Should shape_mode() affect drawing of "converted" Py5Shape objects?

[villares]

I wonder if this is by design and I'm missing something. Can you folks have a look?

I was expecting the shape I generated from py5.convert_shape(a_shapely_object) to be drawn "from center" when using py5.shape_mode(py5.CENTER). But it doesn't seem to be affected by it.

On the other hand, the behavior we get is drawing from the converted shape's "insertion point", that is, from the shape's internal origin coordinates, which might not be what one expects if one calls py5.CORNER mode either (and I wouldn't want to loose this "from shape's origin" option).

import py5
import shapely

def setup():
    py5.size(200, 200)
    s = 3
    lines = []
    for i in range(30):
        x = i * s
        y = 100 - i * s
        lines.append(shapely.LineString(((x * 0.8, y * 1.3),
                                         (x * 1.4 + 100, y * 0.5 + 100))))
    clipped = clip_rect(lines, 50, 50, 80, 80)
    shp = py5.convert_shape(clipped)
    
    py5.shape_mode(py5.CENTER)  # note this...
    
    py5.shape(shp, 100, 100)  # seemingly drawn from corner, but also it's the "shape origin"
    
    other = py5.create_shape()
    other.begin_shape()
    other.vertex(0, 0)
    other.vertex(80, 0)
    other.vertex(80, 80)
    other.vertex(0, 80)
    other.end_shape(py5.CLOSE)    
    py5.shape(other, 100, 100)  # drawn as expected, centered
    
    py5.save_frame('out.png')

def clip_rect(shapes, x, y, w, h):
    global rect
    collection = shapely.GeometryCollection(shapes)
    rect = shapely.Polygon(((x, y), (x + w, y), (x + w, y + h), (x, y + h)))
    intersection = rect.intersection(collection)
    return shapely.affinity.translate(intersection, -x, -y) # translate to origin
    
py5.run_sketch(block=False)

[hx2A]

I see what you are saying here. It might be because shp is a group shape, and Processing is not able to correctly ascertain the center? Can you try the analogous sketch in Processing and see if it also has this issue? Also, can you try moving the shape_mode() call to before convert_shape(), and see if that makes a difference?

[villares]

Moving py5.shape_mode(py5.CENTER) before py5.convert_shape() has no effect.
I think you nailed it, @hx2A, groups are not affected!

[villares]

I'm not 100% sure I got this right, but I decided to open a documentation issue at the Processing documentation (website repo) processing/processing-website#625

[hx2A]

Interesting, and good idea to open an issue w/ Processing. Let's see what they say and we can also update py5's documentation as well.

In your opened issue, can you include the code as text so someone reading it can copy-paste it and experiment with it themselves?