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Improve barcode rendering (eliminate semi-transparent strips in solid lines)

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MultiMote
2024-09-11 14:50:33 +03:00
parent 4a8b426548
commit 4ffd42ac30
2 changed files with 32 additions and 7 deletions
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37
niimblue/src/fabric-object/barcode.class.ts
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@@ -75,7 +75,7 @@ export const Barcode = fabric.util.createClass(fabric.Object, {
ctx.fillStyle = this.fill;
const fontHeight = Math.round(Math.max(Math.min(this.height / 10, (this.width / this.text.length) * 1.5), 12));
ctx.font = `bold ${fontHeight}px Courier New`;
ctx.font = `bold ${fontHeight}px Noto Sans Variable`;
ctx.textBaseline = "top";
const fontWidth = ctx.measureText("0").width;
const w2 = this.width / 2,
@@ -94,12 +94,37 @@ export const Barcode = fabric.util.createClass(fabric.Object, {
dh = this.height - fontHeight * 1.2;
dw = (this.width - dp * 2) / this.bandcode.length;
}
let blackStartPosition = -1;
let blackCount = 0;
let long = false;
// render barcode
// todo: snap barcode elements to the pixel grid (to make rendering sharp)
for (let i = 0; i < this.bandcode.length; i++) {
const d = this.bandcode[i];
if (d === "1") {
if (this.encoding === "EAN13" && EAN13_LONG_IDX.includes(i))
ctx.fillRect(realX(dp + i * dw), realY(0), dw, dh + fontHeight * 0.7);
else ctx.fillRect(realX(dp + i * dw), realY(0), dw, dh);
const isBlack = this.bandcode[i] === "1";
const xPos = realX(dp + i * dw);
if (isBlack) {
blackCount++;
if (blackStartPosition == -1) {
blackStartPosition = xPos;
}
if (!long && this.encoding === "EAN13" && EAN13_LONG_IDX.includes(i)) {
long = true;
}
if (blackStartPosition!= -1 && i === this.bandcode.length - 1) {
ctx.fillRect(blackStartPosition, realY(0), dw * blackCount, long ? dh + fontHeight * 0.7 : dh);
}
} else {
ctx.fillRect(blackStartPosition, realY(0), dw * blackCount, long ? dh + fontHeight * 0.7 : dh);
blackStartPosition = -1;
blackCount = 0;
long = false;
}
}

2
niimblue/src/utils/image_editor_utils.ts
View File

@@ -140,7 +140,7 @@ export class ImageEditorUtils {
public static addBarcode(canvas: fabric.Canvas): void {
const barcode = new Barcode({
text: "1234567890128",
width: ImageEditorUtils.SIZE_DEFAULT * 2,
width: (canvas.width ?? ImageEditorUtils.SIZE_DEFAULT) - ImageEditorUtils.OBJECT_DEFAULTS.left,
height: ImageEditorUtils.SIZE_DEFAULT,
encoding: "EAN13",
});