public static IEnumerable <GsVector> CreateBezier(float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4)
{
GsVector[] array = new GsVector[]
{
new GsVector(x1, y1),
new GsVector(x2, y2),
new GsVector(x3, y3),
new GsVector(x4, y4),
};
return(CreateBezier(array));
}
/// <summary>
/// Calculate the projection of a polygon on an axis and returns it as a [min, max] interval
/// </summary>
private static void ProjectPolygon(GsVector axis, GsPolygon hull, ref float min, ref float max)
{
// get the points
GsVector[] points = hull.mPoints;
// To project a point on an axis use the dot product
float d = GsVector.Dot(axis, points[0]);
min = d;
max = d;
for (int i = 0; i < points.Length; i++)
{
d = GsVector.Dot(points[i], axis);
min = Math.Min(min, d);
max = Math.Max(max, d);
}
}
public static GsVector Rotate(this GsVector pointToRotate, GsVector centerPoint, double angleInDegrees)
{
double angleInRadians = angleInDegrees * (Math.PI / 180);
double cosTheta = Math.Cos(angleInRadians);
double sinTheta = Math.Sin(angleInRadians);
return(new GsVector
{
X =
(float)
(cosTheta * (pointToRotate.X - centerPoint.X) -
sinTheta * (pointToRotate.Y - centerPoint.Y) + centerPoint.X),
Y =
(float)
(sinTheta * (pointToRotate.X - centerPoint.X) +
cosTheta * (pointToRotate.Y - centerPoint.Y) + centerPoint.Y)
});
}
private GsVector[] GetPoints(GsVector[] hull, GsMatrix transform)
{
mMinX = float.MaxValue;
mMaxX = float.MinValue;
mMinY = float.MaxValue;
mMaxY = float.MinValue;
List <GsVector> points = new List <GsVector>(hull.Length);
foreach (GsVector pt in hull)
{
points.Add(GsVector.Transform(pt, transform));
float x = points[points.Count - 1].X;
float y = points[points.Count - 1].Y;
mMinX = Math.Min(mMinX, x);
mMinY = Math.Min(mMinY, y);
mMaxX = Math.Max(mMaxX, x);
mMaxY = Math.Max(mMaxY, y);
}
return(points.ToArray());
}
/// <summary>
/// tests if a point is Left|On|Right of an infinite line.
/// </summary>
/// <param name="P0">Point 1.</param>
/// <param name="P1">Point 2.</param>
/// <param name="P2">Point 3.</param>
/// <returns>
/// >0 for P2 left of the line through P0 and P1
/// =0 for P2 on the line
/// <0 for P2 right of the line
/// </returns>
private static float isLeft(GsVector P0, GsVector P1, GsVector P2)
{
return((P1.X - P0.X) * (P2.Y - P0.Y) - (P2.X - P0.X) * (P1.Y - P0.Y));
}
public bool Contains(GsVector pt)
{
return(Contains(pt.X, pt.Y));
}
public void Offset(GsVector pos)
{
Offset(pos.X, pos.Y);
}
public GsRectangle(GsVector location, GsSize size)
: this(location.X, location.Y, size.Width, size.Height)
{
}
public static GsRectangle Offset(GsRectangle box, GsVector offset)
{
return(new GsRectangle(box.Location + offset, box.Size));
}
public static IEnumerable <GsVector> CreateRoundRect(GsRectangle rect, float radius, RectangleCorners corners)
{
float l = rect.Left;
float t = rect.Top;
float r = rect.Right;
float b = rect.Bottom;
float lr = rect.Left + radius;
float tr = rect.Top + radius;
float rr = rect.Right - radius;
float br = rect.Bottom - radius;
List <GsVector> polygon = new List <GsVector>();
// upper-left
if ((corners & RectangleCorners.TopLeft) != 0)
{
GsVector[] upleft_corner = new GsVector[3]
{
new GsVector(l, tr),
new GsVector(l, t),
new GsVector(lr, t),
};
polygon.AddRange(CreateBezier(upleft_corner));
}
else
{
polygon.Add(new GsVector(l, t));
}
// upper-right
if ((corners & RectangleCorners.TopRight) != 0)
{
GsVector[] upright_corner = new GsVector[3]
{
new GsVector(rr, t),
new GsVector(r, t),
new GsVector(r, tr),
};
polygon.AddRange(CreateBezier(upright_corner));
}
else
{
polygon.Add(new GsVector(r, t));
}
// bottom-right
if ((corners & RectangleCorners.BottomRight) != 0)
{
GsVector[] bottomright_corner = new GsVector[3]
{
new GsVector(r, br),
new GsVector(r, b),
new GsVector(rr, b),
};
polygon.AddRange(CreateBezier(bottomright_corner));
}
else
{
polygon.Add(new GsVector(r, b));
}
// bottom-left
if ((corners & RectangleCorners.BottomLeft) != 0)
{
GsVector[] bottomleft_corner = new GsVector[3]
{
new GsVector(lr, b),
new GsVector(l, b),
new GsVector(l, br),
};
polygon.AddRange(CreateBezier(bottomleft_corner));
}
else
{
polygon.Add(new GsVector(l, b));
}
// close it up
polygon.Add(polygon[0]);
// return it!
return(polygon);
}
private static GsVector CalculatePosition(GsSize size, float x, float y, float width, float height, GsAlignment alignment)
{
GsVector pos = new GsVector(x, y);
float top = y;
float middle = (y + (height / 2)) - (size.Height / 2);
float bottom = (y + height) - size.Height;
float left = x;
float center = (x + (width / 2)) - (size.Width / 2);
float right = (x + width) - size.Width;
switch (alignment)
{
case GsAlignment.BottomCenter:
pos.X = center;
pos.Y = bottom;
break;
case GsAlignment.BottomLeft:
pos.X = left;
pos.Y = bottom;
break;
case GsAlignment.BottomRight:
pos.X = right;
pos.Y = bottom;
break;
case GsAlignment.MiddleCenter:
pos.X = center;
pos.Y = middle;
break;
case GsAlignment.MiddleLeft:
pos.X = left;
pos.Y = middle;
break;
case GsAlignment.MiddleRight:
pos.X = right;
pos.Y = middle;
break;
case GsAlignment.TopCenter:
pos.X = center;
pos.Y = top;
break;
case GsAlignment.TopLeft:
pos.X = left;
pos.Y = top;
break;
case GsAlignment.TopRight:
pos.X = right;
pos.Y = top;
break;
}
return(pos);
}