private void ScaleLine(LineFigure lf, Point pos)
{
if (_nowScaling == null)
{
_originalX = lf.X.CachedValue.AsDouble;
_originalY = lf.Y.CachedValue.AsDouble;
_originalW = lf.Width.CachedValue.AsDouble;
_originalH = lf.Height.CachedValue.AsDouble;
var snappedTo = StepManager.SnapTo(pos, lf.GetMagnets(), lf.Center);
var bLenSquared = _originalW * _originalW + _originalH * _originalH;
if ((snappedTo == lf.Start) && (Math.Abs(bLenSquared) > Utils.Tolerance))
{
var ax = _originalX + _originalW - pos.X;
var ay = _originalY + _originalH - pos.Y;
_nowScaling = new ScaleLineStep(lf, ScaleLineStep.Side.End,
(ax * _originalW + ay * _originalH) / bLenSquared);
}
else if ((snappedTo == lf.End) && (Math.Abs(bLenSquared) > Utils.Tolerance))
{
var ax = pos.X - _originalX;
var ay = pos.Y - _originalY;
_nowScaling = new ScaleLineStep(lf, ScaleLineStep.Side.Start,
(ax * _originalW + ay * _originalH) / bLenSquared);
}
if (_nowScaling == null)
{
return;
}
StepManager.InsertNext(_nowScaling);
}
else
{
var sls = (ScaleLineStep)_nowScaling;
if (sls.ScaleAround == ScaleLineStep.Side.Start)
{
var bLenSquared = _originalW * _originalW + _originalH * _originalH;
var ax = pos.X - _originalX;
var ay = pos.Y - _originalY;
sls.Scale((ax * _originalW + ay * _originalH) / bLenSquared);
}
else if (sls.ScaleAround == ScaleLineStep.Side.End)
{
var bLenSquared = _originalW * _originalW + _originalH * _originalH;
var ax = _originalX + _originalW - pos.X;
var ay = _originalY + _originalH - pos.Y;
sls.Scale((ax * _originalW + ay * _originalH) / bLenSquared);
}
}
}
private void RotateLine(LineFigure lf, Point pos)
{
if (_nowRotating == null)
{
var snappedTo = StepManager.SnapTo(pos, lf.GetMagnets(), lf.Center);
if (snappedTo == lf.Start)
{
var angle = Utils.AngleBetween(lf.X.CachedValue.AsDouble + lf.Width.CachedValue.AsDouble - pos.X,
lf.Y.CachedValue.AsDouble + lf.Height.CachedValue.AsDouble - pos.Y,
lf.Width.CachedValue.AsDouble,
lf.Height.CachedValue.AsDouble);
_nowRotating = new RotateLineStep(lf, RotateLineStep.Side.End,
angle / (2 * Math.PI));
}
else if (snappedTo == lf.End)
{
var angle = Utils.AngleBetween(pos.X - lf.X.CachedValue.AsDouble, pos.Y - lf.Y.CachedValue.AsDouble,
lf.Width.CachedValue.AsDouble, lf.Height.CachedValue.AsDouble);
_nowRotating = new RotateLineStep(lf, RotateLineStep.Side.Start,
angle / (2 * Math.PI));
}
if (_nowRotating == null)
{
return;
}
_originalX = lf.X.CachedValue.AsDouble;
_originalY = lf.Y.CachedValue.AsDouble;
_originalW = lf.Width.CachedValue.AsDouble;
_originalH = lf.Height.CachedValue.AsDouble;
StepManager.InsertNext(_nowRotating);
}
else
{
var rls = (RotateLineStep)_nowRotating;
if (rls.RotateAround == RotateLineStep.Side.Start)
{
var angle = Utils.AngleBetween(pos.X - _originalX, pos.Y - _originalY,
_originalW, _originalH);
rls.Rotate(angle / (2 * Math.PI));
}
else if (rls.RotateAround == RotateLineStep.Side.End)
{
var angle = Utils.AngleBetween(_originalX + _originalW - pos.X,
_originalY + _originalH - pos.Y,
_originalW, _originalH);
rls.Rotate(angle / (2 * Math.PI));
}
}
}
private void ResizeLine(LineFigure lf, Point pos)
{
if (_nowResizing == null)
{
var snappedTo = StepManager.SnapTo(pos, lf.GetMagnets(), lf.Center);
if (snappedTo == lf.Start)
{
_nowResizing = new ResizeLineStep(lf, ResizeLineStep.Side.End, pos.X - _downPos.X,
pos.Y - _downPos.Y);
}
else if (snappedTo == lf.End)
{
_nowResizing = new ResizeLineStep(lf, ResizeLineStep.Side.Start, pos.X - _downPos.X,
pos.Y - _downPos.Y);
}
if (_nowResizing == null)
{
return;
}
StepManager.InsertNext(_nowResizing);
}
else
{
var rls = (ResizeLineStep)_nowResizing;
var snapped = StepManager.Snap(pos, _nowResizing.Figure);
if (snapped != null)
{
if (rls.ResizeAround == ResizeLineStep.Side.End)
{
rls.Resize("(" + snapped.X.ExprString + ") - " + rls.Figure.Name + ".x",
"(" + snapped.Y.ExprString + ") - " + rls.Figure.Name + ".y", snapped.Def);
}
else if (rls.ResizeAround == ResizeLineStep.Side.Start)
{
rls.Resize("(" + snapped.X.ExprString + ") - (" + rls.Figure.Name + ".x + (" +
rls.Figure.Name + ".width))",
"(" + snapped.Y.ExprString + ") - (" + rls.Figure.Name + ".y + (" +
rls.Figure.Name + ".height))", snapped.Def);
}
}
else
{
if (rls.ResizeAround == ResizeLineStep.Side.End)
{
rls.Resize(pos.X - _downPos.X, pos.Y - _downPos.Y);
}
else if (rls.ResizeAround == ResizeLineStep.Side.Start)
{
rls.Resize(pos.X - _downPos.X, pos.Y - _downPos.Y);
}
}
}
}