drawing.py 文件源码

def text_block(ctx, obj, text, font, lang="en-US", debug=False):
    ctx.save()

    lyt = PangoCairo.create_layout(ctx)
    pg_ctx = lyt.get_context()
    pg_ctx.set_language(Pango.Language.from_string(lang))

    fo = cairo.FontOptions()
    fo.set_antialias(cairo.ANTIALIAS_SUBPIXEL)
    PangoCairo.context_set_font_options(pg_ctx, fo)
    font_family = font.family if not font.replace else font.replace
    pg_font = Pango.FontDescription("{} {}px".format(font_family, font.size))
    lyt.set_font_description(pg_font)
    lyt.set_markup(text, -1) # force length calculation

    lyt.set_height(obj.height * Pango.SCALE * 1.5) # TODO what?
    lyt.set_width(obj.width * Pango.SCALE)
    lyt.set_alignment(Pango.Alignment.CENTER)
    #PangoCairo.update_layout(ctx, lyt)

    pg_size = lyt.get_pixel_size()
    ink, logical = lyt.get_pixel_extents()

    while ink.height > obj.height and pg_font.get_size() > 0:
        pg_font.set_size(pg_font.get_size() - Pango.SCALE)
        lyt.set_font_description(pg_font)
        ink, logical = lyt.get_pixel_extents()

    #x = obj["x"] - pext.x - pext.width / 2
    #y = obj["y"] - pext.y - pext.height / 2
    x = (obj.x + obj.width / 2) - ((ink.x + ink.width / 2))
    y = (obj.y + obj.height / 2) - ((ink.y + ink.height / 2))
    #x = obj["x"]
    #y = obj["y"]
    if debug:
        print("x,y: %s, %s" % (x, y))
    ctx.translate(x, y)

    PangoCairo.update_layout(ctx, lyt)
    PangoCairo.layout_path(ctx, lyt)
    ctx.set_line_width(9.0)
    ctx.set_line_cap(cairo.LINE_CAP_ROUND)
    ctx.set_line_join(cairo.LINE_JOIN_ROUND)
    ctx.set_source_rgb(*font.color)
    PangoCairo.show_layout(ctx, lyt)

    ctx.new_path()
    ctx.restore()

    if debug:
        rectangle(ctx, ink.x, ink.y, ink.width, ink.height, True, 2.0, (0, 1, 0))
        rectangle(ctx, obj.x, obj.y, obj.width, obj.height, True, 2.0, (0.8, 0.8, 0))