private Box GetRectangle(ICamera camera)
{
var start = camera.Flatten(BoxState.Start);
var end = camera.Flatten(BoxState.End);
var box = new Box(start, end);
var wid = Math.Min(box.Width / 10, camera.PixelsToUnits(20));
var len = Math.Min(box.Length / 10, camera.PixelsToUnits(20));
switch (Handle)
{
case ResizeHandle.TopLeft:
return(new Box(new Vector3(start.X, end.Y - len, 0), new Vector3(start.X + wid, end.Y, 0)));
case ResizeHandle.Top:
return(new Box(new Vector3(start.X, end.Y - len, 0), end));
case ResizeHandle.TopRight:
return(new Box(new Vector3(end.X - wid, end.Y - len, 0), new Vector3(end.X, end.Y, 0)));
case ResizeHandle.Left:
return(new Box(start, new Vector3(start.X + wid, end.Y, 0)));
case ResizeHandle.Center:
return(box);
case ResizeHandle.Right:
return(new Box(new Vector3(end.X - wid, start.Y, 0), end));
case ResizeHandle.BottomLeft:
return(new Box(new Vector3(start.X, start.Y, 0), new Vector3(start.X + wid, start.Y + len, 0)));
case ResizeHandle.Bottom:
return(new Box(start, new Vector3(end.X, start.Y + len, 0)));
case ResizeHandle.BottomRight:
return(new Box(new Vector3(end.X - wid, start.Y, 0), new Vector3(end.X, start.Y + len, 0)));
default:
throw new ArgumentOutOfRangeException();
}
}
private Vector3 GetOriginForTransform(ICamera camera, BoxState state)
{
float x = 0;
float y = 0;
var cstart = camera.Flatten(state.OrigStart);
var cend = camera.Flatten(state.OrigEnd);
switch (Handle)
{
case ResizeHandle.TopLeft:
case ResizeHandle.Top:
case ResizeHandle.TopRight:
case ResizeHandle.Left:
case ResizeHandle.Right:
y = cstart.Y;
break;
case ResizeHandle.BottomLeft:
case ResizeHandle.Bottom:
case ResizeHandle.BottomRight:
y = cend.Y;
break;
}
switch (Handle)
{
case ResizeHandle.Top:
case ResizeHandle.TopRight:
case ResizeHandle.Right:
case ResizeHandle.BottomRight:
case ResizeHandle.Bottom:
x = cstart.X;
break;
case ResizeHandle.TopLeft:
case ResizeHandle.Left:
case ResizeHandle.BottomLeft:
x = cend.X;
break;
}
return(camera.Expand(new Vector3(x, y, 0)));
}
protected (Vector3, Vector3) GetWorldPositionAndScreenOffset(ICamera camera)
{
const int distance = 6;
var start = camera.Flatten(BoxState.Start);
var end = camera.Flatten(BoxState.End);
var mid = (start + end) / 2;
Vector3 center;
Vector3 offset;
switch (Handle)
{
case ResizeHandle.TopLeft:
center = new Vector3(start.X, end.Y, 0);
offset = new Vector3(-distance, -distance, 0);
break;
case ResizeHandle.Top:
center = new Vector3(mid.X, end.Y, 0);
offset = new Vector3(0, -distance, 0);
break;
case ResizeHandle.TopRight:
center = new Vector3(end.X, end.Y, 0);
offset = new Vector3(distance, -distance, 0);
break;
case ResizeHandle.Left:
center = new Vector3(start.X, mid.Y, 0);
offset = new Vector3(-distance, 0, 0);
break;
case ResizeHandle.Center:
center = mid;
offset = Vector3.Zero;
break;
case ResizeHandle.Right:
center = new Vector3(end.X, mid.Y, 0);
offset = new Vector3(distance, 0, 0);
break;
case ResizeHandle.BottomLeft:
center = new Vector3(start.X, start.Y, 0);
offset = new Vector3(-distance, distance, 0);
break;
case ResizeHandle.Bottom:
center = new Vector3(mid.X, start.Y, 0);
offset = new Vector3(0, distance, 0);
break;
case ResizeHandle.BottomRight:
center = new Vector3(end.X, start.Y, 0);
offset = new Vector3(distance, distance, 0);
break;
default:
throw new ArgumentOutOfRangeException();
}
return(camera.Expand(center), offset);
}