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<p>Does it works on Layers with no geometry?</p>
<p>My layers do not have a geometry.</p>
<p><br>
</p>
<div class="moz-cite-prefix">Am 13.11.2020 um 11:56 schrieb Andreas
Neumann:<br>
</div>
<blockquote type="cite"
cite="mid:80d2b9f3-0896-999d-a5ab-17ad4573d522@carto.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Yes, you need point data to start from, but then vectors can
bei/are generated from the attributes you mentioned.</p>
<p>Andreas<br>
</p>
<div class="moz-cite-prefix">Am 13.11.20 um 11:47 schrieb L.W.:<br>
</div>
<blockquote type="cite"
cite="mid:cd1f5b7c-4703-530f-d5b7-b51caa5632d5@gmx.de">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>from the docs ...</p>
<p>****It can only be used to render point data****</p>
<h4 style="box-sizing: border-box; margin-top: 0px; font-weight:
700; font-family: "Roboto Slab", ff-tisa-web-pro,
Georgia, Arial, sans-serif; font-size: 18.4px; color: rgb(64,
64, 64); font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-stroke-width: 0px; background-color: rgb(252,
252, 252); text-decoration-style: initial;
text-decoration-color: initial;"><a class="toc-backref"
href="https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#id15"
style="box-sizing: border-box; color: rgb(64, 64, 64);
text-decoration: none; cursor: pointer; outline-width: 0px
!important; user-select: auto !important;"
moz-do-not-send="true"><span class="section-number"
style="box-sizing: border-box;">12.2.2.2.6.<span> </span></span>The
Vector Field Marker</a></h4>
<p class="" style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px 0px 24px; color: rgb(64, 64, 64);
font-family: Lato, proxima-nova, "Helvetica Neue",
Arial, sans-serif; font-style: normal; font-variant-ligatures:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(252, 252, 252); text-decoration-style:
initial; text-decoration-color: initial;">The vector field
marker is used to display vector field data such as earth
deformation, tidal flows, and the like. It displays the
vectors as lines (preferably arrows) that are scaled and
oriented according to selected attributes of data points.
****It can only be used to render point data****; line and
polygon layers are not drawn by this symbology.</p>
<p style="box-sizing: border-box; line-height: 24px; font-size:
16px; margin: 0px 0px 24px; color: rgb(64, 64, 64);
font-family: Lato, proxima-nova, "Helvetica Neue",
Arial, sans-serif; font-style: normal; font-variant-ligatures:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(252, 252, 252); text-decoration-style:
initial; text-decoration-color: initial;">The vector field is
defined by attributes in the data, which can represent the
field either by:</p>
<ul class="simple" style="box-sizing: border-box; margin: 0px
0px 24px; padding: 0px; list-style: disc; line-height: 24px;
color: rgb(64, 64, 64); font-family: Lato, proxima-nova,
"Helvetica Neue", Arial, sans-serif; font-size:
16px; font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: 2; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(252, 252, 252); text-decoration-style:
initial; text-decoration-color: initial;">
<li style="box-sizing: border-box; list-style: disc;
margin-left: 24px;">
<p style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px;"><strong style="box-sizing:
border-box; font-weight: 700;">cartesian</strong><span> </span>components
(<code class="docutils literal notranslate"
style="box-sizing: border-box; font-family:
SFMono-Regular, Menlo, Monaco, Consolas,
"Liberation Mono", "Courier New",
Courier, monospace; font-size: 12px; white-space:
nowrap; max-width: 100%; background: rgb(255, 255, 255);
border: 1px solid rgb(225, 228, 229); padding: 2px 5px;
color: rgb(231, 76, 60); overflow-x: auto;"><span
class="pre" style="box-sizing: border-box;">x</span></code><span> </span>and<span> </span><code
class="docutils literal notranslate" style="box-sizing:
border-box; font-family: SFMono-Regular, Menlo, Monaco,
Consolas, "Liberation Mono", "Courier
New", Courier, monospace; font-size: 12px;
white-space: nowrap; max-width: 100%; background:
rgb(255, 255, 255); border: 1px solid rgb(225, 228,
229); padding: 2px 5px; color: rgb(231, 76, 60);
overflow-x: auto;"><span class="pre" style="box-sizing:
border-box;">y</span></code><span> </span>components
of the field)</p>
</li>
<li style="box-sizing: border-box; list-style: disc;
margin-left: 24px;">
<p style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px;">or<span> </span><strong
style="box-sizing: border-box; font-weight: 700;">polar</strong><span> </span>coordinates:
in this case, attributes define<span> </span><code
class="docutils literal notranslate" style="box-sizing:
border-box; font-family: SFMono-Regular, Menlo, Monaco,
Consolas, "Liberation Mono", "Courier
New", Courier, monospace; font-size: 12px;
white-space: nowrap; max-width: 100%; background:
rgb(255, 255, 255); border: 1px solid rgb(225, 228,
229); padding: 2px 5px; color: rgb(231, 76, 60);
overflow-x: auto;"><span class="pre" style="box-sizing:
border-box;">Length</span></code><span> </span>and<span> </span><code
class="docutils literal notranslate" style="box-sizing:
border-box; font-family: SFMono-Regular, Menlo, Monaco,
Consolas, "Liberation Mono", "Courier
New", Courier, monospace; font-size: 12px;
white-space: nowrap; max-width: 100%; background:
rgb(255, 255, 255); border: 1px solid rgb(225, 228,
229); padding: 2px 5px; color: rgb(231, 76, 60);
overflow-x: auto;"><span class="pre" style="box-sizing:
border-box;">Angle</span></code>. The angle may be
measured either clockwise from north, or Counterclockwise
from east, and may be either in degrees or radians.</p>
</li>
<li style="box-sizing: border-box; list-style: disc;
margin-left: 24px;">
<p style="box-sizing: border-box; line-height: 24px;
font-size: 16px; margin: 0px;">or as<span> </span><strong
style="box-sizing: border-box; font-weight: 700;">height
only</strong><span> </span>data, which displays a
vertical arrow scaled using an attribute of the data. This
is appropriate for displaying the vertical component of
deformation, for example.</p>
</li>
</ul>
<p style="box-sizing: border-box; line-height: 24px; font-size:
16px; margin: 0px 0px 24px; color: rgb(64, 64, 64);
font-family: Lato, proxima-nova, "Helvetica Neue",
Arial, sans-serif; font-style: normal; font-variant-ligatures:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(252, 252, 252); text-decoration-style:
initial; text-decoration-color: initial;">The magnitude of
field</p>
<p style="box-sizing: border-box; line-height: 24px; font-size:
16px; margin: 0px 0px 24px; color: rgb(64, 64, 64);
font-family: Lato, proxima-nova, "Helvetica Neue",
Arial, sans-serif; font-style: normal; font-variant-ligatures:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: 2; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(252, 252, 252); text-decoration-style:
initial; text-decoration-color: initial;"><br>
</p>
<div class="moz-cite-prefix">Am 13.11.2020 um 11:34 schrieb
Andreas Neumann:<br>
</div>
<blockquote type="cite"
cite="mid:9d5955ce-6f3b-14ba-b27c-5f409d3382cd@carto.net">Or
even easier: use the "Vector Field Marker": <br>
<br>
<a class="moz-txt-link-freetext"
href="https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#the-vector-field-marker"
moz-do-not-send="true">https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?#the-vector-field-marker</a>
<br>
<br>
Am 13.11.20 um 11:33 schrieb Andreas Neumann: <br>
<blockquote type="cite">Hi, <br>
<br>
Yes - you can use Geometry Generators for that. Use the
make_point() and make_line() expressions for that. <br>
<br>
See <a class="moz-txt-link-freetext"
href="https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?highlight=geometry%20generator#the-geometry-generator"
moz-do-not-send="true">https://docs.qgis.org/3.10/en/docs/user_manual/style_library/symbol_selector.html?highlight=geometry%20generator#the-geometry-generator</a><br>
<br>
Greetings, <br>
Andreas <br>
<br>
Am 13.11.20 um 11:26 schrieb L.W.: <br>
<blockquote type="cite">Hi, <br>
<br>
is it possible to draw automatically a line between two
points defined <br>
by 4 fields (x1,y1 - x2,y2) in an attributetable? <br>
<br>
but I do not want to add a line-layer based on this table
nor want to <br>
draw the line by hand. <br>
<br>
thanks <br>
<br>
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