I've just realized there is an analogous lack in 2d.
If I were able to draw filled triangles I could virtually draw any (polygon) shape ...
example:
2d_fill_color 0,255,0
2d_circle 100,100,50
2d_fill_color 0,0,255
2d_rectangle 200,200,70,130
' and what about triangles?
2d_fill_color 255,0,0
' 2d_triangle 150,150,200,300,250,100 won't work, :-(
2d_poly_from 150,150
2d_poly_to 200,300
2d_poly_to 250,100
2d_poly_to 150,150
' I cannot fill them, can I?