效果：
首先下载hammer插件http://hammerjs.github.io/
html部分：
<script type="text/javascript" src="js/hammer.min.js"></script>
<div class="resultCon">
<p>人景合成图:</p>
<div class="resultImgCon">
<!--背景图-->
<img src="img/beach.jpg" class="resultBg"/>
<!--人物抠图暂时不知道尺寸-->
<img src="img/shape.png" class="resultP draggable" id="move-box" />
</div>
</div>
js部分：
<script>
var reqAnimationFrame = (function () {
return window[Hammer.prefixed(window, 'requestAnimationFrame')] || function (callback) {
window.setTimeout(callback, 1000 / 60);
};
})();
var el = document.querySelector("#move-box");
var START_X = Math.round((window.innerWidth - el.offsetWidth) / 2);
var START_Y = Math.round((window.innerHeight - el.offsetHeight) / 2)-50;
var ticking = false;
var transform; //图像效果
var timer;
var initAngle = 0; //旋转角度
var initScale = 1; //放大倍数
var mc = new Hammer.Manager(el); //用管理器 可以同时触发旋转 拖拽 移动
//var mc = new Hammer(el); //旋转和移动互斥
/**
ev.srcEvent.type touchstart touchend touchmove
ev.deltaX 手势移动位移变量
*/
mc.add(new Hammer.Pan({ threshold: 0, pointers: 0 }));
mc.add(new Hammer.Rotate({ threshold: 0 })).recognizeWith(mc.get('pan'));
mc.add(new Hammer.Pinch({ threshold: 0 })).recognizeWith([mc.get('pan'), mc.get('rotate')]);
//结束时做一些处理
mc.on("hammer.input", function(ev) {
if(ev.isFinal) {
console.log(START_X+" "+transform.translate.x +" "+ev.deltaX);
START_X = transform.translate.x ;
START_Y = transform.translate.y ;
}
});
mc.on("panstart panmove", onPan);
mc.on("rotatestart rotatemove rotateend", onRotate);
mc.on("pinchstart pinchmove", onPinch);
/**
第二次进入拖拽时 delta位移重置
移动时 初始位置startxy不动。delta增加
*/
function onPan(ev){
if(!ev.isFinal) {
el.className = '';
console.log(START_X +" "+ START_Y +" | "+ev.deltaX +" "+ ev.deltaY);
transform.translate = {
x: START_X + ev.deltaX,
y: START_Y + ev.deltaY
};
requestElementUpdate();
}
}
function onPinch(ev){
if(ev.type == 'pinchstart') {
initScale = transform.scale || 1;
}
el.className = '';
transform.scale = initScale * ev.scale;
requestElementUpdate();
}
//旋转相关
var preAngle =0 ;
var tempAngleFlag=0;
var deltaAngle = 0;
var startRotateAngle = 0;
function onRotate(ev) {
//点下第二个触控点时触发
if(ev.type == 'rotatestart') {
startRotateAngle = ev.rotation ;
tempAngleFlag = 0 ;
}
if(ev.type == 'rotatemove'){
if(tempAngleFlag == 0){
preAngle = startRotateAngle;
tempAngleFlag ++;
}else{
deltaAngle = ev.rotation - preAngle;
el.className = '';
transform.rz = 1; //非0 垂直xy轴
transform.angle =initAngle + deltaAngle;
requestElementUpdate();
}
}
//旋转结束 记录当前图片角度
if(ev.type =='rotateend'){
initAngle = transform.angle;
}
}
function updateElementTransform() {
var value = [
'translate3d(' + transform.translate.x + 'px, ' + transform.translate.y + 'px, 0)',
'scale(' + transform.scale + ', ' + transform.scale + ')',
'rotate3d('+ transform.rx +','+ transform.ry +','+ transform.rz +','+ transform.angle + 'deg)'
];
value = value.join(" ");
el.style.webkitTransform = value; /*为Chrome/Safari*/
el.style.mozTransform = value; /*为Firefox*/
el.style.transform = value; /*IE Opera?*/
ticking = false;
}
function requestElementUpdate() {
if(!ticking) {
reqAnimationFrame(updateElementTransform);
ticking = true;
}
}
/**
初始化设置
*/
function resetElement() {
el.className = 'animate';
transform = {
translate: { x: START_X, y: START_Y },
scale: 1,
angle: 0,
rx: 0,
ry: 0,
rz: 0
};
requestElementUpdate();
}
resetElement();
</script>
