// Does one pass of arranging the images into clusters. Returns the longest cluster.
private double arrangeHelper(int start, int end, double aveWidth, double unitLength)
{
// The space one image should take in terms of year count.
double interval_width = Math.Ceiling(aveWidth / unitLength);
// Dividee the overall space into small parts based on the year and keep track of the availability of the spaces.
Dictionary<int, ImageCluster> space = new Dictionary<int, ImageCluster>();
ImageCluster prevCluster = null;
double rightPos = 1;
foreach (ImageData img in _displayedCollection)
{
// The index of the chunk of timeline space that contains the year of this image.
int index = (int)((img.year - start) / interval_width);
ImageCluster cluster = null;
if (!space.ContainsKey(index))
{
Boolean collide = false;
// Check if the new cluster would collide with the previous cluster. If so, add to the previous cluster instead.
if (prevCluster != null)
{
if (index * aveWidth <= Canvas.GetLeft(prevCluster) + prevCluster.longestRowWidth())
{
collide = true;
cluster = prevCluster;
}
}
// Add a new cluster.
if (!collide)
{
cluster = new ImageCluster(ROWS);
space.Add(index, cluster);
MainCanvas.Children.Add(cluster);
Canvas.SetLeft(cluster, index * aveWidth);
}
}
else
{
cluster = space[index];
}
cluster.addImage(img);
prevCluster = cluster;
// Center the cluster by shifting it left by half the width.
//Canvas.SetLeft(cluster, Canvas.GetLeft(cluster) - cluster.longestRowWidth() / 2.0);
//keep track of rightmost point to appropriately scale maincanvas
rightPos = Canvas.GetLeft(cluster) + cluster.longestRowWidth();
}
MainCanvas.Width = rightPos;
mainScatterViewItem.Width = MainCanvas.Width + _windowSize.Width;
double marginX = (mainScatterViewItem.Width - MainCanvas.Width) / 2;
double marginY = (mainScatterViewItem.Height - MainCanvas.Height) / 2;
MainCanvas.Margin = new Thickness(marginX, marginY, marginX, marginY);
ImageCluster longest_cluster = null;
// Find the longest cluster.
foreach (ImageCluster ic in space.Values)
{
if (longest_cluster == null ||
longest_cluster.longestRowWidth() < ic.longestRowWidth())
{
longest_cluster = ic;
}
}
int diff = longest_cluster.maxYear - longest_cluster.minYear;
diff = (diff == 0) ? 1 : diff;
return (double)longest_cluster.getSize() / ((double)ROWS) * aveWidth / ((double) diff);
}
public void setCluster(ImageCluster c)
{
_cluster = c;
}
