用Flash AS实现画图的详细讲解

　　 旋转的长方体

　　代码：

a = 50*Math.cos(n*Math.PI/180); 
b = 100*Math.sin(n*Math.PI/180); 
c1 = 300; 
c2 = 200; 
_root.createEmptyMovieClip("triangle", 1); 
with (_root.triangle) { 
  lineStyle(1, 0x000000, 50); 
  moveTo(a+c1, b+c2); 
  lineTo(50*math.cos((n+90)*math.pi/180)+
c1,100*math.sin((n+90)*math.pi/180)+c2); 
  lineTo(50*math.cos((n+180)*math.pi/180)+
c1,100*math.sin((n+180)*math.pi/180)+c2); 
  lineTo(50*math.cos((n+270)*math.pi/180)+
c1,100*math.sin((n+270)*math.pi/180)+c2); 
  lineTo(50*math.cos((n+360)*math.pi/180)+
c1,100*math.sin((n+360)*math.pi/180)+200); 
  lineStyle(1, 0x000000, 50); 
  moveTo(a+200, b+100); 
  lineTo(50*math.cos((n+90)*math.pi/180)+
200,100*math.sin((n+90)*math.pi/180)+100); 
  lineTo(50*math.cos((n+180)*math.pi/180)+
200,100*math.sin((n+180)*math.pi/180)+100); 
  lineTo(50*math.cos((n+270)*math.pi/180)+
200,100*math.sin((n+270)*math.pi/180)+100); 
  lineTo(50*math.cos((n+360)*math.pi/180)+
200,100*math.sin((n+360)*math.pi/180)+100); 
  lineStyle(1, 0x000000, 30); 
  moveTo(a+200, b+100); 
  lineTo(a+c1, b+c2); 
  moveTo(50*math.cos((n+90)*math.pi/180)
+c1,100*math.sin((n+90)*math.pi/180)+c2); 
  lineTo(50*math.cos((n+90)*math.pi/180)
+200,100*math.sin((n+90)*math.pi/180)+100); 
  moveTo(50*math.cos((n+180)*math.pi/180)
+c1,100*math.sin((n+180)*math.pi/180)+c2); 
  lineTo(50*math.cos((n+180)*math.pi/180)
+200,100*math.sin((n+180)*math.pi/180)+100); 
  moveTo(50*math.cos((n+270)*math.pi/180)
+c1,100*math.sin((n+270)*math.pi/180)+c2); 
  lineTo(50*math.cos((n+270)*math.pi/180)
+200,100*math.sin((n+270)*math.pi/180)+100); 
}

　　 用as做烛光，相当逼真。

　　代码：

offsetX = 275;
offsetY = 100;
left = 0;
right = 0;
top = 0;
leftGoal = 0;
rightGoal = 0;
topGoal = 0;
rate = .2;
decay = .9;
for (var i = 0; i<shapes.length; i++) {
  var name = "flame"+i;
  createEmptyMovieClip(name, i);
  _root[name]._x = offsetX;
  _root[name]._y = offsetY;
  _root[name].offset = parseInt(shapes[i].split("")[0]);
  _root[name].fade = parseInt(shapes[i].split("")[1]);
}
createEmptyMovieClip("heat", i);
heat._x = offsetX;
heat._y = offsetY;
checkEdge = function (cur, side, dist) { 
  change = 0;if (cur>side) {
    change -= Math.random()*dist;
    } else if (cur<-side) {
      change += Math.random()*dist;
    }
return change;
};
onEnterFrame = function () {
  leftGoal += Math.random()*6-3;
  leftGoal += checkEdge(leftGoal,10, 3);
  rightGoal += Math.random()*6-3;
  rightGoal += checkEdge(rightGoal, 10,3);
  topGoal += Math.random()*8-4;
  topGoal += checkEdge(topGoal, 15, 4);
  leftAccel = (leftGoal-left)*rate;
  leftVeloc += leftAccel;
  leftVeloc *= decay;
  left += leftVeloc;
  rightAccel = (rightGoal-right)*rate;
  rightVeloc += rightAccel;
  rightVeloc *= decay;right += rightVeloc;
  topAccel = (topGoal-top)*rate;
  topVeloc += topAccel;
  topVeloc *= decay;top += topVeloc;
  for (var i = 0; i<shapes.length; i++) {
    with (_root["flame"+i]) {
      clear();colors = [0xFCE39C, 0xF4AC35];
      alphas = [_root["flame"+i].fade, 
_root["flame"+i].fade-20];
      ratios = [70, 255];
      matrix = {matrixType:"box", x:-50, 
y:50, w:100, h:200, r:0};
      beginGradientFill("radial",colors,
 alphas, ratios, matrix);
      lineStyle(1, 0x000000, 0);
      moveTo(0-left+right,0-top-_root
["flame"+i].offset*2);
      curveTo(40+_root["flame"+i].
offset+right, 180,0, 200);
      curveTo(-40-_root["flame"+i].
offset-left, 180, 0-left+right, 
0-top-_root["flame"+i].offset*2);
      endFill();
    }
  } with (_root.heat) {
    clear();colors = [0x986932, 0x986932];
    alphas = [70, 0];
    ratios = [20, 255];
    matrix = {matrixType:"box", 
x:-20-left/2, y:120-top, w:40+right/2,h:120+top, r:0
};
  beginGradientFill("radial", 
colors, alphas, ratios, matrix);
  lineStyle(1,0x000000, 0);
  moveTo(-50, 0);
  lineTo(50, 0);
 lineTo(50, 200);
  lineTo(-50, 200);
  lineTo(-50,0);
  endFill();
}
duplicateMovieClip(
_root["flame"+(shapes.length-1)], 
"shapeMask",shapes.length+1);
heat.setMask(shapeMask);
};

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