如何在 Snap svg 中使用 Mina？

Question

这是一个使用 Snap svg 的动画代码：

var s = Snap(3000,3000);

var circle7 = s.circle(130,90,5);
var circle8 = s.circle(155,90,5);
var circle9 = s.circle(180,90,5);
var circle10 = s.circle(205,90,5);
var circle11 = s.circle(230,90,5);
var circle12 = s.circle(255,90,5);


circle.attr({fill:"#ffffff",opacity:0});
circle1.attr({fill:"#ffffff",opacity:0});
circle2.attr({fill:"#ffffff",opacity:0});
circle3.attr({fill:"#ffffff",opacity:0});
circle4.attr({fill:"#ffffff",opacity:0});
circle5.attr({fill:"#ffffff",opacity:0});
circle6.attr({fill:"#ffffff",opacity:0});
circle7.attr({fill:"#ffffff",opacity:0});
circle8.attr({fill:"#ffffff",opacity:0});
circle9.attr({fill:"#ffffff",opacity:0});
circle10.attr({fill:"#ffffff",opacity:0});
circle11.attr({fill:"#ffffff",opacity:0});
circle12.attr({fill:"#ffffff",opacity:0});

circle.animate({fill:"#0000FF",opacity:1},4500);
circle1.animate({fill:"#0000FF",opacity:1},4000);
circle2.animate({fill:"#0000FF",opacity:1},3500);
circle3.animate({fill:"#0000FF",opacity:1},3000);
circle4.animate({fill:"#0000FF",opacity:1},2500);
circle5.animate({fill:"#0000FF",opacity:1},2000);
circle6.animate({fill:"#0000FF",opacity:1},1500);

circle7.animate({fill:"#0000FF",opacity:1},4500);
circle8.animate({fill:"#0000FF",opacity:1},5000);
circle9.animate({fill:"#0000FF",opacity:1},5500);
circle10.animate({fill:"#0000FF",opacity:1},6000);
circle11.animate({fill:"#0000FF",opacity:1},6500);
circle12.animate({fill:"#0000FF",opacity:1},7000);

var cloud = s.image("D:/DigiMKey/login page_files/cloud.png", 0 , 260, 180, 
125);
cloud.attr({opacity:0,width:100,height:65});
cloud.animate({opacity:1,width:200,height:125},1000)

var school =s.image("D:/DigiMKey/images/School-Icon.png", 265, 50, 100,100);
school.attr({opacity:0,width:80,height:80});
school.animate({opacity:1,width:100,height:100},2000)  

我想使用 Mina 为这些对象设置动画，以便它们可以一个接一个地执行。
对象应该一个一个地淡入。
该怎么做？

这段代码没有给出任何错误，但是它们都是同时出现的，而不是一个接一个。

Answer 1

animate函数中有一个回调，用它来调用下一个动画。

var 
s = Snap(300,300),
circle7 = s.circle(130,90,5).attr({fill:"#fff",opacity:0}),
circle8 = s.circle(155,90,5).attr({fill:"#fff",opacity:0}),
circle9 = s.circle(180,90,5).attr({fill:"#fff",opacity:0}),
circle10 = s.circle(205,90,5).attr({fill:"#fff",opacity:0}),
circle11 = s.circle(230,90,5).attr({fill:"#fff",opacity:0}),
circle12 = s.circle(255,90,5).attr({fill:"#fff",opacity:0}),
duration = 500,
props = {fill:"#00f",opacity:1};

/*
var anim = function() {  circle.animate({fill:"#00f",opacity:1}, duration,mina.linear,anim1);}
var anim1 = function() { circle1.animate({fill:"#00f",opacity:1},duration,mina.linear,anim2);}
var anim2 = function() { circle2.animate({fill:"#00f",opacity:1},duration,mina.linear,anim3);}
var anim3 = function() { circle3.animate({fill:"#00f",opacity:1},duration,mina.linear,anim4);}
var anim4 = function() { circle4.animate({fill:"#00f",opacity:1},duration,mina.linear,anim5);}
var anim5 = function() { circle5.animate({fill:"#00f",opacity:1},duration,mina.linear,anim6);}
var anim6 = function() { circle6.animate({fill:"#00f",opacity:1},duration,mina.linear,anim7);}
*/

var anim7 = function() { circle7.animate(props,duration,mina.linear,anim8);}
var anim8 = function() { circle8.animate(props,duration,mina.linear,anim9);}
var anim9 = function() { circle9.animate(props,duration,mina.linear,anim10);}
var anim10= function() { circle10.animate(props,duration,mina.linear,anim11);}
var anim11= function() { circle11.animate(props,duration,mina.linear,anim12);}
var anim12= function() { circle12.animate(props,duration,mina.linear);};


anim7();

<script src="https://cdnjs.cloudflare.com/ajax/libs/snap.svg/0.4.1/snap.svg-min.js"></script>

Answer 2

没有什么可以让它们按顺序动画。

在序列中制作动画的方法是使用回调，它是 animate() 方法的一部分。所以你可以这样做......

circle1.animate({ fill:"#0000FF" }, 1000, mina.linear, callbackFunc2 );

function callbackFunc2() {
   circle2.animate({ fill:"#0000FF" }, 1000, mina.linear, callbackFunc3 );
}

function callbackFunc3()...

等等。当你有很多东西时，自然会觉得有点笨拙，所以我发现添加一个序列插件来提供帮助很有用。例如here

function nextFrame ( el, frameArray,  whichFrame ) {
    if( whichFrame >= frameArray.length ) { return }
    el.animate( frameArray[ whichFrame ].animation, frameArray[ whichFrame ].dur, nextFrame.bind( null, el, frameArray, whichFrame + 1 ) );

}

我还对其进行了扩展，并建议使用 here（请参阅 jsfiddle），如果您经常使用它，它可能会有用。