public DrawingShape GetShape(CanvasEventArgs a, TikzStyle style)
{
if (click == 0) // first click, draw a straight line
{
if (a.MouseState == MouseState.DOWN)
{
//FIXME: small bug here, sometimes when a user clicks for the first time long line appears for a split second, noticeable but should not influence performance
firstPoint = a.Point;
bezier = new BezierSegment()
{
Point3 = a.Point.GetSystemPoint()
};
figure = new PathFigure();
figure.Segments.Add(bezier);
path = new ArrowPath();
path.SetStyle(style);
path.Margin = ShapeUtils.GetMargin(firstPoint.X, firstPoint.Y);
pf = new PathFigure[] { figure };
path.Data = new PathGeometry(pf);
current = new DrawingShape(
new TikzBezier(path, style),
ShapeState.START
);
}
else if (a.MouseState == MouseState.MOVE)
{
bezier.Point3 = GetPointWithoutMargin(firstPoint, a.Point);
}
else
{
bezier.Point3 = GetPointWithoutMargin(firstPoint, a.Point);
click++;
}
return(current);
}
else if (click == 1) // second click, select first control point
{
if (a.MouseState == MouseState.DOWN)
{
secondPointSelected = true;
bezier.Point1 = GetPointWithoutMargin(firstPoint, a.Point);
}
else if (a.MouseState == MouseState.MOVE)
{
if (secondPointSelected)
{
bezier.Point1 = GetPointWithoutMargin(firstPoint, a.Point);
}
}
else
{
bezier.Point1 = GetPointWithoutMargin(firstPoint, a.Point);
click++;
}
return(current);
}
else if (click == 2) // third click, select second control point
{
if (a.MouseState == MouseState.DOWN)
{
thirdPointSelected = true;
bezier.Point2 = GetPointWithoutMargin(firstPoint, a.Point);
}
else if (a.MouseState == MouseState.MOVE)
{
if (thirdPointSelected)
{
bezier.Point2 = GetPointWithoutMargin(firstPoint, a.Point);
}
}
else
{
bezier.Point2 = GetPointWithoutMargin(firstPoint, a.Point);
current.ShapeState = ShapeState.FINISHED;
click = 0;
secondPointSelected = thirdPointSelected = false;
}
Canvas.SetLeft(current.TikzShape.Shape, 0);
Canvas.SetTop(current.TikzShape.Shape, 0);
return(current);
}
else
{
throw new Exception("Sth went wrong, bezier line should be drawn in 3 clicks");
}
}
