var utils = {
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uniqueInArray(arr) {
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//去重
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var n = {},
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r = [];
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for (var i = 0; i < arr.length; i++) {
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if (!n[arr[i]]) {
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n[arr[i]] = true;
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r.push(arr[i]);
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}
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}
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return r;
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},
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uniqueInArrayObject(arr) {
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//数组对象去重 根据数组对象中的某个唯一的键名去重
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let n = [],
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r = {};
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arr.forEach(ele => {
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if (!r[ele.ID]) {
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n.push(ele)
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r[ele.ID] = true
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}
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});
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return n;
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},
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getLabelInArray(arr, key) {
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let label = null;
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arr.forEach(item => {
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if (item.value == key) {
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label = item.label
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}
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});
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return label
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},
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getValueInArray(arr, key) {
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let value = null;
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arr.forEach(item => {
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if (item.label == key) {
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value = item.value
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}
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});
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return value
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},
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//给图片添加水印
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getImgWaterMark({
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url = '',
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textAlign = 'left',
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textBaseline = 'middle',
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font = '18px Microsoft Yahei',
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fillStyle = 'rgba(0, 0, 0, 0.15)',
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// fillStyle = '#aaaaaa',
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content = 'Eventech',
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cb = null,
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} = {}) {
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// 创建所需要添加水印的img图片
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const canvas = document.createElement('canvas')
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const ctx = canvas.getContext('2d')
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//console.log(url, 58)
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let watermark = new Image()
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watermark.src = "static/img/watermark/default.png"
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watermark.crossOrigin = 'anonymous'
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const img = new Image()
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img.src = url
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img.crossOrigin = 'anonymous'
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img.onload = function() {
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// 创建canvas，并将创建的img绘制成canvas
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canvas.width = img.width
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canvas.height = img.height
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ctx.drawImage(img, 0, 0)
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ctx.drawImage(watermark, img.width / 2, 10) //上
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ctx.drawImage(watermark, 0, img.height / 2) //左
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ctx.drawImage(watermark, img.width / 2, (img.height - 120)) //下
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ctx.drawImage(watermark, (img.width - 120), img.height / 2) //右
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ctx.textAlign = textAlign
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ctx.textBaseline = textBaseline
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ctx.font = font
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ctx.fillStyle = fillStyle
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ctx.globalAlpha = 0.3;
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ctx.rotate((Math.PI / 180) * 15)
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// 循环绘制水印
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// ctx.fillText(content, img.width - textX, img.height - textY)
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// for (let i = 0; i < img.height / 120; i++) {
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// for (let j = 0; j < img.width / 65; j++) {
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// ctx.fillText(content, i * 300, j * 200, img.width)
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// }
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// }
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// 将绘制完成的canvas转换为base64的地址
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const base64Url = canvas.toDataURL()
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cb && cb(base64Url)
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}
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},
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}
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export default utils
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