#! /usr/bin/env python
import sys
import cairo
import math

WIDTH = 400
HEIGHT = 300

def draw_text(cr):
    cr.translate(100, 100)
    cr.select_font_face ("Code 2000",
                         cairo.FONT_SLANT_NORMAL,
                         cairo.FONT_WEIGHT_NORMAL)
    cr.set_font_size (100)
    utf8 = u"\N{LEFT SQUARE BRACKET EXTENSION}".encode("utf-8")
    x_bearing, y_bearing, width, height, x_advance, y_advance = cr.text_extents (utf8)
    cr.rectangle(0, 0, width, height)
    cr.set_source_rgb(1, .5, .5)
    cr.set_line_width(1)
    cr.stroke()
    cr.move_to(-x_bearing, -y_bearing)
    cr.set_source_rgb(0, 0, 0)
    cr.show_text(utf8)

    ## add a dot at the end of the advance vector
    cr.new_path()
    cr.arc(x_advance, height + y_advance, 10, 0, 2*math.pi)
    cr.set_source_rgb(1, .5, .5)
    cr.fill()

def main(argv):
    if len(argv) != 2:
        print >> sys.stderr, "Usage: %s OUTPUT_BASENAME\n" % sys.argv[0]
        return 1

    filename = argv[1]
    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
    cr = cairo.Context(surface)
    cr.set_source_rgb(1.0, 1.0, 1.0)
    cr.rectangle(0, 0, WIDTH, HEIGHT)
    cr.fill()
    draw_text(cr)

    surface.write_to_png(filename + ".png")

    ## output also a PDF file
    surface = cairo.PDFSurface(filename + ".pdf", WIDTH, HEIGHT)
    cr = cairo.Context(surface)
    draw_text(cr)
    cr.show_page()
    surface.finish()
    

if __name__ == '__main__':
    sys.exit(main(sys.argv))