JezK
Edit File: brcd-drv-svg.lua
-- -- ga Intermediate Graphic Language for barcode drawing -- SVG driver for the ga graphic stream -- Copyright (C) 2019-2022 Roberto Giacomelli -- -- All dimension in the ga stream are scaled point (sp) -- 1 pt = 65536 sp -- class for drawing elementary geometric elements local SVG = {_drvname = "SVG"} SVG.ext = "svg" -- file extension SVG.buf_sep = nil -- separation string for buffer concat function SVG.init_buffer(st) --> buffer, text buffer local bf = { '<?xml version="1.0" encoding="UTF-8" standalone="no"?>\n', '<!-- Created with Barracuda package (https://github.com/robitex/barracuda) -->\n', '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"\n', ' "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n', '<svg xmlns="http://www.w3.org/2000/svg"\n', ' version="1.1"\n', ' width="%0.6fmm" height="%0.6fmm"\n', -- line 7 ' viewBox="%0.6f %0.6f %0.6f %0.6f"\n', -- line 8 '>\n', } -- additions for SVG driver to 'state' st.ident_lvl = 1 -- identation level st.char_buf = nil -- character buffer local mm = st.mm st.h_char = 2.1 * mm -- char height (mm) st.w_char = st.h_char / 1.303 -- average char width (mm) st.d_char = st.h_char / 3.7 -- char deep (mm) return bf, {} end function SVG.close_buffer(st, bf, xt) bf[#bf + 1] = '</svg>\n' -- close svg xml element bf[#bf + 1] = '\n' -- a last empty line local mm = st.mm local x1, y1, x2, y2 = st.bb_x1 or 0, st.bb_y1 or 0, st.bb_x2 or 0, st.bb_y2 or 0 local w = (x2 - x1)/mm local h = (y2 - y1)/mm local fmt_wh = bf[7] bf[7] = string.format(fmt_wh, w, h) -- line 7 local x, y = x1/mm, -y2/mm local fmt_vw = bf[8] bf[8] = string.format(fmt_vw, x, y, w, h) end -- SVG encoding functions -- 1 <W: dim>; set line width function SVG.append_001(st, bf, xt, w) -- nothing to do end -- 2 <enum: u8>; set line cap style function SVG.append_002(st, bf, xt, cap) -- nothing to do end -- 3 <enum: u8>; set line join style function SVG.append_003(st, bf, xt, j) -- nothing to do end -- 5 <dash_pattern> function SVG.append_005(st, bf, xt) -- nothing to do end -- 6 <reset_pattern> function SVG.append_006(st, bf, xt) -- nothing to do end -- draw an horizontal line <hline> opcode -- 33 <x1: DIM> <x2: DIM> <y: DIM> function SVG.append_033(st, bf, xt, x1, x2, y) local lvl = st.ident_lvl local ident = string.rep(" ", lvl) -- a couple of spaces as indentation local mm = st.mm -- conversion ratio sp -> bp bf[#bf + 1] = string.format( -- <path> element '%s<path d="M%0.6f %0.6fH %0.6f"\n', ident, x1/mm, -y/mm, x2/mm ) local lw = st.linewidth bf[#bf + 1] = string.format( '%s stroke="black" stroke-width="%0.6f"\n', ident, lw/mm ) local dash = st.dashpattern if dash then local t = {} for _, d in ipairs(dash) do t[#t + 1] = string.format("%0.6f", d/mm) end bf[#bf + 1] = string.format( '%s stroke-dasharray="%s"\n', ident, table.concat(t, " ") ) local phase = st.dashphase assert(phase >= 0) if phase > 0 then bf[#bf + 1] = string.format( '%s stroke-dashoffset="%0.6f"\n', ident, phase/mm ) end end bf[#bf + 1] = ident..'/>\n' end -- Vertical line: 34 <y1: DIM> <y2: DIM> <x: DIM> function SVG.append_034(st, bf, xt, y1, y2, x) local lvl = st.ident_lvl local ident = string.rep(" ", lvl) -- a couple of spaces as indentation local mm = st.mm -- conversion ratio sp -> mm bf[#bf + 1] = string.format( -- <path> element '%s<path d="M%0.6f %0.6f V%0.6f"\n', ident, x/mm, -y2/mm, -y1/mm ) local lw = st.linewidth bf[#bf + 1] = string.format( '%s stroke="black" stroke-width="%0.6f"\n', ident, lw/mm ) local dash = st.dashpattern if dash then local t = {} for _, d in ipairs(dash) do t[#t + 1] = string.format("%0.6f", d/mm) end bf[#bf + 1] = string.format( '%s stroke-dasharray="%s"\n', ident, table.concat(t, " ") ) local phase = st.dashphase assert(phase >= 0) if phase > 0 then bf[#bf + 1] = string.format( '%s stroke-dashoffset="%0.6f"\n', ident, phase/mm ) end end bf[#bf + 1] = ident..'/>\n' end -- Vbar -- draw a group of vertical lines -- 36 <y1: DIM> <y2: DIM> <b: UINT> <x1: DIM> <t1: DIM> ... function SVG.append_036_start(st, bf, xt, nbar, y1, y2) local lvl = st.ident_lvl local ident = string.rep(" ", lvl) bf[#bf + 1] = ident..'<g stroke="black">\n' -- open a group st.ident_lvl = lvl + 1 end function SVG.append_036_bar(st, bf, xt, x, w, y1, y2) local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local mm = st.mm -- conversion factor mm -> sp bf[#bf + 1] = string.format( '%s<path d="M%0.6f %0.6fV%0.6f" style="stroke-width:%0.6f"/>\n', ident, x/mm, -y2/mm, -y1/mm, w/mm ) end function SVG.append_036_stop(st, bf, xt, nbar, y1, y2) st.ident_lvl = st.ident_lvl - 1 local ident = string.rep(" ", st.ident_lvl) bf[#bf + 1] = ident..'</g>\n' -- end group end -- Polyline -- draw a polyline -- 38 <n> <x1: DIM> <y1: DIM> ... <xn: DIM> <yn: DIM> function SVG.append_038_start(st, bf, xt, n, x1, y1) local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local mm = st.mm -- conversion factor mm -> sp local style = string.format( '%s<g stroke="black" stroke-width="%0.6f" fill="none"', ident, st.linewidth/mm ) local dash = st.dashpattern if dash then local t = {} for _, d in ipairs(dash) do t[#t + 1] = string.format("%0.6f", d/mm) end style = string.format( '%s stroke-dasharray="%s"', style, table.concat(t, " ") ) local phase = st.dashphase assert(phase >= 0) if phase > 0 then style = string.format( '%s stroke-dashoffset="%0.6f"', style, phase/mm ) end end bf[#bf + 1] = style..'>\n' ident = ident .. " " bf[#bf + 1] = string.format('%s<polyline points="%0.6f,%0.6f', ident, x1/mm, -y1/mm ) st.ident_lvl = lvl + 1 end function SVG.append_038_point(st, bf, xt, x, y) local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local mm = st.mm -- conversion factor mm -> sp bf[#bf + 1] = string.format('\n%s%0.6f,%0.6f', ident, x/mm, -y/mm) end function SVG.append_038_stop(st, bf, xt) bf[#bf + 1] = '"/>\n' -- closing tag local lvl = st.ident_lvl - 1 local ident = string.rep(" ", lvl) st.ident_lvl = lvl bf[#bf + 1] = ident..'</g>\n' -- close the group end -- draw a rectangle -- 48 <x1: DIM> <y1: DIM> <x2: DIM> <y2: DIM> function SVG.append_048(st, bf, xt, x1, y1, x2, y2) local w = x2 - x1 -- rectangle width assert(w > 0) local h = y2 - y1 -- rectangle height assert(h > 0) local mm = st.mm -- conversion factor mm -> sp local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local fmt = '%s<rect x="%0.6f" y="%0.6f" width="%0.6f" height="%0.6f"' bf[#bf + 1] = string.format(fmt, ident, x1/mm, -y2/mm, w/mm, h/mm) local lw = st.linewidth bf[#bf + 1] = string.format( '%s fill="none" stroke="black" stroke-width="%0.6f"\n', ident, lw/mm ) local dash = st.dashpattern if dash then local t = {} for _, d in ipairs(dash) do t[#t + 1] = string.format("%0.6f", d/mm) end bf[#bf + 1] = string.format( '%s stroke-dasharray="%s"\n', ident, table.concat(t, " ") ) local phase = st.dashphase assert(phase >= 0) if phase > 0 then bf[#bf + 1] = string.format( '%s stroke-dashoffset="%0.6f"\n', ident, phase/mm ) end end bf[#bf + 1] = ident..'/>\n' end -- Text -- 130 <text> Text with several glyphs -- 130 <ax: FLOAT> <ay: FLOAT> <xpos: DIM> <ypos: DIM> <c: CHARS> function SVG.append_130_char(st, bf, xt, c) local ch = string.char(c) if not st.char_buf then st.char_buf = {ch} else local chars = st.char_buf chars[#chars + 1] = ch end end function SVG.append_130_stop(st, bf, xt, xpos, ypos, ax, ay) --> p1, p2 local c = st.char_buf st.char_buf = nil local txt = table.concat(c) local w = st.w_char * #c -- approx dim local h = st.h_char local d = st.d_char local anchor = "" local x1 = xpos local bx1 = xpos if ax == 0 then -- start (default) elseif ax == 0.5 then -- middle anchor = ' text-anchor="middle"' bx1 = bx1 - w/2 elseif ax == 1 then -- end anchor = ' text-anchor="end"' bx1 = bx1 - w else x1 = x1 - ax*w bx1 = x1 end local y1 = ypos if ay > 0 then y1 = y1 - h*ay else y1 = y1 - d*ay end local fs = st.h_char * 1.37 -- sp local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local mm = st.mm bf[#bf + 1] = string.format( '%s<text x="%0.6f" y="%0.6f" font-family="Verdana" font-size="%0.6f"%s>\n', ident, x1/mm, -y1/mm, fs/mm, anchor ) bf[#bf + 1] = ident..txt bf[#bf + 1] = ident..'</text>\n' return bx1, y1, bx1 + w, y1 + h end -- 131 <text_xspaced>, Text with glyphs equally spaced on its vertical axis -- 131 <x1: DIM> <xgap: DIM> <ay: FLOAT> <ypos: DIM> <c: CHARS> function SVG.append_131_char(st, bf, xt, c, xgap) local ch = string.char(c) if not st.char_buf then st.char_buf = {ch} else local chars = st.char_buf chars[#chars + 1] = ch end end function SVG.append_131_stop(st, bf, xt, x1, xgap, ypos, ay) --> p1, p2 local chars = st.char_buf st.char_buf = nil local n = #chars local h = st.h_char -- height local d = st.d_char -- deep local hw = st.w_char/2 -- sp half width local y1 = ypos if ay > 0 then y1 = y1 - h*ay else y1 = y1 - d*ay end local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local fs = st.h_char * 1.37 -- (sp) font-size -> inter baselines distance local mm = st.mm bf[#bf + 1] = string.format( '%s<text y="%0.6f" font-family="Verdana" font-size="%0.6f" text-anchor="middle">\n', ident, -y1/mm, fs/mm ) local x = x1 for _, c in ipairs(chars) do bf[#bf + 1] = string.format('%s<tspan x="%0.6f">%s</tspan>\n', ident, x/mm, c ) x = x + xgap end bf[#bf + 1] = ident..'</text>\n' local x2 = x1 + (n - 1)*xgap -- sp return x1 - hw, y1, x2 + hw, y1 + h -- text group bounding box end -- 132 <text_xwidth> Glyphs equally spaced on vertical axis between two x coordinates -- 132 <ay: FLOAT> <x1: DIM> <x2: DIM> <y: DIM> <c: CHARS> function SVG.append_132_char(st, bf, xt, c, xgap) local ch = string.char(c) if not st.char_buf then st.char_buf = {ch} else local chars = st.char_buf chars[#chars + 1] = ch end end function SVG.append_132_stop(st, bf, xt, x1, x2, ypos, ay) --> p1, p2 local chars = st.char_buf; st.char_buf = nil local n = #chars local h = st.h_char -- height (approx) local d = st.d_char -- deep (approx) local cw = st.w_char -- (sp) char width (approx) local xgap = (x2 - x1 - cw)/(n - 1) local y1 = ypos if ay > 0 then y1 = y1 - h*ay else y1 = y1 - d*ay end local lvl = st.ident_lvl local ident = string.rep(" ", lvl) local fs = st.h_char * 1.37 -- font-size -> inter baselines distance local mm = st.mm bf[#bf + 1] = string.format( '%s<text y="%0.6f" font-family="Verdana" font-size="%0.6f" text-anchor="middle">\n', ident, -y1/mm, fs/mm ) local x = x1 + cw/2 for _, c in ipairs(chars) do bf[#bf + 1] = string.format('%s<tspan x="%0.6f">%s</tspan>\n', ident, x/mm, c ) x = x + xgap end bf[#bf + 1] = ident..'</text>\n' return x1, y1, x2, y1 + h -- text group bounding box end return SVG