我要写一个根据USB收到的资料绘出波形的程式 但是遇到问题是绘出来的波形都会跟预期的不一样 目前测试下来推测是绘图这个动作花的时间太长了 导致在绘第一笔资料的时候第二笔资料已经送过来了而没收到 因为把绘图的程式码Mark掉只看接收的资料是没有错的 而加上绘图的程式码後会出现资料漏收的问题 以下是我绘图的程式码，不知道有没有甚麽写法能加快绘图的速度? g = display_ECG(device).PictureBox_ECG.CreateGraphics g.Clear(display_ECG(device).PictureBox_ECG.BackColor) g.DrawLine(Pens.Red, center_axis, 0, center_axis, h_ECG) lastx = 0 lasty = h_ECG - ECG_array(device, 0) * h_ECG / 255 For i = 1 To DataCap_ECG x = w_ECG * i / (DataCap_ECG + 1) y = h_ECG - ECG_array(device, i) * h_ECG / 255 g.DrawLine(Pens.Yellow, lastx, lasty, x, y) lastx = x lasty = y Next g.Dispose() g = display_ECG(device).PictureBox_Window.CreateGraphics g.Clear(display_ECG(device).PictureBox_Window.BackColor) lastx = 0 lasty = h_window - (ECG_window_buffer(device, 0) - Lbound) * h_window / (Ubound - Lbound) For i = 1 To DataCap_Window x = w_window * i / (DataCap_Window + 1) y = h_window - (ECG_window_buffer(device, i) - Lbound) * h_window / (Ubound - Lbound) g.DrawLine(Pens.Yellow, lastx, lasty, x, y) lastx = x lasty = y Next g.Dispose() P.S : 有搜寻过板上有关"绘图"的文章 似乎都没有我想找的资料 --

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