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# coding: UTF-8
# frozen_string_literal: true
#============================================================+
# Begin : 2008-12-23
# Last Update : 2023-02-23
#
# Description : Example 042 for RBPDF class
# Test Image with alpha channel (need rmagick)
#
# Author: Jun NAITOH
# License: LGPL 2.1 or later
#============================================================+
require("example_common.rb")
class Example042Controller < ApplicationController
def index
# create new PDF document
pdf = RBPDF.new(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false)
# set document information
pdf.set_creator(PDF_CREATOR)
pdf.set_author(PDF_AUTHOR)
pdf.set_title('RBPDF Example 042')
pdf.set_subject('RBPDF Tutorial')
pdf.set_keywords('RBPDF, PDF, example, test, guide')
# set default header data
pdf.set_header_data(PDF_HEADER_LOGO, PDF_HEADER_LOGO_WIDTH, PDF_HEADER_TITLE + ' 042', PDF_HEADER_STRING)
# set header and footer fonts
pdf.set_header_font([PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN])
pdf.set_footer_font([PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA])
# set default monospaced font
pdf.set_default_monospaced_font(PDF_FONT_MONOSPACED)
# set margins
pdf.set_margins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT)
pdf.set_header_margin(PDF_MARGIN_HEADER)
pdf.set_footer_margin(PDF_MARGIN_FOOTER)
# set auto page breaks
pdf.set_auto_page_break(true, PDF_MARGIN_BOTTOM)
# set image scale factor
pdf.set_image_scale(PDF_IMAGE_SCALE_RATIO)
# set some language-dependent strings
pdf.set_language_array($l)
# ---------------------------------------------------------
# set JPEG quality
#pdf.set_jpeg_quality(75)
pdf.set_font('helvetica', '', 18)
# add a page
pdf.add_page()
# create background text
background_text = 'RBPDF test PNG Alpha Channel ' * 50
pdf.multi_cell(0, 5, background_text, 0, 'J', 0, 2, '', '', true, 0, false)
# need rmagick
begin
# --- Method (A) ------------------------------------------
# the image() method recognizes the alpha channel embedded on the image:
pdf.image(PDF_PNG_TEST_ALPHA_PNG, 50, 50, 100, '', '', 'https://github.com/naitoh/rbpdf', '', false, 300)
pdf.image(PDF_WEBP_TEST_ALPHA_PNG, 50, 80, 100, '', '', 'https://github.com/naitoh/rbpdf', '', false, 300)
pdf.image(PDF_GIF_TEST_ALPHA_GIF, 50, 110, 100, '', '', 'https://github.com/naitoh/rbpdf', '', false, 300)
# --- Method (B) ------------------------------------------
# provide image + separate 8-bit mask
# first embed mask image (w, h, x and y will be ignored, the image will be scaled to the target image's size)
mask = pdf.image(PDF_PNG_TEST_MSK_ALPHA_PNG, 50, 140, 100, '', '', '', '', false, 300, '', true)
# embed image, masked with previously embedded mask
pdf.image(PDF_PNG_TEST_NON_ALPHA_PNG, 50, 140, 100, '', '', 'https://github.com/naitoh/rbpdf', '', false, 300, '', false, mask)
# first embed mask image (w, h, x and y will be ignored, the image will be scaled to the target image's size)
mask = pdf.image(PDF_GIF_TEST_MSK_ALPHA_PNG, 50, 170, 100, '', '', '', '', false, 300, '', true)
# embed image, masked with previously embedded mask
pdf.image(PDF_GIF_TEST_NON_ALPHA_PNG, 50, 170, 100, '', '', 'https://github.com/naitoh/rbpdf', '', false, 300, '', false, mask)
rescue => err
logger.error "pdf: Image: error: #{err.message}"
end
# ---------------------------------------------------------
# Close and output PDF document
send_data pdf.output(), :type => "application/pdf", :disposition => "inline"
end
end
#============================================================+
# END OF FILE
#============================================================+
|
