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= Beispiele = | = Beispiele = | ||
== Cairo - erstelle ein pdf in python == | == Cairo - erstelle ein pdf in python == | ||
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| + | folgender Code | ||
| + | * erstellt eine pdf Datei ''pdf_output'', | ||
| + | * liest ein Bild ''imagename'' ein | ||
| + | * positioniert dieses auf der ersten Seite | ||
| + | * nimmt das eingelesene Bild und positioniert es als Referenz auf ''pdf_pages'' Seiten | ||
| + | |||
<source lang="python"> | <source lang="python"> | ||
#!/usr/bin/env python | #!/usr/bin/env python | ||
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try: | try: | ||
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pdf_output = 'test.pdf' | pdf_output = 'test.pdf' | ||
| + | pdf_pages =430 | ||
pdf_width = 596.590909091 | pdf_width = 596.590909091 | ||
pdf_height = 843.75 | pdf_height = 843.75 | ||
imagename = '/home/dev/CairoSVG/img_65.jpg' | imagename = '/home/dev/CairoSVG/img_65.jpg' | ||
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image_x = 0 | image_x = 0 | ||
image_y = 0 | image_y = 0 | ||
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print '- erstelle pdf', pdf_output, 'w:', pdf_width, 'h:', pdf_height | print '- erstelle pdf', pdf_output, 'w:', pdf_width, 'h:', pdf_height | ||
cairo_surface = cairo.PDFSurface(pdf_output, pdf_width, pdf_height) | cairo_surface = cairo.PDFSurface(pdf_output, pdf_width, pdf_height) | ||
| + | print ' ... ', cairo_surface | ||
| − | print '- lese Bild ', imagename | + | print '- lese Bild von Datei ', imagename |
| − | input_ = open(imagename, 'rb') | + | input_ = open(imagename, 'rb') |
image_bytes = input_.read() | image_bytes = input_.read() | ||
from io import BytesIO | from io import BytesIO | ||
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Image.open(BytesIO(image_bytes)).save(png_file, 'PNG') | Image.open(BytesIO(image_bytes)).save(png_file, 'PNG') | ||
png_file.seek(0) | png_file.seek(0) | ||
| + | print ' ... ', png_file | ||
| + | print '- lade Bild in Cairobiliothek' | ||
image_surface = cairo.ImageSurface.create_from_png(png_file) | image_surface = cairo.ImageSurface.create_from_png(png_file) | ||
| − | image_width_original = image_surface.get_width() | + | image_width_original, image_height_original = image_surface.get_width(), image_surface.get_height() |
| − | + | image_scale_x, image_scale_y = pdf_width/image_width_original, pdf_height/image_height_original | |
| − | image_scale_x = pdf_width / image_width_original | + | print ' ... image original: ', image_width_original, image_height_original, image_scale_x, image_scale_y |
| − | |||
| − | print ' | ||
| + | print '- erstelle Bild Context und zeige Bild darauf' | ||
context = cairo.Context(cairo_surface) | context = cairo.Context(cairo_surface) | ||
context.rectangle(image_x, image_y, image_width_original, image_height_original) | context.rectangle(image_x, image_y, image_width_original, image_height_original) | ||
context.scale(image_scale_y,image_scale_y) | context.scale(image_scale_y,image_scale_y) | ||
pattern_pattern = cairo.SurfacePattern(image_surface) | pattern_pattern = cairo.SurfacePattern(image_surface) | ||
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context.set_source(pattern_pattern) | context.set_source(pattern_pattern) | ||
context.fill() | context.fill() | ||
| + | print ' ... ', context | ||
| + | print '- for' | ||
| + | for i in range(pdf_pages): | ||
| + | print' - erstelle Seite', i+2 | ||
| + | cairo_surface.copy_page() | ||
| + | #cairo_surface.show_page() | ||
| − | + | context = cairo.Context(cairo_surface) | |
| − | + | context.rectangle(image_x, image_y, image_width_original, image_height_original) | |
| − | + | context.scale(image_scale_y,image_scale_y) | |
| − | + | pattern_pattern = cairo.SurfacePattern(image_surface) | |
| + | context.set_source(pattern_pattern) | ||
| + | context.fill() | ||
</source> | </source> | ||
Aktuelle Version vom 26. November 2013, 17:22 Uhr
Beispiele
Cairo - erstelle ein pdf in python
folgender Code
- erstellt eine pdf Datei pdf_output,
- liest ein Bild imagename ein
- positioniert dieses auf der ersten Seite
- nimmt das eingelesene Bild und positioniert es als Referenz auf pdf_pages Seiten
#!/usr/bin/env python
try:
import cairocffi as cairo
except ImportError:
import cairo # pycairo
pdf_output = 'test.pdf'
pdf_pages =430
pdf_width = 596.590909091
pdf_height = 843.75
imagename = '/home/dev/CairoSVG/img_65.jpg'
image_x = 0
image_y = 0
print '- erstelle pdf', pdf_output, 'w:', pdf_width, 'h:', pdf_height
cairo_surface = cairo.PDFSurface(pdf_output, pdf_width, pdf_height)
print ' ... ', cairo_surface
print '- lese Bild von Datei ', imagename
input_ = open(imagename, 'rb')
image_bytes = input_.read()
from io import BytesIO
png_file = BytesIO()
from PIL import Image
Image.open(BytesIO(image_bytes)).save(png_file, 'PNG')
png_file.seek(0)
print ' ... ', png_file
print '- lade Bild in Cairobiliothek'
image_surface = cairo.ImageSurface.create_from_png(png_file)
image_width_original, image_height_original = image_surface.get_width(), image_surface.get_height()
image_scale_x, image_scale_y = pdf_width/image_width_original, pdf_height/image_height_original
print ' ... image original: ', image_width_original, image_height_original, image_scale_x, image_scale_y
print '- erstelle Bild Context und zeige Bild darauf'
context = cairo.Context(cairo_surface)
context.rectangle(image_x, image_y, image_width_original, image_height_original)
context.scale(image_scale_y,image_scale_y)
pattern_pattern = cairo.SurfacePattern(image_surface)
context.set_source(pattern_pattern)
context.fill()
print ' ... ', context
print '- for'
for i in range(pdf_pages):
print' - erstelle Seite', i+2
cairo_surface.copy_page()
#cairo_surface.show_page()
context = cairo.Context(cairo_surface)
context.rectangle(image_x, image_y, image_width_original, image_height_original)
context.scale(image_scale_y,image_scale_y)
pattern_pattern = cairo.SurfacePattern(image_surface)
context.set_source(pattern_pattern)
context.fill()
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