@aesys/ngx-rating/esm2015/lib/color-generator.js

Angular Library for creating RATING elements.

export function getColorScale(items) {
    if (!checkIntegrity(items)) {
        console.error("ALL RGB VALUES MUST BE BETWEEN 0 AND 255");
        return items.map(item => {
            return Object.assign(Object.assign({}, item), { color: getColor(255, 0, 0) });
        });
    }
    if (!items[0].color) {
        console.error("SET FIRST ITEM'S COLOR FIELD");
        let toReturn = items;
        toReturn[0].color = getColor(255, 0, 0);
    }
    if (items[0].color && !items[items.length - 1].color) {
        const color = items[0].color;
        return items.map(item => { return Object.assign(Object.assign({}, item), { color: color }); });
    }
    else {
        let toReturn = [items[0]];
        while (toReturn.length !== items.length) {
            let toCalculate = [];
            let first = toReturn[toReturn.length - 1].color || {};
            for (let i = toReturn.length; !items[i].color && i < items.length; i++) {
                toCalculate.push(items[i]);
            }
            let last = items[toReturn.length + toCalculate.length].color || {};
            toReturn = toReturn.concat(calculateColors(first, last, toCalculate));
            toReturn.push(items[toReturn.length]);
        }
        return toReturn;
    }
}
function getColor(red, green, blue) {
    return {
        red: red,
        green: green,
        blue: blue
    };
}
function calculateColors(first, last, items) {
    const difference = getColor(last.red - first.red, last.green - first.green, last.blue - first.blue);
    return items.map((item, idx) => {
        return Object.assign(Object.assign({}, item), { color: getColor(first.red + ((difference.red / (items.length + 1)) * (idx + 1)), first.green + ((difference.green / (items.length + 1)) * (idx + 1)), first.blue + ((difference.blue / (items.length + 1)) * (idx + 1))) });
    });
}
export function toColorString(color) {
    return `rgb(${color.red},${color.green},${color.blue})`;
}
function checkIntegrity(items) {
    let integrity = true;
    items.forEach(item => {
        if (item.color) {
            if (!checkItem(item.color)) {
                integrity = false;
            }
        }
    });
    return integrity;
}
function checkItem(color) {
    if (color.red < 0 || color.red > 255) {
        return false;
    }
    if (color.green < 0 || color.green > 255) {
        return false;
    }
    if (color.blue < 0 || color.blue > 255) {
        return false;
    }
    return true;
}
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