SndView.py 文件源码

def create_background(self):
        w,h = self.GetSize()
        self.background_bitmap = wx.EmptyBitmap(w, h)
        dc = wx.MemoryDC(self.background_bitmap)
        gc = wx.GraphicsContext_Create(dc)
        dc.SetBrush(wx.Brush("#FFFFFF"))
        dc.Clear()
        dc.DrawRectangle(0,0,w,h)

        off = h // self.chnls // 2
        gc.SetPen(wx.Pen('#000000', width=1, style=wx.SOLID))
        gc.SetBrush(wx.Brush("#FFFFFF", style=wx.TRANSPARENT))
        dc.SetTextForeground("#444444")
        if sys.platform in "darwin":
            font, ptsize = dc.GetFont(), dc.GetFont().GetPointSize()
            font.SetPointSize(ptsize - 3)
            dc.SetFont(font)
        else:
            font = dc.GetFont()
            font.SetPointSize(8)
            dc.SetFont(font)
        tickstep = w // 10
        if tickstep < 40:
            timelabel = "%.1f"
        elif tickstep < 80:
            timelabel = "%.2f"
        elif tickstep < 120:
            timelabel = "%.3f"
        else:
            timelabel = "%.4f"
        timestep = (self.end - self.begin) * 0.1
        for i, samples in enumerate(self.img):
            y = h // self.chnls * i
            if len(samples):
                gc.DrawLines(samples)
            dc.SetPen(wx.Pen('#888888', width=1, style=wx.DOT))
            dc.DrawLine(0, y+off, w, y+off)
#            for j in range(10):
#                dc.SetPen(wx.Pen('#888888', width=1, style=wx.DOT))
#                dc.DrawLine(j*tickstep, 0, j*tickstep, h)
#                dc.DrawText(timelabel % (self.begin+j*timestep), j*tickstep+2, h-y-12)
            dc.SetPen(wx.Pen('#000000', width=1))
            dc.DrawLine(0, h-y, w, h-y)

        dc.SelectObject(wx.NullBitmap)