我疯了，我整日都在搜索试图解决这个问题，我把数据绑定到数据库并捏缩放工作：
<Grid x:Name="LayoutRoot">
<ProgressBar x:Name="progressBar" Width="480" Margin="0,125,0,0" Height="10" VerticalAlignment="Top" IsIndeterminate="{Binding ShowProgressBar}" Visibility="{Binding ShowProgressBar, Converter={StaticResource BooleanToVisibilityConverter}}"></ProgressBar>
<Image x:Name="image" CacheMode="BitmapCache" Width="480" Stretch="Uniform" VerticalAlignment="Center">
<Image.RenderTransform>
<CompositeTransform x:Name="transform" />
</Image.RenderTransform>
<toolkit:GestureService.GestureListener>
<toolkit:GestureListener PinchStarted="OnPinchStarted" PinchDelta="OnPinchDelta" PinchCompleted="OnPinchCompleted" DragDelta="OnDragDelta" DragStarted="OnDragStarted" DragCompleted="OnDragCompleted" />
</toolkit:GestureService.GestureListener>
</Image>
</Grid>
private void OnPinchStarted(object sender, PinchStartedGestureEventArgs e)
{
image = sender as Image;
transform = image.RenderTransform as CompositeTransform;
initialScale = transform.ScaleX;
}
private void OnPinchDelta(object sender, PinchGestureEventArgs e)
{
if (initialScale >= 1)
{
transform.ScaleX = initialScale * e.DistanceRatio;
transform.ScaleY = initialScale * e.DistanceRatio;
}
}
private void OnPinchCompleted(object sender, PinchGestureEventArgs e)
{
if ((transform.ScaleX < 1) || (transform.ScaleY < 1))
{
transform.ScaleX = 1;
transform.ScaleY = 1;
transform.TranslateX = 0;
transform.TranslateY = -240;
}
}
private void OnDragStarted(object sender, DragStartedGestureEventArgs e)
{
PANEL_DRAG_HORIZONTAL = 0;
}
private void OnDragDelta(object sender, DragDeltaGestureEventArgs e)
{
if ((transform.ScaleX <= 1) || (transform.ScaleY <= 1))
{
if (e.Direction == System.Windows.Controls.Orientation.Horizontal)
{
PANEL_DRAG_HORIZONTAL += e.HorizontalChange;
}
}
else
{
transform.TranslateX += e.HorizontalChange;
transform.TranslateY += e.VerticalChange;
}
}
private void OnDragCompleted(object sender, DragCompletedGestureEventArgs e)
{
if (transform.TranslateX > 0)
transform.TranslateX = 0;
if (transform.TranslateY > -240)
transform.TranslateY = -240;
if ((transform.ScaleX <= 1) || (transform.ScaleY <= 1))
{
if (e.Direction == System.Windows.Controls.Orientation.Horizontal)
{
var abs = Math.Abs(PANEL_DRAG_HORIZONTAL);
if (abs > 75)
{
if (PANEL_DRAG_HORIZONTAL > 0) // MovePrevious;
{ MessageBox.Show("prev"); }
else //MoveNext();
{ MessageBox.Show("next"); }
e.Handled = true;
}
}
}
}
但是我无法在变换后获得正确的图像大小，因为我希望在左/右侧拖动后避免丢失它...我在这里轻松处理了这个问题
private void OnDragCompleted(object sender, DragCompletedGestureEventArgs e)
{
if (transform.TranslateX > 0)
transform.TranslateX = 0;
if (transform.TranslateY > -240)
transform.TranslateY = -240;
如果不清楚的话，我很抱歉，但我真的很讨厌...希望得到你的帮助
答案 0 :(得分：3)
如果你有图像的原始边界（x，y，宽度，高度），你可以自己运行变换并检查结果。
Rect newBounds = transform.TransformBounds(new Rect(imgX,imgY,imgWidth,imgHeight));
答案 1 :(得分：-1)
这样解决了，还有代码在swap上导航图片
// these two fields fully define the zoom state:
private double TotalImageScale = 1d;
private Point ImagePosition = new Point(0, 0);
private const double MAX_IMAGE_ZOOM = 5;
private Point _oldFinger1;
private Point _oldFinger2;
private double _oldScaleFactor;
double PANEL_DRAG_HORIZONTAL = 0;
#region Event handlers
/// <summary>
/// Initializes the zooming operation
/// </summary>
private void OnPinchStarted(object sender, PinchStartedGestureEventArgs e)
{
_oldFinger1 = e.GetPosition(ImgZoom, 0);
_oldFinger2 = e.GetPosition(ImgZoom, 1);
_oldScaleFactor = 1;
}
/// <summary>
/// Computes the scaling and translation to correctly zoom around your fingers.
/// </summary>
private void OnPinchDelta(object sender, PinchGestureEventArgs e)
{
var scaleFactor = e.DistanceRatio / _oldScaleFactor;
if (!IsScaleValid(scaleFactor))
return;
var currentFinger1 = e.GetPosition(ImgZoom, 0);
var currentFinger2 = e.GetPosition(ImgZoom, 1);
var translationDelta = GetTranslationDelta(
currentFinger1,
currentFinger2,
_oldFinger1,
_oldFinger2,
ImagePosition,
scaleFactor);
_oldFinger1 = currentFinger1;
_oldFinger2 = currentFinger2;
_oldScaleFactor = e.DistanceRatio;
UpdateImageScale(scaleFactor);
UpdateImagePosition(translationDelta);
}
/// <summary>
/// Resets the image scaling and position
/// </summary>
private void OnDoubleTap(object sender, Microsoft.Phone.Controls.GestureEventArgs e)
{
ResetImagePosition();
}
private void OnDragStarted(object sender, DragStartedGestureEventArgs e)
{
PANEL_DRAG_HORIZONTAL = 0;
}
/// <summary>
/// Moves the image around following your finger.
/// </summary>
private void OnDragDelta(object sender, DragDeltaGestureEventArgs e)
{
if (e.Direction == System.Windows.Controls.Orientation.Horizontal)
PANEL_DRAG_HORIZONTAL += e.HorizontalChange;
var translationDelta = new Point(e.HorizontalChange, e.VerticalChange);
if (IsDragValid(1, translationDelta))
UpdateImagePosition(translationDelta);
}
private void OnDragCompleted(object sender, DragCompletedGestureEventArgs e)
{
if ((e.Direction == System.Windows.Controls.Orientation.Horizontal) && (TotalImageScale <= 1.1))
{
var abs = Math.Abs(PANEL_DRAG_HORIZONTAL);
if (abs > 75)
{
if (PANEL_DRAG_HORIZONTAL > 0) // MovePrevious;
{
if (pictureId > 0)
{
_MyProgressBar.ShowProgressBar = true;
pictureId--;
LoadPictures(AllPictures[pictureId]);
}
else
MessageBox.Show("first");
}
else //MoveNext();
{
if (pictureId < count)
{
_MyProgressBar.ShowProgressBar = true;
pictureId++;
LoadPictures(AllPictures[pictureId]);
}
else
MessageBox.Show("last");
}
e.Handled = true;
}
}
}
#endregion
#region Utils
/// <summary>
/// Computes the translation needed to keep the image centered between your fingers.
/// </summary>
private Point GetTranslationDelta(
Point currentFinger1, Point currentFinger2,
Point oldFinger1, Point oldFinger2,
Point currentPosition, double scaleFactor)
{
var newPos1 = new Point(
currentFinger1.X + (currentPosition.X - oldFinger1.X) * scaleFactor,
currentFinger1.Y + (currentPosition.Y - oldFinger1.Y) * scaleFactor);
var newPos2 = new Point(
currentFinger2.X + (currentPosition.X - oldFinger2.X) * scaleFactor,
currentFinger2.Y + (currentPosition.Y - oldFinger2.Y) * scaleFactor);
var newPos = new Point(
(newPos1.X + newPos2.X) / 2,
(newPos1.Y + newPos2.Y) / 2);
return new Point(
newPos.X - currentPosition.X,
newPos.Y - currentPosition.Y);
}
/// <summary>
/// Updates the scaling factor by multiplying the delta.
/// </summary>
private void UpdateImageScale(double scaleFactor)
{
TotalImageScale *= scaleFactor;
ApplyScale();
}
/// <summary>
/// Applies the computed scale to the image control.
/// </summary>
private void ApplyScale()
{
((CompositeTransform)ImgZoom.RenderTransform).ScaleX = TotalImageScale;
((CompositeTransform)ImgZoom.RenderTransform).ScaleY = TotalImageScale;
}
/// <summary>
/// Updates the image position by applying the delta.
/// Checks that the image does not leave empty space around its edges.
/// </summary>
private void UpdateImagePosition(Point delta)
{
var newPosition = new Point(ImagePosition.X + delta.X, ImagePosition.Y + delta.Y);
if (newPosition.X > 0) newPosition.X = 0;
if (newPosition.Y > 0) newPosition.Y = 0;
if ((ImgZoom.ActualWidth * TotalImageScale) + newPosition.X < ImgZoom.ActualWidth)
newPosition.X = ImgZoom.ActualWidth - (ImgZoom.ActualWidth * TotalImageScale);
if ((ImgZoom.ActualHeight * TotalImageScale) + newPosition.Y < ImgZoom.ActualHeight)
newPosition.Y = ImgZoom.ActualHeight - (ImgZoom.ActualHeight * TotalImageScale);
ImagePosition = newPosition;
ApplyPosition();
}
/// <summary>
/// Applies the computed position to the image control.
/// </summary>
private void ApplyPosition()
{
((CompositeTransform)ImgZoom.RenderTransform).TranslateX = ImagePosition.X;
((CompositeTransform)ImgZoom.RenderTransform).TranslateY = ImagePosition.Y;
}
/// <summary>
/// Resets the zoom to its original scale and position
/// </summary>
private void ResetImagePosition()
{
TotalImageScale = 1;
ImagePosition = new Point(0, 0);
ApplyScale();
ApplyPosition();
}
/// <summary>
/// Checks that dragging by the given amount won't result in empty space around the image
/// </summary>
private bool IsDragValid(double scaleDelta, Point translateDelta)
{
if (ImagePosition.X + translateDelta.X > 0 || ImagePosition.Y + translateDelta.Y > 0)
return false;
if ((ImgZoom.ActualWidth * TotalImageScale * scaleDelta) + (ImagePosition.X + translateDelta.X) < ImgZoom.ActualWidth)
return false;
if ((ImgZoom.ActualHeight * TotalImageScale * scaleDelta) + (ImagePosition.Y + translateDelta.Y) < ImgZoom.ActualHeight)
return false;
return true;
}
/// <summary>
/// Tells if the scaling is inside the desired range
/// </summary>
private bool IsScaleValid(double scaleDelta)
{
return (TotalImageScale * scaleDelta >= 1) && (TotalImageScale * scaleDelta <= MAX_IMAGE_ZOOM);
}
#endregion