[Flash动画制作ActionScript教程]AS3 结合基本的动画和AS3绘图API

分类:Flash动画制作    发布时间:2017年06月12日    点击:1062次

[Flash动画制作ActionScript教程]AS3 结合基本的动画和AS3绘图API


  这是一个粒子效果实例教程,学习如何结合基本的动画和 ActionScript 3 绘图API。

  演示:

  1、新建Flash文件,设置属性:宽、高默认为550*400 ,保存,名称任意。图1:

  

sshot-1.png


  2、用椭圆工具画一个 10 × 10 大小的球,颜色任意。

  3、把球转换成影片剪辑,命名 "Particle ",注册点居中。图2:

  

sshot-2.png


  4、把球从舞台上删除。

  5、打开库面板,右键单击Particle影片剪辑,选择属性。在属性面板中的链接项,为ActionScript导出的复选框打勾。在类的文本输入框中输入" Particle " 。图3:

  

sshot-3.png


  6、新建一个ActionScript文件,命名为 " Particle ",保存在fla文件相同的目录下。图4:

  

sshot-4.png


  在编译器中输入代码:

  复制代码代码如下:

  package{

  importflash.display.MovieClip;

  publicclassParticleextendsMovieClip{

  //Weneeddifferentspeedsfordifferentparticles.

  //Thesevariablescanbeaccessedfromthemainmovie,becausetheyarepublic.

  publicvarspeedX:Number;

  publicvarspeedY:Number;

  functionParticle():void{

  }

  }

  }

  7、切换到fla主类。生成粒子实例,显示在舞台上,而且增加一些效果。在第1帧输入代码:

  复制代码代码如下:

  //Weneedfewimportsforthefilters

  importfl.motion.Color;

  importflash.geom.ColorTransform;

  //Createanarrayfortheparticlesforlateruse

  varnumberOfParticles:Number=30;

  varparticlesArray:Array=newArray();

  //Thisloopcreates30particlesthatarepositionedrandomlyonthestage.

  //Wealsoaddsomeeffectstotheparticles

  for(vari=0;i<numberofparticles;i++){< p="">

  varparticle:Particle=newParticle();

  //Giverandomxandyspeedtotheparticle.

  //Math.randomreturnsarandomnumbern,where0<=n<1.

  particle.speedX=2+Math.random();

  particle.speedY=2+Math.random();

  //Setthestartingposition

  particle.y=Math.random()*stage.stageHeight;

  particle.x=Math.random()*stage.stageWidth;

  //Setarandomtinttotheparticle,sotheywillhavedifferentcolors.

  varct:Color=newColor();

  ct.setTint(0xFFFFFF*Math.random(),0.5);

  particle.transform.colorTransform=ct;

  //Setrandomsizetotheparticles,sotheparticleswilldifferinsize

  particle.scaleX=0.5+Math.random();

  particle.scaleY=particle.scaleX;

  //Thisarrayisusedtostoreallofthefilters

  varparticleFilters:Array=newArray();

  //Createadifferentblureffectineachparticle

  vartempBlurAmount=Math.random()*4;

  varblur:BlurFilter=newBlurFilter(tempBlurAmount,tempBlurAmount,1);

  particleFilters.push(blur);

  //Createagloweffectineachparticle

  varcolor:Number=0x000000;

  varalphaValue:Number=0.5;

  varblurX:Number=20;

  varblurY:Number=20;

  varstrength:Number=5;

  varglow:GlowFilter=newGlowFilter(color,

  alphaValue,

  blurX,

  blurY,

  strength);

  particleFilters.push(glow);

  //Applythecreatedfilterstotheparticle(blur&glow)

  particle.filters=particleFilters;

  //Addtheparticletothestageandpushitintoanarrayforlateruse

  addChild(particle);

  particlesArray.push(particle);

  }

  可能看起来很难的 ,但实际上非常简单。注释应该解释的很充分。测试一下影片剪辑,效果如图。图5:

  

sshot-5.png


  8、注册Event.ENTER_FRAME事件,随机地移动粒子。接上面输入代码:

  复制代码代码如下:

  addEventListener(Event.ENTER_FRAME,enterFrameHandler);

  //Thisfunctionisresponsibleforanimation

  functionenterFrameHandler(e:Event):void{

  //Let’sloopthroughtheparticles

  for(i=0;i<particlesarray.length;i++){< p="">

  varparticleOne:Particle=particlesArray[i];

  //Movetheparticletoanewlocation

  particleOne.x+=particleOne.speedX;

  particleOne.y+=particleOne.speedY;

  //Checktheboundaries.

  //Ifahitoccurs,multiplythespeedby(-1)toreversethespeed.

  //Rightedge

  if(particleOne.x>stage.stageWidth){

  particleOne.x=stage.stageWidth-particleOne.width/2;

  particleOne.speedX*=-1;

  }

  //Leftedge

  elseif(particleOne.x<0){

  particleOne.x=particleOne.width/2;

  particleOne.speedX*=-1;

  }

  //Bottom

  if(particleOne.y>stage.stageHeight){

  particleOne.y=stage.stageHeight-particleOne.width/2;

  particleOne.speedY*=-1;

  }

  //Top

  elseif(particleOne.y<0){

  particleOne.y=particleOne.width/2;

  particleOne.speedY*=-1;

  }

  }

  }

  测试影片剪辑,观看一下效果。未命名-1.swf:

  9、为粒子加入连线,修改 enterFrameHandler,代码如下:

  复制代码代码如下:

  functionenterFrameHandler(e:Event):void{

  //Clearthepreviouslines

  graphics.clear();

  //Let’sloopthroughtheparticles

  for(i=0;i<particlesarray.length;i++){< p="">

  varparticleOne:Particle=particlesArray[i];

  //Movetheparticletoanewlocation

  particleOne.x+=particleOne.speedX;

  particleOne.y+=particleOne.speedY;

  //Checktheboundaries

  if(particleOne.x>stage.stageWidth){

  particleOne.x=stage.stageWidth-particleOne.width/2;

  particleOne.speedX*=-1;

  }

  elseif(particleOne.x<0){

  particleOne.x=particleOne.width/2;

  particleOne.speedX*=-1;

  }

  if(particleOne.y>stage.stageHeight){

  particleOne.y=stage.stageHeight-particleOne.width/2;

  particleOne.speedY*=-1;

  }

  elseif(particleOne.y<0){

  particleOne.y=particleOne.width/2;

  particleOne.speedY*=-1;

  }

  //Gothroughtheotherparticlestocheckthedistancewiththefirstparticle

  for(varj:uint=i+1;j<particlesarray.length;j++){< p="">

  varparticleTwo:Particle=particlesArray[j];

  vardistanceX:Number=particleOne.x-particleTwo.x;

  vardistanceY:Number=particleOne.y-particleTwo.y;

  //UsePythagoreantheorem(a^2+b^2=c^2)tocalculatethedistance

  vardistance:Number=Math.sqrt(distanceX*distanceX+distanceY*distanceY);

  //Ifthedistanceissmallerthan80px,drawalinebetweentheparticles

  if(distance<80){

  drawLine(particleOne,particleTwo);

  }

  }

  }

  }

  在enterFrameHandler之后添加方法drawLine实现画线功能。

  //Thisfunctiondrawsablacklinebetweentwoparticles

  functiondrawLine(particleOne:Particle,particleTwo:Particle):void{

  graphics.lineStyle(1,0x000000);//线为白色,如黑色背景改为0xffffff

  graphics.moveTo(particleOne.x,particleOne.y);

  graphics.lineTo(particleTwo.x,particleTwo.y);

  } 10、测试影片剪辑。

  完整主类代码:

  //Weneedfewimportsforthefilters

  importfl.motion.Color;

  importflash.geom.ColorTransform;

  //Createanarrayfortheparticlesforlateruse

  varnumberOfParticles:Number=30;

  varparticlesArray:Array=newArray();

  //Thisloopcreates30particlesthatarepositionedrandomlyonthestage.

  //Wealsoaddsomeeffectstotheparticles

  for(vari=0;i<numberofparticles;i++){< p="">

  varparticle:Particle=newParticle();

  //Giverandomxandyspeedtotheparticle.

  //Math.randomreturnsarandomnumbern,where0<=n<1.

  particle.speedX=2+Math.random();

  particle.speedY=2+Math.random();

  //Setthestartingposition

  particle.y=Math.random()*stage.stageHeight;

  particle.x=Math.random()*stage.stageWidth;

  //Setarandomtinttotheparticle,sotheywillhavedifferentcolors.

  varct:Color=newColor();

  ct.setTint(0xFFFFFF*Math.random(),0.5);

  particle.transform.colorTransform=ct;

  //Setrandomsizetotheparticles,sotheparticleswilldifferinsize

  particle.scaleX=0.5+Math.random();

  particle.scaleY=particle.scaleX;

  //Thisarrayisusedtostoreallofthefilters

  varparticleFilters:Array=newArray();

  //Createadifferentblureffectineachparticle

  vartempBlurAmount=Math.random()*4;

  varblur:BlurFilter=newBlurFilter(tempBlurAmount,tempBlurAmount,1);

  particleFilters.push(blur);

  //Createagloweffectineachparticle

  varcolor:Number=0x000000;

  varalphaValue:Number=0.5;

  varblurX:Number=20;

  varblurY:Number=20;

  varstrength:Number=5;

  varglow:GlowFilter=newGlowFilter(color,

  alphaValue,

  blurX,

  blurY,

  strength);

  particleFilters.push(glow);

  //Applythecreatedfilterstotheparticle(blur&glow)

  particle.filters=particleFilters;

  //Addtheparticletothestageandpushitintoanarrayforlateruse

  addChild(particle);

  particlesArray.push(particle);

  }

  addEventListener(Event.ENTER_FRAME,enterFrameHandler);

  //Thisfunctionisresponsibleforanimation

  functionenterFrameHandler(e:Event):void{

  //Clearthepreviouslines

  graphics.clear();

  //Let’sloopthroughtheparticles

  for(i=0;i<particlesarray.length;i++){< p="">

  varparticleOne:Particle=particlesArray[i];

  //Movetheparticletoanewlocation

  particleOne.x+=particleOne.speedX;

  particleOne.y+=particleOne.speedY;

  //Checktheboundaries

  if(particleOne.x>stage.stageWidth){

  particleOne.x=stage.stageWidth-particleOne.width/2;

  particleOne.speedX*=-1;

  }

  elseif(particleOne.x<0){

  particleOne.x=particleOne.width/2;

  particleOne.speedX*=-1;

  }

  if(particleOne.y>stage.stageHeight){

  particleOne.y=stage.stageHeight-particleOne.width/2;

  particleOne.speedY*=-1;

  }

  elseif(particleOne.y<0){

  particleOne.y=particleOne.width/2;

  particleOne.speedY*=-1;

  }

  //Gothroughtheotherparticlestocheckthedistancewiththefirstparticle

  for(varj:uint=i+1;j<particlesarray.length;j++){< p="">

  varparticleTwo:Particle=particlesArray[j];

  vardistanceX:Number=particleOne.x-particleTwo.x;

  vardistanceY:Number=particleOne.y-particleTwo.y;

  //UsePythagoreantheorem(a^2+b^2=c^2)tocalculatethedistance

  vardistance:Number=Math.sqrt(distanceX*distanceX+distanceY*distanceY);

  //Ifthedistanceissmallerthan80px,drawalinebetweentheparticles

  if(distance<80){

  drawLine(particleOne,particleTwo);

  }

  }

  }

  }

  //Thisfunctiondrawsablacklinebetweentwoparticles

  functiondrawLine(particleOne:Particle,particleTwo:Particle):void{

  graphics.lineStyle(1,0x000000);

  graphics.moveTo(particleOne.x,particleOne.y);

  graphics.lineTo(particleTwo.x,particleTwo.y);

  }


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