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。

#include <AS3/AS3.h> #include <Flash++.h>

using namespace AS3::ui;

static const int COORDBITS = 7; // 7 bits => dim of 128 static const int DIM = 1 << COORDBITS;

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

static int swizzleOffset(int offs) {   int result = 0;   int coordBits = COORDBITS;   int offsHi = offs >> COORDBITS; // take the higher order bits   int coordBits2 = COORDBITS * 2;   while(coordBits--)   {     // put the lowest bit in the "lo" offset bits     // into the highest bit of the result...     // it'll get shifted into a lower position     // as the loop executes     result |= ((offs & 1) << coordBits2);     offs >>= 1;     result >>= 1;     // same for the "hi" offset bits     result |= ((offsHi & 1) << coordBits2);     offsHi >>= 1;     result >>= 1;   }   return result; }

 

// 将一个图像的像素进行混淆 static void swizzlePixels(unsigned *dst, unsigned *src) {     int offs = DIM * DIM;

    while(offs--)     {         int swiz = swizzleOffset(offs);         dst[swiz] = src[offs];     } }

 

//监听鼠标点击事件，然后混淆BitmapData的像素值 static var mouseDownHandler(void *arg, var args) {     flash::events::MouseEvent event = flash::events::MouseEvent(args[0]);     flash::display::Sprite sprite = flash::display::Sprite(event->target); // the container Sprite     flash::display::Bitmap bitmap = flash::display::Bitmap(sprite->getChildAt(0)); // Bitmap is the only child     flash::display::BitmapData bitmapData = bitmap->bitmapData;     // ByteArray corresponding to our ram!     // C ptrs are equivalent to offsets into this ByteArray     flash::utils::ByteArray ram = internal::get_ram();

    // allocate space for the pixels     unsigned *src = new unsigned[DIM * DIM];     unsigned *dst = new unsigned[DIM * DIM];     // copy current pixels directly to ram     bitmapData->copyPixelsToByteArray(bitmapData->rect, ram, src);     // swizzle them!     swizzlePixels(dst, src);     // write new pixels directly from ram     bitmapData->setPixels(bitmapData->rect, ram, dst);     // clean up     delete dst;     delete src;     return internal::_undefined; }

 

int main() {     //取得舞台     flash::display::Stage stage = internal::get_Stage();

    //创建一个Shape     flash::display::Shape myShape = flash::display::Shape::_new();     flash::display::Graphics graphics = myShape->graphics;

    //绘制简单的图形 这是一个像把子一样的圆

    graphics->beginFill(0xff00ff, 0.5);     graphics->drawCircle(64.0, 64.0, 64.0);     graphics->endFill();     graphics->beginFill(0xffff00, 0.5);     graphics->drawCircle(64.0, 64.0, 40.0);     graphics->endFill();     graphics->beginFill(0x00ffff, 0.5);     graphics->drawCircle(64.0, 64.0, 16.0);     graphics->endFill();

    //创建一个BitmapData     flash::display::BitmapData myBitmapData = flash::display::BitmapData::_new(DIM, DIM);     //把图形绘制到这个bitmapdata上

    myBitmapData->draw(myShape);

    // 创建一个Bitmap

    flash::display::Bitmap myBitmap = flash::display::Bitmap::_new(myBitmapData);

    // 加到一个Sprite中，以便显示

    flash::display::Sprite mySprite = flash::display::Sprite::_new();

    mySprite->addChild(myBitmap);     // 增加一个鼠标监听器     mySprite->addEventListener("mouseDown", Function::_new(&mouseDownHandler, NULL));     // 添加到舞台     stage->addChild(mySprite);

    // 这个函数将会使C++与AS3进行同步，以使可以处理鼠标事件。     AS3_GoAsync();

    // 因为运行机制的原因，这行代码是无法到达的。     return 0; }

还是上个图吧。

转载于:https://www.cnblogs.com/qilinzi/archive/2013/05/15/3080980.html

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