我正在编写一个WPF应用程序,它具有缩放和平移功能,但我想实现的是通过单击按钮“自动”缩放和平移。
我已经定义了所有缩放和平移的方法,但我无法告诉应用程序所需的平移X/Y坐标。
基本上,我知道我希望控件在所需的缩放级别下居中(比如6倍缩放),但是平移目标点不是控件的中心点,因为在缩放后,它已经被缩放了。
是否有人知道一种计算要平移到的所需X/Y位置的方法,同时考虑到缩放? 我只需要对所需的目标点进行缩放吗? 但这对我似乎不起作用...
非常感谢
编辑--已完成--
现在这就是我拥有的可以正常工作的代码 :)
<Canvas x:Name="LayoutRoot" Background="{DynamicResource WindowBackground}" Width="1024" Height="768">
<Canvas x:Name="ProductCanvas" Width="1024" Height="768">
<Canvas.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform />
</TransformGroup>
</Canvas.RenderTransform>
<Rectangle x:Name="r1" Fill="White" Stroke="Black" Width="180" Height="103.5" Canvas.Left="131.5" Canvas.Top="121.5" MouseDown="r1_MouseDown"/>
<Rectangle x:Name="r2" Fill="#FF942222" Stroke="Black" Width="180" Height="103.5" Canvas.Left="617.5" Canvas.Top="121.5" MouseDown="r2_MouseDown"/>
<Rectangle x:Name="r3" Fill="#FF2B1E9F" Stroke="Black" Width="180" Height="103.5" Canvas.Left="131.5" Canvas.Top="408" MouseDown="r3_MouseDown"/>
<Rectangle x:Name="r4" Fill="#FF1F6E1D" Stroke="Black" Width="180" Height="103.5" Canvas.Left="617.5" Canvas.Top="408" MouseDown="r4_MouseDown"/>
</Canvas>
</Canvas>
----C#----
private void r1_MouseDown(object sender, MouseButtonEventArgs e1)
{
Rect bounds = r1.TransformToAncestor(ProductCanvas).TransformBounds(new Rect(0, 0, r1.ActualWidth, r1.ActualHeight));
ZoomInAndPan(5, new Point(bounds.TopLeft.X + (bounds.Width / 2), bounds.TopLeft.Y + (bounds.Height / 2)));
}
private void r2_MouseDown(object sender, MouseButtonEventArgs e1)
{
Rect bounds = r2.TransformToAncestor(ProductCanvas).TransformBounds(new Rect(0, 0, r2.ActualWidth, r2.ActualHeight));
ZoomInAndPan(5, new Point(bounds.TopLeft.X + (bounds.Width / 2), bounds.TopLeft.Y + (bounds.Height / 2)));
}
private void r3_MouseDown(object sender, MouseButtonEventArgs e1)
{
Rect bounds = r3.TransformToAncestor(ProductCanvas).TransformBounds(new Rect(0, 0, r3.ActualWidth, r3.ActualHeight));
ZoomInAndPan(5, new Point(bounds.TopLeft.X + (bounds.Width / 2), bounds.TopLeft.Y + (bounds.Height / 2)));
}
private void r4_MouseDown(object sender, MouseButtonEventArgs e1)
{
Rect bounds = r4.TransformToAncestor(ProductCanvas).TransformBounds(new Rect(0, 0, r4.ActualWidth, r4.ActualHeight));
ZoomInAndPan(5, new Point(bounds.TopLeft.X + (bounds.Width/2), bounds.TopLeft.Y + (bounds.Height/2)));
}
public void ZoomInAndPan(double zoomTo, Point translateTarget)
{
var group = (ProductCanvas.RenderTransform as TransformGroup);
var zoomTransform = group.Children[0] as ScaleTransform;
var translateTransform = group.Children[3] as TranslateTransform;
Point center = new Point(512, 384);
destinationPoint.X *= newScale;
destinationPoint.Y *= newScale;
var deltaX = center.X - (translateTarget.X);
var deltaY = center.Y - (translateTarget.Y);
translateTransform.BeginAnimation(TranslateTransform.XProperty, CreateZoomAnimation(deltaX));
translateTransform.BeginAnimation(TranslateTransform.YProperty, CreateZoomAnimation(deltaY));
zoomTransform.BeginAnimation(ScaleTransform.ScaleXProperty, CreateZoomAnimation(zoomTo));
zoomTransform.BeginAnimation(ScaleTransform.ScaleYProperty, CreateZoomAnimation(zoomTo));
}
private DoubleAnimation CreateZoomAnimation(double toValue)
{
var da = new DoubleAnimation(toValue, new Duration(TimeSpan.FromMilliseconds(700)))
{
AccelerationRatio = 0.1,
DecelerationRatio = 0.9
};
return da;
}