spec/transparency.py

   1 import sys
   2 from pdflib_py import *
   3 from math import sin,cos
   4 import Image
   5 import ImageDraw
   6
   7 img = Image.new("L", (3, 3))
   8 draw = ImageDraw.Draw(img)
   9 draw.point((0,1), fill=255)
  10 draw.point((0,2), fill=255)
  11 draw.point((1,0), fill=255)
  12 draw.point((1,2), fill=255)
  13 draw.point((2,0), fill=255)
  14 draw.point((2,1), fill=255)
  15 img.save("/tmp/mask1.png")
  16
  17 img = Image.new("L", (16, 1))
  18 draw = ImageDraw.Draw(img)
  19 for i in range(16):
  20     draw.point((i,0), fill=i*16)
  21 img.save("/tmp/mask2.png")
  22
  23 img = Image.new("RGB", (3, 3))
  24 draw = ImageDraw.Draw(img)
  25 draw.point((0,1), fill=(0,0,0))
  26 draw.point((0,2), fill=(255,0,0))
  27 draw.point((1,0), fill=(0,255,0))
  28 draw.point((1,2), fill=(0,0,255))
  29 draw.point((2,0), fill=(255,255,0))
  30 draw.point((2,1), fill=(0,255,255))
  31 img.save("/tmp/img1.png")
  32
  33 img = Image.new("RGB", (16, 1))
  34 draw = ImageDraw.Draw(img)
  35 for i in range(16):
  36     draw.point((i,0), fill=(0,255,0))
  37 img.save("/tmp/img2.png")
  38
  39 p = PDF_new()
  40 PDF_open_file(p, "transparency.pdf")
  41 font = PDF_load_font(p, "Helvetica", "host", "")
  42
  43 PDF_set_parameter(p, "usercoordinates", "true")
  44
  45 width = 400
  46 height = 400
  47 PDF_begin_page(p, width, height)
  48
  49 PDF_setcolor(p, "fill", "rgb", 0.0,0.0,0.0,1.0)
  50 PDF_moveto(p, 0,0)
  51 PDF_lineto(p, width, 0)
  52 PDF_lineto(p, width, height)
  53 PDF_lineto(p, 0, height)
  54 PDF_lineto(p, 0, 0)
  55 PDF_fill(p)
  56
  57 PDF_setfont(p, font, 10.0)
  58 PDF_setcolor(p, "fill", "rgb", 1.0,1.0,1.0,1.0)
  59 PDF_set_text_pos(p, 50, 205);PDF_show(p, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
  60 PDF_set_text_pos(p, 50, 105);PDF_show(p, "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz")
  61
  62 mask = PDF_load_image(p, "png", "/tmp/mask1.png", "mask")
  63 i = PDF_load_image(p, "png", "/tmp/img1.png", "masked "+str(mask))
  64 PDF_place_image(p, i, 100, 300, 20)
  65
  66 mask2 = PDF_load_image(p, "png", "/tmp/mask2.png", "mask")
  67 i2 = PDF_load_image(p, "png", "/tmp/img2.png", "masked "+str(mask2))
  68 PDF_place_image(p, i2, 0, 200, 25)
  69
  70 PDF_setcolor(p, "fill", "rgb", 1.0,1.0,1.0,1.0)
  71 gstate = PDF_create_gstate(p, "opacityfill 0.25") # blendmode multiply opacityfill 0.5")
  72 PDF_set_gstate(p, gstate)
  73 PDF_moveto(p, 50, 75)
  74 PDF_lineto(p, 50+300, 75)
  75 PDF_lineto(p, 50+300, 150)
  76 PDF_lineto(p, 50, 150)
  77 PDF_lineto(p, 50, 75)
  78 PDF_fill(p)
  79
  80 PDF_end_page(p)
  81 PDF_close(p)
  82 PDF_delete(p);