java做的一个3D图形，可以任意旋转，只要你在它上按住鼠标左键，就可以绕着一点随便旋转了。-do a 3D graphics, arbitrary rotation, as long as you have it on the left mouse button is pressed, we can casually revolving around a point.

*一个旋转的\"心\"，用Java编写 *3D的，通过计算空间中的点并投影到XY轴绘出，方向键和PU，PD控制旋转方向-a "heart" and using Java 3D *, By calculating space and the point of the projection is likely to draw the XY axis direction keys, and PU, PD control the direction of rotation