drawingCanvas: any = ref<HTMLCanvasElement | null>(null); 74 const backgroundCanvas: any = ref(null); 75 const ctx: any = ref<CanvasRenderingContext2D | null>(null); 76 const bgCtx: any = ref<CanvasRenderingContext2D | null>(null); 77 const popoverRef = ref() 78 const drawing =...
在Vue 3中使用Canvas,你可以按照以下步骤进行: 1. 在Vue3项目中安装并引入相关canvas库(可选) 虽然Vue 3本身并不直接提供Canvas的封装库,但你可以使用原生的Canvas API,或者引入一些第三方库来简化Canvas的操作。不过,对于基本的Canvas使用,原生的API已经足够强大。如果你需要更高级的功能,可以考虑引入如fabric.js、...
为了在 Vue3 项目中实现移动端手写板,首先需要在组件中引入 canvas 元素。可以使用<canvas>标签或者动态创建 canvas 元素。 然后,需要在 Vue3 组件的mounted钩子函数中获取到 canvas 元素,并设置其宽高等属性。也可以在样式中设置 canvas 的宽高,并使用window.devicePixelRatio获取高清屏的设备像素比。 接下来,可以...
<script setup> import { onMounted, ref } from 'vue' const canvas = ref(null); let ctx = ref(); const initContext = () => { ctx = canvas.value.getContext('2d'); } let isDrawing = false; let lastX = 0; let lastY = 0; // 重新写 let clearBtn = ref(null); onMounted(()...
from 'vue'; const canvas = ref(null); const state=reactive({ dialogVisible:false, dataURL:'', signOptions: { penColor: '#000000', lineWidth: 2, }, }) let isDrawing = false; let lastX = 0; let lastY = 0; /* 初始化画布 */ const initCanvas = () => { const ctx = canvas...
vue3.0+canvas实现签名 <template> <div> <canvas ref="canvas" @mousedown="startDrawing" @mousemove="draw" @mouseup="finishDrawing" @touchstart="startDrawing" @touchmove="draw" @touchend="finishDrawing"></canvas> <button @click="clear">Clear</button> <button @click="save">Sav...
canvas JavaScript Canvas is a web technology that allows you to dynamically draw and manipulate graphics on a webpage using JavaScript. With Canvas, you can create complex graphics, animations, and interactive applications that respond to user input. It is a 2D drawing API that provides a set ...
vue3实现电子签名的方法,vue3实现电子签名且对电子签名可进行修改画笔粗细、画笔颜色、撤销、清屏、保存等功能。第一种:通过canvas<divclass="signaturePad-Boxw100h100flex-center"><el-spaceclass="mb10"size="large"><div><el-text>画笔粗细:
JavaScript Canvas is a web technology that allows you to dynamically draw and manipulate graphics on a webpage using JavaScript. With Canvas, you can create complex graphics, animations, and interactive applications that respond to user input. It is a 2D drawing API that provides a set of metho...
1)定义 const isDrawing = ref(false); mousedown的时候true mouseup的时候false 2)watch中来监听这个值:然后取值: watch(signatureCanvas, (newValue, oldValue) =>{ctx.value = signatureCanvas.value.getContext('2d'); }); 最后上一个开源的: