valueFormatting affect series tooltips

[zpydee]

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[ ] feature request
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Current behavior i have noticed that using the valueFormatting function in gauges not only affect the centre value but also changes the values shown in series tooltips. For example:

[StephS]

I had this exact issue. I made a quick fix by overriding the function:

import { NgxChartsModule, GaugeComponent } from '@swimlane/ngx-charts';

GaugeComponent.prototype.getDisplayValue = function () {
    if (this.textValue && 0 !== this.textValue.length) {
        return this.textValue.toLocaleString();
    }
    if (this.valueFormatting) {
        return this.valueFormatting(this.results);
    }
    var value = this.results.map(function (d) { return d.value; }).reduce(function (a, b) { return a + b; }, 0);
    return value.toLocaleString();
};

this made it so you get the full dataset, then can apply whatever transformation you want instead of the reduce/sum.

to use set valueFormatting to your function. here i check if it's an array, which means it's the data:

someValueFormat(val: any): string {
    if (val instanceof Array) {
        return val[0]['name'] + ' ' + val[0]['value'].toLocaleString();
    } else {
        return val.toLocaleString();
    }
}

ideally the tooltip and center text should have different functions, but this method works in a pinch. now all i need is to add multiline so i can show all of my data in the center.