Waggawaggawaggawagga animated ducks in QGIS

I used ne_110m_admin_0_countries.

Rendering updates for the layer at 0.1 seconds.

Geometry Generator for a Point for the marker location via line_interpolate_point:

with_variable(
  'biggest_geom',
  geometry_n(order_parts($geometry, 'area($geometry)', ascending:=False), 1),
  line_interpolate_point(
    boundary(@biggest_geom), 
    perimeter(@biggest_geom)*(round(epoch(now())/100)%100/100)
  )
)

Raster Image Marker with https://opengameart.org/content/character-spritesheet-duck, vertical anchor at bottom, sprite choice between walking and running (doesn’t actually work) plus the frame via

with_variable(
  'biggest_geom',
  geometry_n(order_parts($geometry, 'area($geometry)', ascending:=False), 1),
  '/your/path/Duck/Sprites/Walking-Running/'
  || if(perimeter(@biggest_geom) < 10, 'Walking', 'Running')
  || ' 00'
  || to_string(round(epoch(now())/200)%2+1)
  || '.png'
)

Rotation did not work, I tried line_interpolate_angle:

with_variable(
  'biggest_geom',
  geometry_n(order_parts($geometry, 'area($geometry)', ascending:=False), 1),
  line_interpolate_angle(
    boundary(@biggest_geom), 
    perimeter(@biggest_geom)*(round(epoch(now())/100)%100/100)
  )
)

Steps via two more Geometry Generators, both for Lines using line_substring and some nice style (inspired by the wonderful built-in cat trail preset):

with_variable(
	'biggest_geom',
	geometry_n(order_parts($geometry, 'area($geometry)', ascending:=False), 1),
  	line_substring(
	  boundary(@biggest_geom), 
	  0,
	  perimeter(@biggest_geom)*(round(epoch(now())/100)%100/100)
	)
)

Could be improved if (for example) Raster Image Marker would support:

  • Choice of resampling algorithm
  • Flipping
  • Rotation would work, no idea what’s wrong with my expression, it works with random values, so …
  • Whatever is broken with the choice between ‘Walking’ and ‘Running’ in the file path expression

2 thoughts on “Waggawaggawaggawagga animated ducks in QGIS

  1. Pavel

    Good afternoon!
    Please tell me why you need to use ‘geometry_n(order_parts($geometry, ‘parea($geometry)’, ascending:=False), 1)’. Why can’t ‘$geometry’

    Reply
    1. Hannes Post author

      Ha, good question. That was just for the dataset I used which had Multipolygons and I needed to make sure only one Polygon is used. You can drop the whole with_variable context if you just have non-multi Polygons.

      Reply

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