cocos2dx用DrawNode代替DrawPrimitives 画粗线、画不会被精灵挡
工作需要，画一条线，连接屏幕中点和触摸点，这条线要很粗，要能灵活的调整zOrder。 在这个要求下，我先用了 glLineWidth(10)和DrawPrimitives::drawLine(……)重写了draw方法实现了这个功能。 但是后来却发现杀千刀的glLineWidth，10-200没有任何变化，再后
工作需要，画一条线，连接屏幕中点和触摸点，这条线要很粗，要能灵活的调整zOrder。
在这个要求下，我先用了
glLineWidth(10)和DrawPrimitives::drawLine(……)重写了draw方法实现了这个功能。
但是后来却发现杀千刀的glLineWidth，10-200没有任何变化，再后来又发现，画出的线会被精灵华丽的挡
住，就算是把精灵的zOrder设为负数也无济于事。
无奈开始了百度之旅，论坛上发现了DrawNode这个东西，下手一试，果然有效。
DrawNode是将画出的图形作为Node存在于程序中的，可以和其他的Node一样随意的调整zOrder，而且也没有OpenGL 10点宽度的限制。但是DrawNode不会擦除上一帧留下的图形，所以我们需要一个全局指针，手动刷新。
下面是使用代码：
OK，经过这样的处理，总算达到了要求，线的宽度是可以随意调整的。
让我们看看超级粗的线！！
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