Awesome

lua-resty-hpdf

LuaJIT FFI-based libHaru (PDF) library for OpenResty.

usage

local hpdf = require "hpdf"

local left = 25;
local top = 545;
local right = 200;
local bottom = top - 40;
local text = "The quick brown fox jumps over the lazy dog."

local pdf = hpdf.new()
pdf.encoder:use('utf')
pdf.font:labels(0, "LOWER_ROMAN", 1, "")

local fontname = pdf.font:load("/usr/local/openresty/nginx/lua/DejaVuSans.ttf", true)
local font = pdf.font:get(fontname, "UTF-8")
local page = pdf.pages:add()
page:set_size("A5", "PORTRAIT")
page:text_leading(20)

grid(pdf, page)

-- LEFT
page:rectangle(left, bottom, right - left, top - bottom)
page:stroke()
page:set_font_and_size(font, 8)
page:begin_text()
page:text_out(left, top + 3, "demo align LEFT")
page:set_font_and_size(font, 10)
page:text_rect(left, top, right, bottom, text, "LEFT", nil)
page:end_text()

-- RIGTH
left = 220;
right = 395;

page:rectangle(left, bottom, right - left, top - bottom)
page:stroke()
page:set_font_and_size(font, 8)
page:begin_text()
page:text_out(left, top + 3, "demo align LEFT")
page:set_font_and_size(font, 10)
page:text_rect(left, top, right, bottom, text, "RIGHT", nil)
page:end_text()

-- CENTER 
left = 25;
top = 475;
right = 200;
bottom = top - 40;

page:rectangle(left, bottom, right - left, top - bottom)
page:stroke()
page:set_font_and_size(font, 8)
page:begin_text()
page:text_out(left, top + 3, "demo align CENTER")
page:set_font_and_size(font, 10)
page:text_rect(left, top, right, bottom, text, "CENTER", nil)
page:end_text()

-- JUSTIFY
left = 220
right = 395

page:rectangle(left, bottom, right - left, top - bottom)
page:stroke()
page:set_font_and_size(font, 8)
page:begin_text()
page:text_out(left, top + 3, "demo align JUSTIFY")
page:set_font_and_size(font, 10)
page:text_rect(left, top, right, bottom, text, "JUSTIFY", nil)
page:end_text()

-- Skewed coordinate system
local angle1 = 5
local angle2 = 10
local rad1 = angle1 / 180 * 3.141592
local rad2 = angle2 / 180 * 3.141592

left = 0
top = 40
right = 175
bottom = 0

page:gsave()
page:concat(1, math.tan(rad1), math.tan(rad2), 1, 25, 350)
page:rectangle(left, bottom, right - left, top - bottom)
page:stroke()
page:set_font_and_size(font, 8)
page:begin_text()
page:text_out(left, top + 3, "Skewed coordinate system")
page:set_font_and_size(font, 10)
page:text_rect(left, top, right, bottom, text, "LEFT", nil)
page:end_text()
page:grestore()


-- Rotated coordinate system
page:gsave()

angle1 = 5
rad1 = angle1 / 180 * 3.141592
left = 0
top = 40
right = 175
bottom = 0

page:concat(math.cos(rad1), math.sin(rad1), -math.sin(rad1), math.cos(rad1), 220, 350)
page:rectangle(left, bottom, right - left, top - bottom)
page:stroke()
page:set_font_and_size(font, 8)
page:begin_text()
page:text_out(left, top + 3, "Rotated coordinate system")
page:set_font_and_size(font, 10)
page:text_rect(left, top, right, bottom, text, "LEFT", nil)
page:end_text()
page:grestore()

-- text along a circle 
angle1 = 360 / string.len(text)
angle2 = 180

page:gray_stroke(0)
page:circle(210, 190, 145)
page:circle(210, 190, 113)
page:stroke()
page:begin_text()
page:set_font_and_size(font, 15)

for i = 0, string.len(text) - 1, 1 do
	rad1 = (angle2 - 90) / 180 * 3.141592
	rad2 = angle2 / 180 * 3.141592
	local x = 210 + math.cos(rad2) * 122
	local y = 190 + math.sin(rad2) * 122
	page:text_matrix(math.cos(rad1), math.sin(rad1), -math.sin(rad1), math.cos(rad1), x, y)
	local chr = text:sub(i,i)
	page:text_show(chr)
	angle2 = angle2 - angle1
end

page:end_text()


pdf:save('document.pdf')
pdf:free()