Function resistanceArc

src/plots/smith/helpers.js:59–86

(subplot, R, X1, X2)

}

function resistanceArc(subplot, R, X1, X2) {
    var r = scale(subplot, 1 / (R + 1));

    var t1 = transform(subplot, smith([R, X1]));
    var x1 = t1[0];
    var y1 = t1[1];

    var t2 = transform(subplot, smith([R, X2]));
    var x2 = t2[0];
    var y2 = t2[1];

    if(sign(X1) !== sign(X2)) {
        var t0 = transform(subplot, smith([R, 0]));
        var x0 = t0[0];
        var y0 = t0[1];

        return [
            'M' + x1 + ',' + y1,
            'A' + r + ',' + r + ' 0 0,' + (0 < X1 ? 0 : 1) + ' ' + x0 + ',' + y0,
            'A' + r + ',' + r + ' 0 0,' + (X2 < 0 ? 0 : 1) + x2 + ',' + y2,
        ].join(' ');
    }

    return [
        'M' + x1 + ',' + y1,
        'A' + r + ',' + r + ' 0 0,' + (X2 < X1 ? 0 : 1) + ' ' + x2 + ',' + y2
    ].join(' ');
}

module.exports = {
    smith: smith,