private MapObject SelectionTest(Viewport2D viewport, ViewportEvent e)
{
// Create a box to represent the click, with a tolerance level
var unused = viewport.GetUnusedCoordinate(new Coordinate(100000, 100000, 100000));
var tolerance = 4 / viewport.Zoom; // Selection tolerance of four pixels
var used = viewport.Expand(new Coordinate(tolerance, tolerance, 0));
var add = used + unused;
var click = viewport.Expand(viewport.ScreenToWorld(e.X, viewport.Height - e.Y));
var box = new Box(click - add, click + add);
var centerHandles = Sledge.Settings.Select.DrawCenterHandles;
var centerOnly = Sledge.Settings.Select.ClickSelectByCenterHandlesOnly;
// Get the first element that intersects with the box, selecting or deselecting as needed
return Document.Map.WorldSpawn.GetAllNodesIntersecting2DLineTest(box, centerHandles, centerOnly).FirstOrDefault();
}
private Tuple<Coordinate, Coordinate> SnapBoxCoordinatesIfNeeded(Viewport2D viewport, Coordinate start, Coordinate end)
{
if (State.Action == BoxAction.Resizing && State.Handle == ResizeHandle.Center)
{
// Pick the corner to snap
var ms = State.MoveStart;
var pts = viewport.Flatten(State.PreTransformBoxStart);
var pte = viewport.Flatten(State.PreTransformBoxEnd);
var ss = SnapIfNeeded(start);
var se = SnapIfNeeded(end);
var middle = (pts + pte) / 2;
var delta = ss - start;
if (ms.Y > middle.Y)
{
// Top
delta.Y = se.Y - end.Y;
}
if (ms.X > middle.X)
{
// Right
delta.X = se.X - end.X;
}
start += delta;
end += delta;
}
var cstart = viewport.Expand(start) + viewport.GetUnusedCoordinate(State.BoxStart);
var cend = viewport.Expand(end) + viewport.GetUnusedCoordinate(State.BoxEnd);
return Tuple.Create(cstart, cend);
}
private static Coordinate GetOriginForTransform(Viewport2D viewport, BaseBoxTool.BoxState state)
{
decimal x = 0;
decimal y = 0;
var cstart = viewport.Flatten(state.PreTransformBoxStart);
var cend = viewport.Flatten(state.PreTransformBoxEnd);
switch (state.Handle)
{
case BaseBoxTool.ResizeHandle.TopLeft:
case BaseBoxTool.ResizeHandle.Top:
case BaseBoxTool.ResizeHandle.TopRight:
case BaseBoxTool.ResizeHandle.Left:
case BaseBoxTool.ResizeHandle.Right:
y = cstart.Y;
break;
case BaseBoxTool.ResizeHandle.BottomLeft:
case BaseBoxTool.ResizeHandle.Bottom:
case BaseBoxTool.ResizeHandle.BottomRight:
y = cend.Y;
break;
}
switch (state.Handle)
{
case BaseBoxTool.ResizeHandle.Top:
case BaseBoxTool.ResizeHandle.TopRight:
case BaseBoxTool.ResizeHandle.Right:
case BaseBoxTool.ResizeHandle.BottomRight:
case BaseBoxTool.ResizeHandle.Bottom:
x = cstart.X;
break;
case BaseBoxTool.ResizeHandle.TopLeft:
case BaseBoxTool.ResizeHandle.Left:
case BaseBoxTool.ResizeHandle.BottomLeft:
x = cend.X;
break;
}
return viewport.Expand(new Coordinate(x, y, 0));
}
protected virtual void LeftMouseDownToDraw(Viewport2D viewport, ViewportEvent e)
{
State.ActiveViewport = viewport;
State.Action = BoxAction.DownToDraw;
State.BoxStart = SnapIfNeeded(viewport.Expand(viewport.ScreenToWorld(e.X, viewport.Height - e.Y)));
State.BoxEnd = State.BoxStart;
State.Handle = ResizeHandle.BottomLeft;
OnBoxChanged();
}
protected Tuple<Coordinate, Coordinate> GetResizedBoxCoordinates(Viewport2D viewport, ViewportEvent e)
{
if (State.Action != BoxAction.Resizing && State.Action != BoxAction.Drawing) return Tuple.Create(State.BoxStart, State.BoxEnd);
var now = SnapIfNeeded(viewport.ScreenToWorld(e.X, viewport.Height - e.Y));
var cstart = viewport.Flatten(State.BoxStart);
var cend = viewport.Flatten(State.BoxEnd);
// Proportional scaling
var ostart = viewport.Flatten(State.PreTransformBoxStart ?? Coordinate.Zero);
var oend = viewport.Flatten(State.PreTransformBoxEnd ?? Coordinate.Zero);
var owidth = oend.X - ostart.X;
var oheight = oend.Y - ostart.Y;
var proportional = KeyboardState.Ctrl && State.Action == BoxAction.Resizing && owidth != 0 && oheight != 0;
switch (State.Handle)
{
case ResizeHandle.TopLeft:
cstart.X = now.X;
cend.Y = now.Y;
break;
case ResizeHandle.Top:
cend.Y = now.Y;
break;
case ResizeHandle.TopRight:
cend.X = now.X;
cend.Y = now.Y;
break;
case ResizeHandle.Left:
cstart.X = now.X;
break;
case ResizeHandle.Center:
var cdiff = cend - cstart;
var distance = GetResizeDistance(viewport, e);
if (distance == null) cstart = viewport.Flatten(State.PreTransformBoxStart) + now - SnapIfNeeded(State.MoveStart);
else cstart = viewport.Flatten(State.PreTransformBoxStart) + distance;
cend = cstart + cdiff;
break;
case ResizeHandle.Right:
cend.X = now.X;
break;
case ResizeHandle.BottomLeft:
cstart.X = now.X;
cstart.Y = now.Y;
break;
case ResizeHandle.Bottom:
cstart.Y = now.Y;
break;
case ResizeHandle.BottomRight:
cend.X = now.X;
cstart.Y = now.Y;
break;
default:
throw new ArgumentOutOfRangeException();
}
if (proportional)
{
var nwidth = cend.X - cstart.X;
var nheight = cend.Y - cstart.Y;
var mult = Math.Max(nwidth / owidth, nheight / oheight);
var pwidth = owidth * mult;
var pheight = oheight * mult;
var wdiff = pwidth - nwidth;
var hdiff = pheight - nheight;
switch (State.Handle)
{
case ResizeHandle.TopLeft:
cstart.X -= wdiff;
cend.Y += hdiff;
break;
case ResizeHandle.TopRight:
cend.X += wdiff;
cend.Y += hdiff;
break;
case ResizeHandle.BottomLeft:
cstart.X -= wdiff;
cstart.Y -= hdiff;
break;
case ResizeHandle.BottomRight:
cend.X += wdiff;
cstart.Y -= hdiff;
break;
}
}
cstart = viewport.Expand(cstart) + viewport.GetUnusedCoordinate(State.BoxStart);
cend = viewport.Expand(cend) + viewport.GetUnusedCoordinate(State.BoxEnd);
return Tuple.Create(cstart, cend);
}