private void FormMain_Load(object sender, EventArgs e)
{
Image3D image;
//string testPath = @"MANIX\CER-CT\ANGIO CT";
//string testPath = @"BRAINIX\SOUS - 702";
//string testPath = @"BRAINIX\T2W-FE-EPI - 501";
string testPath = @"vtkBrain";
double min, max;
using (var reader = new DicomReader(TestData.GetPath(testPath)))
{
image = reader.ReadImage3D();
min = reader.MinValue;
max = reader.MaxValue;
}
display = new DisplayImage(image.LengthX, image.LengthY);
var tf = new TransferFunction1D();
tf.Add(0, Color.Black);
tf.Add(max * 0.2, Color.Blue);
tf.Add(max * 0.6, Color.Red);
tf.Add(max, Color.Yellow);
renderer = new TransferFunctionRenderer(image, display, tf);
scrollBarSlice.Maximum = image.LengthZ - 1;
pictureBoxDisplay.Image = display.GetBitmap();
Render();
}
protected override void OnValidate(Image3D image)
{
base.OnValidate(image);
tf = tfBuilder.CreateTransferFunction();
}
public TransferFunction1D CreateTransferFunction()
{
var tf = new TransferFunction1D();
var sortedItems = from i in Items orderby i.Value select i;
foreach (var item in sortedItems)
{
tf.Add(item.Value, item.Color);
}
return tf;
}
protected override void OnValidate(Image3D image)
{
if (image.LengthZ != 1) { throw new LogException("can only render Images with exactly one slice"); }
tf = tfBuilder.CreateTransferFunction();
}
public void Render(DisplayImage display, TransferFunction1D tf)
{
// find max value
int histogramMax = 0;
int histogramMax2 = 0;
int histogramSum = 0;
for (int i = 0; i < histogramValues.Length; i++)
{
var v = histogramValues[i];
if (v > histogramMax)
{
histogramMax2 = histogramMax;
histogramMax = v;
}
if (v > histogramMax2 && v < histogramMax)
{
histogramMax2 = v;
}
histogramSum += v;
}
int histogramHeight = histogramSum * 4 / Count; // TODO: find a suitable height function
if (histogramHeight == 0) { histogramHeight = 1; } // avoid division by 0 error
// draw histogram values
int displayHeight = display.Height;
int displayWidth = display.Width;
double delta = (Maximum - Minimum) / Count;
for (int x = 0; x < displayWidth; x++)
{
int histogramIndexStart = (x * Count) / (displayWidth);
int histogramIndexEnd = ((x + 1) * Count) / (displayWidth);
int sum = 0;
for (int i = histogramIndexStart; i < histogramIndexEnd; i++)
{
sum += histogramValues[i];
}
int barHeight = Math.Min(displayHeight, (sum * displayHeight) / histogramHeight);
Color tfColor = tf.GetColor(Minimum + delta * x);
for (int y = 0; y < 3; y++)
{
display.SetPixel(x, y, tfColor);
}
for (int y = 3; y < (displayHeight - barHeight); y++)
{
if (y >= display.Height) { break; }
display.SetPixel(x, y, Colors.Transparent);
}
for (int y = (displayHeight - barHeight); y < displayHeight; y++)
{
if (y >= display.Height) { break; }
display.SetPixel(x, y, tfColor);
}
}
}
