element-ui Mark the coordinate points after uploading the picture

<template>
    <div class="mapForm">
        <div class="left">
            <el-form ref="form" :model="form" :rules="rules" label-width="160px">
                <el-form-item label="Map Name" prop="mapName">
                    <el-input v-model="form.mapName" size="mini" clearable class="formInputClass"></el-input>
                </el-form-item>
                <el-form-item label="Map description" prop="remarks">
                    <el-input type="textarea" v-model="form.remarks" size="mini" clearable class="formInputClass"></el-input>
                </el-form-item>
                <el-form-item label="Point information" prop="" v-if="mapList.length > 0">
                    <div class="mapContent">
                        <div v-for="(map,key) in mapList" :key="key">
                            <div class="pointAbscissaOrdinate"><span>Point coordinates {{key+1}}: {{map.abscissa}}-{{map.ordinate}}</span></div>
                            <el-select v-model="mapList[key]['point']" placeholder="Please select" class="selectClass" @change="changePoint">
                                <el-option v-for="(item, key) in pointList" :key="key" :label="item.name" :value="item.point">
                                </el-option>
                            </el-select>
                        </div>
                    </div>
                </el-form-item>
                <div class="btn">
                    <el-button @click="checkParams" type="primary">Submit</el-button>
                </div>
            </el-form>
        </div>
        <div class="right" id="">
            <div class="imgDiv" id="imgDiv" v-loading="loadStage">
                <img :src="fileSrc" width="1100" height="720" id="imgPainter" />
                <div class="marker" v-for="(item, key) in mapList" :key="key" :style="{top: item.ordinate+'px', 'left': item.abscissa+'px'}" @contextmenu.prevent="clearMarker(key)">
                    {{key+1}}
                    <div class="ponint">{{item.point}}</div>
                </div>
            </div>
            <div class="uploadBtn">
                <el-upload class="upload-demo" ref="upload" action="" :on-change="handleChange" :show-file-list="false" :on-remove="handleRemove" :auto-upload="false" style="display:inline-block;">
                    <el-button slot="trigger" size="mini" type="primary">Select file</el-button>
                </el-upload>
                <el-button @click="clearPic" type="danger">Clear all points</el-button>
            </div>
            <div class="info"><i class="el-icon-info"></i>Display size is 1100px*720px</div>
            <div class="info"><i class="el-icon-info"></i>Left mouse button punctuation in the picture frame</div>
            <div class="info"><i class="el-icon-info"></i>Right-click the marked point in the picture frame to delete the point</div>
        </div>
    </div>
</template>
<script>
export default {
    name: 'mapFormComponent',
    data() {
        return {
            form: {
                mapName: "",
            },
            rules:
                mapName: [
                    { required: true, message: "Please enter a map name", trigger: "blur" },
                ],
            },
            fileList: [],
            fileSrc: '',
            pointList: [
                { name: "Discharge port 1", point: "@FQ01" },
                { name: "Discharge port 2", point: "@FQ02" },
            ],
            mapList: [], //Array of zebra crossings canBiaoZhu: true, //Can it be marked pointColor: 'red', //Point color pointSize: 20, //Point size pointSelectList: {},
            notifyId: {},
            loadStage: false,
        };
    },
    created() { },
    mounted() {
        //Drawing area event binding let _this = this;
        if (document.getElementById('imgPainter')) {
            document.getElementById('imgPainter').onmousedown = (e) => {
                e = e || window.event
                if (e.button !== 2) { //Judge whether to right-click if (this.canBiaoZhu && this.fileSrc != '') { //Judge whether it is possible to mark and upload pictures var x = e.offsetX || e.layerX
                        var y = e.offsetY || e.layerY
                        this.mapList.push({
                            id: this.mapList.length + 1,
                            name: '',
                            abscissa: x,
                            coordinate: y,
                        })
                        // Set variables // this.pointSelectList.$set(0);
                        let key = `point`;
                        _this.$set(this.mapList[this.mapList.length - 1], key, "")
                    } else {
                        //Prompt to upload a picture// Only display once if (_this.notifyId.id)
                            _this.notifyId.close();
                        this.notifyId = _this.$notify.error({
                            title: 'Prompt information',
                            message: 'Please upload the image first and then add punctuation',
                            showClose: true,
                        });
                    }
                } else {
                    return false
                }
            }
        }
        // Right click to prevent var oDiv1 = document.getElementById('imgDiv');
        oDiv1.oncontextmenu = function (ev) {
            var e = e || window.event;
            //Prevent bubbling e.cancelBubble = true;
            //Prevent triggering of default event e.returnValue = false;
        }
    },
    methods: {
        changePoint() {
            /**point change */
            this.$forceUpdate();
        },
        clearMarker(index) {
            /**Clear marker */
            this.mapList.splice(index, 1);
        },
        handleChange(file, fileList) {
            this.loadStage = true;
            let fileName = file.name;
            let regex = /(.jpg|.jpeg|.gif|.png|.bmp)$/;
            if (regex.test(fileName.toLowerCase())) {
                this.fileSrc = URL.createObjectURL(file.raw) // Get the URL
                console.log(this.fileSrc);
            } else {
                this.$message.error('Please select the image file');
            }
            this.loadStage = false;
        },
        clearPic() {
            /**Clear image*/
            this.mapList = [];
        },
        checkParams() {
            /***
             * Verify submission information */
            this.$refs["form"].validate((valid) => {
                if (valid) {
                    let params = this.form;
                    this.submit(params);
                }
            });
        },
        async submit(params) {
            /**submit*/
            let resp = await this.$api.companyApiList
                .addEditCompany(params);
            if (resp.data.code != "error") {
                // Determine whether to add or modify this.$notify.success({
                    title: "Tips",
                    message: resp.data.msg,
                    showClose: true,
                });
                let type = params.id && params.id != '' ? 'edit' : 'add';
                this.$emit("update", type);
                // Clear form data this.$refs.form.resetFields();
            }
        },
    },
};
</script>
<style scoped lang="less">
/**
  Form style*/
.mapForm {
    display: flex;
    padding: 10px;
    border: 1px solid pink;
    .left {
        flex: 2;
        border-right: 1px dashed pink;
        margin-right: 4px;
        .mapContent {
            height: 700px;
            overflow-y: auto;
            .selectClass {
                margin: 0px 5px;
            }
            .pointAbscissaOrdinate {
                display: inline-block;
                width: 140px;
            }
        }
    }
    .right {
        flex: 8;
        // border: 1px solid pink;
        max-width: 1100px;
        .imgDiv {
            position: relative;
            height: 720px;
            border: 2px solid cornflowerblue;
            .marker {
                position: absolute;
                border-radius: 50%;
                z-index: 999;
                width: 20px;
                height: 20px;
                background-color: red;
                text-align: center;
                line-height: 20px;
                color: yellow;
                .ponint {
                    display: block;
                    position: absolute;
                    left: 20px;
                    top: 0px;
                    font-size: 12px;
                    color: blue;
                }
            }
            .marker:hover .ponint {
                display: block;
            }
        }
        .info {
            font-size: 12px;
        }
        .uploadBtn {
            margin: 10px 0px;
        }
    }
    .btn {
        padding-left: 160px;
    }
}
.formInputClass {
    width: 200px;
}
</style>