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I am working on a project with qwt. And what I am trying to do is obtaining the coordinates where my mouse click on. I searched on the Internet and find it might be relevant to the QwtPlotPicker class. But I can't find any function that may meet my need in the official document. Is there any example I can refer to? Any help will be appreciated.

Andy Fan
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    Show your code please. – eyllanesc Jun 24 '17 at 14:00
  • read this: https://stackoverflow.com/questions/13066035/tool-tip-to-show-plot-values-in-qwt – eyllanesc Jun 24 '17 at 14:02
  • actually it is parts of an unfinished project, is the source code really needed? It is kind of messy. – Andy Fan Jun 24 '17 at 14:04
  • Check the link that you put in my next comment, there is your answer. – eyllanesc Jun 24 '17 at 14:05
  • Here is another example: https://github.com/pvbrowser/pvb/blob/master/qwt/examples/bode/bode.cpp – eyllanesc Jun 24 '17 at 14:09
  • thanks, I am studying on it. – Andy Fan Jun 24 '17 at 14:09
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    Possible duplicate of [Tool tip to show plot values in Qwt](https://stackoverflow.com/questions/13066035/tool-tip-to-show-plot-values-in-qwt) – eyllanesc Jun 24 '17 at 14:10
  • I try the code in "Tool tip to show plot values in Qwt", but what I get is coordinates floating around my mouse, but I still can't understand how to get the exact values stored in variables. http://imgur.com/a/pLAiN – Andy Fan Jun 24 '17 at 14:38
  • Do you want the position in pixels or do you want the point on the plot? – eyllanesc Jun 24 '17 at 15:11
  • yes, I want the point on the plot. – Andy Fan Jun 24 '17 at 15:14
  • You can share your project even if it is not finished, so you can start testing it. – eyllanesc Jun 24 '17 at 15:15
  • Here is my project. https://drive.google.com/file/d/0B7VyGeuv2EoGZW11SENwdUdLQU0/view?usp=sharing – Andy Fan Jun 24 '17 at 15:23
  • That code works, if you realize it shows you the position of the click with respect to the plot. – eyllanesc Jun 24 '17 at 16:16
  • Please you could explain something more detailed because it seems that your explanation is ambiguous. – eyllanesc Jun 24 '17 at 16:16
  • Actually, I don't even need anything to be displayed on my screen. I want to get the position coordinates in silence after I clicking my mouse(nothing should be displayed), and pass the value to other function that do the further operation. – Andy Fan Jun 25 '17 at 02:18
  • Para obtener la posición lo debes a traves de la señal selected de QwtPlotPicker, para poder verlo en la clase LSPlot este debe heredar de QObject, todas esas modificaciones la hice en el siguiente link: https://github.com/eyllanesc/stackoverflow/tree/master/RE_LightScan – eyllanesc Jun 25 '17 at 04:46

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