83 lines
3.3 KiB
TypeScript
83 lines
3.3 KiB
TypeScript
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import type { Point, Rect } from "@/db/schema";
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// พิกัดทุกอย่างที่เก็บลง DB เป็น % ของขนาดหน้า PDF (PLAN.md §2, CLAUDE.md invariant #2)
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// ทิศทางแปลง: px → % = ÷size×100, % → px = ×size÷100 — ผ่านไฟล์นี้เท่านั้น
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// Point/Rect define ที่ db/schema.ts (PLAN-FEAT.md §1) แล้ว re-export ที่นี่
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export type { Rect, Point };
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export type Size = { width: number; height: number };
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export const toPercent = (px: number, size: number): number => (px / size) * 100;
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export const toPx = (percent: number, size: number): number => (percent / 100) * size;
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export const clamp = (value: number, min: number, max: number): number =>
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Math.min(Math.max(value, min), max);
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export const pointToPercent = (p: Point, size: Size): Point => ({
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x: toPercent(p.x, size.width),
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y: toPercent(p.y, size.height),
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});
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export const pointToPx = (p: Point, size: Size): Point => ({
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x: toPx(p.x, size.width),
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y: toPx(p.y, size.height),
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});
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export const rectToPercent = (r: Rect, size: Size): Rect => ({
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x: toPercent(r.x, size.width),
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y: toPercent(r.y, size.height),
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width: toPercent(r.width, size.width),
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height: toPercent(r.height, size.height),
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});
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export const rectToPx = (r: Rect, size: Size): Rect => ({
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x: toPx(r.x, size.width),
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y: toPx(r.y, size.height),
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width: toPx(r.width, size.width),
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height: toPx(r.height, size.height),
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});
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export const pathToPercent = (path: Point[], size: Size): Point[] =>
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path.map((p) => pointToPercent(p, size));
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export const pathToPx = (path: Point[], size: Size): Point[] =>
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path.map((p) => pointToPx(p, size));
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/** พิกัด pointer จาก event เทียบ page element → % (clamp 0–100 เสมอ) */
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export function getPointerPercent(
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e: { clientX: number; clientY: number },
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pageEl: HTMLElement,
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): Point {
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const rect = pageEl.getBoundingClientRect();
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return {
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x: clamp(toPercent(e.clientX - rect.left, rect.width), 0, 100),
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y: clamp(toPercent(e.clientY - rect.top, rect.height), 0, 100),
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};
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}
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/**
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* รวบ rects ที่อยู่บรรทัดเดียวกัน (แนวตั้ง overlap กัน = y/height ใกล้กัน)
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* เหลือ 1 rect ต่อบรรทัด โดย union แกน x ให้ครอบข้อความเดิมทั้งบรรทัด
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* เรียกทุกครั้งก่อนบันทึก HIGHLIGHT ลง DB กัน JSONB บวม
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*/
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export function mergeRectsByLine(rects: Rect[]): Rect[] {
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const sorted = [...rects].sort((a, b) => a.y - b.y || a.x - b.x);
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const merged: Rect[] = [];
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for (const r of sorted) {
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const last = merged[merged.length - 1];
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if (last && r.y < last.y + last.height) {
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// บรรทัดเดียวกัน → ขยายกรอบเดิมให้ครอบ rect นี้ด้วย
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const right = Math.max(last.x + last.width, r.x + r.width);
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last.x = Math.min(last.x, r.x);
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last.width = right - last.x;
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const bottom = Math.max(last.y + last.height, r.y + r.height);
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last.height = bottom - last.y;
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} else {
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merged.push({ ...r });
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}
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}
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return merged;
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}
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