invert method
void
invert()
Implementation
void invert() {
final a = this.a;
final b = this.b;
final c = this.c;
final d = this.d;
final tx = this.tx;
final ty = this.ty;
final det = this.det;
_data[0] = d / det;
_data[1] = -b / det;
_data[2] = -c / det;
_data[3] = a / det;
_data[4] = -tx * _data[0] - ty * _data[2];
_data[5] = -tx * _data[1] - ty * _data[3];
}