/// <summary>
/// Zoom in/out centered on the specified point (in content coordinates).
/// The focus point is kept locked to it's on screen position (ala google maps).
/// </summary>
public void ZoomAboutPoint(double newContentScale, Point contentZoomFocus)
{
newContentScale = Math.Min(Math.Max(newContentScale, MinContentScale), MaxContentScale);
double screenSpaceZoomOffsetX = (contentZoomFocus.X - ContentOffsetX) * ContentScale;
double screenSpaceZoomOffsetY = (contentZoomFocus.Y - ContentOffsetY) * ContentScale;
double contentSpaceZoomOffsetX = screenSpaceZoomOffsetX / newContentScale;
double contentSpaceZoomOffsetY = screenSpaceZoomOffsetY / newContentScale;
double newContentOffsetX = contentZoomFocus.X - contentSpaceZoomOffsetX;
double newContentOffsetY = contentZoomFocus.Y - contentSpaceZoomOffsetY;
AnimationHelper.CancelAnimation(this, ContentScaleProperty);
AnimationHelper.CancelAnimation(this, ContentOffsetXProperty);
AnimationHelper.CancelAnimation(this, ContentOffsetYProperty);
this.ContentScale = newContentScale;
this.ContentOffsetX = newContentOffsetX;
this.ContentOffsetY = newContentOffsetY;
}
/// <summary>
/// Zoom in/out centered on the specified point (in content coordinates).
/// The focus point is kept locked to it's on screen position (ala google maps).
/// </summary>
public void ZoomAboutPoint(double newContentZoom, Point contentZoomFocus)
{
newContentZoom = Math.Min(Math.Max(newContentZoom, MinimumZoomClamped), MaximumZoom);
var screenSpaceZoomOffsetX = (contentZoomFocus.X - ContentOffsetX) * InternalViewportZoom;
var screenSpaceZoomOffsetY = (contentZoomFocus.Y - ContentOffsetY) * InternalViewportZoom;
var contentSpaceZoomOffsetX = screenSpaceZoomOffsetX / newContentZoom;
var contentSpaceZoomOffsetY = screenSpaceZoomOffsetY / newContentZoom;
var newContentOffsetX = contentZoomFocus.X - contentSpaceZoomOffsetX;
var newContentOffsetY = contentZoomFocus.Y - contentSpaceZoomOffsetY;
AnimationHelper.CancelAnimation(this, InternalViewportZoomProperty);
AnimationHelper.CancelAnimation(this, ContentOffsetXProperty);
AnimationHelper.CancelAnimation(this, ContentOffsetYProperty);
this.InternalViewportZoom = newContentZoom;
this.ContentOffsetX = newContentOffsetX;
this.ContentOffsetY = newContentOffsetY;
RaiseCanExecuteChanged();
}
/// <summary>
/// Zoom in/out centered on the specified point (in content coordinates).
/// The focus point is kept locked to it's on screen position (ala google maps).
/// </summary>
public void AnimatedZoomAboutPoint(double newContentScale, Point contentZoomFocus)
{
newContentScale = Math.Min(Math.Max(newContentScale, MinContentScale), MaxContentScale);
AnimationHelper.CancelAnimation(this, ContentZoomFocusXProperty);
AnimationHelper.CancelAnimation(this, ContentZoomFocusYProperty);
AnimationHelper.CancelAnimation(this, ViewportZoomFocusXProperty);
AnimationHelper.CancelAnimation(this, ViewportZoomFocusYProperty);
ContentZoomFocusX = contentZoomFocus.X;
ContentZoomFocusY = contentZoomFocus.Y;
ViewportZoomFocusX = (ContentZoomFocusX - ContentOffsetX) * ContentScale;
ViewportZoomFocusY = (ContentZoomFocusY - ContentOffsetY) * ContentScale;
//
// When zooming about a point make updates to ContentScale also update content offset.
//
enableContentOffsetUpdateFromScale = true;
AnimationHelper.StartAnimation(this, ContentScaleProperty, newContentScale, AnimationDuration,
delegate(object sender, EventArgs e)
{
enableContentOffsetUpdateFromScale = false;
ResetViewportZoomFocus();
});
}
//
// Fade out the drag zoom rectangle.
//
private void FadeOutDragZoomRect()
{
AnimationHelper.StartAnimation(_partDragZoomBorder, OpacityProperty, 0.0, 0.1,
delegate { _partDragZoomCanvas.Visibility = Visibility.Collapsed; }, UseAnimations);
}
