public static IEnumerable <CellInfo> Plan(ScreenInfo screenInfo)
{
var w = screenInfo.Size.X;
var h = screenInfo.Size.Y;
var screen = Extent.Create(0, 0, w - 1, h - 1);
var extent = screenInfo.Bounds.Aspect(screen.Aspect());
double X(int x) => MathEx.Translate(x, 0, w - 1, extent.S.X, extent.E.X);
double Y(int y) => MathEx.Translate(y, 0, h - 1, extent.S.Y, extent.E.Y);
var i = (int)Math.Sqrt(screen.Area() / extent.Area()) / 4;
return(Partition(screen, 128, 128)
.Select(
e => new CellInfo {
Iterations = i,
Cell = e,
Bounds = Extent.Create(X(e.S.X), Y(e.S.Y), X(e.E.X), Y(e.E.Y))
}));
}
private static IEnumerable <Extent <int> > Partition(Extent <int> screen, int width, int height)
{
var ey = screen.E.Y;
var ex = screen.E.X;
var sy = screen.S.Y;
while (sy < ey)
{
var sx = screen.S.X;
while (sx < ex)
{
yield return(Extent.Create(
sx,
sy,
Math.Min(sx + width - 1, ex),
Math.Min(sy + height - 1, ey)));
sx += width;
}
sy += height;
}
}
public IActionResult GetImage(int i, int w, int h, double sx, double sy, double ex, double ey) => File(Paintbrot.Paint(i, w, h, Extent.Create(sx, sy, ex, ey)), "image/png");
public IActionResult Plan(int w, int h) =>
Json(
Paintbrot.Plan(
new ScreenInfo {
Size = Point.Create(w, h), Bounds = Extent.Create(-2.5, -1, 1, 1)
}));