Recent changes to bugs

window close control dead until mouse pointer movement

Anonymous — Sat, 14 Sep 2019 12:54:50 -0000

If a window close control is clicked and subsequently a new window is painted in the same position it should be possible to close the new window without moving the mouse pointer. The bug is that the mouse pointer must be moved some arbitrarily small distance before the close control on the new window will function. Typically this means the mouse pointer will be moved away from the close control and moved back onto the close control. It may be that any mouse movement of any small distance is necessary before the click to close.

Version: 3.2.2 of JChart 2D on Ubuntu 16.04
This bug has been observed since some number of years before 2016. In general JChart 2D is a great product.

Some Pointpainters should not draw interpolated points

Anonymous — Tue, 19 Sep 2017 14:01:50 -0000

I have discovered an issue with pointpainters that occurs when the point to be drawn is interpolated (that is, it lies on either the far left or far right edge of the chart). Normally you want a line to be interpolated from a visible point to a point off the screen, so the line extends to the edge. This is the expected behavior for PointPainterLine. However it is confusing for PointPainterVerticalBar and PointerPainterDisc because it looks as if there is a real data point at the edge of the screen. Therefore these pointpainters should not draw themselves if the point is interpolated. My work around so far is to not draw the points if the point lies at the start or stop pixel. In the paintPoint() method of either PointPainterVerticalBar or PointPainterDisc, I modified the method body as follows:

if (absoluteX > m_chart.getXChartStart() && absoluteX < m_chart.getXChartEnd())
g.fillRect.....

Point highlighted is not the expected point

SimonD — Thu, 02 Jun 2016 15:21:12 -0000

Using the followin configuration:
chart.setToolTipType(Chart2D.ToolTipType.VALUE_SNAP_TO_TRACEPOINTS);
and
trace.setPointHighlighter(new PointPainterDisc(8));

The nearst point near the mouse has is coordinate displayed properly in the tooltip but the point highlighted is actually the next point in the trace.

Logaritmic Label below 1 not displayed

Anonymous — Fri, 13 May 2016 15:35:07 -0000

Hi,

I am trying to display really small values (uV) on a logaritmic chart.

With the fix done earlier this year, values below 1 can be displayed but there is no label on the chart.

We are using the "transformed" axis.
We are wrapping the chart in the uimenu decorator.

Chart2D chart = new Chart2D();
chart.setUseAntialiasing(true);
AAxis<?> axisy = new AxisLog10<AxisScalePolicyTransformation>();
DecimalFormat df = new DecimalFormat();
df.setMaximumFractionDigits(100);
chart.setAxisYLeft(axisy, 0);
axisy.setFormatter(new LabelFormatterAutoUnits(new LabelFormatterNumber(df)));
ChartPanel chartpanel = new ChartPanel(chart);
content.add(chartpanel );

I can multiply the data by 1000000 so that labels are displayed, but no label has a value below 1. (no 0.1, 0.01 , 0.001, etc)

As a first improovement, I changed AxisScalePolicyTransformation.getScaleValues(...) to start the labels "lower" by changing the line 75 from "double exp = 0.;" to " double exp = -10.;"

It does not seems to change anything with the label above 1 but it does add the label below.
To see the extra label, at least one point need to be above 1. If all points are lower, no label get generated.

Before I continue investigating, I was wondering if you could answer the following question:

Which class is in charge of generating the axis ticks? (AxisScalePolicyManualTicks vs AxisScalePolicyTransformation)

I can send attachement of the results if needed.

Thank you verry much!

#117 [rawtypes] found raw type: IAxis

Achim Westermann — Fri, 27 Nov 2015 21:31:03 -0000

Hi Simon,

yes that's weak. I should have some time from December 10th on to fix the issue. Unfortunately not sooner.

thx for reporting.

cheers,
Achim

#117 [rawtypes] found raw type: IAxis

Achim Westermann — Fri, 27 Nov 2015 09:21:22 -0000

Hi Achim,

Thanks for your quick reply! With an added type indication < ? > like in

IAxis< ? > axisX = staticChart.getAxisX();

or like in your source, I then not only get a compilation warning but even the following compilation error:

error: incompatible types: AxisScalePolicyManualTicks cannot be converted to CAP#1
    axisX.setAxisScalePolicy(new AxisScalePolicyManualTicks());
                             ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends IAxisScalePolicy from capture of ?

Kind regards,

Simon

#117 [rawtypes] found raw type: IAxis

Achim Westermann — Fri, 27 Nov 2015 01:26:13 -0000

Hi Simon,
the source you refer to is some totally outdated example. Even if jchart2d has been in a long hiatus for now.

Try stick to the examples within the original source: http://sourceforge.net/p/jchart2d/code/ci/master/tree/src/info/monitorenter/gui/chart/demos/AdvancedDynamicChart.java

However I don't know which version of the library you use.

kind regards,
Achim

[rawtypes] found raw type: IAxis

Anonymous — Thu, 26 Nov 2015 15:14:39 -0000

Hi,

Great library - thank you for sharing it!

However,

 IAxis axisX = staticChart.getAxisX();

at http://www.coderanch.com/how-to/java/JChart2DDemo generates the following warning:

warning: [rawtypes] found raw type: IAxis
    IAxis axisX = staticChart.getAxisX();
    ^
missing type arguments for generic class IAxis<T>
    where T is a type-variable:
    T extends IAxisScalePolicy declared in interface IAxis

Please, what is the correct type declaration?
(I also tried IAxis<IAxisScalePolicy> without success.)

Many thanks and best regards,

Simon

#116 Chart's Y label acts weird

Achim Westermann — Mon, 17 Feb 2014 19:58:45 -0000

Hi Paulius,

please stick to one bug per ticket.
I don't currently get what all you are addressing.

I need 1 bug / 1 problem per ticket. And ideally a JUnit test that isolates to bug to reproduce it (and have a regression test for further releases). Else I would first have to try to isolate that bug, then reproduce it, then fix it and finally to write a regression test to avoid, that in future releases I will break things again. It's about sharing and helping community in OpenSource.

cheers,
Achim

#116 Chart's Y label acts weird

Paulius — Thu, 09 Jan 2014 22:28:18 -0000

So it seems this problem is even uglier then you retrace your chart with new data. So I've decided to play with the AxisTitlePainterDefault.class. The rotation seemed to be not working correctly so after a bit of searching and testing I've found a better method to draw a rotated text:

private void drawString(Graphics g, double x, double y, String label) {

         Graphics2D g2D = (Graphics2D)g;

        // Create a rotation transformation for the font.
        AffineTransform fontAT = new AffineTransform();

        // get the current font
        Font theFont = g2D.getFont();

        // Derive a new font using a rotatation transform
        fontAT.rotate(270 * java.lang.Math.PI/180);
        Font theDerivedFont = theFont.deriveFont(fontAT);

        // set the derived font in the Graphics2D context
        g2D.setFont(theDerivedFont);

        // Render a string using the derived font
        g2D.drawString(label, (int)x, (int)y);

        // put the original font back
        g2D.setFont(theFont);
    }
}

I've found it here - http://greybeardedgeek.net/2009/05/15/rotated-text-in-java-swing-2d/
Now it work correctly - no Y axis label jumping or new labels appearing on the chart. Hope you'll include this method in bug fix release.