167 lines
No EOL
6 KiB
Text
167 lines
No EOL
6 KiB
Text
define bezierCubic2Q2 [require 'node-sfnt/lib/math/bezierCubic2Q2']
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define tp [require './transform'].transformPoint
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define utp [require './transform'].untransform
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define Stroke [require './stroke'].Stroke
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define id (
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.xx 1
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.yx 0
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.xy 0
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.yy 1
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.x 0
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.y 0
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)
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define [fallback] : for [local j 0] [j < arguments.length] [inc j] : if [arguments`j !== nothing] : return arguments`j
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define aFunction (.unapply [function [obj arity] [if [obj <@ Function] (obj) null]])
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define [Glyph name] : begin {
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set this.name name
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set this.unicode ()
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set this.contours ()
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set this.advanceWidth 500
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set this.anchors (.)
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set this.gizmo (
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.xx 1
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.yx 0
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.xy 0
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.yy 1
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.x 0
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.y 0
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)
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set this.dependencies ()
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return nothing
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}
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define Glyph.is (.unapply [function [obj arity] [if [obj <@ Glyph] (obj) null]])
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define [Glyph.prototype.set-width w] : begin {
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this.advanceWidth = w
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return this
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}
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define [Glyph.prototype.assign-unicode u] : begin {
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this.unicode.push : piecewise {
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[[typeof u] === 'string'] : u.charCodeAt 0
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true u
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}
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return this
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}
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define [Glyph.prototype.start-from x y] : begin {
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this.contours.push ([tp this.gizmo (.x x .y y .onCurve true)])
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return this
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}
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define [Glyph.prototype.line-to x y] : begin {
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this.contours`[this.contours.length - 1].push [tp this.gizmo (.x x .y y .onCurve true)]
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return this
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}
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define [Glyph.prototype.curve-control x y] : begin {
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this.contours`[this.contours.length - 1].push [tp this.gizmo (.x x .y y .onCurve false)]
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return this
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}
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define [Glyph.prototype.curve-to xc yc x y] : begin {
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this.contours`[this.contours.length - 1].push [tp this.gizmo (.x xc .y yc .onCurve false)] [tp this.gizmo (.x x .y y .onCurve true)]
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return this
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}
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define [Glyph.prototype.arc-vh-to x y kappa] : begin {
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local lastContour this.contours`[this.contours.length - 1]
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local lastPoint lastContour`[lastContour.length - 1]
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local last : utp this.gizmo lastPoint
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this.cubic-to last.x [last.y + [fallback kappa 0.618] * [y - last.y]] [x + [fallback kappa 0.618] * [last.x - x]] y x y
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return this
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}
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define [Glyph.prototype.arc-hv-to x y kappa] : begin {
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local lastContour this.contours`[this.contours.length - 1]
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local lastPoint lastContour`[lastContour.length - 1]
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local last : utp this.gizmo lastPoint
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this.cubic-to [last.x + [fallback kappa 0.618] * [x - last.x]] last.y x [y + [fallback kappa 0.618] * [last.y - y]] x y
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return this
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}
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define [Glyph.prototype.cubic-to x1 y1 x2 y2 x y] : begin {
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local lastContour this.contours`[this.contours.length - 1]
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local lastPoint lastContour`[lastContour.length - 1]
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local last : utp this.gizmo lastPoint
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local segments [bezierCubic2Q2 last (.x x1 .y y1) (.x x2 .y y2) (.x x .y y)]
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foreach (p0 (.x xc .y yc) (.x xf .y yf)) [items-of segments] : this.curve-to xc yc xf yf
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return this
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}
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define [Glyph.prototype.reverse-last] : begin {
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this.contours.[this.contours.length - 1] = [this.contours.[this.contours.length - 1].reverse]
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}
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define [Glyph.prototype.put-shapes contours] : begin {
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# do not double-transform
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local t this.gizmo
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set this.gizmo id
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foreach contour [items-of contours] : begin {
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this.start-from contour.0.x contour.0.y
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for [local j 1] [j < contour.length] [inc j] : begin {
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local point contour`j
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if point.cubic [begin {
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local p2 contour`[j + 1]
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local p3 contour`[j + 2]
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this.cubic-to point.x point.y p2.x p2.y p3.x p3.y
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j = j + 2
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}] [if point.onCurve [this.line-to point.x point.y] [this.curve-control point.x point.y]]
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}
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}
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set this.gizmo t
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return this
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}
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define [Glyph.prototype.include component copyAnchors] : begin {
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local glyph : match component {
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[aFunction it] : return : component.call this
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[Stroke.is it] (.contours [component.to-outline 0 0])
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(:: contours) (.contours contours)
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otherwise component
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}
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local contours glyph.contours
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local transform (.x 0 .y 0 .xx 1 .yy 1 .xy 0 .yx 0)
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local shiftx 0
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local shifty 0
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if [this.anchors && glyph.anchors] : foreach markid [items-of [Object.keys this.anchors]] : begin {
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local anchorThis this.anchors`markid
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local anchorThat glyph.anchors`markid
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if [anchorThis && [anchorThis.type === 'base' || anchorThis.mbx !== nothing && anchorThis.mby !== nothing] && anchorThat && anchorThat.type === 'mark'] : begin {
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set (shiftx shifty) (
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[[fallback anchorThis.mbx anchorThis.x] - anchorThat.x]
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[[fallback anchorThis.mby anchorThis.y] - anchorThat.y]
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)
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if [anchorThat.mbx !== nothing && anchorThat.mby !== nothing] : begin {
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set this.anchors`markid (
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.x [anchorThis.x + anchorThat.mbx - anchorThat.x]
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.y [anchorThis.y + anchorThat.mby - anchorThat.y]
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.type anchorThis.type
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.mbx anchorThis.mbx
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.mby anchorThis.mby
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)
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}
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}
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}
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set transform.x : transform.x + shiftx
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set transform.y : transform.y + shifty
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if contours : begin {
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this.put-shapes : contours.map : function [contour] {
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contour.map : function [point] : tp transform point
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}
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}
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if [[[not contours] || copyAnchors] && glyph.anchors] : set this.anchors : let [a (.)] [anchors glyph.anchors] [keys : Object.keys glyph.anchors] : begin {
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foreach k [items-of keys] [set a`k anchors`k]
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* a
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}
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piecewise {
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glyph.name : this.dependencies.push glyph.name
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glyph.dependencies : this.dependencies = [this.dependencies.concat glyph.dependencies]
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}
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}
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define [Glyph.prototype.apply-transform transform] : set this.contours : this.contours.map : function [contour] : begin {
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return : contour.map : function [point] [tp transform point]
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}
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define [Glyph.prototype.create-stroke] : begin {
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local s : new Stroke
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s.gizmo = [Object.create this.gizmo]
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return s
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}
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define [Glyph.prototype.set-anchor id type x y mbx mby] : begin {
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local anchorpoint [tp this.gizmo (.x x .y y)]
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local markbasepoint : if [mbx !== nothing && mby !== nothing] [tp this.gizmo (.x mbx .y mby)] (.x nothing .y nothing)
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this.anchors`id = (.x anchorpoint.x .y anchorpoint.y .type type .mbx markbasepoint.x .mby markbasepoint.y)
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}
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exports.Glyph = Glyph |