Nodeview ui test

Created by: zeffii

some ui love.

todo, related

• nodes\number\easing.py:
• nodes\viz\console_node.py:
• nodes\viz\viewer_2d.py:
• nodes\viz\viewer_texture.py:
• nodes\viz\viewer_texture_lite.py:
• nodes\viz\viewer_waveform_output.py:
• ui\bgl_callback_nodeview.py:
• utils\exception_drawing_with_bgl.py:

each of those nodes must implement a function that calculates the desired X, Y location to start drawing. My preference is that the function is created outside of the node class, called with a reference to the node.

def get_dynamic_xy_for_2d_drawing(node):
    """
    take into account the node's absolute location
    take into account the node's current width
    apply any x, y offset
    apply any scaling to the final x, y
    """
    x = ...
    y = ...
    return x, y

something like the easing function would replace the loc entry with a function

            draw_data = {
                'mode': 'custom_function',
                'tree_name': self.id_data.name[:],
-               'loc': (x, y),
+               'node_name': self.name[:],
+               'loc': get_dynamic_xy_for_2d_drawing,
                'custom_function': simple28_grid_xy,
                'args': (geom, config)
            }
            nvBGL.callback_enable(n_id, draw_data)