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valign improvements in path_text

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Adrian Mariano 2023-01-19 18:17:17 -05:00
parent 537a888a28
commit 0568e2ef46
1 changed files with 18 additions and 11 deletions
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shapes3d.scad
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@ -2903,7 +2903,7 @@ function _cut_interp(pathcut, path, data) =
// top = direction or list of directions pointing toward the top of the text
// reverse = reverse the letters if true. Not allowed for 2D path. Default: false
// textmetrics = if set to true and lettersize is not given then use the experimental textmetrics feature. You must be running a dev snapshot that includes this feature and have the feature turned on in your preferences. Default: false
// valign = align text to the path using "top", "bottom", "center" or "baseline". This only works with textmetrics enabled. Default: "baseline"
// valign = align text to the path using "top", "bottom", "center" or "baseline". You can also adjust position with a numerical offset as in "top-5" or "bottom+2". This only works with textmetrics enabled. You can give a simple numerical offset, which will be relative to the baseline and works even without textmetrics. Default: "baseline"
// kern = scalar or array giving spacing adjusments between each letter. If it's an array it should have one less entry than the text string. Default: 0
// Example(3D,NoScales): The examples use Courier, a monospaced font. The width is 1/1.2 times the specified size for this font. This text could wrap around a cylinder.
// path = path3d(arc(100, r=25, angle=[245, 370]));
@ -2967,7 +2967,7 @@ function _cut_interp(pathcut, path, data) =
// kern = [1,1.2,1,1,.3,-.2,1,0,.8,1,1.1,1];
// path_text(path, "Example text", font="Courier", size=5, lettersize = 5/1.2, kern=kern, normal=UP);
module path_text(path, text, font, size, thickness, lettersize, offset=0, reverse=false, normal, top, center=false, textmetrics=false, kern=0, height,h,spacing=1, valign="baseline")
module path_text(path, text, font, size, thickness, lettersize, offset=0, reverse=false, normal, top, center=false, textmetrics=false, kern=0, height,h, valign="baseline")
{
no_children($children);
dummy2=assert(is_path(path,[2,3]),"Must supply a 2d or 3d path")
@ -2998,20 +2998,27 @@ module path_text(path, text, font, size, thickness, lettersize, offset=0, revers
lsize = is_def(lettersize) ? force_list(lettersize, len(text))
: textmetrics ? [for(letter=text) let(t=textmetrics(letter, font=font, size=size)) t.advance[0]]
: assert(false, "textmetrics disabled: Must specify letter size");
lcenter = spacing * convolve(lsize,[1,1]/2)+[0,each kern,0] ;
textlength = spacing*sum(lsize)+sum(kern);
lcenter = convolve(lsize,[1,1]/2)+[0,each kern,0] ;
textlength = sum(lsize)+sum(kern);
ascent = !textmetrics ? undef
: textmetrics(text, font=font, size=size).ascent;
descent = !textmetrics ? undef
: textmetrics(text, font=font, size=size).descent;
vadjustment = !textmetrics ? assert(valign=="baseline","valign requires textmetrics support") 0
: valign=="baseline" ? 0
: valign=="top" ? -ascent
: valign=="bottom" ? descent
: valign=="center" ? (descent-ascent)/2
: assert(false,"Invalid valign value");
vadjustment = is_num(valign) ? -valign
: !textmetrics ? assert(valign=="baseline","valign requires textmetrics support") 0
: let(
table = [
["baseline", 0],
["top", -ascent],
["bottom", descent],
["center", (descent-ascent)/2]
],
match = [for(i=idx(table)) if (starts_with(valign,table[i][0])) i]
)
assert(len(match)==1, "Invalid valign value")
table[match[0]][1] - parse_num(substr(valign,len(table[match[0]][0])));
dummy1 = assert(textlength<=path_length(path),"Path is too short for the text");
@ -3044,7 +3051,7 @@ module path_text(path, text, font, size, thickness, lettersize, offset=0, revers
linear_extrude(height=thickness)
back(vadjustment)
{
//stroke([[0,0],[0,14]], width=.3, endcap2="arrow");
stroke([[0,0],[0,14]], width=.3, endcap2="arrow");
left(lsize[i]/2)
text(text[i], font=font, size=size);