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  How to scale images in a chart?
Posted by Eva on Sep-04-2012 23:50
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Hi Peter,

I need to add png images to may gantt chart that need to be scaled to a smaller size.  I was thinking to use setDataSymbol2(imageFilename) method on a dataSet, but this method doesn?t supply the size.  How can this be done without editing the images itself?

I need to add the images to the chart and the legend.

(I use Java)

Thank you,
Eva

  Re: How to scale images in a chart?
Posted by Peter Kwan on Sep-05-2012 11:26
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Hi Eva,

You may try to use a DrawArea object to dynamically generate the resized symbol, then use the DrawArea object as symbol. It is like:

DrawArea d = new DrawArea();

//if you need to set search path for the file, you would need to call d.setSearchPath first
d.loadPNG(imageFilename);
d.resize(32, 32);

myDataSet.setDataSymbol3(d);

Hope this can help.

Regards
Peter Kwan

  Re: How to scale images in a chart?
Posted by Eva on Sep-06-2012 02:38
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Thank you Peter for your response.

I have been trying to test your suggestion, but I?m having a little problem:
The loadPNG(imageFilename) returns false.

I already use a call in my app to set the path as:
chart.setSearchPath3(servletContext);

And I seem to get an image a proper image to be displayed on my title using ?<*img=? + imageFilename.

Just for testing I use even the same imageFilename.

So, I defined a draw area as follows:
DrawArea d = new DrawArea();
boolean result = d.loadPNG(imageFilename);

I get the result= false. I assume I need a true value before I continue.

Please advise,
Eva

  Re: How to scale images in a chart?
Posted by Peter Kwan on Sep-06-2012 16:27
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Hi Eva,

The chart.setSearchPath only applies to the chart object, not to the DrawArea object (which is a separate object not derived from the chart). So you would need to d.setSearchPath:

DrawArea d = new DrawArea();
d.setSearchPath3(servletContext);
boolean result = d.loadPNG(imageFilename);

Please let me know if this can solve the problem.

Regards
Peter Kwan

  Re: How to scale images in a chart?
Posted by Eva on Sep-06-2012 23:23
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Thank you, Peter. This worked!

FYI ? Earlier I did try setting a path with the d.setSearchPath(url) (but not with d.setSearchPath3(servletContext)), since I didn?t have the ServletContext available anymore.

I tested the ?url + imageFilename? string, and the image was easily retrieved when put in the IE url.

Thanks again! Great support as always!
Eva