void BitmapUpdate(Size CurrentSize)
{
// release graphics
if (ForeGroundImageGraphics != null)
{
ForeGroundImageGraphics.Dispose();
}
if (BackGroundImageGraphics != null)
{
BackGroundImageGraphics.Dispose();
}
// release bitmaps
if (ForeGroundImageBitmap != null)
{
ForeGroundImageBitmap.Dispose();
}
if (BackGroundImageBitmap != null)
{
BackGroundImageBitmap.Dispose();
}
// allocate new bitmap
if (CurrentSize.Width > 0 && CurrentSize.Height > 0)
{
ForeGroundImageBitmap = new Bitmap(CurrentSize.Width, CurrentSize.Height);
BackGroundImageBitmap = new Bitmap(CurrentSize.Width, CurrentSize.Height);
}
else
{
ForeGroundImageBitmap = new Bitmap(1, 1);
BackGroundImageBitmap = new Bitmap(1, 1);
}
// create new graphics
ForeGroundImageGraphics = Graphics.FromImage(ForeGroundImageBitmap);
BackGroundImageGraphics = Graphics.FromImage(BackGroundImageBitmap);
}
void DisplayZoomBox(int nX)
{
Int64 Low = -1;
Int64 High = -1;
int SampleCount = -1;
DetermineNewFrequencyRange(nX, ref Low, ref High, ref SampleCount);
int X1 = GraphConfig.GetXFromFrequency(Low);
int X2 = GraphConfig.GetXFromFrequency(High);
if (X1 < GraphConfig.LeftBorder)
{
X1 = GraphConfig.LeftBorder;
}
if (X2 > Size.Width - GraphConfig.RightBorder)
{
X2 = Size.Width - GraphConfig.RightBorder;
}
int nWidh = X2 - X1;
ForeGroundImageGraphics.Clear(Color.Transparent);
Brush brush = new SolidBrush(Color.FromArgb(50, 255, 0, 0));
//Brush brushText = new SolidBrush(Color.FromArgb(50, 255, 0, 0));
ForeGroundImageGraphics.FillRectangle(brush, X1, GraphConfig.UpBorder, nWidh, Size.Height - GraphConfig.LowBorder - GraphConfig.UpBorder);
//ForeGroundImageGraphics.DrawString("F1 & F2 to ajust size", new Font("Arial", 10), brushText, new PointF(X1, Size.Height - GraphConfig.LowBorder));
//ForeGroundImageGraphics.
Image = ForeGroundImageBitmap;
}
public void SpectrumPictureBox_MouseLeave(object sender, EventArgs e)
{
ForeGroundImageGraphics.Clear(Color.Transparent);
Image = ForeGroundImageBitmap;
}