In order to facilitate the management and manifestations of the layersa,nd make the code used repeatedly,a muti-layer manifestation component which is managed and showed by a VCL component is designed. This component is the TJCADImage.

• 为了方便图层的管理和显示,以及提高代码的可重用性,设计了一个VCL组件来管理和显示图层的多层显示组件,这个组件就是TJCADImage。