基于DirectDraw的分形演示程序，实现了 SierGasket, Tree, Koch, Cayley, Cantor, Mandelbrot, Sierpinski, TriWingEagle（三翅鹰）的显示。-based DirectDraw Fractal demo program, achieving SierGasket. Tree, Koch, Cayley, Cantor, Mandelbrot. Sierpinski, TriWingEagle (3-winged ha