Coverage for gws-app/gws/gis/mpx/util.py: 0%

1from PIL import ImageColor, ImageDraw, ImageFont 

2from mapproxy.image import ImageSource 

3 

4# see https://mapproxy.org/docs/nightly/decorate_img.html 

5 

6def annotate(image, service, layers, environ, query_extent, **kw): 

7 img = image.as_image().convert('RGBA') 

8 

9 text = [ 

10 'service: %s' % service, 

11 'layers: %s' % ', '.join(layers), 

12 'srs: %s' % query_extent[0] 

13 ] 

14 

15 try: 

16 args = environ['mapproxy.request'].args 

17 text.append('x=%s y=%s z=%s' % ( 

18 args['tilecol'], 

19 args['tilerow'], 

20 args['tilematrix'], 

21 )) 

22 except: 

23 pass 

24 

25 for coord in query_extent[1]: 

26 text.append(' %s' % coord) 

27 

28 draw = ImageDraw.Draw(img) 

29 font = ImageFont.load_default() 

30 clr = ImageColor.getrgb('#ff0000') 

31 

32 line_y = 10 

33 for line in text: 

34 line_w, line_h = font.getsize(line) 

35 draw.text((10, line_y), line, font=font, fill=clr) 

36 line_y = line_y + line_h 

37 

38 draw.rectangle((0, 0) + img.size, outline=clr) 

39 

40 return ImageSource(img, image.image_opts) 

41 

42 

43class AnnotationFilter(object): 

44 """ 

45 Simple MapProxy decorate_img middleware. 

46 

47 Annotates map images with information about the request. 

48 """ 

49 

50 def __init__(self, app): 

51 self.app = app 

52 

53 def __call__(self, environ, start_response): 

54 # Add the callback to the WSGI environment 

55 environ['mapproxy.decorate_img'] = annotate 

56 

57 return self.app(environ, start_response)