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Thread: QwtPlot3D: how to cope with such a thing (picture inside)

  1. 28th December 2009, 11:03 #1
    YaK
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    Default QwtPlot3D: how to cope with such a thing (picture inside)


    How to make those lines shorter? I didn't find how to do it...
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  2. 8th January 2010, 20:03 #2
    liversedge
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    Default Re: QwtPlot3D: how to cope with such a thing (picture inside)

    See: http://sourceforge.net/projects/qwtp.../topic/3266089

    You can set the tic length for each axis X1,X2,X3,X4,Y1,Y2,Y3,Y4,Z1,Z2,Z3,Z4 but take care to use the world coordinates. You shoukd be mindful of the current scaling for X/Y/Z (setScale) and set the tic length according to the tic orientation (setTicOrientation).

    Its a bit fiddly but you'll get there in the end, here is an example from my code (xscale/yscale/zscale are factors that are used to scale each dimension, are doubles and have values as diverse as 0.001 through 1000.

    Qt Code: 
    1. plot.setScale(xscale, yscale, zscale);
    2.     plot.coordinates()->axes[Z1].setTicLength(25.0/xscale, 10.0/xscale);
    3.     plot.coordinates()->axes[Z2].setTicLength(25.0/xscale, 10.0/xscale);
    4.     plot.coordinates()->axes[Z3].setTicLength(25.0/xscale, 10.0/xscale);
    5.     plot.coordinates()->axes[Z4].setTicLength(25.0/xscale, 10.0/xscale);
    6.     plot.coordinates()->axes[X1].setTicLength(25.0/yscale, 10.0/yscale);
    7.     plot.coordinates()->axes[X2].setTicLength(25.0/yscale, 10.0/yscale);
    8.     plot.coordinates()->axes[X3].setTicLength(25.0/yscale, 10.0/yscale);
    9.     plot.coordinates()->axes[X4].setTicLength(25.0/yscale, 10.0/yscale);
    10.     plot.coordinates()->axes[Y1].setTicLength(25.0/xscale, 10.0/xscale);
    11.     plot.coordinates()->axes[Y2].setTicLength(25.0/xscale, 10.0/xscale);
    12.     plot.coordinates()->axes[Y3].setTicLength(25.0/xscale, 10.0/xscale);
    13.     plot.coordinates()->axes[Y4].setTicLength(25.0/xscale, 10.0/xscale);
    14.     plot.coordinates()->axes[X1].setTicOrientation(0, -1, 0);
    15.     plot.coordinates()->axes[X2].setTicOrientation(0, -1, 0);
    16.     plot.coordinates()->axes[X3].setTicOrientation(0,  1, 0);
    17.     plot.coordinates()->axes[X4].setTicOrientation(0,  1, 0);
    18.     plot.coordinates()->axes[Y1].setTicOrientation( 1, 0, 0);
    19.     plot.coordinates()->axes[Y2].setTicOrientation(-1, 0, 0);
    20.     plot.coordinates()->axes[Y3].setTicOrientation(-1, 0, 0);
    21.     plot.coordinates()->axes[Y4].setTicOrientation( 1, 0, 0);
    22.     plot.coordinates()->axes[Z1].setTicOrientation( 1, 0, 0);
    23.     plot.coordinates()->axes[Z2].setTicOrientation( 1, 0, 0);
    24.     plot.coordinates()->axes[Z3].setTicOrientation(-1, 0, 0);
    25.     plot.coordinates()->axes[Z4].setTicOrientation(-1, 0, 0);
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    In fact perhaps to help, here is my code to calculate the xscale/yscale/scale, based upon minmax values

    Qt Code: 
    1. double xscale, yscale, zscale;
    2.  
    3.     if ((maxbinx-minbinx) >= (maxbiny-minbiny) && (maxbinx-minbinx) >= (maxz-minz)) {
    4.         // scale is set off the x-axis
    5.         xscale = 1;
    6.         yscale = (maxbinx-minbinx)/(maxbiny-minbiny);
    7.         zscale = (maxbinx-minbinx)/(maxz-minz);
    8.     } else if ((maxbiny-minbiny) >= (maxbinx-minbinx) && (maxbiny >= minbiny) >= (maxz-minz)) {
    9.         // scale is set off the y-axis
    10.         xscale = (maxbiny-minbiny)/(maxbinx-minbinx);
    11.         yscale = 1;
    12.         zscale = (maxbiny-minbiny)/(maxz-minz);
    13.     } else {
    14.         // scale is set off the z-axis
    15.         xscale = (maxz-minz)/(maxbinx-minbinx);
    16.         yscale = (maxz-minz)/(maxbiny-minbiny);
    17.         zscale = 1;
    18.     }
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  3. The following user says thank you to liversedge for this useful post:

    olaks (28th January 2010)
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