void scaling(out double x, out double y)
{
double x1 = 0.0;
double y1 = 0.0;
double x2 = 1.0;
double y2 = 1.0;
Perspective t = new Perspective(this);
t *= Affine.NewRotation(-rotation());
t.Transform(ref x1, ref y1);
t.Transform(ref x2, ref y2);
x = x2 - x1;
y = y2 - y1;
}
// Inverse transformation of x and y. It works slow because
// it explicitly inverts the matrix on every call. For massive
// operations it's better to invert() the matrix and then use
// direct transformations.
void inverse_transform(ref double x, ref double y)
{
Perspective t = new Perspective(this);
if (t.invert())
{
t.Transform(ref x, ref y);
}
}
public static VertexStore TransformToVxs(this Perspective perspecitveTx, VertexStoreSnap snap, VertexStore vxs)
{
var vsnapIter = snap.GetVertexSnapIter();
double x, y;
VertexCmd cmd;
do
{
cmd = vsnapIter.GetNextVertex(out x, out y);
perspecitveTx.Transform(ref x, ref y);
vxs.AddVertex(x, y, cmd);
} while (!VertexHelper.IsEmpty(cmd));
return(vxs);
}
public static VertexStore TransformToVxs(this Perspective perspecitveTx, VertexStore src, VertexStore vxs)
{
VertexCmd cmd;
double x, y;
int count = src.Count;
for (int i = 0; i < count; ++i)
{
cmd = src.GetVertex(i, out x, out y);
perspecitveTx.Transform(ref x, ref y);
vxs.AddVertex(x, y, cmd);
}
return(vxs);
}