ant-design-vue/components/watermark/utils.ts

import type { CSSProperties } from 'vue';
/** converting camel-cased strings to be lowercase and link it with Separato */
export function toLowercaseSeparator(key: string) {
  return key.replace(/([A-Z])/g, '-$1').toLowerCase();
}

export function getStyleStr(style: CSSProperties): string {
  return Object.keys(style)
    .map((key: keyof CSSProperties) => `${toLowercaseSeparator(key)}: ${style[key]};`)
    .join(' ');
}

/** Returns the ratio of the device's physical pixel resolution to the css pixel resolution */
export function getPixelRatio() {
  return window.devicePixelRatio || 1;
}

/** Rotate with the watermark as the center point */
export function rotateWatermark(
  ctx: CanvasRenderingContext2D,
  rotateX: number,
  rotateY: number,
  rotate: number,
) {
  ctx.translate(rotateX, rotateY);
  ctx.rotate((Math.PI / 180) * Number(rotate));
  ctx.translate(-rotateX, -rotateY);
}

/** Whether to re-render the watermark */
export const reRendering = (mutation: MutationRecord, watermarkElement?: HTMLElement) => {
  let flag = false;
  // Whether to delete the watermark node
  if (mutation.removedNodes.length) {
    flag = Array.from(mutation.removedNodes).some(node => node === watermarkElement);
  }
  // Whether the watermark dom property value has been modified
  if (mutation.type === 'attributes' && mutation.target === watermarkElement) {
    flag = true;
  }
  return flag;
};