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日期:2021-01-19 类型:科技新闻 我要分享
关键词:通道抠图,怎么在图片上编辑文字,创客贴作图神器,免费图片设计制作在线,背景透明图制作
许多买东西网站如今都适用360商品全景图图象,能够360度随意挑选查询样品,这样对选购者来讲是1个很好的消費体验,在网上有许多这样的软件全是根据jQuery完成的有收费的也是有完全免费的,实际上很功能强大的1个叫3deye.js的软件。该软件适用桌面上与挪动终端设备iOS与Android, 它的demo程序流程:http://www.voidcanvas.com/demo/28823deye/
自身玩了玩这个Demo之后,照着它的思路,用HTML5 Canvas也完成了相近的作用。
因此先说1下它的360度全景图图的基本原理
1. 最先必须对商品照相,间距是每张相片转动15度,因此必须23张相片。
2.相片提前准备好了之后,尽可能挑选JPG文件格式,剪裁到适度尺寸。
3.JavaScript中预载入全部相片,能够相互配合进度条显示信息载入精度
4.建立/获得Canvas目标,再加电脑鼠标监视恶性事件,当电脑鼠标上下挪动情况下,适当的绘图不一样帧。大概的基本原理便是这样,简易吧!
完成编码:
<!DOCTYPE html> <html> <head> <meta charset=utf⑻"> <title>Full 360 degree View</title> <script> var ctx = null; // global variable 2d context var frame = 1; // 23 var width = 0; var height = 0; var started = false; var images = new Array(); var startedX = ⑴; window.onload = function() { var canvas = document.getElementById("fullview_canvas"); canvas.width = 440;// window.innerWidth; canvas.height = 691;//window.innerHeight; width = canvas.width; height = canvas.height; var bar = document.getElementById('loadProgressBar'); for(var i=1; i<24; i++) { bar.value = i; if(i<10) { images[i] = new Image(); images[i].src = "0" + i + ".jpg"; } else { images[i] = new Image(); images[i].src = i + ".jpg"; } } ctx = canvas.getContext("2d"); // mouse event canvas.addEventListener("mousedown", doMouseDown, false); canvas.addEventListener('mousemove', doMouseMove, false); canvas.addEventListener('mouseup', doMouseUp, false); // loaded(); // frame = 1 frame = 1; images[frame].onload = function() { redraw(); bar.style.display = 'none'; } } function doMouseDown(event) { var x = event.pageX; var y = event.pageY; var canvas = event.target; var loc = getPointOnCanvas(canvas, x, y); console.log("mouse down at point( x:" + loc.x + ", y:" + loc.y + ")"); startedX = loc.x; started = true; } function doMouseMove(event) { var x = event.pageX; var y = event.pageY; var canvas = event.target; var loc = getPointOnCanvas(canvas, x, y); if (started) { var count = Math.floor(Math.abs((startedX - loc.x)/30)); var frameIndex = Math.floor((startedX - loc.x)/30); while(count > 0) { console.log("frameIndex = " + frameIndex); count--; if(frameIndex > 0) { frameIndex--; frame++; } else if(frameIndex < 0) { frameIndex++; frame--; } else if(frameIndex == 0) { break; } if(frame >= 24) { frame = 1; } if(frame <= 0) { frame = 23; } redraw(); } } } function doMouseUp(event) { console.log("mouse up now"); if (started) { doMouseMove(event); startedX = ⑴; started = false; } } function getPointOnCanvas(canvas, x, y) { var bbox = canvas.getBoundingClientRect(); return { x: x - bbox.left * (canvas.width / bbox.width), y: y - bbox.top * (canvas.height / bbox.height) }; } function loaded() { setTimeout( update, 1000/8); } function redraw() { // var imageObj = document.createElement("img"); // var imageObj = new Image(); var imageObj = images[frame]; ctx.clearRect(0, 0, width, height) ctx.drawImage(imageObj, 0, 0, width, height); } function update() { redraw(); frame++; if (frame >= 23) frame = 1; setTimeout( update, 1000/8); } </script> </head> <body> <progress id="loadProgressBar" value="0" max="23"></progress> <canvas id="fullview_canvas"></canvas> <button onclick="loaded()">Auto Play</button> </body> </html>
Demo演试文档免费下载详细地址-> fullview_jb51.rar
以上便是本文的所有內容,期待对大伙儿的学习培训有一定的协助,也期待大伙儿多多适用脚本制作之家。
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