我的原图是这个我用drawImage后, 图片是这个这是我的代码 let ctx = uni.createCanvasContext("firstCanvas"); let date = `时间: ${uni.$u.timeFormat( Date.now(), "yyyy-mm-dd hh:MM:ss" )}`; let address = that.locationAddress; let textWidth = ctx.measureText(date).width; let imgWidth ...
这里使用了ref属性来引用canvas元素,方便在JavaScript中操作它。 3. 在Vue 3组件中编写绘制图片的函数 在Vue组件的<script>部分编写一个方法来加载并绘制图片。你可以使用Image对象来加载图片,然后在图片加载完成后使用CanvasRenderingContext2D的drawImage方法将其绘制到canvas上。 vue <script> export de...
bgCanvas = backgroundCanvas.value; 207 208 const finalCanvas = document.createElement('canvas'); 209 finalCanvas.width = bgCanvas.width; 210 finalCanvas.height = bgCanvas.height; 211 const finalCtx = finalCanvas.getContext('2d'); 212 213 // 绘制背景 214 // finalCtx!.drawImage(bgCanvas,...
console.log("初始化canvas"); let canvas= document.getElementById('myCanvas'); let context= canvas.getContext('2d'); const bg=newImage(); bg.src= "../../assets/background.png"; context.drawImage(bg,0,0); console.log('结束') bg.addEventListener("load", () =>{ setInterval(()=>...
// 根据图像重新设定了canvas的长宽 canvas.setAttribute("width",img.width) canvas.setAttribute("height",img.height) // 绘制图片 context.drawImage(img,0,0,img.width,img.height) } } } },1) }, 1. 2. 3. 4. 5. 6. 7. 8. 9.
canvas.width = image.width; canvas.height = image.height; var context = canvas.getContext('2d'); context.drawImage(image, 0, 0, image.width, image.height); var quality = 1; //这里的dataurl就是base64类型 var dataURL = canvas.toDataURL("image/jpeg", quality);//使用toDataUrl将图片转换...
canvas.setAttribute("height",img.height) // 绘制图片 context.drawImage(img,0,0,img.width,img.height) } } } },1) }, context.drawImage()方法的参数介绍,可参照W3school 2.3 绘制矩形 context.strokeStyle = "red" context.lineWidth = 3;
// 获取Canvas 画图letmyCanvas =this.$refs.myCanvasvarctx = myCanvas.getContext('2d')// 在Canvas画布 添加图片varimg =this.$refs.conf0img.onload=() =>{ ctx.drawImage(img,0,0) } AI代码助手复制代码 使用canvas在图片上加上文字 <template><div><imgsrc=""alt=""id="newimage"><canvasid...
<template><div><canvas ref="canvas"></canvas><button @click="draw">生成图片</button></div></template> 然后在Vue3的逻辑中,可以使用ctx.drawImage()方法将需要绘制的图片绘制到画布上。drawImage()方法接受四个参数: image:需要绘制的图像(可以是图片、视频、画布等) ...
},//保存签名handleSave() {//绘制白色背景this.backgroundCtx.fillStyle ="white";this.backgroundCtx.fillRect(0,0,this.backgroundCanvas.width,this.backgroundCanvas.height);//复制绘制的签名到带有白色背景的画布this.backgroundCtx.drawImage(this.drawingCanvas,0,0);//将带有白色背景的画布内容转为PNG格...