[Cocos2d-x For WP8]Progress 进度条

    Cocos2d-x可以有多种进度条的展示方式，进度条的种类是根据进度条运动的方向来区分，包括顺时针，逆时针，从左到右，从右到左，从下到上和从上到下6种方式，这和WP8的进度条是由很大的区别的。那么Cocos2d-x的进度条是需要用图片来进行展示，然后从不同的方向来渐渐把图片显示出来实现进度条的效果。

    第一步需要创建一个CCProgressTo对象和CCProgressTimer对象，我们可以通过CCProgressTo::create(2, 100)方法创建CCProgressTo定义了进度条的时间和图片的百分比，第一个参数是时间是一个CCTime对象，第二个参数是结果显示图片的百分比。通过CCProgressTimer::progressWithFile("cat.png")方法创建CCProgressTimer定义了进度条的图片文件。

   CCProgressTo *to1 = CCProgressTo::create(2, 100);
   CCProgressTimer *left = CCProgressTimer::progressWithFile("cat.png");

    第二步通过CCProgressTimer指针设置进度条的类型。

调用setType设置类型，

kCCProgressTimerTypeRadialCW   顺时针生成

kCCProgressTimerTypeRadialCCW  逆时针生成

kCCProgressTimerTypeHorizontalBarLR 从左到右生成

kCCProgressTimerTypeHorizontalBarRL 从右到左生成

kCCProgressTimerTypeVerticalBarBT 从下到上生成

kCCProgressTimerTypeVerticalBarTB 从上到下生成

left->setType( kCCProgressTimerTypeRadialCW );

    第三步添加到场景，设置位置和重复的频率

  addChild(left);
  left->setPosition(CCPointMake(100, size.height*3/4));
  left->runAction( CCRepeatForever::create(to1));

示例代码：

         //逆时针转动
        CCProgressTo *to1 = CCProgressTo::create(2, 100);
        CCProgressTimer *left = CCProgressTimer::progressWithFile("cat.png");
        left->setType( kCCProgressTimerTypeRadialCW );
        addChild(left);
        left->setPosition(CCPointMake(100, size.height*3/4));
        left->runAction( CCRepeatForever::create(to1));
        //顺时针转动
        CCProgressTo *to2 = CCProgressTo::create(2, 100);
        CCProgressTimer *right = CCProgressTimer::progressWithFile("cat.png");
        right->setType( kCCProgressTimerTypeRadialCCW );
        addChild(right);
        right->setPosition(CCPointMake(100, size.height/4));
        right->runAction( CCRepeatForever::create(to2));

        //从左到右
        CCProgressTo *toHorizontalBar1 = CCProgressTo::create(2, 100);
        CCProgressTimer *leftHorizontalBar = CCProgressTimer::progressWithFile("cat.png");
        leftHorizontalBar->setType( kCCProgressTimerTypeHorizontalBarLR );
        addChild(leftHorizontalBar);
        leftHorizontalBar->setPosition(CCPointMake(400, size.height*3/4));
        leftHorizontalBar->runAction( CCRepeatForever::create(toHorizontalBar1));
        //从右到左
        CCProgressTo *toHorizontalBar2 = CCProgressTo::create(2, 100);
        CCProgressTimer *rightHorizontalBar = CCProgressTimer::progressWithFile("cat.png");
        rightHorizontalBar->setType( kCCProgressTimerTypeHorizontalBarRL );
        addChild(rightHorizontalBar);
        rightHorizontalBar->setPosition(CCPointMake(400, size.height/4));
        rightHorizontalBar->runAction( CCRepeatForever::create(toHorizontalBar2));

        //从底部到顶部
        CCProgressTo *toVerticalBar1 = CCProgressTo::create(2, 100);
        CCProgressTimer *leftVerticalBar = CCProgressTimer::progressWithFile("cat.png");
        leftVerticalBar->setType( kCCProgressTimerTypeVerticalBarBT );
        addChild(leftVerticalBar);
        leftVerticalBar->setPosition(CCPointMake(700, size.height*3/4));
        leftVerticalBar->runAction( CCRepeatForever::create(to1));
        //从顶部到底部
        CCProgressTo *toVerticalBar2 = CCProgressTo::create(2, 100);
        CCProgressTimer *rightVerticalBar = CCProgressTimer::progressWithFile("cat.png");
        rightVerticalBar->setType( kCCProgressTimerTypeVerticalBarTB );
        addChild(rightVerticalBar);
        rightVerticalBar->setPosition(CCPointMake(700, size.height/4));
        rightVerticalBar->runAction( CCRepeatForever::create(toVerticalBar2));

运行的效果：