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Accepting a lang option and applying it to canvas's ctx.lang #58

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Merged
merged 3 commits into from
Aug 5, 2025
Merged

Accepting a lang option and applying it to canvas's ctx.lang #58

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c609b35
include lang option in constructor and pass to ctx
mapmeld Aug 2, 2025
6be3177
concept for test
mapmeld Aug 2, 2025
cac50c6
remove extra setting
mapmeld Aug 5, 2025
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1 change: 1 addition & 0 deletions index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ export declare type TinySDFOptions = {
fontFamily?: string;
fontWeight?: string;
fontStyle?: string;
lang?: string;
};

export default class TinySDF {
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5 changes: 4 additions & 1 deletion index.js
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Expand Up @@ -8,11 +8,13 @@ export default class TinySDF {
cutoff = 0.25,
fontFamily = 'sans-serif',
fontWeight = 'normal',
fontStyle = 'normal'
fontStyle = 'normal',
lang = null
} = {}) {
this.buffer = buffer;
this.cutoff = cutoff;
this.radius = radius;
this.lang = lang;

// make the canvas size big enough to both have the specified buffer around the glyph
// for "halo", and account for some glyphs possibly being larger than their font size
Expand Down Expand Up @@ -67,6 +69,7 @@ export default class TinySDF {
if (glyphWidth === 0 || glyphHeight === 0) return glyph;

const {ctx, buffer, gridInner, gridOuter} = this;
if (this.lang) ctx.lang = this.lang;
ctx.clearRect(buffer, buffer, glyphWidth, glyphHeight);
ctx.fillText(char, buffer, buffer + glyphTop);
const imgData = ctx.getImageData(buffer, buffer, glyphWidth, glyphHeight);
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10 changes: 10 additions & 0 deletions test/test.js
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Expand Up @@ -105,3 +105,13 @@ test('does not return negative-width glylphs', () => {
assert.equal(glyph.glyphWidth, 0);
assert.equal(glyph.width, 6); // zero-width glyph with 3px buffer
});

/*
test('renders Chinese and Japanese versions of characters', () => {
const sdf1 = new MockTinySDF({lang: 'zh'});
const glyph1 = sdf1.draw('门');
const sdf2 = new MockTinySDF({lang: 'ja'});
const glyph2 = sdf2.draw('门');
assert.notDeepStrictEqual(glyph1.data, glyph2.data);
});
*/