/// <summary>
/// When the mouse is hovering over the box, do collision tests against the handles and change the cursor if needed.
/// </summary>
/// <param name="viewport">The viewport</param>
/// <param name="e">The mouse event</param>
protected override void MouseHoverWhenDrawn(Viewport2D viewport, ViewportEvent e)
{
if (_currentTool == null)
{
base.MouseHoverWhenDrawn(viewport, e);
return;
}
var padding = 7 / viewport.Zoom;
viewport.Cursor = Cursors.Default;
State.Action = BoxAction.Drawn;
State.ActiveViewport = null;
var now = viewport.ScreenToWorld(e.X, viewport.Height - e.Y);
var start = viewport.Flatten(State.BoxStart);
var end = viewport.Flatten(State.BoxEnd);
var ccs = new Coordinate(Math.Min(start.X, end.X), Math.Min(start.Y, end.Y), 0);
var cce = new Coordinate(Math.Max(start.X, end.X), Math.Max(start.Y, end.Y), 0);
// Check center handle
if (now.X > ccs.X && now.X < cce.X && now.Y > ccs.Y && now.Y < cce.Y)
{
State.Handle = ResizeHandle.Center;
State.ActiveViewport = viewport;
State.Action = BoxAction.ReadyToResize;
viewport.Cursor = CursorForHandle(State.Handle);
return;
}
// Check other handles
foreach (var handle in _currentTool.GetHandles(start, end, viewport.Zoom).Where(x => _currentTool.FilterHandle(x.Item1)))
{
var x = handle.Item2;
var y = handle.Item3;
if (now.X < x - padding || now.X > x + padding || now.Y < y - padding || now.Y > y + padding)
{
continue;
}
State.Handle = handle.Item1;
State.ActiveViewport = viewport;
State.Action = BoxAction.ReadyToResize;
viewport.Cursor = CursorForHandle(State.Handle);
return;
}
}
private void RenderHandles(Viewport2D viewport, Coordinate start, Coordinate end)
{
if (_currentTool == null)
{
return;
}
var circles = _currentTool.RenderCircleHandles;
// Get the filtered list of handles, and convert them to vector locations
var z = (double)viewport.Zoom;
var handles = _currentTool.GetHandles(start, end, viewport.Zoom)
.Where(x => _currentTool.FilterHandle(x.Item1))
.Select(x => new Vector2d((double)x.Item2, (double)x.Item3))
.ToList();
// Draw the insides of the handles in white
GL.Color3(Color.White);
foreach (var handle in handles)
{
GL.Begin(BeginMode.Polygon);
if (circles)
{
GLX.Circle(handle, 4, z, loop: true);
}
else
{
GLX.Square(handle, 4, z, true);
}
GL.End();
}
// Draw the borders of the handles in black
GL.Color3(Color.Black);
GL.Begin(BeginMode.Lines);
foreach (var handle in handles)
{
if (circles)
{
GLX.Circle(handle, 4, z);
}
else
{
GLX.Square(handle, 4, z);
}
}
GL.End();
}