color.js

class Color extends Object {
    // 表示颜色的类
    constructor(r, g, b, a) {
        super()
        this.r = r
        this.g = g
        this.b = b
        this.a = a
    }
    static newHex(hex) {
        hex = hex.replace('#', '')
        let r = parseInt(hex.substring(0, 2), 16)
        let g = parseInt(hex.substring(2, 4), 16)
        let b = parseInt(hex.substring(4, 6), 16)
        let a = 255
        return this.new(r, g, b, a)
    }
    interpolate(other, factor) {
        let c1 = this
        let c2 = other
        let r = c1.r + (c2.r - c1.r) * factor
        let g = c1.g + (c2.g - c1.g) * factor
        let b = c1.b + (c2.b - c1.b) * factor
        let a = c1.a + (c2.a - c1.a) * factor
        return Color.new(r, g, b, a)
    }
    equal(c) {
        if (this.r === c.r && this.g === c.g && this.b === c.b && this.a === c.a) {
            return true
        }
        return false
    }
    // 随机颜色
    static randomColor() {
        // random01 是 utils.js 中的函数
        return this.new(random01() * 255, random01() * 255, random01() * 255, 255)
    }
    // 常见的几个颜色
    static black() {
        return this.new(0, 0, 0, 255)
    }
    static white() {
        return this.new(255, 255, 255, 255)
    }
    static transparent() {
        return this.new(0, 0, 0, 0)
    }
    static red() {
        return this.new(255, 0, 0, 255)
    }
    static green() {
        return this.new(0, 255, 0, 255)
    }
    static blue() {
        return this.new(0, 0, 255, 255)
    }
}