AS3动画效果公式,常用处理公式代码,基本运动公式,三角公式

as3种常见的弹性效果公式以及波形运动等as3动画效果公式代码整理，对于常用的来说作者整理的很全面，包括AS3的进制转换颜色提取等效果：

AS3缓动公式:

sprite.x += (targetX – sprite.x) * easing;//easing为缓动系数变量sprite.y += (targetY – sprite.y) * easing;

AS3弹性公式:

vx += (targetX – sprite.x) * spring;//spring为弹性系数vy += (targetY – sprite.y) * spring;sprite.x += (vx *= friction);//friction为摩擦力sprite.y += (vy *= friction);

AS3偏移弹性公式:

var dx:Number = sprite.x – fixedX;var dy:Number = sprite.y – fixedY;var angle:Number = Math.atan2(dy, dx);var targetX:Number = fixedX + Math.cos(angle) * springLength;var targetY:Number = fixedX + Math.sin(angle) * springLength;

AS3向鼠标旋转(或向某点旋转)

dx = mouseX – sprite.x;dy = mouseY – sprite.y;sprite.rotation = Math.atan2(dy, dx) * 180 / Math.PI;

AS3波形运动:

public function onEnterFrame1(event:Event):void {ball.y=centerScale+Math.sin(angle)*range;angle+=speed;}

心跳:

public function onEnterFrame1(event:Event):void {ball.scaleX=centerScale+Math.sin(angle)*range;ball.scaleY=centerScale+Math.sin(angle)*range;angle+=speed;}

AS3圆心旋转:

public function onEnterFrame(event:Event):void {ball.x=centerX+Math.cos(angle)*radius;ball.y=centerY+Math.sin(angle)*radius;angle+=speed;}

椭圆旋转:

public function onEnterFrame(event:Event):void {ball.x=centerX+Math.cos(angle)*radiusX;ball.y=centerY+Math.sin(angle)*radiusY;angle+=speed;}

AS3颜色运算得到透明值:

var t:uint=0×77ff8877var s:uint=0xff000000var h:uint=t&svar m:uint=h>>>24trace(m)

AS3转换为十进制:
trace(hexValue);

AS3十进制转换为十六进制:

decimalValue.toString(16)

AS3颜色提取:

red = color24 >> 16;green = color24 >> 8 & 0xFF;blue = color24 & 0xFF;alpha = color32 >> 24;red = color32 >> 16 & 0xFF;green = color32 >> 8 & 0xFF;blue = color232 & 0xFF;

AS3按位计算得到颜色值:

color24 = red < < 16 | green << 8 | blue;color32 = alpha << 24 | red << 16 | green << 8 | blue;

AS3过控制点的曲线:

// xt, yt is the point you want to draw through// x0, y0 and x2, y2 are the end points of the curvex1 = xt * 2 – (x0 + x2) / 2;y1 = yt * 2 – (y0 + y2) / 2;moveTo(x0, y0);curveTo(x1, y1, x2, y2);

AS3右键菜单:
建立右键菜单项：

var cm:ContextMenu=new ContextMenu();cm.hideBuiltInItems();//隐藏系统菜单（不全隐藏）cm.builtInItems指向右键菜单的系统项是个ContextMenuBuiltInItems对象如： cm.builtInItems.print=true;使其打印可选cm.customItems是个数字指定右键菜单项目new ContextMenuItem(“菜单1″,false,true,true)建立一个右键菜单项目,必须指定到customItem中，第一个参数为是否上面出现间隔线，第二个为是否禁用，第三个为是否显示；如： cm.customItems.push(new ContextMenuItem(“hello”,false,false,true))

常用事件：

cm.addEventListener(ContextMenuEvent.MENU_SELECT,function(){trace(“ss”)})//当右键菜单触发时cm.customItems[i].addEventListener(ContextMenuEvent.MENU_ITEM_SELECT,MenuItemSelectHandler);//当某个选择项触发时e.currentTarget.caption;得到相应的caption

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缓动和弹性

简单缓动：

// 长形var dx:Number = targetX - sprite.x;var dy:Number = targetY - sprite.y;vx = dx * easing;vy = dy * easing;sprite.x += vx;sprite.y += vy;// 中形vx = (targetX - sprite.x) * easing;vy = (targetY - sprite.y) * easing;sprite.x += vx;sprite.y += vy;// 短形sprite.x += (targetX - sprite.x) * easing;sprite.y += (targetY - sprite.y) * easing;

简单弹性：

var ax:Number = (targetX - sprite.x) * spring;var ay:Number = (targetY - sprite.y) * spring;vx += ax;vy += ay;vx *= friction;vy *= friction;sprite.x += vx;sprite.y += vy;// 简化vx += (targetX - sprite.x) * spring;vy += (targetY - sprite.y) * spring;sprite.x += (vx *= friction);sprite.y += (vy *= friction);

偏移弹性运动：

var dx:Number = sprite.x - fixedX;var dy:Number = sprite.y - fixedY;var angle:Number = Math.atan2(dy,dx);var targetX:Number = fixedX + Math.cos(angle) * springLength;var targetY:Number = fixedY + Math.sin(angle) * springLength;

碰撞检测

距离碰撞检测：

//从spriteA 和 spriteB开始，如果使用一个空白影片，或影片没有半径（radius）属性//可以用高度与宽度除以2var dx:Number = spriteB.x - spriteA.x;var dy:Number = spriteB.y - spriteA.y;var dist:Number = Math.sqrt(dx*dx + dy*dy);if (dist < spriteA.randius + spriteB.radius) {//处理碰撞}

多物体碰撞检测：

var numObjects:uint = 10;for (var i :uint = 0; i < numObjects -1; i++) {var objectA = object[i ];for (var j :uint = 0; i < numObjects; j++) {var objectB = object[j ];// 在 objectA 与 objectB 之间进行碰撞检测}}

坐标旋转和角度回弹

坐标旋转：

x1 = Math.cos(angle) * x - Math.sin(angle) * y;y1 = Math.sin(angle) * y + Math.cos(angle) * x;

反坐标旋转：

x1 = Math.cos(angle) * y + Math.sin(angle) * y;y1 = Math.cos(angle) * y - Math.sin(angle) * y;

撞球物理

动量：p = m * v
动量守恒：（m0 * v0) + (m1 * v1) = (m0 * v0Final) + (m1 * v1Final)
动能：KE = 0.5 * m * v²
动能守恒：(0. 5 * m0 * v0²) + (0.5 * m1 * v1²) = (0.5 * m0 * v0Final²) + (0.5 * m1 * v1Final²)

动量守恒的数学表达式：

v0Final = ((m0 - m1) * v0 + 2 * m1 * v1 ) / (m0 + m1)v1Final = ((m1 - m0) * v1 + 2 * m0 * v0 ) / (m0 + m1)

动量守恒的ActionScript表达式：

var vxTotal:Number = vx0 - vx1;vx0 = ((ball0.mass - ball1.mass) * vx0 + 2 * ball1.mass * vx1 ) / (ball0.mass + ball1.mass);vx1 = vxTotal + vx0;

粒子(Particles)引力和重力

引力的一般公式：

force = G * m1 * m2 / distance²
ActionScript 实现万有引力：function gravitate ( partA:Ball, partB:Ball): void{var dx:Number = partB.x - partA.x;var dy:Number = partB.y - partA.y;var distSQ:Number = dx * dx + dy * dy;var dist:Number = Math.sqrt(distSQ );var force:Number = partA.mass * partB.mass / distSQ;var ax:Number = force * dx / dist;var ay:Number = force * dy / dist;partA.vx += ax / partA.mass;partA.vy += ay / partA.mass;partB.vx -= ax / partB.mass;partB.vy -= ay / partB.mass;}

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速度与加速度

角速度转换为x,y速度向量：

vx = speed * Math.cos(angle);vy = speed * Math.sin(angle);

角加速度（作用于物体上的force）转换为x,y加速度：

ax = force * Math.cos(angle);ay = force * Math.sin(angle);

将加速度加入速度向量：

vx += ax;vy += ay;

将速度向量加入坐标：

sprite.x += vx;sprite.y += vy;

边界与摩擦力

处理出界对象：

if ( sprite.x - sprite.width / 2 > right ||sprite.x +sprite.width / 2 < left ||sprite.y - sprite.height / 2 > bottom ||sprite.y + sprite.height / 2 < top ){// 移除对象代码（或 重置对象代码）}

屏幕环绕出界对象：

if ( sprite.x - sprite.width / 2 > right ) {sprite.x = left – sprite.width / 2;} else if ( sprite.x + sprite.width / 2 < left ) {sprite.x = right + sprite.width / 2;}if ( sprite.y - sprite.height / 2 > bottom ) {sprite.y = top – sprite.height / 2;}else if ( sprite.y + sprite.height / 2 < top ) {sprite.y = sprite.y + sprite.height / 2;}

摩擦力应用（正确方法）：

speed = Math.sqrt ( vx*vx + vy*vy );angle = Math.atan2 ( vy,vx );if ( speed > friction ) {speed -= friction;} else {speed = 0;}vx = Math.cos(angle) * speed;vy = Math.sin(angle) * speed;

摩擦力应用（简便方法）：

vx *= friction;vy *= friction;

———————————————————–
缓动公式:

sprite.x += (targetX – sprite.x) * easing;//easing为缓动系数变量
sprite.y += (targetY – sprite.y) * easing;

弹性公式:

vx += (targetX – sprite.x) * spring;//spring为弹性系数
vy += (targetY – sprite.y) * spring;
sprite.x += (vx *= friction);//friction为摩擦力
sprite.y += (vy *= friction); 偏移弹性公式:
var dx:Number = sprite.x – fixedX;
var dy:Number = sprite.y – fixedY;
var angle:Number = Math.atan2(dy, dx);
var targetX:Number = fixedX + Math.cos(angle) * springLength;
var targetY:Number = fixedX + Math.sin(angle) * springLength;
向鼠标旋转(或向某点旋转)
dx = mouseX – sprite.x; dy = mouseY – sprite.y;
sprite.rotation = Math.atan2(dy, dx) * 180 / Math.PI;

波形运动:

public function onEnterFrame1(event:Event):void {
ball.y=centerScale+Math.sin(angle)*range;
angle+=speed;
}

心跳:

public function onEnterFrame1(event:Event):void {
ball.scaleX=centerScale+Math.sin(angle)*range;
ball.scaleY=centerScale+Math.sin(angle)*range;
angle+=speed;
}

圆心旋转:

public function onEnterFrame(event:Event):void {
ball.x=centerX+Math.cos(angle)*radius;
ball.y=centerY+Math.sin(angle)*radius;
angle+=speed;
}

椭圆旋转:

public function onEnterFrame(event:Event):void {
ball.x=centerX+Math.cos(angle)*radiusX;
ball.y=centerY+Math.sin(angle)*radiusY;
angle+=speed;
}

按位计算得到颜色值:

color24 = red << 16 | green << 8 | blue;
color32 = alpha << 24 | red << 16 | green << 8 | blue;

过控制点的曲线:

// xt, yt is the point you want to draw through // x0, y0 and x2, y2 are the end points of the curve x1 = xt * 2 – (x0 + x2) / 2; y1 = yt * 2 – (y0 + y2) / 2; moveTo(x0, y0); curveTo(x1, y1, x2, y2);
向鼠标旋转(或向某点旋转)dx = mouseX – sprite.x;dy = mouseY – sprite.y;sprite.rotation = Math.atan2(dy, dx) * 180 / Math.PI;

波形运动：

public function onEnterFrame1(event:Event):void {ball.y=centerScale+Math.sin(angle)*range;angle+=speed;}

心跳：

public function onEnterFrame1(event:Event):void {ball.scaleX=centerScale+Math.sin(angle)*range;ball.scaleY=centerScale+Math.sin(angle)*range;angle+=speed;}

圆心旋转

public function onEnterFrame(event:Event):void {ball.x=centerX+Math.cos(angle)*radius;ball.y=centerY+Math.sin(angle)*radius;angle+=speed;}

椭圆旋转

public function onEnterFrame(event:Event):void {ball.x=centerX+Math.cos(angle)*radiusX;ball.y=centerY+Math.sin(angle)*radiusY;angle+=speed;}

勾股定理

两个点坐标分别为x1,y1和x2,y2，那么两点间距离为var dx:Number = sprite1.x – sprite2.x;var dy:Number = sprite1.y – sprite2.y;var dist:Number = Math.sqrt(dx * dx + dy * dy);注：Math.sqrt是开平方的意思

画布中随机坐标

sprite1.x = Math.random() * stage.stageWidth;sprite1.y = Math.random() * stage.stageHeight;

鼠标到Sprite之间连线

public function onMouseMove(event:MouseEvent):void {graphics.clear();graphics.lineStyle(1, 0, 1);graphics.moveTo(sprite1.x, sprite1.y);graphics.lineTo(mouseX, mouseY);var dx:Number=sprite1.x-mouseX;var dy:Number=sprite1.y-mouseY;var dist:Number=int(Math.sqrt(dx*dx+dy*dy));textField.text=dist.toString();}

基本三角函数的计算：
角的正弦值 = 对边 / 斜边
角的余弦值 = 邻边 / 斜边
角的正切值 = 对边 / 邻边

角度制与弧度制的相互转换：
弧度 = 角度 * Math.PI / 180
角度 = 弧度 * 180 / Math.PI

计算两点间距离

dx = x2 – x1;dy = y2 – y1;dist = Math.sqrt(dx*dx + dy*dy);

偏移弹性公式:

var dx:Number = sprite.x - fixedX;var dy:Number = sprite.y - fixedY;var angle:Number = Math.atan2(dy, dx);var targetX:Number = fixedX + Math.cos(angle) * springLength;var targetY:Number = fixedX + Math.sin(angle) * springLength;

过控制点的曲线:

// xt, yt是你想要让曲线通过的那一点// x0, y0 和x2, y2 是曲线的终点//PS.发现很多人转帖都是直接复制粘贴，也不翻译一下xt * 2 – (x0 + x2) / 2;y1 = yt * 2 – (y0 + y2) / 2;moveTo(x0, y0);curveTo(x1, y1, x2, y2);

// 重置影片的位置和速度

if(sprite.x - sprite.width / 2 > right ||  sprite.x + sprite.width / 2 < left ||  sprite.y – sprite.height / 2 > bottom ||  sprite.y + sprite.height / 2 < top){  }

摩擦力应用(正确方法)：

DE>speed = Math.sqrt(vx * vx + vy * vy); DE>DE>angle = Math.atan2(vy, vx); DE>DE>ifDE>DE>(speed > friction){ DE>DE>speed -= friction; DE>DE>}DE>DE>elseDE>DE>{ DE>DE>speed = 0; DE>DE>} DE>DE>vx = Math.cos(angle) * speed; DE>DE>vy = Math.sin(angle) * speed;DE>

摩擦力应用(简便方法)：

DE>vx *= friction; DE>
DE>vy *= friction;
坐标旋转：

 x1 = Math.cos(angle) * x - Math.sin(angle) * y;  y1 = Math.cos(angle) * y + Math.sin(angle) * x;DE>

反坐标旋转：

DE>1.DE>DE>x1 = Math.cos(angle) * x + Math.sin(angle) * y; DE>DE>2.DE>DE>y1 = Math.cos(angle) * y - Math.sin(angle) * x;DE>

 

 

原文链接： http://blog.csdn.net/ityuany/article/details/6654491