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