我通过在Xcode中使用一个html文件进行展示我发现将很多图片进行循环可以展示出3D全景效果接下来我们深入研究一下如何使用html和JS代码将全景地图效果展示出来

1.我们需要在Xcode中创建一个html文件

//写入这句代码使用来声明html文件的

2.

这三句代码就是html文件的标签元素跟我理解的xml文件标签元素是一样的

注意:

Full 360 degree View这句代码设置html文件在预览器中的标题

3.接下来我们需要深一步了解JS代码

首先我们创建JS标签 然后我们将在标签中写入JS用来展示全景效果图此处注意所有JS标签全部被html标签所包含所有JS代码全部被JS标签包含(包含也就是放到标签里面去)

var ctx = null; // 显示证书全局变量2 d上下文

var frame = 1; // 设置位置信息

var width = 0;//宽度

var height = 0;//高度

var started = false;//判断是否开始

var images = new Array();//设置图片数组

var startedX = -1;

//设置函数体

window.onload = function() {

var canvas = document.getElementById("fullview_canvas");

canvas.width = 440;//宽度/帆;

canvas.height = 691;//高度/帆;

width = canvas.width;//设置宽度帆

height = canvas.height;//设置高度帆

//等到元素loadProgressBar

var bar = document.getElementById('loadProgressBar');

//循环图片数组images

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");//获得2d证书内容

// 通过鼠标滑动网页进行滚动图片操作(必须在图片开启滚动的情况)

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 = -1;

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);

}

//设置标签元素进度条最大值为23

//设置函数标签元素

//设置按钮点击函数体和按钮标题

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