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标题: 抛物线运动物理课件制作 [打印本页]

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作者: etthink    时间: 2010-5-31 23:59
标题: 抛物线运动物理课件制作
原文地址：http://www.lxlong.net/?p=1793
http://www.lxlong.net/wp-content/uploads/2010/05/paoWuYunDong.swf

1. 
   
2. var oldX:Number = ball_mc.x;
   
3. var oldY:Number = ball_mc.y;
   
4. var v:Number;
   
5. var g:Number;
   
6. var time:Number;
   
7. var visi:Boolean = true;
   
8. var b:Boolean;
   
9. var drawSp:Shape=new Shape();
   
10. var xArr:Array = [];
    
11. var yArr:Array = [];
    
12. var ind:uint;
    
13. addChild(drawSp);
    
14. for (var i:int=0; i<=30; i++)   {
    
15. graphics.lineStyle(0,0xcccccc);
    
16. if (i % 5 == 0)    {
    
17.   graphics.lineStyle(0,0×000000);
    
18. }
    
19. graphics.moveTo(100+i*20,50);
    
20. graphics.lineTo(100+i*20,50+30*20);
    
21. graphics.moveTo(100,50+i*20);
    
22. graphics.lineTo(100+30*20,50+i*20);
    
23. }
    
24. start_btn.addEventListener(MouseEvent.CLICK,startFunc);
    
25. function startFunc(e)   {
    
26. addEventListener(Event.ENTER_FRAME,onFrame);
    
27. b = true;
    
28. xball_mc.x = ball_mc.x = oldX;
    
29. yball_mc.y = ball_mc.y = oldY;
    
30. v = Number(input_txt.text);
    
31. g = 1.5;
    
32. time = 0;
    
33. xArr = [];
    
34. yArr = [];
    
35. drawCircle(ball_mc.x,ball_mc.y);//每次先在起点处画个点
    
36. xArr[0]=100;
    
37. yArr[0]=50;//每次把这个位置预先放入坐标数组的首位
    
38. }
    
39. function onFrame(e)   {
    
40. time++;
    
41. time_txt.text=(Math.round(time*10)/100).toString();
    
42. ball_mc.x =100+  v * (time  );
    
43. ball_mc.y +=  g * (time / 10) * (time / 10) / 2/3.3;
    
44. xball_mc.x =100+ v * (time )
    
45. yball_mc.y +=  g * (time / 10 )*( time / 10) / 2/3.3;
    
46. if (time >= 100)    {
    
47.   removeEventListener(Event.ENTER_FRAME,onFrame);
    
48.   b = false;
    
49. }
    
50. drawCircle(ball_mc.x,ball_mc.y);
    
51. xArr.push(ball_mc.x);
    
52. yArr.push(ball_mc.y);
    
53. ind = xArr.length;
    
54. }
    
55. function drawCircle(xx:Number,yy:Number)   {
    
56. drawSp.graphics.beginFill(0×000000);
    
57. drawSp.graphics.drawCircle(xx,yy,1);
    
58. }
    
59. reset_btn.addEventListener(MouseEvent.CLICK,reset);
    
60. function reset(e)   {
    
61. xball_mc.x = ball_mc.x = oldX;
    
62. yball_mc.y = ball_mc.y = oldY;
    
63. removeEventListener(Event.ENTER_FRAME,onFrame);
    
64. }
    
65. prev_btn.addEventListener(MouseEvent.CLICK,prev);
    
66. function prev(e)   {
    
67. if (! b)    {
    
68.   ind > 5 ? ind -=  5:ind = 0;
    
69.   xball_mc.x = ball_mc.x = xArr[ind];
    
70.   yball_mc.y = ball_mc.y = yArr[ind];
    
71. }
    
72. }
    
73. next_btn.addEventListener(MouseEvent.CLICK,nextF);
    
74. function nextF(e)   {
    
75. if (! b)    {
    
76.   ind < xArr.length – 6 ? ind +=  5:ind = xArr.length – 1;
    
77.   xball_mc.x = ball_mc.x = xArr[ind];
    
78.   yball_mc.y = ball_mc.y = yArr[ind];
    
79. }
    
80. }
    
81. clear_btn.addEventListener(MouseEvent.CLICK,clearFunc);
    
82. function clearFunc(e)   {
    
83. drawSp.graphics.clear();
    
84. }
    
85. 
    
86. visible_btn.addEventListener(MouseEvent.CLICK,visibleFunc);
    
87. function visibleFunc(e)   {
    
88. xball_mc.visible = ! xball_mc.visible;
    
89. yball_mc.visible = ! yball_mc.visible;
    
90. (visi=!visi) ? visible_btn.alpha =1:visible_btn.alpha = 0.5;
    
91. }

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