How to find all the points of a given graph line

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Anas Blue 2013-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/81460-how-to-find-all-the-points-of-a-given-graph-line

Hi everyone I want to find all the points from a plot and save it in array for example I've this graph I want all the point from the beginning of the line to the end of it

    % Drawing a Trajectory
    prompt={'Enter The Number Of Lines:'};  % Enter statements at the Command    Window to accept input from you.
    title='Draw Line '; % Name the Command Window
    n=inputdlg(prompt); % Create and open input dialog box
   % A = str2num(cell2mat(n)); % Convert from String to Int
    A = sscanf(n{1}, '%d'); % Convert from String to Int
   [x,y] = ginput(A); % Graphical input from mouse or cursor
    plot(x,y)
   posth = [x,y];  % Save 'x' and 'y' as Array

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Kartik Katti 2013-7-9

You can use Image processing tool box on the graph to solve for the points which are black in color. I'm trying on those lines.

Anas Blue 2013-7-9

Thanks man

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Answer 1

Jan 2013-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/81460-how-to-find-all-the-points-of-a-given-graph-line#answer_91223

编辑：Jan 2013-7-10

The line from x(1)/y(1) to x(2)/y(2) has an infinite number of points in the mathematical sense. If you want the pixels on the screen, notice that the result will depend on the resolution of the monitor and several other settings.

So please explain again, which kind of "points" you want.

[EDITED] Look in the FileExchange for the Bresenham method: http://www.mathworks.com/matlabcentral/fileexchange/index?utf8=%E2%9C%93&term=Bresenham