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I am trying to style a line using marker line option. When I am using styling the line in the style window everything looks nice as you can see on the print screen bellow.

line layer properties

I am using three line features (units are mm):

  • simple line: dash pattern 7 2
  • marker line: interval 9
  • marker line: interval 9, offset 5

However the result in QGIS looks horrible as shown on the next picture. Could somebody tell me how to avoid this? It looks like QGIS is not properly listening to the dash pattern and interval settings.

QGIS result

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8
  • I guess the rotation and xy offset of the marker does not work when the line is not parallel to X or Y. Can you try a marker without rotation and offset? – AndreJ Oct 21 '14 at 9:43
  • Is your error scale dependent? Does it worsen/correct itself on different map scales? – til_b Oct 21 '14 at 9:46
  • To AndreJ: unfortunatelly it does not work even when I don't use any rotation or offset – Mary Oct 21 '14 at 10:05
  • To til_b: it remains the same on different scales – Mary Oct 21 '14 at 10:06
  • Are those lines a single feature? – Joseph Oct 21 '14 at 10:27
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Well, this is not the perfect solution, but I created SVG marker with the required symbology.

SVG marker

Then I set the needed interval and finally it works how I want!

Final result

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1

I took the same style values as you, and it looks quite good:

enter image description here

but it looks better with a svg symbol. With the standard > I get this:

enter image description here

The saved style looks as follows:

  <renderer-v2 symbollevels="0" type="singleSymbol">
    <symbols>
      <symbol alpha="1" type="line" name="0">
        <layer pass="0" class="SimpleLine" locked="0">
          <prop k="capstyle" v="square"/>
          <prop k="color" v="99,5,130,255"/>
          <prop k="customdash" v="7;2"/>
          <prop k="customdash_map_unit_scale" v="0,0"/>
          <prop k="customdash_unit" v="MM"/>
          <prop k="draw_inside_polygon" v="0"/>
          <prop k="joinstyle" v="bevel"/>
          <prop k="offset" v="0"/>
          <prop k="offset_map_unit_scale" v="0,0"/>
          <prop k="offset_unit" v="MM"/>
          <prop k="penstyle" v="solid"/>
          <prop k="use_custom_dash" v="1"/>
          <prop k="width" v="0.26"/>
          <prop k="width_map_unit_scale" v="0,0"/>
          <prop k="width_unit" v="MM"/>
        </layer>
        <layer pass="0" class="MarkerLine" locked="0">
          <prop k="interval" v="9"/>
          <prop k="interval_map_unit_scale" v="0,0"/>
          <prop k="interval_unit" v="MM"/>
          <prop k="offset" v="0"/>
          <prop k="offset_along_line" v="0"/>
          <prop k="offset_along_line_map_unit_scale" v="0,0"/>
          <prop k="offset_along_line_unit" v="MM"/>
          <prop k="offset_map_unit_scale" v="0,0"/>
          <prop k="offset_unit" v="MM"/>
          <prop k="placement" v="interval"/>
          <prop k="rotate" v="1"/>
          <symbol alpha="1" type="marker" name="@0@1">
            <layer pass="0" class="SimpleMarker" locked="0">
              <prop k="angle" v="0"/>
              <prop k="color" v="255,0,0,255"/>
              <prop k="color_border" v="0,0,0,255"/>
              <prop k="horizontal_anchor_point" v="1"/>
              <prop k="name" v="arrowhead"/>
              <prop k="offset" v="0,0"/>
              <prop k="offset_map_unit_scale" v="0,0"/>
              <prop k="offset_unit" v="MM"/>
              <prop k="outline_style" v="solid"/>
              <prop k="outline_width" v="0"/>
              <prop k="outline_width_map_unit_scale" v="0,0"/>
              <prop k="outline_width_unit" v="MM"/>
              <prop k="scale_method" v="area"/>
              <prop k="size" v="2"/>
              <prop k="size_map_unit_scale" v="0,0"/>
              <prop k="size_unit" v="MM"/>
              <prop k="vertical_anchor_point" v="1"/>
            </layer>
          </symbol>
        </layer>
        <layer pass="0" class="MarkerLine" locked="0">
          <prop k="interval" v="9"/>
          <prop k="interval_map_unit_scale" v="0,0"/>
          <prop k="interval_unit" v="MM"/>
          <prop k="offset" v="0"/>
          <prop k="offset_along_line" v="5"/>
          <prop k="offset_along_line_map_unit_scale" v="0,0"/>
          <prop k="offset_along_line_unit" v="MM"/>
          <prop k="offset_map_unit_scale" v="0,0"/>
          <prop k="offset_unit" v="MM"/>
          <prop k="placement" v="interval"/>
          <prop k="rotate" v="1"/>
          <symbol alpha="1" type="marker" name="@0@2">
            <layer pass="0" class="SimpleMarker" locked="0">
              <prop k="angle" v="0"/>
              <prop k="color" v="255,0,0,255"/>
              <prop k="color_border" v="0,0,0,255"/>
              <prop k="horizontal_anchor_point" v="1"/>
              <prop k="name" v="arrowhead"/>
              <prop k="offset" v="0,0"/>
              <prop k="offset_map_unit_scale" v="0,0"/>
              <prop k="offset_unit" v="MM"/>
              <prop k="outline_style" v="solid"/>
              <prop k="outline_width" v="0"/>
              <prop k="outline_width_map_unit_scale" v="0,0"/>
              <prop k="outline_width_unit" v="MM"/>
              <prop k="scale_method" v="area"/>
              <prop k="size" v="2"/>
              <prop k="size_map_unit_scale" v="0,0"/>
              <prop k="size_unit" v="MM"/>
              <prop k="vertical_anchor_point" v="1"/>
            </layer>
          </symbol>
        </layer>
      </symbol>
    </symbols>
    <rotation/>
    <sizescale scalemethod="area"/>
  </renderer-v2>
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