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Diffstat (limited to 'muse2/share/scoreglyphs/feta-original/feta-params.mf')
| -rw-r--r-- | muse2/share/scoreglyphs/feta-original/feta-params.mf | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/muse2/share/scoreglyphs/feta-original/feta-params.mf b/muse2/share/scoreglyphs/feta-original/feta-params.mf new file mode 100644 index 00000000..96d98628 --- /dev/null +++ b/muse2/share/scoreglyphs/feta-original/feta-params.mf @@ -0,0 +1,213 @@ +% +% feta-params.mf -- global parameters for both feta and parmesan fonts +% +% source file of the GNU LilyPond music typesetter +% +% (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl> + +stafflines := 5; + +% +% The design size of a staff should really be the +% staff_space, but we use staffsize for historical reasons. +% + +staff_space# := staffsize# / (stafflines - 1); +staff_space_rounded# := staff_space#; + + +% +% Measuring on pocket scores turns out: stafflinethickness is +% largely independent on staff size, and generally about 0.5 pt. +% +% By request of WL, we tune down the blackness a little +% for increased contrast with beams. +% + +%% !! synchronize with paper.scm + +save fixed_line_thickness, variable_line_factor; +fixed_line_thickness + variable_line_factor * 5 pt# = 0.50 pt#; +fixed_line_thickness + variable_line_factor * 4.125 pt# = 0.47 pt#; + +stafflinethickness# := fixed_line_thickness + + variable_line_factor * staff_space#; +stafflinethickness_rounded# := stafflinethickness#; + +% +% The following tunes the general blackness of the glyphs. +% + +linethickness# := stafflinethickness#; %% 0.5 pt#; +linethickness_rounded# := linethickness#; + +% +% bigger puff_up_factor, relatively thicker stafflines. +% +% 20 pt = puff_up_factor 0 +% 10 pt = puff_up_factor 1 +% + +puff_up_factor = (linethickness# - 0.1 staff_space#) / (0.1 staff_space#); + + +stemthickness# := 1.3 stafflinethickness#; +stemthickness_rounded# := stemthickness#; +ledgerlinethickness# := 2 stafflinethickness#; +ledgerlinethickness_rounded# := ledgerlinethickness#; + +define_pixels (staff_space, stemthickness, stafflinethickness, + ledgerlinethickness, linethickness); +define_whole_pixels (staff_space_rounded); +define_whole_blacker_pixels (stemthickness_rounded); +define_whole_vertical_blacker_pixels (stafflinethickness_rounded, + ledgerlinethickness_rounded, + linethickness_rounded); + +if ledgerlinethickness_rounded > 2 stafflinethickness_rounded: + ledgerlinethickness_rounded := 2 stafflinethickness_rounded; +fi; + +% +% Because of the engraving/stamping process, no traditional +% characters have sharp edges and corners. +% The following variable controls the amount of `roundness'. +% +% This is not a meta variable: it is related to absolute sizes. +% +% FIXME: According to [Wanske], only outside corners should be round +% I don't think we do this anywhere -- jcn +% + +blot_diameter# = .40 pt#; +if (blot_diameter# * hppp) < 1: + blot_diameter# := 1 / hppp; +fi +if (blot_diameter# * vppp) < 1: + blot_diameter# := 1 / vppp; +fi + +define_pixels (blot_diameter); + + +% +% symmetry +% -------- +% +% Some glyphs have to be positioned exactly between stafflines (clefs, +% note heads). This needs some care at lower resolutions. +% +% Most glyphs use the staffline thickness and the space between two +% staff lines as the fundamental parameters. The latter is the distance +% between the middle of one staff line to the middle of the next. To +% say it differently, the value `staff_space' is the sum of one staff line +% thickness and the whitespace between two adjacent staff lines. +% +% Normally, feta's vertical origin for glyphs is either the middle +% between two staff lines or the middle of a staff line. For example, the +% lower edge of the central staff line is at the vertical position +% `-<staffline thickness> / 2', and the upper edge at +% `<staffline thickness> / 2'. Here we need a value rounded to an integer +% (the feta code uses `stafflinethickness_rounded' for that purpose). +% +% If we have an odd number of pixels as the staffline thickness, Metafont +% rounds `-stafflinethickness_rounded / 2' towards zero and +% `stafflinethickness_rounded / 2' towards infinity. Example: `round -1.5' +% yields -1, `round 1.5' yields 2. The whitespace between staff lines is +% handled similarly. If we assume that stafflinethickness_rounded is odd, +% we have the following cases: +% +% o The glyph is centered between three stafflines or five stafflines +% (clef, `c' meter). We have this: +% +% ___________ a +% ___________ 1 +% ___________ a +% +% whitespace +% +% ___________ a +% ...... ___________ 1 .................. x axis +% ___________ a +% +% whitespace +% +% ___________ a +% ___________ 1 +% ___________ a +% +% As can be seen, we get symmetry if we split staff lines into two +% equal parts `a' and a pixel line with thickness 1. Consequently, we +% use the following algorithm: +% +% . Decrease the height `h' by 1 temporarily. +% +% . Compute the path for the upper half of the glyph. +% +% . Mirror the path at the x axis. +% +% . Shift the upper half one pixel up and connect it with the lower path. +% +% . Restore height and decrease `d' by 1. +% +% o The glyph is centered between two or four staff lines, and the origin is +% the middle of the whitespace. Assuming that the the whitespace consists +% of an odd number of pixels, we have this: +% +% ----------- +% b +% 1 +% b +% ___________ +% b +% .................. 1 ................. x axis +% b +% ___________ +% b +% 1 +% b +% ___________ +% +% For symmetrical glyphs, this leads to a similar algorithm as above. +% Glyphs which can't be constructed from an upper and lower part need +% to be handled differently, namely to shift up the vertical center by +% half a pixel: +% +% ___________ +% b +% +% 0.5 +% .................. 0.5 ................ x axis +% +% b +% ___________ +% + +feta_eps := 0; +feta_shift := 0; +feta_space_shift := 0; + +% Use this for paths with a slant of 45 degrees to assure that +% the middle point of a penpos gets covered. +pair feta_offset; +feta_offset := (0, 0); + +if known miterlimit: + pickup nullpen; +else: + feta_eps := eps; + + if odd stafflinethickness_rounded: + feta_shift := 1; + fi; + + if odd (staff_space_rounded - stafflinethickness_rounded): + feta_space_shift := 1; + fi; + + feta_offset := (0.5, 0.5); + + pickup pencircle scaled 1; +fi; + +feta_fillpen := savepen; |