private ArraySpec.Cell GetCellAtPixel(int pixelX, int pixelY)
{
// find click texture coords
int x, y;
if (!GetTexCoord(pixelX, pixelY, out x, out y)) return null;
Color color = pixels[x, y];
if (ColorUtils.IsGrayscale(color)) return null;
// flood fill
int w = Array.LayoutTexture.Width, h = Array.LayoutTexture.Height;
HashSet<Pair<int>> ffS = new HashSet<Pair<int>>();
Queue<Pair<int>> ffQ = new Queue<Pair<int>>();
ffQ.Enqueue(new Pair<int>(x, y));
while (ffQ.Count > 0) {
Pair<int> xy = ffQ.Dequeue();
// skip if redundant
if (ffS.Contains(xy)) continue;
ffS.Add(xy);
// enqueue the neighbors
for (int x2 = xy.First - 1; x2 <= xy.First + 1; x2++) {
for (int y2 = xy.Second - 1; y2 <= xy.Second + 1; y2++) {
if (x2 <= 0 || x2 >= w || y2 <= 0 || y2 >= h) continue;
if (pixels[x2, y2] != color) continue;
ffQ.Enqueue(new Pair<int>(x2, y2));
}
}
}
// create the new cell
ArraySpec.Cell newCell = new ArraySpec.Cell();
newCell.Color = color;
newCell.Pixels.AddRange(ffS);
newCell.Pixels.Sort(new Comparison<Pair<int>>((a, b) => {
if (a.Second < b.Second) return -1; // scan line order
if (a.Second > b.Second) return 1;
if (a.First < b.First) return -1;
if (a.First > b.First) return 1;
return 0;
}));
return newCell;
}
protected override void OnMouseMove(MouseEventArgs e)
{
RecomputeArrayViewModel();
if (EditBypassDiodes) {
mouseoverJunction = GetJunctionIxAtPixel(e.X, e.Y);
mouseoverCell = null;
} else {
mouseoverCell = GetCellAtPixel(e.X, e.Y);
mouseoverJunction = -1;
}
if (mouseoverJunction == -1 && mouseoverCell == null) {
this.Cursor = Cursors.Arrow; // not clickable
} else {
this.Cursor = Cursors.Hand;
}
}