Created attachment 540 [details]
source code to demonstrate problem

If there are less than 2 unique Y values in a series and auto scaling is set to true for the vertical axis, the chart will cause Java / Swing to lockup during a paint cycle. 

Per Yeray Alonso, on 2/19/2015 the following is the change required to fix the bug, which we verified by compiling the source code with the change:

In the sources, at com\steema\teechart\axis\Axis.java you'll find a method named maxLabelsValueWidth() ending as follows:

    private int maxLabelsValueWidth() {
        //...
        if (tmp != 0) {
            tmpResult = 0;
            int limit = 5000;

            do {
                tmpResult = Math.max(tmpResult, chart.multiLineTextWidth(labels.labelValue(tmpB)).width);

                tmpB -= tmp;
                limit -= 1;
            } while ((tmpB < tmpA) || (limit == 0));
        } else {
            tmpResult = (chart.getGraphics3D().textWidth(" ")
                    + Math.max(chart.multiLineTextWidth(
                                    labels.labelValue(tmpA)).width,
                            chart.multiLineTextWidth(labels.labelValue(tmpB)).width));
        }

        //          GetAxisLabel=oldGetAxisLabel;
       
        return tmpResult;
    }

Change it for just this:

    private int maxLabelsValueWidth() {
        //...
        double tmpC = tmp * (int) ((iMaximum - tmp) / tmp);
        tmpResult = chart.getGraphics3D().textWidth(" ")
                + Math.max(Math.max(chart.multiLineTextWidth(labels.labelValue(tmpA)).width,
                                chart.multiLineTextWidth(labels.labelValue(tmpB)).width),
                        chart.multiLineTextWidth(labels.labelValue(tmpC)).width);
       
        return tmpResult;
    }