| public static RotationAt ( ICoordinate coordinate, double angle ) : Affine | ||
| coordinate | ICoordinate | Center of rotation |
| angle | double | An angle (in radians) of rotation |
| return | Affine | |
public static Affine RotationAt(ICoordinate coordinate, double angle)
{
Matrix matrix = new Matrix(
new double[,]
{
{ 1, 0, 0},
{ 0, 1, 0},
{ -coordinate.X, -coordinate.Y, 1},
});
matrix = matrix.Multiply(new Matrix(
new double[,]
{
{ Math.Cos(angle), Math.Sin(angle), 0},
{ -Math.Sin(angle), Math.Cos(angle), 0},
{ 0, 0, 1},
}));
matrix = matrix.Multiply(new Matrix(
new double[,]
{
{ 1, 0, 0},
{ 0, 1, 0},
{ coordinate.X, coordinate.Y, 1},
}));
return new Affine(matrix);
}
