草根站长论坛 » 站长设计素材 » Flash打造的随机画圆弧效果

晴天 发表于 2008-6-11 15:59

Flash打造的随机画圆弧效果

[align=center][url=http://www.blueidea.com/articleimg/2008/03/5508/draw_arc.swf][b][color=#0000ff]点击这里看演示[/color][/b][/url][/align]贴一下代码_-W!}YrJu``
有兴趣的看一下吧
4V~1w+dg*\ 刚加了下注释OI%~ q'sk6Q:l
[code]
%WN)c*hS //******************* draw_arc ************************-zPe7iX$JX U q
//******************* 作者：boenlee *******************'`D"ta6wz{pL
//舞台元件：
(~/|#Fd'r eF //可视区域元件--maskj
d/U2JP_
//移动按钮--up_btn, down_btn, left_btn, right_btn
*}Xb;S)lC$xw6k //文本框--angle_txt, time_txt, r_txt, thickness_txtl$I@)a?e
K
//复选按钮--trace_check, leaf_check jKqWAG
//重画按钮--redraw_btn
.~@3j0E$c Ih6F //库链接元件：9CX-A.M8Khsu:~8@2@
//叶子--leaf
8P]:s z6VZ)D7JO$p8?&Tf //***************************************************

i-N\}0P //画小于等于45度的圆弧，任意角度开始
V9q A#i5?N\:OD(C //mc：目标mc名称 ?-J:t1k_f"KdY
//ox：原点x位置
3]0oP SAbt*HG4@ //oy：原点y位置
*C%rU!A1S5s5j //r：半径
(hX6L:dB8Rd$w1t^ //origin_angle：起始角度
z],F ?v&`!H,[9U|E //angle：弧的角度，正数顺时针画弧，负数逆时针画弧
[ J7~8V{%`^ //thickness：线的粗细
`@/PNz{ //rbg：线的颜色
I`[Lt)h @ //alpha：线的透明度
N&\6Z0e(^5i)v //返回：圆弧终点坐标，终点为角度大的点，与angle符号无关0dr5M-Se/y
function draw_small_arc (mc:MovieClip, ox:Number, oy:Number, r:Number, origin_angle:Number, angle:Number, thickness:Number, rbg:Number, alpha:Number):Object {mC/Dv+\ GI
    var origin_angle:Number = origin_angle % 360;&WpBl6dI
    var angle:Number = angle % 360;x \M0s
[j!m _
    origin_angle = angle < 0 ? origin_angle + angle : origin_angle;
2go x Dz;MB:{[v     angle = Math.abs (angle);]Je(A%e s%M
    angle = angle > 45 ? 45 : angle;
'nj7K2pv7f:\.E I:t:t     var ctrl_r:Number = maintain_digit (1 / cosD (angle / 2) * r, 4); M9HbJ3yS
    var ctrl_sin:Number = maintain_digit (sinD (origin_angle + angle / 2), 4);
,y!aU/W'avf;x     var ctrl_cos:Number = maintain_digit (cosD (origin_angle + angle / 2), 4);
,nS6Lf ~     var org_sin:Number = maintain_digit (sinD (origin_angle), 4);
q~Gi$\'j[     var org_cos:Number = maintain_digit (cosD (origin_angle), 4);&S{vby#]4Gc"i
    var achr_sin:Number = maintain_digit (sinD (origin_angle + angle), 4);+x8ozpV
    var achr_cos:Number = maintain_digit (cosD (origin_angle + angle), 4);
{(C#L3PH+I]     with (mc) {bIR D^ZN#M
        lineStyle (thickness, rbg, alpha, false, "normal", "none");
5T*xbsWLI         moveTo (org_cos * r + ox, org_sin * r + oy);
h3bj$X~Z         curveTo (ctrl_cos * ctrl_r + ox, ctrl_sin * ctrl_r + oy, achr_cos * r + ox, achr_sin * r + oy);$a~y w(^} N-k
    }*T C1n+m P
    return {x:achr_cos * r + ox, y:achr_sin * r + oy};8r4R%R(c-ym3e;F4bf
}8WwW1f8O h
[#rse
//画小于等于360度的圆弧，任意角度开始U0^ BLhFRX6[
//参数及返回值与draw_small_arc函数相同E"xo7H6P,O
function draw_arc (mc:MovieClip, ox:Number, oy:Number, r:Number, origin_angle:Number, angle:Number, thickness:Number, rbg:Number, alpha:Number):Object {
zb"\8Iz2Tjr     var origin_angle:Number = angle < 0 ? origin_angle + angle : origin_angle; xdL @@
    var angle:Number = Math.abs (angle);N:?'h3a0`!o_
    var times:Number = int (angle / 45);
u6l3T.CV5rY     var last_angle:Number = angle % 45;
C5qUIfY#j     if (times >= 8) {$dK-{)v,B#cTe
        times = 8;
?*bB4s(@~         last_angle = 0;7`2Jd&h.Kz,V^
    }KV,A]J
    for (var i:Number = 0; i < times; i++) {T0p?'du.Ih
        draw_small_arc (mc, ox, oy, r, 45 * i + origin_angle, 45, thickness, rbg, alpha);
V;{N(rk ~h d_     }
-l?$Llqr1|     return draw_small_arc (mc, ox, oy, r, 45 * times + origin_angle, last_angle, thickness, rbg, alpha);^2_d ~i%YD
}
5E)z"jl7R9K //小数保留8MI'_ CADv*{%]
//val：要处理数值
6]vH0s#Cyy //maintain：保留位数3H#c)q#vBYK
//返回：处理后的数
-M)RT;IZG F function maintain_digit (val:Number, maintain:Number):Number {wU7LRCIr1\d.Z
    var multiple:Number = Math.pow (10, Math.abs (maintain));
"A^:`p|3|     return Math.round (val * multiple) / multiple;
\n9qJh T%n }
l1an|MO wmH%]1a //以角度为参数计算sin值+ER!q(T*Ku/c$C.z
function sinD (angle:Number):Number {
ue*u\(Bo:Q     return Math.sin (Math.PI / 180 * angle);
vD;lJO_ }
:B Z*q|&qO+amM&g //以角度为参数计算cos值X(ue IC6mH
function cosD (angle:Number):Number {3s5HgCC-I
    return Math.cos (Math.PI / 180 * angle);vg7oppoC
}
2yT/iTK@&D //随机颜色
V W'V\L3O^|9r;zU function rnd_color ():Number {"j.f0}]B,T'^
    return random (255) << 16 | random (255) << 8 | random (255); wMx)mY*\@
}
U%gsg1tx6HcG{i4~K
//弧线颜色数组，由于随机颜色比较丑，所以选择几个比较好的颜色N*xq2t'R8X:A&H
var color_arr:Array = [0xFF1111, 0xEDB83D, 0xEBEB1D, 0x99E91F, 0x20E91F, 0x23E4E3, 0x1DC2EB, 0x1B45ED, 0x6F1BED, 0xC21BED, 0xEB1DEB, 0xF017AF, 0xF01784, 0xFFFFFF];
YU%O5y D2Zf //叶子颜色数组，原因同上
Rz#[1PA_Z.J4`B var leaf_color_arr:Array = [0x25EB25, 0xF3F347, 0x4AF09D, 0xF2AD48];
g#OGBBoP //起始角度
+H(Y!i n Oru.m3Q3o4j var origin_angle:Number;uC;w2vp#`Sw)g
//弧的角度
.I:yh${Dn*? var angle:Number;(_7c1a*@~#a4q ]
//弧度是否随机
]K9N'[GTYfz var angle_rnd:Boolean;
1^?/m YF:E1I //方向+[j(O4Ku"e1vA`
var dir:Number;
$Z|$I]}9im6_7K //上一个弧的方向6Qd
k#xEP-Pnv
var old_dir:Number;@byW:p*klN
//弧的个数%k@9q SFHy
var time:Number;!L2GL8FK9n_]3S
//弧所在圆的坐标u\ mC'Y `nn
var posx:Number;:\ D)S}iw:{#z#G
var posy:Number;
m9FO&`;dD //弧终点位置dFtj#Im
var pos_obj:Object;
tpd1dY-zk'Q //半径a-Pf`F pEIbFA
var r:Number;
9k]s"h-hj0X //弧线粗细
#Y:L Hdl,Hq[%CJ&b var thickness:Number;7p1P:A a.J L
//是否跟踪2B+^!i.fsL3z-LGc+q
var is_trace:Boolean = false;
Ck[i/Q+sAp //是否有树叶生长效果
Jq6f'C4e var leaf_grow:Boolean = false;
^IM)H(kcTI P //用于画弧线的mc*a,]n9X)@]
var line_mc:MovieClip;)z1xpi(\
//初始化属性
c? H6pb2dj function init_prop () {4]F(fNQ(xr7Ar
    line_mc.removeMovieClip ();i*FF(Y*u_;NY&}?
    line_mc = this.createEmptyMovieClip ("line_mc", 1);
2Z%h%M8\6o*q~'a     line_mc.setMask (mask);
bh-iO,K
|~2V Z     line_mc._x = mask._x;
2OrCS bN7D*T$J     line_mc._y = mask._y;I?9d3u2EN~i+o
    origin_angle = random (4) * 90;
/n6?4sF5{     angle = get_txt_value (angle_txt, 0, 0, 10, 360);
5B2v6QvC,F0_$b2w     if (angle == 0) {
:II%VT }         angle_rnd = true;#_my.G@Eh
    } else {EKwJa!N u
        angle_rnd = false;av9ZV
A1c
    })s dJ%Oc2@n7E Iz
f"d
    dir = random (2) ? 1 : -1;
QL m-U gG9o)D     posx = random (100) - 50;]1_j;KI/B {Ke0K*_
    posy = random (100) - 50;
2|oi M)KA!C"`     time = get_txt_value (time_txt, 50, 10, 10, 200);U1Z:AJ/S0G y
    r = get_txt_value (r_txt, 20, 5, 5, 50);
#Cpl|N'J(Q#zUH     thickness = get_txt_value (thickness_txt, 5, 1, 1, 10);g*ZwSY w
zl](`
}
1FO)uY'?m5Lm //主函数
,z3c5W|\{_ function main () {2j:e-pQ^5YA
    if (--time > 0) {
Vw9E2a&w+e.dX U`         dir = random (2) ? 1 : -1;6E+z,Y X.nY/x:D*w}
        origin_angle += angle;
&Ne AX(B?v2M         //如果当前弧的方向与前一个的不同，计算当前弧所在圆的原点位置
.H]Scr"KX:X         if (dir + old_dir == 0) {
|,iDdm
ZtL             posx += cosD (origin_angle) * 2 * r;+JI5AC'Jj0o9SB
            posy += sinD (origin_angle) * 2 * r;
UY$oc9e ?             origin_angle += 180;
]$Rh$saW+v         }
%q;g7GV@
?.b(^z#M         if (angle_rnd) {
7r2J-S7T0wxd             angle = dir * (random (50) + 50);
C7wL;Z"]9^"r[n         } else {tl9E x V)k'd*x"l$e
            angle = dir * Math.abs (angle);
#c'N*HHC&X,Sq;|         }
-A!|/[,sc@         pos_obj = draw_arc (line_mc, posx, posy, r, origin_angle, angle, thickness, color_arr[random (color_arr.length)], 100);6V};~6bV-G6PU[4b
        //加载树叶
0?5I2C+ex         if (leaf_grow) {
4nWY
|HQ4L7n*K7VM             line_mc.attachMovie ("leaf", "leaf" + time, time, {_x:pos_obj.x, _y:pos_obj.y, _rotation:random (360), _xscale:random (50) + r * 2 + thickness * 5, _yscale:random (50) + r * 2 + thickness * 5, _alpha:random (100) + thickness * 5});
Zwf*^0Y&P(v             var leaf_color:Color = new Color (line_mc["leaf" + time]);| \n B7x!TqW.pE
            leaf_color.setRGB (leaf_color_arr[random (leaf_color_arr.length)]);

`:eY#h$},w         }
W;x1G4c'`4x
Y pH         //跟踪  9C:h)iw.A%z!HL,AL
        if (is_trace) {
V!\Mhe}             line_mc._x = mask._x - pos_obj.x;$?;ByIB^
            line_mc._y = mask._y - pos_obj.y;
E8N_ SI'Lq         }
f!c)D"eM&BFbS3{         old_dir = dir;
yoc#B"@7^r0JP     } else {
b&R3R+g5}1p9_         delete line_mc.onEnterFrame;
*jC(?wz:D fx9r     };m[P}5}6^.k0B)MH6Q
}&V;x5J"la*n(u
//获取文本框内容，为数值B
[:Dq3Ra)b
//txt_name：文本框名称
J#vG)`s&|C //nan_val：文本内容非数字时所取值 fejyuM
//zero_val：文本内容为0时所取值e$d1Y7it'G:dL)W7I{
//min_val：文本内容最小值@)p,?%FH.sa+Mf:}
//max_val：文本内容最大值5{OBP ]f0br
function get_txt_value (txt_name:TextField, nan_val:Number, zero_val:Number, min_val:Number, max_val:Number) {
Ma~ I3|NFu     if (isNaN (Number (txt_name.text))) {
3x-x:X,m0~+niT,K!s$W         txt_name.text = String (nan_val);by IXQB{
    } else if (Number (txt_name.text) == 0) {
D
o:BKO_'j6~         txt_name.text = String (zero_val);
W`;Krpk     } else if (Number (txt_name.text) < min_val) {J"?6M(j5I H&R
t
        txt_name.text = String (min_val);
)|q3\}F
L\dP%~     } else if (Number (txt_name.text) > max_val) {7o.v o*^ X@M0n
        txt_name.text = String (max_val);
I7Xm]*n3c$sa     }9\[%m C,QEBm|WH
    return Number (txt_name.text);8h1`)i#\'}+}3}
}
,d:xA2\HQ;Mm#|!W //重画#@ v~K+G$}
redraw_btn.onRelease = function () {
7a-t*g0Dt)nK'Yc     delete line_mc.onEnterFrame;
0uyNKSR     init_prop ();
qP!X SB
z\$v/}     line_mc.onEnterFrame = main;
F"uOa;["Fw D)C };0tT5V&p KMLD N]
//选择是否跟踪YiqQ8D
r
trace_check.onRelease = function () {$`Y/bv.nwl-iE
    is_trace = !is_trace;{ `~{#AM+Xnr M&R
    this.gotoAndStop (Number (is_trace) + 1);
Ow*crLi"T`u };
0d(}y1Q~S5HA //选择是否生长树叶Jr4\/~hS#`
leaf_check.onRelease = function () {wzYl.K-Y
    leaf_grow = !leaf_grow;
[3[H\]1]     this.gotoAndStop (Number (leaf_grow) + 1);
5d3\'kn@$T };
Q stVm Yc var keep_moving:MovieClip = this.createEmptyMovieClip ("keep_moving", 2);G7J!~ j$G\])}
var speed:Number = 10;$JC7tK:G/Q7v,B3S
//移动line_mc
cp Ub0woEmy] function moving (speedx:Number, speedy:Number) {1Tzr:M8S2QMJ8P-Uh
    keep_moving.onEnterFrame = function () {)_Ry%R3T3i'D&N"F
        line_mc._x += speedx;
.G~,{u$Z Ly w         line_mc._y += speedy;
4_n(x#~!eCYfK     };*^(lH/dFV
bJ
}
V,X.K2W ?]s E7s //停止移动
3Y
qwZ;x o function stop_move () {3O3HrQ#H;k6s3x
    delete keep_moving.onEnterFrame;O{ ~7B1bw J/{yS
}
8c$f,Cs1S|P8H-w //按钮控制(G1S#YU.U+o
up_btn.onPress = function () {
.`4G#Upmt}     moving (0, speed);
[C+tE,KX };
zh0t5n/Cb,_ down_btn.onPress = function () {
J)}/nhK V1F!nP     moving (0, -speed);
i%EXJ:n){%b };
Vj\W4t(qR q left_btn.onPress = function () { t!R"O}4m
    moving (speed, 0);
J
Iu0rnz%F*C${ };?o.{5QY Xl8a
right_btn.onPress = function () {
j9q0} ve     moving (-speed, 0);_%o;h)PDi/~
};
u)H L;c0@r5E9s up_btn.onRelease = up_btn.onReleaseOutside = down_btn.onRelease = down_btn.onReleaseOutside = left_btn.onRelease = left_btn.onReleaseOutside = right_btn.onRelease = right_btn.onReleaseOutside = function () {f7M{#Zx%u8YR
    stop_move ();!`3}i2w j$N$jC
}; KQZ.u$w af
//键盘控制dn0Qw%tF,Tgx\
var key_lis:Object = new Object ();

He a(j,S2i0iF}@ key_lis.onKeyDown = function () {
2I4w.BE.s8Zte     switch (Key.getCode ()) {#uT kQ;bs X
    case 37 :
6CRn5f/z2F:FOr         moving (speed, 0);
1E8rp,Lc*B J         break;xx}Y9e0O:|8W
    case 38 :
xK^.X&H6H G         moving (0, speed);
G"G"L2CN(x y         break;
8Mzij+[W2t;_d     case 39 :
G8\'J+w)p gf         moving (-speed, 0);$\ jlg9y0iD
        break;
9z1q&Of.ZN     case 40 :1v0k4o-e-]2^ ~
        moving (0, -speed);:tE Ur}Z7{Z/f
        break;
+g,vW2z dD.q)n(P     }
3[{z'zW/U;j ka };C_C8X9Uys;s mh
key_lis.onKeyUp = function () {
T.w9\'N!S7vJ f*d     stop_move ();
d(yQ!?Z*@
g }; ?@+Vos]x
Key.addListener (key_lis);D"[8PF,i
init_prop (); \1p|8MbnO
line_mc.onEnterFrame = main;$?uzW$[;L M%B
[/code]

qrst801 发表于 2008-6-20 13:57

诸葛马水上步行球水上滚筒诸葛马丽妍堂手摇船

*** 作者被禁止或删除 内容自动屏蔽 ***

查看完整版本: Flash打造的随机画圆弧效果