ActionScript2.0：三角形角度的绘制弧线

Question

如何使用Flash动作脚本2.0在随机化创建的三角形角度中绘制弧线。

谢谢大家。 alt text http://www.freeimagehosting.net/uploads/8289d7feff.png

我想在每个三角形的角度画出红色弧线。注意：三角形将随机创建。

Answer 1

一种简单的方法是在每个角上绘制一个圆，然后使用三角形的副本来掩盖圆，以便只有内圆弧可见。

例如，在名为“circle”的库中制作一个包含以剪辑插入点为中心的未填充的红色圆圈的影片剪辑（请确保在其属性中勾选“导出为ActionScript”）。

然后你就可以画出你的三角形是这样的：

import flash.geom.Point; 

function randomPoint():Point { //return a random point on the stage 
    var p:Point = new Point(Math.floor(Math.random()*Stage.width), Math.floor(Math.random()*Stage.height)); 
    return p; 
} 

function drawTriangle(mc:MovieClip, q1:Point, q2:Point, q3:Point):Void {//draw a triangle through 3 points 
    var stroke=2;//line weight of triangle 
    mc.lineStyle(stroke, 0x000000, 100, true, "none", "round", "round"); 
    mc.moveTo(q1.x, q1.y); 
    mc.lineTo(q2.x, q2.y); 
    mc.lineTo(q3.x, q3.y); 
    mc.lineTo(q1.x, q1.y); 
} 

function arcTriangle():MovieClip { //main function to draw a triangle with corner arcs 
    //make a new movieclip t which will hold our triangle parts 
    var depth=this.getNextHighestDepth(); 
    var t:MovieClip = this.createEmptyMovieClip("t"+depth, depth); 

    //define 3 random points (stored as properties of t) 
    t.p1=randomPoint(); 
    t.p2=randomPoint(); 
    t.p3=randomPoint(); 

    //draw a triangle 
    t.createEmptyMovieClip("triangle", 0); 
    drawTriangle(t.triangle, t.p1, t.p2, t.p3); 

    //draw a filled triangle to use as a mask 
    t.createEmptyMovieClip("mask", 1); 
    t.mask.beginFill(0xF0F0F0); 
    drawTriangle(t.mask, t.p1, t.p2, t.p3); 
    t.mask.endFill(); 
    t.mask._alpha=0; 

    //add a red circle to each corner 
    t.createEmptyMovieClip("arcHolder", 2); 
    t.arcHolder.attachMovie("circle", "arc1",1,{_x:t.p1.x, _y:t.p1.y}); 
    t.arcHolder.attachMovie("circle", "arc2",2,{_x:t.p2.x, _y:t.p2.y}); 
    t.arcHolder.attachMovie("circle", "arc3",3,{_x:t.p3.x, _y:t.p3.y}); 

    //mask the circles so only the interior arcs are visible 
    t.arcHolder.setMask(t.mask); 

    return t; 
} 

var myTriangle:MovieClip = arcTriangle(); 

et voila http://roi.webfactional.com/img/so/triangle.jpg