守望者--AIR技术交流

标题: FlasCC例子研究之bitmapdata [打印本页]

---

作者: 破晓    时间: 2015-5-29 10:32
标题: FlasCC例子研究之bitmapdata

bitmapdata是FlasCC官方例子02_Interop中的例子。这例子比起c++interop来说，多了一个鼠标事件监听。

我们逐行分析一下吧。

1. #include <AS3/AS3.h>
   
2. #include <Flash++.h>
   
3. 
   
4. using namespace AS3::ui;
   
5. 
   
6. static const int COORDBITS = 7; // 7 bits => dim of 128
   
7. static const int DIM = 1 << COORDBITS;

复制代码

这个函数主要是根据一个给出的offset值，返回一个计算后的值

1. static int swizzleOffset(int offs)
   
2. {
   
3.   int result = 0;
   
4.   int coordBits = COORDBITS;
   
5.   int offsHi = offs >> COORDBITS; // take the higher order bits
   
6.   int coordBits2 = COORDBITS * 2;
   
7.   while(coordBits--)
   
8.   {
   
9.     // put the lowest bit in the "lo" offset bits
   
10.     // into the highest bit of the result...
    
11.     // it'll get shifted into a lower position
    
12.     // as the loop executes
    
13.     result |= ((offs & 1) << coordBits2);
    
14.     offs >>= 1;
    
15.     result >>= 1;
    
16.     // same for the "hi" offset bits
    
17.     result |= ((offsHi & 1) << coordBits2);
    
18.     offsHi >>= 1;
    
19.     result >>= 1;
    
20.   }
    
21.   return result;
    
22. }
    
23. 
    
24. 
    
25. 
    
26. // 将一个图像的像素进行混淆
    
27. static void swizzlePixels(unsigned *dst, unsigned *src)
    
28. {
    
29.     int offs = DIM * DIM;
    
30. 
    
31.     while(offs--)
    
32.     {
    
33.         int swiz = swizzleOffset(offs);
    
34.         dst[swiz] = src[offs];
    
35.     }
    
36. }
    
37. 
    
38. 
    
39. 
    
40. //监听鼠标点击事件，然后混淆BitmapData的像素值
    
41. static var mouseDownHandler(void *arg, var args)
    
42. {
    
43.     flash::events::MouseEvent event = flash::events::MouseEvent(args[0]);
    
44.     flash::display::Sprite sprite = flash::display::Sprite(event->target); // the container Sprite
    
45.     flash::display::Bitmap bitmap = flash::display::Bitmap(sprite->getChildAt(0)); // Bitmap is the only child
    
46.     flash::display::BitmapData bitmapData = bitmap->bitmapData;
    
47.     // ByteArray corresponding to our ram!
    
48.     // C ptrs are equivalent to offsets into this ByteArray
    
49.     flash::utils::ByteArray ram = internal::get_ram();
    
50. 
    
51.     // allocate space for the pixels
    
52.     unsigned *src = new unsigned[DIM * DIM];
    
53.     unsigned *dst = new unsigned[DIM * DIM];
    
54.     // copy current pixels directly to ram
    
55.     bitmapData->copyPixelsToByteArray(bitmapData->rect, ram, src);
    
56.     // swizzle them!
    
57.     swizzlePixels(dst, src);
    
58.     // write new pixels directly from ram
    
59.     bitmapData->setPixels(bitmapData->rect, ram, dst);
    
60.     // clean up
    
61.     delete dst;
    
62.     delete src;
    
63.     return internal::_undefined;
    
64. }
    
65. 
    
66. 
    
67. 
    
68. int main()
    
69. {
    
70.     //取得舞台
    
71.     flash::display::Stage stage = internal::get_Stage();
    
72. 
    
73.     //创建一个Shape
    
74.     flash::display::Shape myShape = flash::display::Shape::_new();
    
75.     flash::display::Graphics graphics = myShape->graphics;
    
76. 
    
77.     //绘制简单的图形 这是一个像把子一样的圆
    
78. 
    
79.     graphics->beginFill(0xff00ff, 0.5);
    
80.     graphics->drawCircle(64.0, 64.0, 64.0);
    
81.     graphics->endFill();
    
82.     graphics->beginFill(0xffff00, 0.5);
    
83.     graphics->drawCircle(64.0, 64.0, 40.0);
    
84.     graphics->endFill();
    
85.     graphics->beginFill(0x00ffff, 0.5);
    
86.     graphics->drawCircle(64.0, 64.0, 16.0);
    
87.     graphics->endFill();
    
88. 
    
89.     //创建一个BitmapData
    
90.     flash::display::BitmapData myBitmapData = flash::display::BitmapData::_new(DIM, DIM);
    
91.     //把图形绘制到这个bitmapdata上
    
92. 
    
93.     myBitmapData->draw(myShape);
    
94. 
    
95.     // 创建一个Bitmap
    
96. 
    
97.     flash::display::Bitmap myBitmap = flash::display::Bitmap::_new(myBitmapData);
    
98. 
    
99.     // 加到一个Sprite中，以便显示
    
100. 
     
101.     flash::display::Sprite mySprite = flash::display::Sprite::_new();
     
102. 
     
103.     mySprite->addChild(myBitmap);
     
104.     // 增加一个鼠标监听器
     
105.     mySprite->addEventListener("mouseDown", Function::_new(&mouseDownHandler, NULL));
     
106.     // 添加到舞台
     
107.     stage->addChild(mySprite);
     
108. 
     
109.     // 这个函数将会使C++与AS3进行同步，以使可以处理鼠标事件。
     
110.     AS3_GoAsync();
     
111. 
     
112.     // 因为运行机制的原因，这行代码是无法到达的。
     
113.     return 0;
     
114. }

复制代码

还是上个图吧。

[attach]1165[/attach]

http://www.cnblogs.com/geniusalex/archive/2013/05/15/3080980.html

---

欢迎光临 守望者--AIR技术交流 (http://www.airmyth.com/)