// Terminate transformation in a clean way, "freeing" animated properties
private void EndMatrixAnimation()
{
IsMatrixAnimationInProgress = false;
MainMatrixTransform.BeginAnimation(MatrixTransform.MatrixProperty, null);
// Final tasks
MainMatrixTransform.Matrix = rescaleMatrix;
}
// Adjust scale and origin to see the whole puzzle
internal void RescaleAndCenter(bool isWithAnimation)
{
if (viewModel.Layout == null)
{
return;
}
BoundingRectangle r = viewModel.Layout.Bounds;
// Add some extra margin and always represent a 20x20 grid at minimum
r = new BoundingRectangle(Math.Min(-11, r.Min.Row - 3), Math.Max(11, r.Max.Row + 4), Math.Min(-11, r.Min.Column - 3), Math.Max(11, r.Max.Column + 4));
// Reverse-transform corners into WordCanvas coordinates
Point p1Grid = new Point(r.Min.Column * UnitSize, r.Min.Row * UnitSize);
Point p2Grid = new Point(r.Max.Column * UnitSize, r.Max.Row * UnitSize);
rescaleMatrix = MainMatrixTransform.Matrix;
// Set rotation to zero
// Get angle from transformation matrix
double θ = Math.Atan2(rescaleMatrix.M21, rescaleMatrix.M11); // Just to use a variable named θ
rescaleMatrix.Rotate(θ / Math.PI * 180); // It would certainly kill Microsoft to indicate on Rotate page or Intellisense tooltip that angle is in degrees...
// First adjust scale
Point p1Screen = rescaleMatrix.Transform(p1Grid);
Point p2Screen = rescaleMatrix.Transform(p2Grid);
double rescaleFactorX = ClippingCanvas.ActualWidth / (p2Screen.X - p1Screen.X);
double rescaleFactorY = ClippingCanvas.ActualHeight / (p2Screen.Y - p1Screen.Y);
double rescaleFactor = Math.Min(rescaleFactorX, rescaleFactorY);
rescaleMatrix.Scale(rescaleFactor, rescaleFactor);
// Then adjust location and center
p1Screen = rescaleMatrix.Transform(p1Grid);
p2Screen = rescaleMatrix.Transform(p2Grid);
double offX1 = -p1Screen.X;
double offX2 = ClippingCanvas.ActualWidth - p2Screen.X;
double offY1 = -p1Screen.Y;
double offY2 = ClippingCanvas.ActualHeight - p2Screen.Y;
rescaleMatrix.Translate((offX1 + offX2) / 2, (offY1 + offY2) / 2);
if (isWithAnimation)
{
// Use an animation for a smooth transformation
MatrixAnimation ma = new MatrixAnimation
{
From = MainMatrixTransform.Matrix,
To = rescaleMatrix,
Duration = new Duration(TimeSpan.FromSeconds(0.35))
};
ma.Completed += MatrixAnimationCompleted;
IsMatrixAnimationInProgress = true;
MainMatrixTransform.BeginAnimation(MatrixTransform.MatrixProperty, ma);
}
else
{
EndMatrixAnimation();
}
}
