Support width parameter for `pygame.draw.aalines`

[FeldrinH]

Currently all the line drawing functions (pygame.draw.line, pygame.draw.lines, pygame.draw.aaline) support a width parameter, with one notable exception: pygame.draw.aalines. It would be nice if aalines also supported the width parameter, so there would be a convenient method to draw wide antialiased polylines.

[Fantastair]

I took a look at the implementation code for draw.aalines() and draw.aaline(). The underlying drawing function called by aaline() is draw_aaline_width(), while aalines() calls draw_aaline().

/* src_c/draw.c */

static void
draw_aaline_width(SDL_Surface *surf, SDL_Rect surf_clip_rect,
                  PG_PixelFormat *surf_format, Uint32 color, float from_x,
                  float from_y, float to_x, float to_y, int width,
                  int *drawn_area)
{...}

static void
draw_aaline(SDL_Surface *surf, SDL_Rect surf_clip_rect,
            PG_PixelFormat *surf_format, Uint32 color, float from_x,
            float from_y, float to_x, float to_y, int *drawn_area,
            int disable_first_endpoint, int disable_second_endpoint,
            int extra_pixel_for_aalines)
{...}

Compared to draw_aaline_width(), draw_aaline() lacks the width parameter but includes three additional parameters: disable_first_endpoint, disable_second_endpoint, and extra_pixel_for_aalines. It appears that aalines() was originally designed for a 1-pixel width, which is why these three parameters are used to control the pixel connection details at the endpoints.