Xtics density can be set in print and clipping

prasopes/config.py

@@ -14,9 +14,11 @@ def settings():
                ("print/xinch", 10),
                ("print/yinch", 4),
                ("print/dpi", 300),
+               ("print/xtics", 5),
                ("imggen/xinch", 10),
                ("imggen/yinch", 4),
-               ("imggen/dpi", 300)}
+               ("imggen/dpi", 300),
+               ("imggen/xtics", 5)}
     [settings.setValue(i[0], i[1]) for i in defvals if settings.value(i[0]) == None]
     return settings
 
@@ -84,6 +86,8 @@ def dial(parent):
         "Figure height (inch)", "print/yinch", config))
     printlayout.addLayout(posintvarconf(
         "Figure dpi", "print/dpi", config))
+    printlayout.addLayout(posintvarconf(
+        "Figure x axis major ticks count", "print/xtics", config))
     tabs.addTab(printtab, "Printing")
 
     imggentab = QtWidgets.QWidget()
@@ -94,6 +98,8 @@ def dial(parent):
         "Figure height (inch)", "imggen/yinch", config))
     imggenlayout.addLayout(posintvarconf(
         "Figure dpi", "imggen/dpi", config))
+    imggenlayout.addLayout(posintvarconf(
+        "Figure x axis major ticks count", "imggen/xtics", config))
     tabs.addTab(imggentab, "Image clip/export")
 
     close_button = QtWidgets.QPushButton("Close")

prasopes/imagetools.py

@@ -13,11 +13,11 @@ import prasopes.config as cf
 def paint_image(mass_spec, spect, painttarget=None):
     """generates QImage from mass spectrum"""
     if isinstance(painttarget, type(QtPrintSupport.QPrinter())):
-        xinch, yinch, dpi = [cf.settings().value(
-            "print/{}".format(i), type=int) for i in ("xinch", "yinch", "dpi")]
+        xinch, yinch, dpi, xtics = [cf.settings().value("print/{}".format(i),
+            type=int) for i in ("xinch", "yinch", "dpi", "xtics")]
     else:
-        xinch, yinch, dpi = [cf.settings().value(
-            "imggen/{}".format(i), type=int) for i in ("xinch", "yinch", "dpi")]
+        xinch, yinch, dpi, xtics = [cf.settings().value("imggen/{}".format(i),
+            type=int) for i in ("xinch", "yinch", "dpi", "xtics")]
     paintfig = Figure(figsize=(xinch, yinch), dpi=dpi)
     canvas = FigureCanvas(paintfig)
     printplot = paintfig.add_subplot(111)
@@ -28,6 +28,7 @@ def paint_image(mass_spec, spect, painttarget=None):
         mspect = mass_spec.copy()
         mspect['y'] = yline
         gt.pop_plot(printplot,mspect)
+    printplot.locator_params(nbins=xtics, axis='x')
     cache_file = BytesIO()
     paintfig.savefig(cache_file)
     cache_file.seek(0)