iOS上的画板应用小程序，可以随意绘画，并且可以用触摸的方式绘制几何图形，有各种颜色可以选择，支持随机。-iOS applet on the drawing board, free painting, and can be plotted with the touch of geometry, a variety of colors to choose from, support random.

各种随机信号的自相关函数和功率谱密度函数、画图-Autocorrelation function and power spectral density function of a variety of random signals, drawing

自己写的一个刮刮乐小游戏，就是随机产生3个目标数字，然后玩家点击扑克牌，如果连续点击三张的数字是目标数字，则“中奖了”。-Himself wrote a small scratch music games, is randomly generated three target number, then click poker players, if click on three consecutive Numbers is the goal, is the "winning".