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Initial take on Spec 800 braille

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Spacing seems off; probably mis-interpreting 3.2.3.2 and 3.2.4.
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Andrew Plumb 2012-02-19 23:29:13 -05:00
parent 70a31597c4
commit 7ec98787a7
1 changed files with 48 additions and 6 deletions
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54
fonts.scad
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@ -514,13 +514,55 @@ function 8bit_polyfont(dx=0.1,dy=0.1) = [
,[127,"^?","", "DEL","Delete",[[0,0],[8,8]],[]]
] ];
// From http://www.brailleauthority.org/sizespacingofbraille/
//
// Section 3.2 of Specification 800 (Braille Books and Pamphlets) February 2008 reads as follows:
// Size and Spacing
// 3.2.1 The nominal height of braille dots shall be 0.019 inches [0.48 mm] and shall be uniform within any given transcription.
// 3.2.2 The nominal base diameter of braille dots shall be 0.057 inches [1.44 mm].
// 3.2.3 Cell spacing of dots shall conform to the following:
// 3.2.3.1 The nominal distance from center to center of adjacent dots (horizontally or vertically, but not diagonally)
// in the same cell shall be 0.092 inches [2.340 mm].
// 3.2.3.2 The nominal distance from center to center of corresponding dots in adjacent cells shall be 0.245 inches [6.2 mm].
// 3.2.4 The nominal line spacing of braille cells from center to center of nearest corresponding dots in adjacent lines shall
// be 0.400 inches [1.000 cm].
//
// Additional References:
// http://www.loc.gov/nls/specs/800.pdf
module braille_ascii_spec800(inString,dot_backing=true,cell_backing=false,justify=1,align=-1,dot_h=0.48,dot_d=1.44,dot_spacing=2.340,cell_d2d_spacing=6.2, line_d2d_spacing=10.0, echo_translate=true) {
// justify:
// -1 : left side
// 0 : center
// 1 : right side (default)
// align:
// -1 : bottom braille cell edge - shift up (default)
// 0 : center braille cell
// 1 : top braille cell edge - shift down
thisFont=braille_ascii_font(dot_h=dot_h,dot_d=dot_d,dot_spacing=dot_spacing
,cell_d2d_spacing=cell_d2d_spacing,line_d2d_spacing=line_d2d_spacing);
x_shift=thisFont[0][0];
y_shift=thisFont[0][1];
theseIndicies=search(inString,thisFont[2],1,1);
for( i=[0:len(theseIndicies)-1]) translate([i*x_shift,-y_shift*(align+1)/2]) assign(dotPattern=thisFont[2][theseIndicies[i]][6]) {
if(dot_backing) translate([cell_d2d_spacing/2-dot_d/2,line_d2d_spacing/2-dot_d/2,-dot_h])
cube(size=[x_shift-cell_d2d_spacing+dot_d,y_shift-line_d2d_spacing+dot_d,dot_h],center=false);
if(cell_backing) translate([0,0,-dot_h])
cube(size=[x_shift,y_shift,dot_h],center=false);
if(echo_translate) echo(str(inString[i]," maps to '",thisFont[2][theseIndicies[i]][4],"'"));
for(dotIndex=dotPattern) {
translate([cell_d2d_spacing/2+floor((dotIndex-1)/3)*dot_spacing, line_d2d_spacing/2+(2-(dotIndex-1)%3)*dot_spacing])
scale([dot_d,dot_d,2*dot_h]) sphere($fn=8,r=0.5);
}
}
}
// Encoding from http://en.wikipedia.org/wiki/Braille_ASCII
// Dot Pattern:
// 1 2
// 3 4
// 5 6
function braille_ascii_font(dx=0.1,dy=0.1) = [
[2,3,0,"fixed"],["Decimal Byte","Caret Notation","Character Escape Code","Abbreviation","Name","Bound Box","[points,paths]"]
// 1 4
// 2 5
// 3 6
function braille_ascii_font(dot_h=0.48,dot_d=1.44,dot_spacing=2.340,cell_d2d_spacing=6.2,line_d2d_spacing=10.0) = [
[2*dot_spacing+cell_d2d_spacing,3*dot_spacing+line_d2d_spacing,0,"bump"],["Decimal Byte","Caret Notation","Character Escape Code","Abbreviation","Name","Bound Box","[bump_list]"]
,[
[ 0,"^@","\0","NUL","Null character",[[0,0],[2,3]],[]]
,[ 1,"^A","", "SOH","Start of Header",[[0,0],[2,3]],[]]
@ -554,7 +596,7 @@ function braille_ascii_font(dx=0.1,dy=0.1) = [
,[ 29,"^]","", "GS", "Group Separator",[[0,0],[2,3]],[]]
,[ 30,"^^","", "RS", "Record Separator",[[0,0],[2,3]],[]]
,[ 31,"^_","", "US", "Unit Separator",[[0,0],[2,3]],[]]
,[ 32," "," ", "", "Space",[[0,0],[2,8]],[]]
,[ 32," "," ", "", "Space",[[0,0],[2,3]],[]]
,[ 33,"!","!", "", "the",[[0,0],[2,3]],[ 2,3,4,6 ]]
,[ 34,"\"","\"","", "(contraction)",[[0,0],[2,3]],[ 5 ]]
,[ 35,"#","#", "", "(number prefix)",[[0,0],[2,3]],[ 3,4,5,6 ]]