protected void OnShapeCircleMouse(Event guiEvent)
{
Vector2 shapePosition = MouseToShapePoint(mousePosition);
if (guiEvent.type == EventType.MouseDown)
{
CircleShape newCircle = CircleShape.Create(shapePosition, 0f);
newCircle.penToMeshScale = mouseToShapeScale;
newCircle.colorOutline = shapeOutlineColor;
newCircle.colorFill = shapeFillColor;
SetFocusedShape(newCircle);
Repaint();
}
else if (guiEvent.type == EventType.MouseDrag)
{
CircleShape activeCircle = focusedShape as CircleShape;
if (activeCircle != null)
{
Vector2 shapeDownPosition = MouseToShapePoint(mouseDownPosition);
activeCircle.Radius = Vector2.Distance(shapeDownPosition, shapePosition);
Repaint();
}
}
}
private static VectorShape TryParseShapeToCircle(Shape shape, Matrix2D transform)
{
if (shape.Contours.Length > 1)
{
return(null);
}
BezierContour contour = shape.Contours[0];
if (contour.Segments.Length < 5)
{
return(null);
}
if (!contour.Closed)
{
return(null);
}
BezierSegment[] segments = new BezierSegment[contour.Segments.Length - 1];
for (int i = 0; i < segments.Length; i++)
{
segments[i].P0 = transform.MultiplyPoint(contour.Segments[i].P0);
segments[i].P1 = transform.MultiplyPoint(contour.Segments[i].P1);
segments[i].P2 = transform.MultiplyPoint(contour.Segments[i].P2);
segments[i].P3 = transform.MultiplyPoint(contour.Segments[(i + 1)].P0);
}
Rect shapeBounds = VectorUtils.Bounds(VectorUtils.BezierSegmentsToPath(segments));
Vector2 center = shapeBounds.center;
float radius = (shapeBounds.width + shapeBounds.height) / 4f;
float error = radius / 200f;
for (int i = 0; i < segments.Length; i++)
{
if (Mathf.Abs(Vector2.Distance(center, segments[i].P0) - radius) > error)
{
return(null);
}
Vector2 midpoint = VectorUtils.Eval(segments[i], 0.5f);
if (Mathf.Abs(Vector2.Distance(center, midpoint) - radius) > error)
{
return(null);
}
}
CircleShape circle = CircleShape.Create(center, radius);
circle.colorOutline = Color.red;
return(circle);
}