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EDIT

When I use rotated horline, like @Ian Turton suggested in his answer, then I get breaks in the hatch, like on the image below. Because of this I start to use wkt symbol, I was unable to find a way to fix this

EDIT

When I use rotated horline, like @Ian Turton suggested in his answer, then I get breaks in the hatch, like on the image below. Because of this I start to use wkt symbol, I was unable to find a way to fix this

Can somebody help me with this error, it throws it when rendering an object and styling it with use of a buffer (sld style, wkt string). So I suppose that some problem is with buffering but was unable to figure out what is happening to solve it. Buffer values are mostly between -5 and -0.3. Example from sld file is bellow. Is it posible to this happens because of small values of the "Slope"?

<Rule>
    <Name>Public building</Name>
    <Title>g</Title>
    <ogc:Filter> 
        <ogc:PropertyIsEqualTo>
            <ogc:PropertyName>THEME_ID</ogc:PropertyName>
            <ogc:Literal>729</ogc:Literal> 
        </ogc:PropertyIsEqualTo> 
    </ogc:Filter> 
    <PolygonSymbolizer>
        <Geometry>
            <ogc:Function name="buffer">
                <ogc:PropertyName>the_geom</ogc:PropertyName>
                <ogc:PropertyName>Buffer</ogc:PropertyName>
            </ogc:Function>
        </Geometry>  
        <Fill>
            <GraphicFill>
                <Graphic>
                    <Mark>
                        <WellKnownName>wkt://LINESTRING(0 0, ${sin(Slope - 45) * 20000} ${cos(Slope - 45) * 20000} )</WellKnownName>
                        <Stroke>
                            <CssParameter name="stroke">
                                <ogc:PropertyName>COLOR</ogc:PropertyName>
                            </CssParameter>
                            <CssParameter name="stroke-width">2.5</CssParameter>
                        </Stroke>
                    </Mark>
                </Graphic>
            </GraphicFill>
        </Fill>
    </PolygonSymbolizer> 
    <LineSymbolizer>
        <Stroke>
            <CssParameter name="stroke">
                <ogc:PropertyName>COLOR</ogc:PropertyName>
            </CssParameter>
            <CssParameter name="stroke-width">1</CssParameter>
        </Stroke>
    </LineSymbolizer>
</Rule>

Can somebody help me with this error, it throws it when rendering an object and styling it with use of a buffer (sld style, wkt string). So I suppose that some problem is with buffering but was unable to figure out what is happening to solve it. Buffer values are mostly between -5 and -0.3. Example from sld file is bellow. Is it posible to this happens because of small values of the "Nagib"?

<Rule>
    <Name>Public building</Name>
    <Title>g</Title>
    <ogc:Filter> 
        <ogc:PropertyIsEqualTo>
            <ogc:PropertyName>THEME_ID</ogc:PropertyName>
            <ogc:Literal>729</ogc:Literal> 
        </ogc:PropertyIsEqualTo> 
    </ogc:Filter> 
    <PolygonSymbolizer>
        <Geometry>
            <ogc:Function name="buffer">
                <ogc:PropertyName>the_geom</ogc:PropertyName>
                <ogc:PropertyName>Buffer</ogc:PropertyName>
            </ogc:Function>
        </Geometry>  
        <Fill>
            <GraphicFill>
                <Graphic>
                    <Mark>
                        <WellKnownName>wkt://LINESTRING(0 0, ${sin(Nagib - 45) * 20000} ${cos(Nagib - 45) * 20000} )</WellKnownName>
                        <Stroke>
                            <CssParameter name="stroke">
                                <ogc:PropertyName>COLOR</ogc:PropertyName>
                            </CssParameter>
                            <CssParameter name="stroke-width">2.5</CssParameter>
                        </Stroke>
                    </Mark>
                </Graphic>
            </GraphicFill>
        </Fill>
    </PolygonSymbolizer> 
    <LineSymbolizer>
        <Stroke>
            <CssParameter name="stroke">
                <ogc:PropertyName>COLOR</ogc:PropertyName>
            </CssParameter>
            <CssParameter name="stroke-width">1</CssParameter>
        </Stroke>
    </LineSymbolizer>
</Rule>