找到项目libcocos2d->draw_nodes->CCDrawingPrimitives.cpp将
glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) segments+additionalSegment);
改为glDrawArrays(GL_TRIANGLE_FAN, 0, (GLsizei) segments+additionalSegment);就能实现实心圆。
原文：http://www.cnblogs.com/C-Plus-Plus/p/3990928.html