选择第一帧添加如下代码。
//Height of each blade of grass
grassheight=35;
//Average space in between each blade of grass
grassspacing=5;
//Maximum sway of each blade of grass
maxsway=20;
//Number of blades of grass along the x axis
xplots=30;
//Number of blades of grass along the y axis
yplots=20;
//The wind has an x position and the grass is attracted to the position
windxpos=0;
//Velocity of the wind left and right
windspeed=0;
//Gives the grass a bent effect. The grass bends 1/4 of the way up
grasscontrol=grassheight/4;
//Array containing the info for each blade of grass
grasscoords=[];
//These loops go through the field, planting each blade of grass
for (xpos=0; xpos<xplots; xpos++) {
for (ypos=0; ypos<yplots; ypos++) {
//x position, y position, sway, and color
grasscoords.push([xpos*grassspacing+Math.random()*grassspacing,ypos*grassspacing+Math.random()*grassspacing,0,Math.round(Math.random()*128)*65536+Math.round(Math.random()*76+146)*256]);
}
}
//Run on each frame
onEnterFrame=function(){
//Clear all of the grass so it can be redrawn with different sway
this.clear();
//Change the speed of the wind
windspeed=Math.max(-50,Math.min(50,windspeed+Math.random()*40-20));
//Move the position the blades are attracted according to the windxpos
windxpos+=windspeed;
//If the windxpos moves too far to the left, reverse its speed
if(windxpos<-100){
windxpos=-100;
windspeed*=-1;
}
//If the windxpos moves too far to the right, reverse its speed
else if(windxpos>grassspacing*xplots+100){
windxpos=grassspacing*xplots+100;
windspeed*=-1;
}
//handle the redraw for each blade of grass
for(coord=0;coord<grasscoords.length;coord++){
//Set the line style. 0 means use hairline width and grasscoords[coord][3] is the color
this.lineStyle(0, grasscoords[coord][3], 100, false, "normal", "none", "none", 1);
//Adjust the sway according to the grass's current sway and the windxpos
grasscoords[coord][2]=Math.max(-maxsway,Math.min(maxsway,grasscoords[coord][2]+Math.max(-maxsway,Math.min(maxsway,(windxpos-grasscoords[coord][0])/100))))+(Math.random()*3-1.5);
//Move to the base of the blade of grass
this.moveTo(grasscoords[coord][0],grasscoords[coord][1]);
//Draw a curved line to the new top of the blade of grass
this.curveTo(grasscoords[coord][0],grasscoords[coord][1]-grasscontrol,grasscoords[coord][0]+grasscoords[coord][2],grasscoords[coord][1]-grassheight+Math.abs(grasscoords[coord][2]/2));
}
}
然后回到主场景中，建立两个图层，下面的为云的图层，上面的为草的图层，这里我绘制了一个放草的框框。
按Ctrl+L打开库分别把草元件和云元件放到相应的图层。给草命名实例grass。
最后可以测试影片了！但是好象机器运行速度在减慢啊！祝你好运！
