/** * Red, Green, Blue color model */ class ColorRGB extends Color { /** * Red */ /** * Green */ /** * Blue */ constructor(a, b, c, d = 1) { super(); d = undefined === d ? 1 : d; this.R = a; this.G = b; this.B = c; this.alpha = d; this.meta = {}; assertRange(a, 1, "red"); assertRange(b, 1, "green"); assertRange(c, 1, "blue"); assertRange(d, 1, "alpha"); } setMeta(m) { this.meta = m; } toLAB() { return rgb2lab(this); } equals(a) { return ( Math.abs(this.R - a.R) < O && Math.abs(this.G - a.G) < O && Math.abs(this.B - a.B) < O && Math.abs(this.alpha - a.alpha) < O ); } static fromString(s) { const m = s.match( /^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})?$/i ); if (m) { const a = m[4] ? parseInt(m[4], 16) / 255 : 1; return new ColorRGB( parseInt(m[1], 16) / 255, parseInt(m[2], 16) / 255, parseInt(m[3], 16) / 255, a ); } return ColorRGB.black; } static fromInt(colorInt) { return ColorRGB.fromString( "#" + ("000000" + colorInt.toString(16)).slice(-6) ); } toInt() { const transparent = 0x00000000; function f(v) { return Math.floor(v * 255); } return ( transparent | (f(this.a) << 32) | (f(this.R) << 16) | (f(this.G) << 8) | f(this.B) ); } mix(other, t) { return new ColorRGB( this.R * (1 - t) + other.R * t, this.G * (1 - t) + other.G * t, this.B * (1 - t) + other.B * t, this.alpha * (1 - t) + other.alpha * t ); } toString() { return toHexColor(this); } toTuple() { return [ Math.round(255 * this.R), Math.round(255 * this.G), Math.round(255 * this.B) ]; } /** Euclidean distance in LAB color space (delta E) */ distance(other) { const lab = rgb2lab(this); const lab2 = rgb2lab(other); const dE = Math.sqrt( Math.pow(lab.L - lab2.L, 2) + Math.pow(lab.A - lab2.A, 2) + Math.pow(lab.B - lab2.B, 2) ); return dE; } }