G - colorTable[i].green), 2)
+ Math.Pow((B - colorTable[i].blue), 2));
if (0.0 == cDistance)
{ // Color found! The two points match!
colorName = colorTable[i].colorName;
Form colorFormExact = new color(true, original, original, region, colorName);
colorFormExact.Load += delegate
{
colorFormExact.Location = new Point(formX, formY);
};
colorFormExact.Show();
return;
}
if (0 == i)
{ // Initialize minDistance
minDistance = cDistance;
}
if (cDistance < minDistance)
{ // New minimum.
minDistance = cDistance;
index = i;
}
}
// Found closest, most similar color.
Color similar = Color.FromArgb(colorTable[index].red, colorTable[index].green, colorTable[index].blue);
colorName = colorTable[index].colorName;
Form colorFormSimilar = new color(false, original, similar, region, colorName);
colorFormSimilar.Load += delegate
{
colorFormSimilar.Location = new Point(formX, formY);
};
colorFormSimilar.Show();
}