确定最近的已知颜色

时间:2013-10-11 16:49:26

标签: asp.net .net vb.net colors

我允许我的应用的用户选择自定义颜色,并想要一种方法来显示每种颜色的友好名称,而不是显示十六进制代码的文本表示。

如何为给定的十六进制代码找到最接近的System.Drawing.Color

1 个答案:

答案 0 :(得分:4)

希望这有助于某人...

Public Function GetClosestColor(hex_code As String) As Color
    Dim c As Color = ColorTranslator.FromHtml(hex_code)
    Dim closest_distance As Double = Double.MaxValue
    Dim closest As Color = Color.White

    For Each kc In [Enum].GetValues(GetType(KnownColor)).Cast(Of KnownColor).Select(Function(x) Color.FromKnownColor(x))
        'Calculate Euclidean Distance
        Dim r_dist_sqrd As Double = Math.Pow(CDbl(c.R) - CDbl(kc.R), 2)
        Dim g_dist_sqrd As Double = Math.Pow(CDbl(c.G) - CDbl(kc.G), 2)
        Dim b_dist_sqrd As Double = Math.Pow(CDbl(c.B) - CDbl(kc.B), 2)
        Dim d As Double = Math.Sqrt(r_dist_sqrd + g_dist_sqrd + b_dist_sqrd)

        If d < closest_distance Then
            closest_distance = d
            closest = kc
        End If
    Next

    Return closest
End Function