How to get continues x and y cordinate of pen like tool

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chhaya gohel
chhaya gohel 2014-12-24
评论： Image Analyst 2014-12-27
hii i devloped one pen like tool by which user can write with mouse or touch pad. in my gui i am using WindowButtonUpFcn WindowButtonDown WindowButtonMotionFcn. i m storing x and y co ordintes but some points misses during the write up. can any one help me? i want to get continues x and y points
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Geoff Hayes
Geoff Hayes 2014-12-24
You may need to post done of your code so that we can get an idea of what you are doing. Or describe which points are missing - all those near the end of the write up or...?
chhaya gohel
chhaya gohel 2014-12-27
sir pen.m is my source code in which i am storing x and y co-ordinates in Strokes.csv file but because of fast movement of mouse i am not getting continuous points between pen_down to pen_up events. what i want is continuous plotting of points form one pen_down event to next pen_up event. in my code pen.m user can write pressing mouse button and when its writing done he/she can release mouse button. now i want continuous plotting of all the points of mouse moment from down to up. i attached file of code.

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Image Analyst
Image Analyst 2014-12-24
You could also use imfreehand to do that. Like you said, sometimes there are gaps - it just depends on how fast you move the mouse. Move it fast and there will be a large distance between the points that it recorded.
I suggest using John D'Errico's interparc function http://www.mathworks.com/matlabcentral/fileexchange/34874-interparc to get points uniformly spaced along the curve you drew.
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chhaya gohel
chhaya gohel 2014-12-27
thank you sir , but sir what i want is explained below:
sir pen.m is my source code in which i am storing x and y co-ordinates in Strokes.csv file but because of fast movement of mouse i am not getting continuous points between pen_down to pen_up events. what i want is continuous plotting of points form one pen_down event to next pen_up event. in my code pen.m user can write pressing mouse button and when its writing done he/she can release mouse button. now i want continuous plotting of all the points of mouse moment from down to up. i attached file of code.
Image Analyst
Image Analyst 2014-12-27
The second line in the help is wrong
% pen.m is a GUI ready to use
Of course, it doesn't run and throws an error when I try to draw in the figure.
Anyway what you said does not alter my answer. You need to interpolate points and you can use interp1() or interparc().

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