private static MatrixF CreateIdentity()
{
MatrixF matrix = new MatrixF();
matrix.SetMatrix(1, 0,
0, 1,
0, 0,
MatrixTypes.TRANSFORM_IS_IDENTITY);
return(matrix);
}
internal static MatrixF CreateScaling(Float scaleX, Float scaleY)
{
MatrixF matrix = new MatrixF();
matrix.SetMatrix(scaleX, 0,
0, scaleY,
0, 0,
MatrixTypes.TRANSFORM_IS_SCALING);
return(matrix);
}
internal static MatrixF CreateTranslation(Float offsetX, Float offsetY)
{
MatrixF matrix = new MatrixF();
matrix.SetMatrix(1, 0,
0, 1,
offsetX, offsetY,
MatrixTypes.TRANSFORM_IS_TRANSLATION);
return(matrix);
}
internal static MatrixF CreateSkewRadians(Float skewX, Float skewY)
{
MatrixF matrix = new MatrixF();
matrix.SetMatrix(1.0F, (Float)Math.Tan(skewY),
(Float)Math.Tan(skewX), 1.0F,
0.0F, 0.0F,
MatrixTypes.TRANSFORM_IS_UNKNOWN);
return(matrix);
}
internal static MatrixF CreateScaling(Float scaleX, Float scaleY, Float centerX, Float centerY)
{
MatrixF matrix = new MatrixF();
matrix.SetMatrix(scaleX, 0,
0, scaleY,
centerX - scaleX * centerX, centerY - scaleY * centerY,
MatrixTypes.TRANSFORM_IS_SCALING | MatrixTypes.TRANSFORM_IS_TRANSLATION);
return(matrix);
}
internal static MatrixF CreateRotationRadians(Float angle, Float centerX, Float centerY)
{
MatrixF matrix = new MatrixF();
Float sin = (Float)Math.Sin(angle);
Float cos = (Float)Math.Cos(angle);
Float dx = (centerX * (1.0F - cos)) + (centerY * sin);
Float dy = (centerY * (1.0F - cos)) - (centerX * sin);
matrix.SetMatrix(cos, sin,
-sin, cos,
dx, dy,
MatrixTypes.TRANSFORM_IS_UNKNOWN);
return(matrix);
}
