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Opposite of RGB?
Message
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Miscellaneous
Thread ID:
01668191
Message ID:
01668225
Views:
101
This message has been marked as the solution to the initial question of the thread.
Likes (1)
>Hi everybody,
>
>We store result of the GetColor function in the database as integer value. Now we want to use this in Web Application to set the color. Do you know what is the simplest way to convert this integer value into the value suitable for HTML (in C# / JavaScript code, if possible)?
>
>Thanks in advance.

Javeacript split into several functions in a color service:
export class ColorService {

  colorToHex(lncolor: number): string {
    let rgb=this.colorToRGB(lncolor);
    return this.RGBToHex(rgb[0],rgb[1],rgb[2]);
  }

  colorToRGB(lncolor: number ): number[] {
    let b=Math.floor(lncolor/(256*256));
    let g=Math.floor((lncolor-(b*256*256))/256);
    let r=Math.floor(lncolor-b*256*256-g*256);
    return [r,g,b];
  }

  RGBToHex(r,g,b): string {
    let bin = r << 16 | g << 8 | b;
    return '#'+(function(h){
        return new Array(7-h.length).join("0")+h;
    })(bin.toString(16).toUpperCase());
  }

  hexToColor(hex: string): number {
    if (hex.length<6) {
      let shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
      hex = hex.replace(shorthandRegex, function(m, r, g, b) {
        return r + r + g + g + b + b;
      });
    }
    let result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    let color=parseInt(result[1], 16)+parseInt(result[2], 16)*256+parseInt(result[3], 16)*256*256;
    return color;
  }
}
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