element-plus/lib/components/watermark/src/useClips.js

A Component Library for Vue 3

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var shared = require('@vue/shared');

const FontGap = 3;
function prepareCanvas(width, height, ratio = 1) {
  const canvas = document.createElement("canvas");
  const ctx = canvas.getContext("2d");
  const realWidth = width * ratio;
  const realHeight = height * ratio;
  canvas.setAttribute("width", `${realWidth}px`);
  canvas.setAttribute("height", `${realHeight}px`);
  ctx.save();
  return [ctx, canvas, realWidth, realHeight];
}
function useClips() {
  function getClips(content, rotate, ratio, width, height, font, gapX, gapY) {
    const [ctx, canvas, contentWidth, contentHeight] = prepareCanvas(width, height, ratio);
    if (content instanceof HTMLImageElement) {
      ctx.drawImage(content, 0, 0, contentWidth, contentHeight);
    } else {
      const {
        color,
        fontSize,
        fontStyle,
        fontWeight,
        fontFamily,
        textAlign,
        textBaseline
      } = font;
      const mergedFontSize = Number(fontSize) * ratio;
      ctx.font = `${fontStyle} normal ${fontWeight} ${mergedFontSize}px/${height}px ${fontFamily}`;
      ctx.fillStyle = color;
      ctx.textAlign = textAlign;
      ctx.textBaseline = textBaseline;
      const contents = shared.isArray(content) ? content : [content];
      contents == null ? void 0 : contents.forEach((item, index) => {
        ctx.fillText(item != null ? item : "", contentWidth / 2, index * (mergedFontSize + FontGap * ratio));
      });
    }
    const angle = Math.PI / 180 * Number(rotate);
    const maxSize = Math.max(width, height);
    const [rCtx, rCanvas, realMaxSize] = prepareCanvas(maxSize, maxSize, ratio);
    rCtx.translate(realMaxSize / 2, realMaxSize / 2);
    rCtx.rotate(angle);
    if (contentWidth > 0 && contentHeight > 0) {
      rCtx.drawImage(canvas, -contentWidth / 2, -contentHeight / 2);
    }
    function getRotatePos(x, y) {
      const targetX = x * Math.cos(angle) - y * Math.sin(angle);
      const targetY = x * Math.sin(angle) + y * Math.cos(angle);
      return [targetX, targetY];
    }
    let left = 0;
    let right = 0;
    let top = 0;
    let bottom = 0;
    const halfWidth = contentWidth / 2;
    const halfHeight = contentHeight / 2;
    const points = [
      [0 - halfWidth, 0 - halfHeight],
      [0 + halfWidth, 0 - halfHeight],
      [0 + halfWidth, 0 + halfHeight],
      [0 - halfWidth, 0 + halfHeight]
    ];
    points.forEach(([x, y]) => {
      const [targetX, targetY] = getRotatePos(x, y);
      left = Math.min(left, targetX);
      right = Math.max(right, targetX);
      top = Math.min(top, targetY);
      bottom = Math.max(bottom, targetY);
    });
    const cutLeft = left + realMaxSize / 2;
    const cutTop = top + realMaxSize / 2;
    const cutWidth = right - left;
    const cutHeight = bottom - top;
    const realGapX = gapX * ratio;
    const realGapY = gapY * ratio;
    const filledWidth = (cutWidth + realGapX) * 2;
    const filledHeight = cutHeight + realGapY;
    const [fCtx, fCanvas] = prepareCanvas(filledWidth, filledHeight);
    function drawImg(targetX = 0, targetY = 0) {
      fCtx.drawImage(rCanvas, cutLeft, cutTop, cutWidth, cutHeight, targetX, targetY, cutWidth, cutHeight);
    }
    drawImg();
    drawImg(cutWidth + realGapX, -cutHeight / 2 - realGapY / 2);
    drawImg(cutWidth + realGapX, +cutHeight / 2 + realGapY / 2);
    return [fCanvas.toDataURL(), filledWidth / ratio, filledHeight / ratio];
  }
  return getClips;
}

exports.FontGap = FontGap;
exports["default"] = useClips;
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