public static Matrix2D scaleM(double x, double y)
{
Matrix2D matrix = new Matrix2D();
matrix.elements[0,0] = x;
matrix.elements[1,1] = y;
matrix.elements[2,2] = 1;
return matrix;
}
public static Matrix2D operator *(Matrix2D m1, Matrix2D m2)
{
Matrix2D matrix = new Matrix2D();
for (int i = 0; i < 3; i++)
for (int j = 0; j < 3; j++) {
double sum = 0;
for (int k = 0; k < 3; k++)
sum += m1.elements[k, j] * m2.elements[i, k];
matrix.elements[i, j] = sum;
}
return matrix;
}
public static Matrix2D identityM()
{
Matrix2D matrix = new Matrix2D();
for (int i = 0; i < 3; i++)
matrix.elements[i, i] = 1;
return matrix;
}
protected void transformVectors(Matrix2D matrix)
{
Random randGen = new Random();
for (int j = 0; j < polygons.Count; j++) {
ArrayList vertices = (ArrayList)polygons[j];
for (int i = 0; i < vertices.Count; i++) {
DoubleVector2 vertexOld = (DoubleVector2)vertices[i];
vertices.RemoveAt(i);
DoubleVector2 vertexNew = vertexOld * matrix;
// add a little random jitter so as to remove the 'horizontal line' bug
vertexNew.x += randGen.NextDouble() / 100000.0;
vertexNew.y += randGen.NextDouble() / 100000.0;
vertices.Insert(i, vertexNew);
}
}
for (int i = 0; i < objects.Count; i++) {
ElmaObject objectNow = (ElmaObject)objects[i];
DoubleVector2 vertexOld = new DoubleVector2(objectNow.x, objectNow.y);
objects.RemoveAt(i);
DoubleVector2 vertexNew = vertexOld * matrix;
objectNow.x = vertexNew.x;
objectNow.y = vertexNew.y;
objects.Insert(i, objectNow);
}
getMinMax();
}
