Function getPt

src/traces/scatter/line_points.js:62–87

(index)

    // turn one calcdata point into pixel coordinates
    function getPt(index) {
        var di = d[index];
        if(!di) return false;
        var x = opts.linearized ? xa.l2p(di.x) : xa.c2p(di.x);
        var y = opts.linearized ? ya.l2p(di.y) : ya.c2p(di.y);

        // if non-positive log values, set them VERY far off-screen
        // so the line looks essentially straight from the previous point.
        if(x === BADNUM) {
            if(xLog) x = xa.c2p(di.x, true);
            if(x === BADNUM) return false;
            // If BOTH were bad log values, make the line follow a constant
            // exponent rather than a constant slope
            if(yLog && y === BADNUM) {
                x *= Math.abs(xa._m * yLen * (xa._m > 0 ? LOG_CLIP_PLUS : LOG_CLIP_MINUS) /
                    (ya._m * xLen * (ya._m > 0 ? LOG_CLIP_PLUS : LOG_CLIP_MINUS)));
            }
            x *= 1000;
        }
        if(y === BADNUM) {
            if(yLog) y = ya.c2p(di.y, true);
            if(y === BADNUM) return false;
            y *= 1000;
        }
        return [x, y];
    }

    function crossesViewport(xFrac0, yFrac0, xFrac1, yFrac1) {
        var dx = xFrac1 - xFrac0;