For i = 0 To PicMain.Height MaskLine = False 初始化MaskLine变量 For j = 0 To PicMain.Width CurrentColor = GetPixel(PicMain.hdc, j, i) 取得当前所在点的颜色值 If j < PicMain.Width Then TwoColor = GetPixel(PicMain.hdc, j + 1, i) 取得当前所在点前面一点的值, 用途是当是一条很宽的线条