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uni_modules/tdesign-uniapp/components/common/shared/qrcode/utils.js

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+import { Ecc } from './qrcodegen';
+// =================== ERROR_LEVEL ==========================
+export const ERROR_LEVEL_MAP = {
+  L: Ecc.LOW,
+  M: Ecc.MEDIUM,
+  Q: Ecc.QUARTILE,
+  H: Ecc.HIGH,
+};
+// =================== DEFAULT_VALUE ==========================
+export const DEFAULT_SIZE = 160;
+export const DEFAULT_LEVEL = 'M';
+export const DEFAULT_BACKGROUND_COLOR = '#FFFFFF';
+export const DEFAULT_FRONT_COLOR = '#000000';
+export const DEFAULT_NEED_MARGIN = false;
+export const DEFAULT_MINVERSION = 1;
+export const SPEC_MARGIN_SIZE = 4;
+export const DEFAULT_MARGIN_SIZE = 0;
+export const DEFAULT_IMG_SCALE = 0.1;
+// =================== UTILS ==========================
+/**
+ * Generate a path string from modules
+ * @param modules
+ * @param margin
+ * @returns
+ */
+export const generatePath = (modules, margin = 0) => {
+  const ops = [];
+  modules.forEach((row, y) => {
+    let start = null;
+    row.forEach((cell, x) => {
+      if (!cell && start !== null) {
+        ops.push(`M${start + margin} ${y + margin}h${x - start}v1H${start + margin}z`);
+        start = null;
+        return;
+      }
+      if (x === row.length - 1) {
+        if (!cell) {
+          return;
+        }
+        if (start === null) {
+          ops.push(`M${x + margin},${y + margin} h1v1H${x + margin}z`);
+        } else {
+          ops.push(`M${start + margin},${y + margin} h${x + 1 - start}v1H${start + margin}z`);
+        }
+        return;
+      }
+      if (cell && start === null) {
+        start = x;
+      }
+    });
+  });
+  return ops.join('');
+};
+/**
+ * Excavate modules
+ * @param modules
+ * @param excavation
+ * @returns
+ */
+export const excavateModules = (modules, excavation) => modules.slice().map((row, y) => {
+  if (y < excavation.y || y >= excavation.y + excavation.h) {
+    return row;
+  }
+  return row.map((cell, x) => {
+    if (x < excavation.x || x >= excavation.x + excavation.w) {
+      return cell;
+    }
+    return false;
+  });
+});
+/**
+ * Get image settings
+ * @param cells The modules of the QR code
+ * @param size The size of the QR code
+ * @param margin
+ * @param imageSettings
+ * @returns
+ */
+export const getImageSettings = (cells, size, margin, imageSettings) => {
+  if (imageSettings == null) {
+    return null;
+  }
+  const numCells = cells.length + margin * 2;
+  const defaultSize = Math.floor(size * DEFAULT_IMG_SCALE);
+  const scale = numCells / size;
+  const w = (imageSettings.width || defaultSize) * scale;
+  const h = (imageSettings.height || defaultSize) * scale;
+  const x = imageSettings.x == null ? cells.length / 2 - w / 2 : imageSettings.x * scale;
+  const y = imageSettings.y == null ? cells.length / 2 - h / 2 : imageSettings.y * scale;
+  const opacity = imageSettings.opacity == null ? 1 : imageSettings.opacity;
+  let excavation = null;
+  if (imageSettings.excavate) {
+    const floorX = Math.floor(x);
+    const floorY = Math.floor(y);
+    const ceilW = Math.ceil(w + x - floorX);
+    const ceilH = Math.ceil(h + y - floorY);
+    excavation = { x: floorX, y: floorY, w: ceilW, h: ceilH };
+  }
+  const { crossOrigin } = imageSettings;
+  return { x, y, h, w, excavation, opacity, crossOrigin };
+};
+/**
+ * Get margin size
+ * @param needMargin Whether need margin
+ * @param marginSize Custom margin size
+ * @returns
+ */
+export const getMarginSize = (needMargin, marginSize) => {
+  if (marginSize != null) {
+    return Math.max(Math.floor(marginSize), 0);
+  }
+  return needMargin ? SPEC_MARGIN_SIZE : DEFAULT_MARGIN_SIZE;
+};
+/**
+ * Check if Path2D is supported
+ */
+export const isSupportPath2d = (() => {
+  try {
+    new Path2D().addPath(new Path2D());
+  } catch (_a) {
+    return false;
+  }
+  return true;
+})();