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235 lines
4.4 KiB
Vue
235 lines
4.4 KiB
Vue
<template>
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<form v-if="editing" class="edit">
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<textarea v-model="style"></textarea>
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<button @click="edit">Confirm</button>
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<button @click.prevent="remove"> X </button>
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</form>
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<svg ref="container" id="container" @mousedown="startDrawing" @mousemove="moveDrawing" @mouseup="stopDrawing">
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<path
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v-for="(p, index) in paths"
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:key="p.path"
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:d="p.path"
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:style="p.style"
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stroke-width="1px"
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stroke="currentColor"
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fill="none"
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@click="select(p, index)"
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/>
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</svg>
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</template>
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<script setup>
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import {ref, computed, onMounted} from 'vue'
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let style = ref("color: white; fill: white; stroke-width: 4px;")
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const editing = ref(false)
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const currentIndex = ref(0)
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const edit = () => {
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paths.value[currentIndex.value].style = style.value
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currentIndex.value = null
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editing.value = false;
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}
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const select = (p, index) => {
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editing.value = true
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currentIndex.value = index
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if (p.style != "") {
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style.value = p.style
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}
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}
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const remove = () => {
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paths.value.splice(currentIndex.value, 1)
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editing.value = false
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}
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const container = ref(null)
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const paths = ref([])
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let rect = null
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let path = null
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let strPath = ""
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let buffer = []
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const bufferSize = 10
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const width = ref(0)
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const height = ref(0)
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const setViewBox = () => container.value.setAttribute('viewBox', `0 0 ${container.value.clientWidth} ${container.value.clientHeight}`)
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class Drawing {
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path = ""
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style = "color: white; stroke-width: 4px;"
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constructor (path) {
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this.path = path
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}
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}
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onMounted(()=>{
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width.value = container.value.clientWidth
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height.value = container.value.clientHeight
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rect = container.value.getBoundingClientRect()
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setViewBox()
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window.addEventListener("resize", ()=> setViewBox())
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})
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const getMousePosition = (e) => {
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return {
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x: e.pageX - rect.left,
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y: e.pageY - rect.top
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}
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}
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const appendToBuffer = (pt) => {
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buffer.push(pt);
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while (buffer.length > bufferSize) {
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buffer.shift();
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}
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}
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// Calculate the average point, starting at offset in the buffer
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const getAveragePoint = function (offset) {
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var len = buffer.length;
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if (len % 2 === 1 || len >= bufferSize) {
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var totalX = 0;
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var totalY = 0;
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var pt, i;
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var count = 0;
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for (i = offset; i < len; i++) {
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count++;
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pt = buffer[i];
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totalX += pt.x;
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totalY += pt.y;
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}
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return {
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x: totalX / count,
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y: totalY / count,
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};
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}
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return null;
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};
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const updateSvgPath = function () {
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var pt = getAveragePoint(0);
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if (pt) {
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// Get the smoothed part of the path that will not change
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strPath += " L" + pt.x + " " + pt.y;
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// Get the last part of the path (close to the current mouse position)
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// This part will change if the mouse moves again
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var tmpPath = "";
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for (var offset = 2; offset < buffer.length; offset += 2) {
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pt = getAveragePoint(offset);
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tmpPath += " L" + pt.x + " " + pt.y;
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}
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// Set the complete current path coordinates
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paths.value[paths.value.length-1].path = strPath + tmpPath;
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}
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};
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const startDrawing = (e) => {
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buffer = []
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let pt = getMousePosition(e)
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appendToBuffer(pt)
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strPath = "M" + pt.x + " " + pt.y
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path = new Drawing(strPath)
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paths.value.push(path)
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}
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const moveDrawing = (e) => {
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if (!path) return
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appendToBuffer(getMousePosition(e))
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updateSvgPath()
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}
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const stopDrawing = (e) => {
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if (!path) return
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path = null
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strPath = ""
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paths.value[paths.value.length-1].style += " fill: white;"
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}
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</script>
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<style>
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#container {
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position: absolute;
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top: 0;
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left: 0;
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width: 100vw;
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height: 100vh;
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background: black;
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}
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path {
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color: white;
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pointer-events: all;
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cursor: pointer;
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}
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.edit {
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color: white;
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position: absolute;
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padding: 32px;
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z-index: 10000;
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}
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.edit textarea {
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background: none;
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color: white;
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border: none;
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display: block;
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font-size: 24px;
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line-height: 1.4;
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margin-bottom: 32px;
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width: 500px;
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border-left: 1px solid white;
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padding-left: 1ch;
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}
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.edit button {
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background: none;
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border: 1px solid white;
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color: white;
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font-size: 16px;
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border-radius: 50%;
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padding: 8px 16px;
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font-weight: bold;
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cursor: pointer;
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}
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.edit button + button {
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margin-left: 8px;
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}
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.edit button:hover {
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background-color: white;
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color: black;
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}
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</style>
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