实现扩散的计算（菲克定律）与可视化（OpenGL）。按上箭头可调到下一时刻。鼠标右键拖动。鼠标左键调整显示方式-Computing to achieve diffusion (Fick' s law) and visualization (OpenGL). Press the arrow to the next moment. The right mouse button and drag. The left mouse button to adjust the display mode