logTickGenerator = function (plot, axis, noTicks) {
        var ticks = [],
            minIdx = -1,
            maxIdx = -1,
            surface = plot.getCanvas(),
            logTickValues = PREFERRED_LOG_TICK_VALUES,
            min = clampAxis(axis, plot),
            max = axis.max;

        if (!noTicks) {
            noTicks = 0.3 * Math.sqrt(axis.direction === "x" ? surface.width : surface.height);
        }

        PREFERRED_LOG_TICK_VALUES.some(function (val, i) {
            if (val >= min) {
                minIdx = i;
                return true;
            } else {
                return false;
            }
        });

        PREFERRED_LOG_TICK_VALUES.some(function (val, i) {
            if (val >= max) {
                maxIdx = i;
                return true;
            } else {
                return false;
            }
        });

        if (maxIdx === -1) {
            maxIdx = PREFERRED_LOG_TICK_VALUES.length - 1;
        }

        if (maxIdx - minIdx <= noTicks / 4 && logTickValues.length !== EXTENDED_LOG_TICK_VALUES.length) {
            //try with multiple of 5 for tick values
            logTickValues = EXTENDED_LOG_TICK_VALUES;
            minIdx *= 2;
            maxIdx *= 2;
        }

        var lastDisplayed = null,
            inverseNoTicks = 1 / noTicks,
            tickValue, pixelCoord, tick;

        // Count the number of tick values would appear, if we can get at least
        // nTicks / 4 accept them.
        if (maxIdx - minIdx >= noTicks / 4) {
            for (var idx = maxIdx; idx >= minIdx; idx--) {
                tickValue = logTickValues[idx];
                pixelCoord = (Math.log(tickValue) - Math.log(min)) / (Math.log(max) - Math.log(min));
                tick = tickValue;

                if (lastDisplayed === null) {
                    lastDisplayed = {
                        pixelCoord: pixelCoord,
                        idealPixelCoord: pixelCoord
                    };
                } else {
                    if (Math.abs(pixelCoord - lastDisplayed.pixelCoord) >= inverseNoTicks) {
                        lastDisplayed = {
                            pixelCoord: pixelCoord,
                            idealPixelCoord: lastDisplayed.idealPixelCoord - inverseNoTicks
                        };
                    } else {
                        tick = null;
                    }
                }

                if (tick) {
                    ticks.push(tick);
                }
            }
            // Since we went in backwards order.
            ticks.reverse();
        } else {
            var tickSize = plot.computeTickSize(min, max, noTicks),
                customAxis = {min: min, max: max, tickSize: tickSize};
            ticks = $.plot.linearTickGenerator(customAxis);
        }

        return ticks;
    }
- logTickGenerator(plot, axis, noTicks)

    Generates logarithmic ticks, depending on axis range.
    In case the number of ticks that can be generated is less than the expected noTicks/4,
    a linear tick generation is used.