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ext_gstater_demo.rb
# # << Haru Free PDF Library 2.0.6 >> -- ext_gstate_demo.rb # # http://libharu.org/ # # Copyright (c) 1999-2006 Takeshi Kanno # # Permission to use, copy, modify, distribute and sell this software # and its documentation for any purpose is hereby granted without fee, # provided that the above copyright notice appear in all copies and # that both that copyright notice and this permission notice appear # in supporting documentation. # It is provided "as is" without express or implied warranty. # require "hpdf" def draw_circles(page, description, x, y) page.set_line_width(1) page.set_rgb_stroke(0, 0, 0) page.set_rgb_fill(1, 0, 0) page.circle(x + 40, y + 40, 40) page.close_path_fill_stroke() page.set_rgb_fill(0, 1, 0) page.circle(x + 100, y + 40, 40) page.close_path_fill_stroke() page.set_rgb_fill(0, 0, 1) page.circle(x + 70, y + 74.64, 40) page.close_path_fill_stroke() page.set_rgb_fill(0, 0, 0) page.begin_text() page.text_out(x + 0.0, y + 130.0, description) page.end_text() end pdf = HPDFDoc.new PAGE_WIDTH = 600 PAGE_HEIGHT = 900 # add a new page object. # page = pdf.add_page page.set_height(PAGE_HEIGHT) page.set_width(PAGE_WIDTH) font = pdf.get_font("Helvetica-Bold", nil) page.set_font_and_size(font, 10) # normal page.gsave() draw_circles(page, "normal", 40, PAGE_HEIGHT - 170) page.grestore() # transparency (0.8) page.gsave() gstate = pdf.create_ext_gstate() gstate.set_alpha_fill(0.8) gstate.set_alpha_stroke(0.8) page.set_ext_gstate(gstate) draw_circles(page, "alpha fill = 0.8", 230, PAGE_HEIGHT - 170) page.grestore() # transparency (0.4) page.gsave() gstate = pdf.create_ext_gstate() gstate.set_alpha_fill(0.4) gstate.set_alpha_stroke(0.4) page.set_ext_gstate(gstate) draw_circles(page, "alpha fill = 0.4", 420, PAGE_HEIGHT - 170) page.grestore() # blend-mode=HPDF_BM_MULTIPLY page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_MULTIPLY) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_MULTIPLY", 40, PAGE_HEIGHT - 340) page.grestore() # blend-mode=HPDF_BM_SCREEN page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_SCREEN) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_SCREEN", 230, PAGE_HEIGHT - 340) page.grestore() # blend-mode=HPDF_BM_OVERLAY page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_OVERLAY) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_OVERLAY", 420, PAGE_HEIGHT - 340) page.grestore() # blend-mode=HPDF_BM_DARKEN page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_DARKEN) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_DARKEN", 40, PAGE_HEIGHT - 510) page.grestore() # blend-mode=HPDF_BM_LIGHTEN page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_LIGHTEN) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_LIGHTEN", 230, PAGE_HEIGHT - 510) page.grestore() # blend-mode=HPDF_BM_COLOR_DODGE page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_COLOR_DODGE) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_COLOR_DODGE", 420, PAGE_HEIGHT - 510) page.grestore() # blend-mode=HPDF_BM_COLOR_BUM page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_COLOR_BUM) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_COLOR_BUM", 40, PAGE_HEIGHT - 680) page.grestore() # blend-mode=HPDF_BM_HARD_LIGHT page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_HARD_LIGHT) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_HARD_LIGHT", 230, PAGE_HEIGHT - 680) page.grestore() # blend-mode=HPDF_BM_SOFT_LIGHT page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_SOFT_LIGHT) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_SOFT_LIGHT", 420, PAGE_HEIGHT - 680) page.grestore() # blend-mode=HPDF_BM_DIFFERENCE page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_DIFFERENCE) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_DIFFERENCE", 40, PAGE_HEIGHT - 850) page.grestore() # blend-mode=HPDF_BM_EXCLUSHON page.gsave() gstate = pdf.create_ext_gstate() gstate.set_blend_mode(HPDFDoc::HPDF_BM_EXCLUSHON) page.set_ext_gstate(gstate) draw_circles(page, "HPDF_BM_EXCLUSHON", 230, PAGE_HEIGHT - 850) page.grestore() pdf.save_to_file($0 + ".pdf")
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