QGIS 2.4.0 marker line interval does not work properly when line is bending

Question

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.

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.

Answer 1

Well, this is not the perfect solution, but I created SVG marker with the required symbology.

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

Answer 2

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

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

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>