specify xtick locations for pnf

Author: DanielGoldfarb

examples/scratch_pad/issues/issue568_pnf_calcs.ipynb

@@ -1573,8 +1573,9 @@ def _construct_pnf_scatter(ax,ptype,dates,xdates,opens,highs,lows,closes,volumes
     lo   = min(yvals)
     xlen = int(round((hi-lo)/box_size,0)+2) # +2 empirical kludge
     pad  = (xlen-xvals[-1]) * pointnfig_params['scale_right_padding']
-    print('hi,lo,xlen,xvals[-1],pad=',hi,lo,xlen,xvals[-1],pad)
-    print('ylim_top,ylim_bot=',ylim_top,ylim_bot)
+    pad  = max(0,pad) # less than zero not allowed
+    #print('hi,lo,xlen,xvals[-1],pad=',hi,lo,xlen,xvals[-1],pad)
+    #print('ylim_top,ylim_bot=',ylim_top,ylim_bot)
 
     xdates = np.arange(len(pnfd)+int(pad))
     pnf_volumes = pnf_volumes + [float('nan')]*int(pad)

src/mplfinance/_utils.py

@@ -707,6 +707,12 @@ def plot( data, **kwargs ):
         pnf_os = list(pnf_results['pnf_df'].OBox.values)
         tick_vals = sorted( set(pnf_xs + pnf_os) )
         axA1.set_yticks(tick_vals)
+        skip = int( round(len(xdates)/10.0, 0) )
+        skip = max(1,skip) # must be at least 1
+        tick_vals = [t for t in range(0-skip,len(xdates)+1,skip)]
+        #print('len(xdates)=',len(xdates),'len(pnf_mdates)=',len(pnf_mdates))
+        #print('skip=',skip,'\nxdates=',xdates,'\npnf_dates=',[str(d.date()) for d in mdates.num2date(pnf_mdates)])
+        axA1.set_xticks(tick_vals)
 
     ysd = config['yscale']
     if isinstance(ysd,dict):