I found this Pinch-to-zoom example at http://forums.create.msdn.com
这是XAML代码:
它对于小图像(小于2000x2000像素)效果很好。但在我的示例中,我有这张巨大的地铁地图(http://www.vasttrafik.se/upload/Linjekartor_hogupplost/Goteborg2010/Linjen%C3%A4tskarta-101212.png或向量http://www.vasttrafik.se/upload/Linjekartor_hogupplost/Goteborg2010/Linjen%C3%A4tskarta-101212.pdf)。如果用户能够缩放矢量图像将更加美观,但是导入如此巨大的矢量图形会引起严重的性能问题。
也许我可以将图像分成几个“多尺度图像”,并使用此http://dotnetbyexample.blogspot.com/2010/08/windows-phone-7-multi-touch-panzoom.html,但我真的不知道如何使用他的类:(
有什么想法吗?你们怎么解决这个问题?
谢谢
理查德
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<StackPanel>
<TextBlock Text="Tap to center" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock Text="Tap and hold to reset" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock Text="Touch and move to drag" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock Text="Pinch (touch with two fingers) to scale and rotate" Style="{StaticResource PhoneTextNormalStyle}" TextWrapping="Wrap"/>
<TextBlock Text="Flick (drag and release the touch while still moving) will show flick data on bottom of screen." Style="{StaticResource PhoneTextNormalStyle}" TextWrapping="Wrap"/>
</StackPanel>
<TextBlock x:Name="flickData" Text="Flick:" Style="{StaticResource PhoneTextNormalStyle}" VerticalAlignment="Bottom"/>
<Image x:Name="image" Source="/map.jpg" RenderTransformOrigin="0.5,0.5" CacheMode="BitmapCache">
<Image.RenderTransform>
<CompositeTransform x:Name="transform"/>
</Image.RenderTransform>
<toolkit:GestureService.GestureListener>
<toolkit:GestureListener
Tap="OnTap" Hold="OnHold"
DragStarted="OnDragStarted" DragDelta="OnDragDelta" DragCompleted="OnDragCompleted"
Flick="OnFlick"
PinchStarted="OnPinchStarted" PinchDelta="OnPinchDelta" PinchCompleted="OnPinchCompleted"/>
</toolkit:GestureService.GestureListener>
</Image>
</Grid>
而且cs源代码:
public partial class GestureSample : PhoneApplicationPage
{
double initialAngle;
double initialScale;
public GestureSample()
{
InitializeComponent();
}
private void OnTap(object sender, GestureEventArgs e)
{
transform.TranslateX = transform.TranslateY = 0;
}
private void OnDoubleTap(object sender, GestureEventArgs e)
{
transform.ScaleX = transform.ScaleY = 1;
}
private void OnHold(object sender, GestureEventArgs e)
{
transform.TranslateX = transform.TranslateY = 0;
transform.ScaleX = transform.ScaleY = 1;
transform.Rotation = 0;
}
private void OnDragStarted(object sender, DragStartedGestureEventArgs e)
{
image.Opacity = 0.3;
}
private void OnDragDelta(object sender, DragDeltaGestureEventArgs e)
{
transform.TranslateX += e.HorizontalChange;
transform.TranslateY += e.VerticalChange;
}
private void OnDragCompleted(object sender, DragCompletedGestureEventArgs e)
{
image.Opacity = 1.0;
}
private void OnPinchStarted(object sender, PinchStartedGestureEventArgs e)
{
Point point0 = e.GetPosition(image, 0);
Point point1 = e.GetPosition(image, 1);
Point midpoint = new Point((point0.X + point1.X) / 2, (point0.Y + point1.Y) / 2);
image.RenderTransformOrigin = new Point(midpoint.X / image.ActualWidth, midpoint.Y / image.ActualHeight);
initialAngle = transform.Rotation;
initialScale = transform.ScaleX;
image.Opacity = 0.8;
}
private void OnPinchDelta(object sender, PinchGestureEventArgs e)
{
transform.Rotation = initialAngle + e.TotalAngleDelta;
transform.ScaleX = transform.ScaleY = initialScale * e.DistanceRatio;
}
private void OnPinchCompleted(object sender, PinchGestureEventArgs e)
{
image.Opacity = 1.0;
}
private void OnFlick(object sender, FlickGestureEventArgs e)
{
flickData.Text = string.Format("{0} Flick: Angle {1} Velocity {2},{3}",
e.Direction, Math.Round(e.Angle), e.HorizontalVelocity, e.VerticalVelocity);
}
}
它对于小图像(小于2000x2000像素)效果很好。但在我的示例中,我有这张巨大的地铁地图(http://www.vasttrafik.se/upload/Linjekartor_hogupplost/Goteborg2010/Linjen%C3%A4tskarta-101212.png或向量http://www.vasttrafik.se/upload/Linjekartor_hogupplost/Goteborg2010/Linjen%C3%A4tskarta-101212.pdf)。如果用户能够缩放矢量图像将更加美观,但是导入如此巨大的矢量图形会引起严重的性能问题。
也许我可以将图像分成几个“多尺度图像”,并使用此http://dotnetbyexample.blogspot.com/2010/08/windows-phone-7-multi-touch-panzoom.html,但我真的不知道如何使用他的类:(
有什么想法吗?你们怎么解决这个问题?
谢谢
理查德