我有一个跟随鼠标光标的图像。
HTML代码为:
JavaScript:
但是没有成功
HTML代码为:
<img id="cow" src="https://icons.iconarchive.com/icons/gakuseisean/ivista-2/128/Alarm-Arrow-Right-icon.png" height="30px" width="30px" style="position: absolute; top: 50%; left: 50%;"/>
JavaScript:
var mouseXY = {};
$( document ).on( "mousemove", function( event ) {
mouseXY.X = event.pageX;
mouseXY.Y = event.pageY;
});
var iCow = $("#cow");
var cowInterval = setInterval(function()
{
var cowXY = iCow.position();
var diffX = cowXY.left - mouseXY.X;
var diffY = cowXY.top - mouseXY.Y;
var newX = cowXY.left - diffX / 1000;
var newY = cowXY.top - diffY / 1000;
iCow.css({left: newX, top: newY});
}, 10);
如何将图像旋转到光标的方向?
我已经尝试使用transform: rotate()
来实现:
var cowInterval = setInterval(function()
{
var cowXY = iCow.position();
var diffX = cowXY.left - mouseXY.X;
var diffY = cowXY.top - mouseXY.Y;
var newX = cowXY.left - diffX / 1000;
var newY = cowXY.top - diffY / 1000;
var tan = diffX / diffY;
var atan = Math.atan(tan);
iCow.css({left: newX, top: newY, transform: "rotate(" +((-1)*atan - Math.PI/2)+ "rad)"});
}, 10);
但是没有成功
position()
上。即使没有移动,位置值也会因为旋转变换而不断改变。你可以看到控制台日志。https://jsfiddle.net/q9kn8ady/4/ - cjmling