private void InitializeChildren()
{
// Define honeycomb of 127 hexagons, starting in the center of the canvas.
_rootCell = new HexagonButton(FindResource("HexagonButtonStyle") as Style);
Canvas.SetLeft(_rootCell, canvas1.Width / 2);
Canvas.SetTop(_rootCell, canvas1.Height / 2);
canvas1.Children.Add(_rootCell);
_rootCell.Click += new RoutedEventHandler(cell_Clicked);
// Expand outward (recursive loop).
InitializeChildrenR(_rootCell, 1);
// Apply nominal color gradients.
CascadeChildColors();
}
private void InitializeChildrenR(HexagonButton parent, int generation)
{
if (generation > MaxGenerations) return;
// Create up to 6 surrounding nodes.
for (int i = 0; i < 6; ++i)
{
if (parent.Neighbors[i] == null)
{
HexagonButton cell = new HexagonButton(FindResource("HexagonButtonStyle") as Style);
double dx = Canvas.GetLeft(parent) + HexagonButton.Offset * Math.Cos(i * Math.PI / 3d);
double dy = Canvas.GetTop(parent) + HexagonButton.Offset * Math.Sin(i * Math.PI / 3d);
Canvas.SetLeft(cell, dx);
Canvas.SetTop(cell, dy);
canvas1.Children.Add(cell);
parent.Neighbors[i] = cell;
cell.Click += new RoutedEventHandler(cell_Clicked);
}
}
// Set the cross-pointers on the 6 surrounding nodes.
for (int i = 0; i < 6; ++i)
{
HexagonButton child = parent.Neighbors[i];
if (child != null)
{
int ip3 = (i + 3) % 6;
child.Neighbors[ip3] = parent;
int ip1 = (i + 1) % 6;
int ip2 = (i + 2) % 6;
int im1 = (i + 5) % 6;
int im2 = (i + 4) % 6;
child.Neighbors[ip2] = parent.Neighbors[ip1];
child.Neighbors[im2] = parent.Neighbors[im1];
}
}
// Recurse into each of the 6 surrounding nodes.
for (int i = 0; i < 6; ++i)
{
InitializeChildrenR(parent.Neighbors[i], generation + 1);
}
}
//
// Interface
public HexagonButton(Style style)
{
this.Style = style;
_neighbors = new HexagonButton[6];
_nominalColor = Color.FromScRgb(1f, 1f, 1f, 1f);
}
private void CascadeChildColorsR(HexagonButton parent)
{
float delta = 1f / MaxGenerations;
float ceiling = 0.99f;
System.Collections.Generic.List<HexagonButton> visitedNodes =
new System.Collections.Generic.List<HexagonButton>(6);
for (int i = 0; i < 6; ++i)
{
HexagonButton child = parent.Neighbors[i];
if (child != null && !child.Visited)
{
Color c = parent.NominalColor;
switch (i)
{
case 0: // increase cyan; else reduce red
if (c.ScG < ceiling && c.ScB < ceiling)
{
c.ScG = Math.Min(Math.Max(0f, c.ScG + delta), 1f);
c.ScB = Math.Min(Math.Max(0f, c.ScB + delta), 1f);
}
else
{
c.ScR = Math.Min(Math.Max(0f, c.ScR - delta), 1f);
}
break;
case 1: // increase blue; else reduce yellow
if (c.ScB < ceiling)
{
c.ScB = Math.Min(Math.Max(0f, c.ScB + delta), 1f);
}
else
{
c.ScR = Math.Min(Math.Max(0f, c.ScR - delta), 1f);
c.ScG = Math.Min(Math.Max(0f, c.ScG - delta), 1f);
}
break;
case 2: // increase magenta; else reduce green
if (c.ScR < ceiling && c.ScB < ceiling)
{
c.ScR = Math.Min(Math.Max(0f, c.ScR + delta), 1f);
c.ScB = Math.Min(Math.Max(0f, c.ScB + delta), 1f);
}
else
{
c.ScG = Math.Min(Math.Max(0f, c.ScG - delta), 1f);
}
break;
case 3: // increase red; else reduce cyan
if (c.ScR < ceiling)
{
c.ScR = Math.Min(Math.Max(0f, c.ScR + delta), 1f);
}
else
{
c.ScG = Math.Min(Math.Max(0f, c.ScG - delta), 1f);
c.ScB = Math.Min(Math.Max(0f, c.ScB - delta), 1f);
}
break;
case 4: // increase yellow; else reduce blue
if (c.ScR < ceiling && c.ScG < ceiling)
{
c.ScR = Math.Min(Math.Max(0f, c.ScR + delta), 1f);
c.ScG = Math.Min(Math.Max(0f, c.ScG + delta), 1f);
}
else
{
c.ScB = Math.Min(Math.Max(0f, c.ScB - delta), 1f);
}
break;
case 5: // increase green; else reduce magenta
if (c.ScG < ceiling)
{
c.ScG = Math.Min(Math.Max(0f, c.ScG + delta), 1f);
}
else
{
c.ScR = Math.Min(Math.Max(0f, c.ScR - delta), 1f);
c.ScB = Math.Min(Math.Max(0f, c.ScB - delta), 1f);
}
break;
}
child.NominalColor = c;
child.Visited = true;
visitedNodes.Add(child);
}
}
parent.Visited = true; // ensures root node not over-visited
foreach (HexagonButton child in visitedNodes)
{
CascadeChildColorsR(child);
}
}