public static AffineMatrix FromPoint(PointF p)
{
AffineMatrix res = new AffineMatrix(3, 1);
res.Data[0][0] = p.X;
res.Data[1][0] = p.Y;
res.Data[2][0] = 1;
return(res);
}
public void Translate(float dx, float dy)
{
for (int i = 0; i < points.Count; ++i)
{
AffineTransformer t = new AffineTransformer(AffineMatrix.FromPoint(points[i]));
t.Translate(dx, dy);
points[i] = t.GetResult().ToPoint();
}
RaiseChangedEvent(PolygonChangeType.PointsChanged);
}
public static AffineMatrix ScaleMatrix(float width, float height)
{
AffineMatrix res = new AffineMatrix(3, 3);
res.Data[0][0] = width; res.Data[0][1] = 0; res.Data[0][2] = 0;
res.Data[1][0] = 0; res.Data[1][1] = height; res.Data[1][2] = 0;
res.Data[2][0] = 0; res.Data[2][1] = 0; res.Data[2][2] = 1;
return(res);
}
public static AffineMatrix TranslateMatrix(float dx, float dy)
{
AffineMatrix res = new AffineMatrix(3, 3);
res.Data[0][0] = 1; res.Data[0][1] = 0; res.Data[0][2] = dx;
res.Data[1][0] = 0; res.Data[1][1] = 1; res.Data[1][2] = dy;
res.Data[2][0] = 0; res.Data[2][1] = 0; res.Data[2][2] = 1;
return(res);
}
public void Rotate(float angle, PointF point)
{
for (int i = 0; i < points.Count; ++i)
{
AffineTransformer t = new AffineTransformer(AffineMatrix.FromPoint(points[i]));
t.Translate(-point.X, -point.Y);
t.Rotate(angle);
t.Translate(point.X, point.Y);
points[i] = t.GetResult().ToPoint();
}
RaiseChangedEvent(PolygonChangeType.PointsChanged);
}
public static AffineMatrix RotateMatrix(float angle)
{
AffineMatrix res = new AffineMatrix(3, 3);
double a = Math.PI * angle / 180;
res.Data[0][0] = (float)Math.Cos(a); res.Data[0][1] = (float)Math.Sin(a); res.Data[0][2] = 0;
res.Data[1][0] = (float)-Math.Sin(a); res.Data[1][1] = (float)Math.Cos(a); res.Data[1][2] = 0;
res.Data[2][0] = 0; res.Data[2][1] = 0; res.Data[2][2] = 1;
return(res);
}
public static AffineMatrix MultMatrices(AffineMatrix A, AffineMatrix B)
{
AffineMatrix C = new AffineMatrix(A.Rows, B.Columns);
for (int i = 0; i < A.Rows; i++)
{
for (int j = 0; j < B.Columns; j++)
{
for (int k = 0; k < A.Columns; k++)
{
C.Data[i][j] += A.Data[i][k] * B.Data[k][j];
}
}
}
return(C);
}
public void Scale(float width, float height)
{
float sumX = 0, sumY = 0;
for (int i = 0; i < points.Count; ++i)
{
sumX += points[i].X;
sumY += points[i].Y;
}
PointF transPoint = new PointF(sumX / points.Count, sumY / points.Count);
for (int i = 0; i < points.Count; ++i)
{
AffineTransformer t = new AffineTransformer(AffineMatrix.FromPoint(points[i]));
t.Translate(-transPoint.X, -transPoint.Y);
t.Scale(width, height);
t.Translate(transPoint.X, transPoint.Y);
points[i] = t.GetResult().ToPoint();
}
RaiseChangedEvent(PolygonChangeType.PointsChanged);
}
public void Scale(float width, float height)
{
matrix = AffineMatrix.MultMatrices(AffineMatrix.ScaleMatrix(width, height), matrix);
}
public void Rotate(float angle)
{
matrix = AffineMatrix.MultMatrices(AffineMatrix.RotateMatrix(angle), matrix);
}
public void Translate(float dx, float dy)
{
matrix = AffineMatrix.MultMatrices(AffineMatrix.TranslateMatrix(dx, dy), matrix);
}
public AffineTransformer(AffineMatrix m)
{
matrix = m;
}