| Issue 21: | Client to model cordinates conversion method request | |
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Hi, I was exploring GChart and I wanted to write a program which would capture mouse click events along x-y axis of a chart and draw points on the chart where mouse down occured. I could not find any methods in GChart API to convert from client mouse cordinates to model cordinates of the chart. I posted my query on GWT and got a reply from Mr. John Gunther explaining thoroughly how the conversion can be done with an example to support it. Thanks a million for that. This is an enhancement request for adding a method for directly converting from client cordinates to chart model cordinates. This feature would be extremely useful in situations like highlighting a certain portion of an already drawn chart. regards, Saurabh Hirani |
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Feb 02, 2009
Appreciate your request. I am planning to add a method getMouseCoordinate() to the Axis class that returns the current mouse location (in that axis' model units) projected along that axis. So you could write lines like getCurve().addPoint(getXAxis().getMouseCoordinate(),getYAxis().getMouseCoordinate()); That's not exactly a client to model coordinate converter, but it would have allowed your original request to have been satisfied, and it greatly simplified the "World's Simplest Line Editor", making it more worthy of that name. If such a method would not solve your problem, more details about what you are doing would be appreciated. Before I got your issue I was planning to just release this simple enhancement, and add actual client to model conversion if/when specific examples came up that required it. John
Status: Accepted
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Feb 02, 2009
(No comment was entered for this change.)
Owner: johncurtisgunther
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Feb 03, 2009
getCurve().addPoint(getXAxis().getMouseCoordinate(),getYAxis().getMouseCoordinate()); That would work for me. In fact, it would be better than the client to model converter as it would also spare me the effort of looking at getClientX or getClientY. And as my marking of areas would be limited to the chart, having a function which maps mouse cordinates to model units along the axis would be good enough. |
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Feb 10, 2009
(No comment was entered for this change.)
Labels: Milestone-Release2.41
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Feb 12, 2009
See the first section of the 2.41 release notes (available via a link from the home page) for a description of the getMouseCoordinate, clientToModel, and modelToClient methods that address this issue. By sharing your ideas you have materially improved GChart. Please pass along similarly useful stuff you notice as you use GChart. John
Status: Verified
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Jul 29, 2009
Saw that. Thanks for adding the feature. I appreciate your prompt follow ups on requests and making GChart such a great tool. |
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