Launch a color value conversion tool

Hello everyone, I am a wolf at the end of the desert.

前几天刚上线一个颜色值转换工具，当然这是借鉴的，可实现：

1. Conversion between HEX, RGB, RGBA, ARGB, and HSL;
2. It shows a very useful CSS color table that can be found and used during development: 147 color names (17 standard colors plus 130 other colors) defined in HTML and CSS color specifications.

This article briefly lists a few translations and comparisons between relevant JS code and C#code when developing this tool, so as to facilitate subsequent similar development reference.

JS文件：点这

1. Color Value HEX Conversion

提取HEX#9A3B34中R（Red）、G（Green）、B（Blue）的色值。

JS code

function parseHEX(val) {
    let color = new Color();
    try {
        let rgx = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
        let hex = val.replace(rgx, function (m, r, g, b) {
            return r + r + g + g + b + b;
        });
        let rgb = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
        color.r = parseInt(rgb[1], 16);
        color.g = parseInt(rgb[2], 16);
        color.b = parseInt(rgb[3], 16);
    } catch (e) {
        console.log(e)
    }
    return color;
}

C#code

public static Color? ParseHEX(string hexColor)
{
    hexColor = hexColor.TrimStart('#');

    Regex regex = new(@"^([0-9a-fA-F]{2})([0-9a-fA-F]{2})([0-9a-fA-F]{2})$");
    var match = regex.Match(hexColor);

    if (match?.Success == true)
    {
        int red = Convert.ToInt32(match.Groups[1].Value, 16);
        int green = Convert.ToInt32(match.Groups[2].Value, 16);
        int blue = Convert.ToInt32(match.Groups[3].Value, 16);

        return new Color(red, green, blue);
    }
    else
    {
        return null;
    }
}

2. Color Value RGBA Conversion

The conversion logic is basically the same as above.

JS code

function parseRGBA(val) {
    let color = new Color();
    try {
        let rgba = /^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)$/.exec(val);
        color.r = parseInt(rgba[1]);
        color.g = parseInt(rgba[2]);
        color.b = parseInt(rgba[3]);
        color.a = parseFloat(rgba[4] || 1);
    } catch (e) {
        console.log(e)
    }
    return color;
}

C#code

public static Color? ParseRGBA(string color)
{
    Regex regex = new Regex(@"^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)$");
    var match = regex.Match(color);

    if (match?.Success == true)
    {
        int r = int.Parse(match.Groups[1].Value);
        int g = int.Parse(match.Groups[2].Value);
        int b = int.Parse(match.Groups[3].Value);
        if (!double.TryParse(match.Groups[4].Value, out double a))
        {
            a = 1;
        }

        return new Color(r, g, b, a);
    }

    return null;
}

It is very convenient to translate JS code into C#code through chatGPT. It is very fast to make a Blazor tool. Other online programming language translation websites are not ideal. In more cases, you still need to modify them manually.

• 本工具地址：Blazor Server版， Blazor Wasm版
• 网站源码及Issue：源码，Issue
• .NET版本： .NET 8.0.0-preview.5.23280.8
• WeChat technology group: To add webmaster WeChat (codewf), you must note the two words "join the group"
• QQ technology group: 771992300