Launch a Color Value Conversion Tool

Hello everyone, I am Wolf at the End of the Desert.

A few days ago, I just launched a color value conversion tool, which is of course a reference from others. It can:

1. Convert between HEX, RGB, RGBA, ARGB, and HSL;
2. Display a very practical CSS color table for use during development: 147 color names defined in the HTML and CSS color specification (17 standard colors plus 130 additional colors).

This article briefly lists a few places where the JS code and C# code were compared during the development of this tool, for your reference in similar future development.

JS file: Click here

1. HEX Color Value Conversion

Extract the R (Red), G (Green), B (Blue) values from the HEX #9A3B34.

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. RGBA Color Value 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;
}

Using ChatGPT, it is very convenient to translate JS code into C# code, making it quick to build a Blazor tool. Other online programming language translation websites are not ideal, and most of the time manual adjustments are still needed.

• Tool address: Blazor Server version, Blazor Wasm version
• Website source code and Issues: Source code, Issue
• .NET version: .NET 8.0.0-preview.5.23280.8
• WeChat technical group: Add the site owner's WeChat (codewf), be sure to note the two characters "入群" (join group)
• QQ technical group: 771992300