你的位置:首页 > 网页设计

[网页设计]AlloyRenderingEngine燃烧的进度条


写在前面

Github: https://github.com/AlloyTeam/AlloyGameEngine

HTML 5新增了progress标签,那么再去使用AlloyRenderingEngine去模拟进度条是否多余?
不多余。有四大好处:

  • 样式更加灵活(想怎么绘制就怎么绘制)
  • 跨平台跨浏览器样式更加统一(使用便签,各个浏览器默认样式是五花八门)
  • 效果更加酷炫,(比如燃烧的进度条= =!)
  • 像素能够统一管理

统一像素管理的好处:

  • 更容易的全尺寸缩小和放大(最常见的:全屏游戏)
  • 缩小和放大不用操心内部元素错位(只是交给浏览器去进行插值运算)
  • 更好的滤镜控制(如游戏中死亡画面,全屏黑白化)
  • 更好的移植性和跨平台性(opengl<->canvas2d<->webgl<->opengl等等各种mapping)

上面所列的,对AlloyRenderingEngine所有组件都适用。

演示


(ps:可以直接点击进度条黑色部分设置进度)

组件使用

; (function () {  //注意:当要渲染文字(Text)和图形(Graphics)时,请使用Cavnas渲染  //Progress组件内部使用了Graphics  //第二个参数true代表关闭webgl,使用Canvas2d渲染  //如果要使用webgl渲染,请使用Lable渲染文字,Shape渲染矢量图。  var stage = new ARE.Stage("#ourCanvas", true);  var progress = new ARE.Progress({    width: 200,    height: 20,    borderColor: "#3d3d3d",    fillColor: "#black"  })  progress.x = 50;  progress.y = 50;  stage.add(progress);  var current = 0, pause = true;  stage.onTick(function () {    if (!pause) {      current += 0.005;      progress.value = current;    }  });  //进度条的over时,鼠标的形状  progress.cursor = "pointer";  progress.onClick(function (evt) {    //注意这里可以使用evt.stageX来得到相对于舞台(Canvas)的偏移    current = progress.value = (evt.stageX - progress.x) / progress.width;  })  var btn = document.querySelector("#progressBegin");  //点击按钮,开始进度条开始运行  btn.addEventListener("click", function () {    pause = false;  }, false);})();

组件原理(看注释)

; (function () {  //先把要使用类的赋给临时变量,以后就不用打点了:)  var Stage = ARE.Stage, Container = ARE.Container, Graphics = ARE.Graphics;  //进度条继承自容器  ARE.Progress = Container.extend({    //构造函数    ctor: function (option) {      //把容器的属性和方法搞给自己      this._super();      this.width = option.width;      this.height = option.height;      this.fillColor = option.fillColor;      this.value = option.value||0;      //外层边框      this.box = new Graphics()          //直接根据传进的宽和高画个矩形      this.box.lineWidth(2).strokeStyle(option.borderColor || "black").strokeRect(0, 0, option.width, option.height);      //把边框添加到自身(因为自身就是容器,继承自Container,所以有了add方法)      this.add(this.box);      var barWidth = this.value * option.width - 4;            this.bar = new Graphics();      //把bar添加到自身(因为自身就是容器,继承自Container,所以有了add方法)      this.add(this.bar);      this.bar.fillStyle(option.fillColor || "green").fillRect(2, 2, barWidth < 0 ? 0 : barWidth, option.height - 4);      //引导的火焰,使用粒子系统去模拟      this.pilot = new ARE.ParticleSystem({        emitX: 0,        emitY:0,        speed:10,        angle: 180,        angleRange: 90,        emitArea: [1, option.height],             texture: "data:image/png;base64\,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",        filter: [0.63, 0.35, 0.18, 1],        emitCount: 1,        maxCount: 50      });      this.pilot.y = option.height / 2;      //设置火焰色缩放,因为ParticleSystem本身也是继承自容器,所以具备scale属性      //等同于this.pilot.scaleX = this.pilot.scaleY = 0.4;      this.pilot.scale = 0.4;      //把引导的火焰添加到自身(因为自身就是容器,继承自Container,所以有了add方法)      this.add(this.pilot);            //监听value的变化,赋值胜于call method      ARE.Observe(this, "value", function (name, value) {               if (value >= 1) {          //通过maxCount限制粒子的个数,达到关闭火焰的效果          this.pilot.maxCount = 0;          this.value = 1;        } else {          this.pilot.maxCount = 50;          this.value = value;        }        //设置火焰的位置        this.pilot.x = this.value * this.width;        var barWidth = this.value * this.width - 4;        this.bar.clear().fillStyle(this.fillColor || "green").fillRect(2, 2, barWidth < 0 ? 0 : barWidth, this.height - 4);             })    }  });})();

最新动态请关注Github: https://github.com/AlloyTeam/AlloyGameEngine