// Copies a MandImage object AND its bitmap from the source to this object.
public void CopyFrom(MandImage sourceMandelbrotImage)
{
if (ReferenceEquals(this, sourceMandelbrotImage))
{
// Don't bother copying because we're trying to copy the same object.
return;
}
MandRect.CopyFrom(sourceMandelbrotImage.MandRect);
// Copy bitmap.
if (MainBmp.Size != sourceMandelbrotImage.MainBmp.Size)
{
throw (new Exception("Bitmap sizes do not match hence can't be copied in MandImage.CopyFrom()"));
}
else
{
using (Graphics g = Graphics.FromImage(MainBmp))
{
g.DrawImage(sourceMandelbrotImage.MainBmp, 0, 0);
}
}
m_bitmapCalculated = sourceMandelbrotImage.m_bitmapCalculated;
formToUpdate = sourceMandelbrotImage.formToUpdate;
XInc = sourceMandelbrotImage.XInc;
YInc = sourceMandelbrotImage.YInc;
bitmapSectionCalcFinishedDelegate = sourceMandelbrotImage.bitmapSectionCalcFinishedDelegate;
bitmapCalcFinishedDelegate = sourceMandelbrotImage.bitmapCalcFinishedDelegate;
}
/// <summary>
/// Activates a series of threads up to maxThreads, each of which will calculate the points in successive sections of the image, defined by a start and stop row in threadInfo and
/// Form1.mandRect.X, mandRect.Right, mandRect.Y, mandRect.Bottom, xInc and yInc which define the mandelbrot value range that maps to the overall bitmap to be generated.
///
/// Checks that noRowsCalcd is 0 and if it’s not, issue error msg that we tried to recalc whilst a recalc was already underway and return.
/// If it is zero, for 0 to maxThreads – 1, call AddImageCalcThread for the relevant threadInfo element.
///
/// </summary>
public void CalcMandelbrotImage(BitmapSectionCalcFinishedDelegate myBitmapSectionCalcFinishedDelegate, BitmapCalcFinishedDelegate myBitmapCalcFinishedDelegate)
{
// Update the delegate that should be called to notify when each bitmap section is finished so the form can render this section.
bitmapSectionCalcFinishedDelegate = myBitmapSectionCalcFinishedDelegate;
// Update the delegate that should be called to notify when the entire bitmap is finished calculating.
bitmapCalcFinishedDelegate = myBitmapCalcFinishedDelegate;
// Queue the task.
// threadsActive = true;
// ThreadInfo ti = new ThreadInfo();
// ti.bmp = (Bitmap)MainBmp.Clone();
// tiArrayList.Add(ti);
// ThreadPool.QueueUserWorkItem(new WaitCallback(createMandlebrotImage), ti);
if (numberActiveBackGroundThreads != 0)
{
MessageBox.Show("Error - cannot complete calculations as " + numberActiveBackGroundThreads + " caculcation threads already underway.", "Calculation Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
// Grab lock to make sure that no other thread updates the imageCalcInProgress etc.
lock (_locker)
{
imageCalcInProgress = true;
// Divide number of rows of bitmap to calc into chunks of rowsToCalcPerThread
for (int threadNum = 0; threadNum < maxThreads; threadNum++)
{
if (threadInfoArray[threadNum].bwThread.IsBusy)
{
// This thread is not available
throw new Exception("ERROR - numberActiveBackGroundThreads = 0 but thread " + threadNum + " is active.");
}
else
{
// Thread is available so set it up and start it.
ThreadInfo ti = threadInfoArray[threadNum];
ti.fullMandImage = this;
SetAndActivateThreadToCalcNextImageSection(ti);
}
}
}
}