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-<!-- TODO @lesan:看着没啥问题,哈哈哈,我还搜了下;嘿嘿,有没人封装好了组件库哈?https://github.com/WangShayne/vue3-signature (https://www.npmjs.com/package/vue3-signature) -->
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-<template>
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- <div style="position: relative">
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- <canvas
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- ref="canvasRef"
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- @mousedown="mouseDown"
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- @mousemove="mouseMove"
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- @mouseup="mouseUp"
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- @touchstart="touchStart"
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- @touchmove="touchMove"
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- @touchend="touchEnd"
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- style="border: 1px solid lightgrey; max-width: 100%; display: block"
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- >
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- </canvas>
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-
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- <el-button
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- style="position: absolute; bottom: 20px; right: 10px"
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- type="primary"
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- text
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- size="small"
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- @click="reset"
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- >
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- <Icon icon="ep:delete" class="mr-5px" />清除
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- </el-button>
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- </div>
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-</template>
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-
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-<script lang="ts" setup>
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-import { propTypes } from '@/utils/propTypes'
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-
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-defineOptions({ name: 'ESign' })
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-
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-const emits = defineEmits(['update:bgColor'])
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-const props = defineProps({
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- // 画布宽度,即导出图片的宽度
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- width: propTypes.number.def(900),
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- // 画布高度,即导出图片的高度
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- height: propTypes.number.def(400),
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- // 画笔粗细
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- lineWidth: propTypes.number.def(10),
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- // 画笔颜色
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- lineColor: propTypes.string.def('#000000'),
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- // 画布背景色,为空时画布背景透明
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- bgColor: propTypes.string.def(''),
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- // 是否裁剪,在画布设定尺寸基础上裁掉四周空白部分
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- isCrop: propTypes.bool.def(false),
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- // 清空画布时是否同时清空设置的背景色
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- isClearBgColor: propTypes.bool.def(true),
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- // 生成图片格式
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- format: propTypes.string.def('image/png'),
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- // 生成图片质量,0 到 1
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- quality: propTypes.number.def(1)
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-})
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-const canvasRef = ref()
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-const hasDrew = ref(false)
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-const resultImg = ref('')
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-const points = ref<any>([])
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-const canvasTxt = ref()
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-const startX = ref(0)
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-const startY = ref(0)
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-const isDrawing = ref(false)
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-const sratio = ref(1)
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-
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-const ratio = computed(() => {
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- return props.height / props.width
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-})
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-const stageInfo = computed(() => {
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- return canvasRef.value.getBoundingClientRect()
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-})
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-const bgColor = computed(() => {
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- return props.bgColor ? props.bgColor : 'rgba(255, 255, 255, 0)'
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-})
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-
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-watch(
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- () => bgColor.value,
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- () => {
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- if (canvasRef.value) {
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- canvasRef.value.style.background = bgColor.value
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- }
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- },
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- {
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- immediate: true
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- }
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-)
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-
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-const resizeHandler = () => {
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- const canvas = canvasRef.value
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- canvas.style.width = props.width + 'px'
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- const realw = parseFloat(window.getComputedStyle(canvas).width)
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- canvas.style.height = ratio.value * realw + 'px'
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- canvasTxt.value = canvas.getContext('2d')
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- canvasTxt.value.scale(1 * sratio.value, 1 * sratio.value)
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- sratio.value = realw / props.width
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- canvasTxt.value.scale(1 / sratio.value, 1 / sratio.value)
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-}
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-// For PC
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-const mouseDown = (e) => {
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- e.preventDefault()
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- isDrawing.value = true
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- hasDrew.value = true
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- let obj = {
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- x: e.offsetX,
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- y: e.offsetY
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- }
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- drawStart(obj)
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-}
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-const mouseMove = (e) => {
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- e.preventDefault()
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- if (isDrawing.value) {
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- let obj = {
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- x: e.offsetX,
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- y: e.offsetY
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- }
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- drawMove(obj)
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- }
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-}
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-const mouseUp = (e) => {
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- e.preventDefault()
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- let obj = {
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- x: e.offsetX,
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- y: e.offsetY
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- }
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- drawEnd(obj)
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- isDrawing.value = false
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-}
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-// For Mobile
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-const touchStart = (e) => {
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- e.preventDefault()
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- hasDrew.value = true
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- if (e.touches.length === 1) {
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- let obj = {
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- x: e.targetTouches[0].clientX - canvasRef.value.getBoundingClientRect().left,
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- y: e.targetTouches[0].clientY - canvasRef.value.getBoundingClientRect().top
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- }
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- drawStart(obj)
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- }
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-}
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-const touchMove = (e) => {
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- e.preventDefault()
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- if (e.touches.length === 1) {
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- let obj = {
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- x: e.targetTouches[0].clientX - canvasRef.value.getBoundingClientRect().left,
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- y: e.targetTouches[0].clientY - canvasRef.value.getBoundingClientRect().top
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- }
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- drawMove(obj)
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- }
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-}
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-const touchEnd = (e) => {
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- e.preventDefault()
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- if (e.touches.length === 1) {
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- let obj = {
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- x: e.targetTouches[0].clientX - canvasRef.value.getBoundingClientRect().left,
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- y: e.targetTouches[0].clientY - canvasRef.value.getBoundingClientRect().top
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- }
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- drawEnd(obj)
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- }
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-}
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-// 绘制
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-const drawStart = (obj) => {
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- startX.value = obj.x
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- startY.value = obj.y
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- canvasTxt.value.beginPath()
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- canvasTxt.value.moveTo(startX.value, startY.value)
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- canvasTxt.value.lineTo(obj.x, obj.y)
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- canvasTxt.value.lineCap = 'round'
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- canvasTxt.value.lineJoin = 'round'
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- canvasTxt.value.lineWidth = props.lineWidth * sratio.value
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- canvasTxt.value.stroke()
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- canvasTxt.value.closePath()
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- points.value.push(obj)
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-}
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-const drawMove = (obj) => {
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- canvasTxt.value.beginPath()
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- canvasTxt.value.moveTo(startX.value, startY.value)
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- canvasTxt.value.lineTo(obj.x, obj.y)
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- canvasTxt.value.strokeStyle = props.lineColor
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- canvasTxt.value.lineWidth = props.lineWidth * sratio.value
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- canvasTxt.value.lineCap = 'round'
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- canvasTxt.value.lineJoin = 'round'
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- canvasTxt.value.stroke()
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- canvasTxt.value.closePath()
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- startY.value = obj.y
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- startX.value = obj.x
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- points.value.push(obj)
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-}
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-const drawEnd = (obj) => {
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- canvasTxt.value.beginPath()
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- canvasTxt.value.moveTo(startX.value, startY.value)
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- canvasTxt.value.lineTo(obj.x, obj.y)
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- canvasTxt.value.lineCap = 'round'
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- canvasTxt.value.lineJoin = 'round'
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- canvasTxt.value.stroke()
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- canvasTxt.value.closePath()
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- points.value.push(obj)
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- points.value.push({ x: -1, y: -1 })
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-}
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-// 生成
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-const generate = (options) => {
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- let imgFormat = options && options.format ? options.format : props.format
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- let imgQuality = options && options.quality ? options.quality : props.quality
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- const pm = new Promise((resolve, reject) => {
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- if (!hasDrew.value) {
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- reject(`Warning: Not Signned!`)
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- return
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- }
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- let resImgData = canvasTxt.value.getImageData(
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- 0,
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- 0,
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- canvasRef.value.width,
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- canvasRef.value.height
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- )
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- canvasTxt.value.globalCompositeOperation = 'destination-over'
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- canvasTxt.value.fillStyle = bgColor.value
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- canvasTxt.value.fillRect(0, 0, canvasRef.value.width, canvasRef.value.height)
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- resultImg.value = canvasRef.value.toDataURL(imgFormat, imgQuality)
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- canvasTxt.value.clearRect(0, 0, canvasRef.value.width, canvasRef.value.height)
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- canvasTxt.value.putImageData(resImgData, 0, 0)
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- canvasTxt.value.globalCompositeOperation = 'source-over'
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- if (props.isCrop) {
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- const crop_area = getCropArea(resImgData.data)
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- let crop_canvas = document.createElement('canvas')
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- const crop_ctx = crop_canvas.getContext('2d')
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- crop_canvas.width = crop_area[2] - crop_area[0]
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- crop_canvas.height = crop_area[3] - crop_area[1]
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- const crop_imgData = canvasTxt.value.getImageData(...crop_area)
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- crop_ctx.globalCompositeOperation = 'destination-over'
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- crop_ctx.putImageData(crop_imgData, 0, 0)
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- crop_ctx.fillStyle = bgColor.value
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- crop_ctx.fillRect(0, 0, crop_canvas.width, crop_canvas.height)
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- resultImg.value = crop_canvas.toDataURL(imgFormat, imgQuality)
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- }
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- resolve(resultImg.value)
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- })
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- return pm
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-}
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-const reset = () => {
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- canvasTxt.value.clearRect(0, 0, canvasRef.value.width, canvasRef.value.height)
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- if (props.isClearBgColor) {
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- emits('update:bgColor', '')
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- canvasRef.value.style.background = 'rgba(255, 255, 255, 0)'
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- }
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- points.value = []
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- hasDrew.value = false
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- resultImg.value = ''
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-}
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-const getCropArea = (imgData) => {
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- let topX = canvasRef.value.width
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- let btmX = 0
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- let topY = canvasRef.value.height
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- let btnY = 0
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- for (let i = 0; i < canvasRef.value.width; i++) {
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- for (let j = 0; j < canvasRef.value.height; j++) {
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- let pos = (i + canvasRef.value.width * j) * 4
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- if (imgData[pos] > 0 || imgData[pos + 1] > 0 || imgData[pos + 2] || imgData[pos + 3] > 0) {
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- btnY = Math.max(j, btnY)
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- btmX = Math.max(i, btmX)
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- topY = Math.min(j, topY)
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- topX = Math.min(i, topX)
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- }
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- }
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- }
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- topX++
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- btmX++
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- topY++
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- btnY++
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- const data = [topX, topY, btmX, btnY]
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- return data
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-}
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-
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-defineExpose({
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- generate
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-})
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-onBeforeMount(() => {
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- window.addEventListener('resize', resizeHandler)
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-})
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-onBeforeUnmount(() => {
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- window.removeEventListener('resize', resizeHandler)
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-})
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-onMounted(() => {
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- canvasRef.value.height = props.height
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- canvasRef.value.width = props.width
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- canvasRef.value.style.background = bgColor.value
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- resizeHandler()
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- // 在画板以外松开鼠标后冻结画笔
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- document.onmouseup = () => {
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- isDrawing.value = false
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- }
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-})
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-</script>
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