教你用FLASH做漂亮的飞鸟效果动画
类别: Flash教程 
效果演示：
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1．新建一个Flash文档，单击“属性”面板中的“尺寸”按钮，打开“文档属性”面板设置场景大小为350px x 300px，帧频为20fps。
2．按快捷键Ctrl+F8新建一个名为“图片”的影片剪辑元件。按快捷键Ctrl+R打开“导入”面板导入一幅可以覆盖场景的山水图片。
3．按快捷键Ctrl+L打开“库”面板，把“图片”元件拖拽到“场景1”中。点选场景中的“图片”元件，按快捷键Ctrl+K打开“对齐”面板，点击“相对于舞台”按钮，再点击“左对齐”和“上对齐”按钮。这样很容易就使“图片”元件覆盖住整个场景了。
4．创建一个“飞鸟”影片剪辑元件。该元件的图层设置“左翅”层和“右翅”层利用“形状渐变”运动让两条线段可以模拟鸟翅膀煽动的运动。打开“洋葱皮”命令可以很清楚的看到了.在各帧中，线段只是角度不一样，以产生运动的效果。设置线段角度的变化可以按快捷键Ctrl+T打开“变形”面板进行辅助设置。
5．按快捷键Ctrl+L打开“库”面板。右键点击“库”中的“飞鸟”元件，单击“链接”命令打开“链接属性”面板，(点选为动作脚本导出、在第一帧导出)。使用“链接属性”面板定义影片剪辑元件后，可以直接利用代码调用元件，而不必把元件拖拽到场景中。
6．回到“场景1”，点选“图层 1”的第1帧，按F9键打开“动作”面板，输入如下代码：
// 飞鸟动画
damp = .95;
numbirds = 30;
for (i=0; i<numbirds; i++) {
bird = attachMovie("bird", "bird"+i, i);
bird._x = Math.random()*350+20;
bird._y = Math.random()*300+20;
bird.vx = Math.random()*10-5;
bird.vy = Math.random()*10-5;
bird.k = Math.random()*.0001+.0003;
bird.gotoAndPlay(Math.round(Math.random()*20));
}
onEnterFrame = function () {
var totx = 0;
var toty = 0;
for (i=0; i<numbirds; i++) {
bird = _root["bird"+i];
totx += bird._x;
toty += bird._y;
}
avgx = totx/numbirds;
avgy = toty/numbirds;
for (i=0; i<numbirds; i++) {
bird = _root["bird"+i];
bird.vx += (avgx-bird._x)*bird.k;
bird.vy += (avgy-bird._y)*bird.k;
bird.vx += Math.random()-.5;
bird.vy += Math.random()-.5;
bird.vx *= damp;
bird.vy *= damp;
targAngle = Math.atan2(bird.vy, bird.vx)*180/Math.PI;
diff = targAngle-bird._rotation;
if (diff<-180) {
diff += 360;
}
if (diff>180) {
diff -= 360;
}
bird._rotation += diff*.2;
bird._x += bird.vx;
bird._y += bird.vy;
}
}
damp = .95;
numbirds = 30;
for (i=0; i<numbirds; i++) {
bird = attachMovie("bird", "bird"+i, i);
bird._x = Math.random()*350+20;
bird._y = Math.random()*300+20;
bird.vx = Math.random()*10-5;
bird.vy = Math.random()*10-5;
bird.k = Math.random()*.0001+.0003;
bird.gotoAndPlay(Math.round(Math.random()*20));
}
onEnterFrame = function () {
var totx = 0;
var toty = 0;
for (i=0; i<numbirds; i++) {
bird = _root["bird"+i];
totx += bird._x;
toty += bird._y;
}
avgx = totx/numbirds;
avgy = toty/numbirds;
for (i=0; i<numbirds; i++) {
bird = _root["bird"+i];
bird.vx += (avgx-bird._x)*bird.k;
bird.vy += (avgy-bird._y)*bird.k;
bird.vx += Math.random()-.5;
bird.vy += Math.random()-.5;
bird.vx *= damp;
bird.vy *= damp;
targAngle = Math.atan2(bird.vy, bird.vx)*180/Math.PI;
diff = targAngle-bird._rotation;
if (diff<-180) {
diff += 360;
}
if (diff>180) {
diff -= 360;
}
bird._rotation += diff*.2;
bird._x += bird.vx;
bird._y += bird.vy;
}
}
7．为了使该动画更有趣些，我们在以上的代码下，再添加如下代码：
// 鼠标动作
function drawToPoint(){
for(i=0;i<numbirds;i++){
bird=_root["bird"+i];
bird.vx+=(_xmouse-bird._x)*bird.k*100;
bird.vy+=(_ymouse-bird._y)*bird.k*100;
}
}
onMouseDown = drawToPoint;
function drawToPoint(){
for(i=0;i<numbirds;i++){
bird=_root["bird"+i];
bird.vx+=(_xmouse-bird._x)*bird.k*100;
bird.vy+=(_ymouse-bird._y)*bird.k*100;
}
}
onMouseDown = drawToPoint;
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