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TransformationMatrix: add comment and improve multiplication

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This commit is contained in:
BobLd
2020-02-08 10:05:13 +00:00
committed by Eliot Jones
parent 1a11e49124
commit f05101ad07
1 changed files with 5 additions and 6 deletions
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11
src/UglyToad.PdfPig.Core/TransformationMatrix.cs
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@@ -360,10 +360,9 @@
E * scalar, F * scalar, row3 * scalar);
}
/// <summary>
///
/// <summary>
/// Get the inverse of the current matrix.
/// </summary>
/// <returns></returns>
public TransformationMatrix Inverse()
{
var a = (D * row3 - row2 * F);
@@ -379,9 +378,9 @@
var r3 = (A * D - B * C);
var det = A * a + B * c + row1 * e;
return new TransformationMatrix(a, b, r1,
c, d, r2,
e, f, r3).Multiply(1.0 / det);
return new TransformationMatrix(a / det, b / det, r1 / det,
c / det, d / det, r2 / det,
e / det, f / det, r3 / det);
}
/// <summary>