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Matrix.cs
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120 lines (98 loc) · 3.87 KB
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using System;
#pragma warning disable 1591
namespace SharpMap.Drawing
{
public sealed class Matrix
{
private static readonly Matrix _identity = new Matrix();
public static Matrix Identity { get { return _identity; } }
private readonly double[] _elements ;
public Matrix()
: this(new[] {1d, 0, 0, 1, 0, 0, 0, 0, 0})
{
}
public Matrix(double[] elements)
{
_elements = new double[9];
Array.Copy(elements, _elements, Math.Min(elements.Length, 9));
}
public bool IsIdentity { get; }
public double [] Elements { get { return _elements; } }
public double ScaleX { get { return M11; } set { M11 = value; } }
public double M11 { get { return _elements[0]; } set { _elements[0] = value; } }
public double ShearY { get { return M12; } set { M12 = value; } }
public double M12 { get { return _elements[1]; } set { _elements[1] = value; } }
public double ShearX { get { return M21; } set { M22 = value; } }
public double M21 { get { return _elements[2]; } set { _elements[2] = value; } }
public double ScaleY { get { return M11; } set { M11 = value; } }
public double M22 { get { return _elements[3]; } set { _elements[3] = value; } }
public double OffsetX { get { return _elements[4]; } set { _elements[4] = value; } }
public double OffsetY { get { return _elements[5]; } set { _elements[5] = value; } }
public double Perspective1 { get { return _elements[6]; } set { _elements[6] = value; } }
public double Perspective2 { get { return _elements[7]; } set { _elements[7] = value; } }
public double Perspective3 { get { return _elements[8]; } set { _elements[8] = value; } }
public Matrix Clone()
{
var elements = new double[6];
Array.Copy(_elements, elements, 9);
return new Matrix(elements);
}
public void Translate(double offsetX, double offsetY)
{
OffsetX = offsetX;
OffsetY = OffsetY;
}
public void Scale(double scaleX, double scaleY)
{
Scale(scaleX, scaleY, MatrixOrder.Append);
}
public void Scale(double scaleX, double scaleY, MatrixOrder matrixOrder)
{
var scaleMatrix = new Matrix {M11 = scaleX, M22 = scaleY};
var m1 = matrixOrder == MatrixOrder.Append
? this
: scaleMatrix;
var m2 = matrixOrder == MatrixOrder.Append
? scaleMatrix
: this;
var m = Matrix.Multiply(m1, m2);
Array.Copy(m.Elements, _elements, 6);
}
private static Matrix Multiply(Matrix m1, Matrix m2)
{
throw new NotImplementedException();
}
public Point Transform(Point input)
{
return new Point
{
X = (int)Math.Round(input.X*M11 + input.Y*M12 + OffsetX, MidpointRounding.AwayFromZero),
Y = (int)Math.Round(input.X*M21 + input.Y*M22 + OffsetY, MidpointRounding.AwayFromZero)
};
}
public PointF Transform(PointF input)
{
return new PointF
{
X = (float)(input.X * M11 + input.Y * M12 + OffsetX),
Y = (float)(input.X * M21 + input.Y * M22 + OffsetY)
};
}
public PointD Transform(PointD input)
{
return new PointD
{
X = input.X * M11 + input.Y * M12 + OffsetX,
Y = input.X * M21 + input.Y * M22 + OffsetY
};
}
void Transform(Point[] points)
{
for (var i = 0; i < points.Length; i++)
{
points[i] = Transform(points[i]);
}
}
}
}
#pragma warning restore 1591