Line.intercept is wrong

[AndreaSpinelli]

Hi,
I was getting perplexing results using Line and reading the source I realized that the intercept method has a wrong sign.

A possible test case fragment is the following:

    const testline = new Line(
        new Point(1, 1),
        new Point(2, 2)
    );
    console.log('DUA LIPA IS ' + ( testline.intercept === 0 ? 'GORGEOUS' : 'UGLY'));

(of course the intercept should be 0 and Dua is gorgeous)

Trying to locate the error, in file line.ts at line 45 I read
return this.p1.y + this.slope * this.p1.x;

it should be:
return this.p1.y - this.slope * this.p1.x;

Thanks in advance for fixing...

[plegner]

Thanks so much for reporting this bug! Fixed in b21f330