public static Coord Extend(this Radius r, Coord center, Coord middle, int radiusLength, bool surpassEdges, int width, int height)
{
if (!surpassEdges && (center.X < 0 || center.X >= width || center.Y < 0 || center.Y > height ||
middle.X < 0 || middle.X >= width || middle.Y < 0 || middle.Y > height))
{
return(Coord.Get(0, 0));
}
if (radiusLength < 1)
{
return(center);
}
double theta = Math.Atan2(middle.Y - center.Y, middle.X - center.X),
cosTheta = Math.Cos(theta), sinTheta = Math.Sin(theta);
Coord end = Coord.Get(middle.X, middle.Y);
switch (r)
{
case SquidGrid.Radius.Square:
case SquidGrid.Radius.Cube:
case SquidGrid.Radius.Diamond:
case SquidGrid.Radius.Octahedron: {
int rad2 = 0;
if (surpassEdges)
{
while (Radius(r, center.X, center.Y, end.X, end.Y) < radiusLength)
{
rad2++;
end = Coord.Get(Convert.ToInt32(cosTheta * rad2) + center.X
, Convert.ToInt32(sinTheta * rad2) + center.Y);
}
}
else
{
while (Radius(r, center.X, center.Y, end.X, end.Y) < radiusLength)
{
rad2++;
end = Coord.Get(Clamp(Convert.ToInt32(cosTheta * rad2) + center.X, 0, width)
, Clamp(Convert.ToInt32(sinTheta * rad2) + center.Y, 0, height));
if (end.X == 0 || end.X == width - 1 || end.Y == 0 || end.Y == height - 1)
{
return(end);
}
}
}
return(end);
}
default: {
end = Coord.Get(Clamp(Convert.ToInt32(cosTheta * radiusLength) + center.X, 0, width)
, Clamp(Convert.ToInt32(sinTheta * radiusLength) + center.Y, 0, height));
if (!surpassEdges)
{
long edgeLength = 0;
// if (end.x == 0 || end.x == width - 1 || end.y == 0 || end.y == height - 1)
if (end.X < 0)
{
// wow, we lucked out here. the only situation where cos(angle) is 0 is if the angle aims
// straight up or down, and then x cannot be < 0 or >= width.
edgeLength = Convert.ToInt32((0 - center.X) / cosTheta);
end = end.ChangeY(Clamp(Convert.ToInt32(sinTheta * edgeLength) + center.Y, 0, height));
}
else if (end.X >= width)
{
// wow, we lucked out here. the only situation where cos(angle) is 0 is if the angle aims
// straight up or down, and then x cannot be < 0 or >= width.
edgeLength = Convert.ToInt32((width - 1 - center.X) / cosTheta);
end = end.ChangeY(Clamp(Convert.ToInt32(sinTheta * edgeLength) + center.Y, 0, height));
}
if (end.Y < 0)
{
// wow, we lucked out here. the only situation where sin(angle) is 0 is if the angle aims
// straight left or right, and then y cannot be < 0 or >= height.
edgeLength = Convert.ToInt32((0 - center.Y) / sinTheta);
end = end.ChangeX(Clamp(Convert.ToInt32(cosTheta * edgeLength) + center.X, 0, width));
}
else if (end.Y >= height)
{
// wow, we lucked out here. the only situation where sin(angle) is 0 is if the angle aims
// straight left or right, and then y cannot be < 0 or >= height.
edgeLength = Convert.ToInt32((height - 1 - center.Y) / sinTheta);
end = end.ChangeX(Clamp(Convert.ToInt32(cosTheta * edgeLength) + center.X, 0, width));
}
}
return(end);
}
}
}
