Animation effect of die throwing game implemented using jQuery_jquery

Implementation principle: After the die is thrown, the displacement of the die is changed through jQuery's animate() function, a delay effect is added in the middle, and the background of the die is changed. Finally, the animation stops when the randomly generated points are reached and displayed. The number of points rolled. In fact, the animation process is to add multiple frames of different pictures (the same as the frames in flash animation videos). The more frames, the better the effect. Then the animation effect is formed after running frame by frame.
1. Preparation
We need to prepare dice material. In this example, I use the dice material obtained from the Internet. What we need to do is to process 6 dice The pictures (1-6 points) and the pictures with intermediate transition effects (motion blur processing) are placed on the same picture, saved as dice.png, and used as the dice background image.
Load the jQuery library, this is necessary.

Copy code The code is as follows:

Then add the following code to the body of the HTML page, where #dice is used to place dice, and #result is used to display prompt information.

Copy code The code is as follows:

Please click the dice above directly!

2. CSS code
We use background to load the image dice.png into .dice. Then we used several styles to position different dice point figures and transition effects pictures through different background-position values. I did a simple blurring process on the transition effect image. You can also use CSS3 to process the blurring effect of the image. Note that #dice_mask is used to prevent repeated clicks, which will be mentioned later.

Copy code The code is as follows:

.wrap{width:90px; height:90px; margin:120px auto 30px auto; position:relative}
.dice{width:90px; height:90px; background:url(dice.png) no-repeat;}
.dice_1{background-position:-5px -4px}
.dice_2{background-position:-5px -107px}
.dice_3{background-position:-5px -212px}
.dice_4{background-position:-5px -317px}
.dice_5{ background-position:-5px -427px}
.dice_6{background-position:-5px -535px}
.dice_t{background-position:-5px -651px}
.dice_s{background-position:- 5px -763px}
.dice_e{background-position:-5px -876px}
p#result{text-align:center; font-size:16px}
p#result span{font-weight: bold; color:#f30; margin:6px}
#dice_mask{width:90px; height:90px; background:#fff; opacity:0; position:absolute;
top:0; left:0; z -index:999}

3. jQuery code
When clicking the dice, first preset the style of the dice (clear the style after the last animation), change the color Use a transparent #dice_mask to cover the dice to prevent repeated clicks, and generate a random number from 1 to 6. Then use the animate() function to change the displacement of the dice and change the class of the dice to make a transitional blurred background image appear, followed by a slight delay. delay(), and then enter the next frame animation. At the end of the animation, the class style of the dice is positioned on dice_x. Keep clicking to roll the dice.

Copy code The code is as follows:

$(function(){
    var dice = $("#dice");
    dice.click(function(){
        dice.attr("class","dice");//清除上次动画后的点数
        dice.css("cursor","default");
        $(".wrap").append("

");//加遮罩
        var num = Math.floor(Math.random()*6 1);//产生随机数1-6
        dice.animate({left: ' 2px'}, 100,function(){
            dice.addClass("dice_t");
        }).delay(200).animate({top:'-2px'},100,function(){
            dice.removeClass("dice_t").addClass("dice_s");
        }).delay(200).animate({opacity: 'show'},600,function(){
            dice.removeClass("dice_s").addClass("dice_e");
        }).delay(100).animate({left:'-2px',top:'2px'},100,function(){
            dice.removeClass("dice_e").addClass("dice_" num);
            $("#result").html("您掷得点数是" num "");
            dice.css('cursor','pointer');
            $("#dice_mask").remove();//移除遮罩
        });
    });
});

关于防止重复点击的办法很多，jQuery提供了one()，live()，bind()，on()等等这些函数在该实例中都行不通，所以我想了个办法，当点击色子后开始动画时，用一个和色子大小一样的透明遮罩层将色子遮住，使得在动画运行中不可连续重复点击色子，当动画运行完成后，再将遮罩层移除，这样色子就可以重新被点击了。
以上掷色子的动画效果就是模拟了flash的帧动画，通过时间轴来播放逐帧运行，而运用jQuery可以代替flash完成这样的动画效果，虽然效果没有flash的炫。本文的掷色子动画效果是为下期文章做铺垫，下期文章我将给大家介绍结合jQuery、HTML、CSS、PHP、MySQL的综合性技术文章及实例代码，讲解掷色子抽奖游戏，可以控制掷出色子点数的概率，也是一个趣味游戏。

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