Problem with drawLine

Posted by Luis Isaac Ramos Garcia on Jul 20, 2010; 8:34am
URL: http://imagej.273.s1.nabble.com/Problem-with-drawLine-tp3687544.html

    Dear Colleges;

    First, I am new with ImageJ and its macro language so sorry if this
is a not interesting.

    I would like to draw a line in a centered image, i.e. the origin of
the coordinates is not the left upper corner instead is more or less the
center of the image.
    The center is at (1182,963) in a 2369x1928 image.

    When I tried the following lines the macro does not work:
           
        setColor(255, 0, 0);
        setLineWidth(1);
        i=0;  

        x1=round((i-14)*(10/0.17));
        y1=-750;
        x2=x1;
        y2=750;
        drawLine(x1,y1,x2,y2);

    Instead if I take the origin of the coordinates the left upper
corner the macro works:

       setColor(255, 0, 0);
        setLineWidth(1);
        i=0;  

        x1=round((i-14)*(10/0.17));
        y1=-750;
        x2=x1;
        y2=750;
        drawLine(x1,y1,x2,y2);

    But the if I change the 14 in the third line by 13....:

       setColor(255, 0, 0);
        setLineWidth(1);
        i=0;  

        x1=round((i-13)*(10/0.17));
        y1=-750;
        x2=x1;
        y2=750;
        drawLine(x1,y1,x2,y2);

    It does not work again.
   
    At the end I suppose that there is a concept fail on the use of
drawLine but I don't know.

    PD: I use i the code because in the next step I want to draw 29
lines in a 1cm step

    Dear Colleges;

    First, I am new with ImageJ and its macro language so sorry if this
is a not interesting.

    I would like to draw a line in a centered image, i.e. the origin of
the coordinates is not the left upper corner instead is more or less the
center of the image.
    The center is at (1182,963) in a 2369x1928 image.

    When I tried the following lines the macro does not work:
           
        setColor(255, 0, 0);
        setLineWidth(1);
        i=0;  

        x1=round((i-14)*(10/0.17));
        y1=-750;
        x2=x1;
        y2=750;
        drawLine(x1,y1,x2,y2);

    Instead if I take the origin of the coordinates the left upper
corner the macro works:

       setColor(255, 0, 0);
        setLineWidth(1);
        i=0;  

        x1=round((i-14)*(10/0.17));
        y1=-750;
        x2=x1;
        y2=750;
        drawLine(x1,y1,x2,y2);

    But the if I change the 14 in the third line by 13....:

       setColor(255, 0, 0);
        setLineWidth(1);
        i=0;  

        x1=round((i-13)*(10/0.17));
        y1=-750;
        x2=x1;
        y2=750;
        drawLine(x1,y1,x2,y2);

    It does not work again.
   
    At the end I suppose that there is a concept fail on the use of
drawLine but I don't know.

    PD: I use "i" the code because in the next step I want to draw 29
lines,  i. e. I would like to use these sentences in a for loop


    Many Thanks,

--
Dr Luis Isaac Ramos Garcia
Departamento de Oncologia
Clinica Universidad de Navarra
Facultad de Medicina,Universidad de Navarra
Av. Pio XII nº36, 31008 Pamplona, Spain
Fax: [phone]
TEL: [phone] (Ext. 4924)
E-mail: [hidden email]
Web Page: http://www.cun.es