Better Visualization Functions

[lolipopshock]

1. Not drawing the box outlines when setting box_width=0. For example,

   from PIL import Image
   import layoutparser as lp
   
   image = Image.new('RGB', (50,50), color='white')
   lp.draw_box(image, [lp.Rectangle(10, 10, 40, 40)], box_width=0)

   Previously, it will draw a box .

2. Allowing setting box_color in draw_box:

   1. directly setting box_color:

      from PIL import Image
      import layoutparser as lp
      
      image = Image.new('RGB', (50,50), color='white')
      
      lp.draw_box(image, 
                  [lp.TextBlock(lp.Rectangle(10, 10, 20, 20), type='a'), 
                  lp.TextBlock(lp.Rectangle(30, 30, 45, 45), type='b'),] ,
                  box_color=['black', 'red'])

      

   2. overriding color_map:

      lp.draw_box(image, 
                  [lp.TextBlock(lp.Rectangle(10, 10, 20, 20), type='a'), 
                  lp.TextBlock(lp.Rectangle(30, 30, 45, 45), type='b'),] ,
                  color_map={'a':'black', 'b':'blue'}, box_color=['black', 'red'])

      

3. Setting box_color, box_alpha, and box_width for each objects:

   from PIL import Image
   import layoutparser as lp
   
   image = Image.new('RGB', (50,50), color='white')
   lp.draw_box(image, 
               [lp.TextBlock(lp.Rectangle(10, 10, 20, 20), type='a'), 
               lp.TextBlock(lp.Rectangle(30, 30, 45, 45), type='b'),] ,
               box_color=['black', 'red'], 
               box_alpha=[0.1, 0.5], 
               box_width=[2,4])