Thanks for the idea. I tried it out and it seems like it would work
except that the bars seems be overlap a bit.
In the example below the bars have width of 53px but are positioned
52px apart. When they're solid bars it's not really noticeable but
with semi-transparent images you notice it right away when they
overlap a bit.
Following is the test code inside my EntryPoint:
public void onModuleLoad() {
GChart.setBlankImageURL(GWT.getModuleBaseURL()
+GChart.DEFAULT_BLANK_IMAGE_URL);
GChart gchart = new GChartExample01();
gchart.update();
RootPanel.get().add(gchart);
}
static class GChartExample01 extends GChart {
GChartExample01() {
setChartSize(990, 200);
setHoverTouchingEnabled(false);
long numberOfPoints = 20;
addCurve();
getCurve().getSymbol().setSymbolType
(GChart.SymbolType.VBAR_SOUTH);
getCurve().getSymbol().setBackgroundColor("green");
getCurve().getSymbol().setModelWidth(1.0);
getCurve().getSymbol().setBorderWidth(0);
for (int i = 0; i < numberOfPoints; i++) {
getCurve().addPoint(i, Random.nextInt(4000));
}
addCurve();
getCurve().getSymbol().setSymbolType
(GChart.SymbolType.VBAR_SOUTH);
getCurve().getSymbol().setBackgroundColor("blue");
getCurve().getSymbol().setModelWidth(1.0);
getCurve().getSymbol().setBorderWidth(0);
for (int i = 0; i < numberOfPoints; i++) {
getCurve().addPoint(i, Random.nextInt(4000));
}
getXAxis().setHasGridlines(false);
}
}
On Feb 12, 3:18 am, John Gunther <[email protected]> wrote:
> I noticed this is your very first post to any Google forum. Welcome.
>
> GChart2.4 has a built-in single point selection capability. Here's an
> example of how to use that:
>
> http://gchart.googlecode.com/svn/trunk/doc/com/googlecode/gchart/clie...
>
> To emulate multiple selection, you could add a second curve that had
> the same symbol type (and other properties such as width) as the first
> (so that it would overlay it) but only included the points (bars) you
> wanted to be selected. The setImageURL method could then be applied to
> this second curve, passing in your semi-transparent image.
>
> Selection/deselection would then be a matter of adding/removing points
> to/from this second curve, and calling the update method to refresh
> the chart.
>
> John C. Guntherhttp://gchart.googlecode.com
>
> On Feb 11, 1:38 pm, Paul Wang <[email protected]> wrote:
>
> > Hi,
>
> > I'd like to put a semi-transparent panel on top of agchartto show
> > disabled areas of a bar graph. I looked throughgchart2.4 and didn't
> > see anything that'd let me easily find out where bars are located so I
> > can position a panel on top of it.
>
> > Is there a better way to do this? I also need to do this without any
> > user input (no events).
>
> > --
> > Paul Wang
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