static XMatrix CreateIdentity()
{
XMatrix matrix = new XMatrix();
matrix.SetMatrix(1, 0, 0, 1.0, 0, 0, XMatrixTypes.Identity);
return matrix;
}
internal static XMatrix CreateTranslation(double offsetX, double offsetY)
{
XMatrix matrix = new XMatrix();
matrix.SetMatrix(1, 0, 0, 1, offsetX, offsetY, XMatrixTypes.Translation);
return matrix;
}
internal static XMatrix CreateSkewRadians(double skewX, double skewY)
{
XMatrix matrix = new XMatrix();
matrix.SetMatrix(1, Math.Tan(skewY), Math.Tan(skewX), 1, 0, 0, XMatrixTypes.Unknown);
return matrix;
}
internal static XMatrix CreateScaling(double scaleX, double scaleY)
{
XMatrix matrix = new XMatrix();
matrix.SetMatrix(scaleX, 0, 0, scaleY, 0, 0, XMatrixTypes.Scaling);
return matrix;
}
internal static XMatrix CreateScaling(double scaleX, double scaleY, double centerX, double centerY)
{
XMatrix matrix = new XMatrix();
matrix.SetMatrix(scaleX, 0, 0, scaleY, centerX - scaleX * centerX, centerY - scaleY * centerY, XMatrixTypes.Scaling | XMatrixTypes.Translation);
return matrix;
}
internal static XMatrix CreateRotationRadians(double angle, double centerX, double centerY)
{
XMatrix matrix = new XMatrix();
double sin = Math.Sin(angle);
double cos = Math.Cos(angle);
double offsetX = (centerX * (1.0 - cos)) + (centerY * sin);
double offsetY = (centerY * (1.0 - cos)) - (centerX * sin);
matrix.SetMatrix(cos, sin, -sin, cos, offsetX, offsetY, XMatrixTypes.Unknown);
return matrix;
}