Re: mouse pan and zoom

[James R. V. Z. <jr...@co...>]

> Tatsuro MATSUOKA <tma...@ya...> writes:
>
>> I have built wgnuplot with wxt on the cvs trees
>> 2009-07-18  Ethan A Merritt  <merritt@u.washington.edu>
>>
>>	   * src/wxterminal/wxt_gui.cpp src/wxterminal/wxt_gui.h:
>>	   Pass through mouse wheel events from the wxt terminal, so that the new
>>	   pan and zoom works for wxt as well as x11.
>
>   I have confirmed that  pan and zoom using work on wxt but does not work on windows terminal.

Thanks for checking this out.  

In the mean time I've found a simpler approach:

 if (modifier_mask & Mod_Shift) {
    /* scroll left */
    xmin = AXIS_DE_LOG_VALUE(FIRST_X_AXIS,1.1*axis_array[FIRST_X_AXIS].min 
                                          -.1*axis_array[FIRST_X_AXIS].max);
    ymin = AXIS_DE_LOG_VALUE(FIRST_Y_AXIS,axis_array[FIRST_Y_AXIS].min);
    x2min = AXIS_DE_LOG_VALUE(SECOND_X_AXIS,1.1*axis_array[SECOND_X_AXIS].min 
                                            -.1*axis_array[SECOND_X_AXIS].max);
    y2min = AXIS_DE_LOG_VALUE(SECOND_Y_AXIS,axis_array[SECOND_Y_AXIS].min);
    
    xmax = AXIS_DE_LOG_VALUE(FIRST_X_AXIS,.1*axis_array[FIRST_X_AXIS].min 
                                         +.9*axis_array[FIRST_X_AXIS].max);
    ymax = AXIS_DE_LOG_VALUE(FIRST_Y_AXIS,axis_array[FIRST_Y_AXIS].max);
    x2max = AXIS_DE_LOG_VALUE(SECOND_X_AXIS,.1*axis_array[SECOND_X_AXIS].min 
                                           +.9*axis_array[SECOND_X_AXIS].max);
    y2max = AXIS_DE_LOG_VALUE(SECOND_Y_AXIS,axis_array[SECOND_Y_AXIS].max);
    do_zoom(xmin, ymin, x2min, y2min, xmax, ymax, x2max, y2max);
    if (display_ipc_commands()) {
      fprintf(stderr, "scroll left.\n");
    }
 } 

Since this doesn't involve MousePosToGraphPosReal(), it works even for
splot.  I don't know whether this change would affect the other terminals.

I haven't checked in this change because I found a bug: If I plot a
function defined only for certain values of Y, and set logscale Y, and
scroll past the defined region, then it breaks.  E.g.

  set logscale y;set xrange [0:5];set yrange [.01:10];
  splot sqrt(1.02-(1- x)**2 - (1-y)**2)

I haven't diagnosed that problem yet.

        - Jim Van Zandt