public static Matrix GetTransform(this Node node)
{
double anchorX = node.AnchorX * node.Width;
double anchorY = node.AnchorY * node.Height;
Matrix transform = new Matrix ();
transform.Translate (node.X + anchorX, node.Y + anchorY);
transform.Rotate (node.Rotation);
transform.Scale (node.Scale, node.Scale);
transform.Translate (-anchorX, -anchorY);
return transform;
}
//
// this functions calculates the transformation needed to center and completely fill the
// viewport with the Surface at the given tilt
//
public Matrix Fill(Gdk.Rectangle viewport, double tilt)
{
if (tilt == 0.0)
return Fill (viewport);
Matrix m = new Matrix ();
m.InitIdentity ();
double len;
double orig_len;
if (Bounds.Width > Bounds.Height) {
len = viewport.Height;
orig_len = Bounds.Height;
} else {
len = viewport.Width;
orig_len = Bounds.Width;
}
double a = Math.Sqrt (viewport.Width * viewport.Width + viewport.Height * viewport.Height);
double alpha = Math.Acos (len / a);
double theta = alpha - Math.Abs (tilt);
double slen = a * Math.Cos (theta);
double scale = slen / orig_len;
double x_offset = (viewport.Width - Bounds.Width * scale) / 2.0;
double y_offset = (viewport.Height - Bounds.Height * scale) / 2.0;
m.Translate (x_offset, y_offset);
m.Scale (scale, scale);
m.Invert ();
m.Translate (viewport.Width * 0.5, viewport.Height * 0.5);
m.Rotate (tilt);
m.Translate (viewport.Width * -0.5, viewport.Height * -0.5);
m.Invert ();
return m;
}
public void Rotate (double angle, Size new_size)
{
double radians = (angle / 180d) * Math.PI;
var old_size = PintaCore.Workspace.ImageSize;
var xform = new Matrix ();
xform.Translate (new_size.Width / 2.0, new_size.Height / 2.0);
xform.Rotate (radians);
xform.Translate (-old_size.Width / 2.0, -old_size.Height / 2.0);
ApplyTransform (xform, new_size);
}
private static Matrix ComputeMatrix (RotateZoomData data)
{
var xform = new Matrix ();
var image_size = PintaCore.Workspace.ImageSize;
var center_x = image_size.Width / 2.0;
var center_y = image_size.Height / 2.0;
xform.Translate ((1 + data.Pan.X) * center_x, (1 + data.Pan.Y) * center_y);
xform.Rotate ((-data.Angle / 180d) * Math.PI);
xform.Scale (data.Zoom, data.Zoom);
xform.Translate (-center_x, -center_y);
return xform;
}
