接下来插入Window Load事件：
// check to see whether multitouch is enabled
if (IsMultitouchEnabled)
{
// enables stylus events for processor manipulation
Factory.EnableStylusEvents(this);
// add the stylus events
StylusDown += (s, e) =>
{
manipulationProcessor.ProcessDown((uint)e.StylusDevice.Id, e.GetPosition(this).ToDrawingPointF());
};
StylusUp += (s, e) =>
{
manipulationProcessor.ProcessUp((uint)e.StylusDevice.Id, e.GetPosition(this).ToDrawingPointF());
};
StylusMove += (s, e) =>
{
manipulationProcessor.ProcessMove((uint)e.StylusDevice.Id, e.GetPosition(this).ToDrawingPointF());
};
// register the ManipulationDelta event with the manipulation processor
manipulationProcessor.ManipulationDelta += ProcessManipulationDelta;
// set the rotation angle for single finger manipulation
manipulationProcessor.PivotRadius = 2;
}
if (IsMultitouchEnabled)
{
// enables stylus events for processor manipulation
Factory.EnableStylusEvents(this);
// add the stylus events
StylusDown += (s, e) =>
{
manipulationProcessor.ProcessDown((uint)e.StylusDevice.Id, e.GetPosition(this).ToDrawingPointF());
};
StylusUp += (s, e) =>
{
manipulationProcessor.ProcessUp((uint)e.StylusDevice.Id, e.GetPosition(this).ToDrawingPointF());
};
StylusMove += (s, e) =>
{
manipulationProcessor.ProcessMove((uint)e.StylusDevice.Id, e.GetPosition(this).ToDrawingPointF());
};
// register the ManipulationDelta event with the manipulation processor
manipulationProcessor.ManipulationDelta += ProcessManipulationDelta;
// set the rotation angle for single finger manipulation
manipulationProcessor.PivotRadius = 2;
}
在事件处理程序块部分编写你的逻辑，我这里实现了旋转，缩放和图像定位功能，代码如下：
private void ProcessManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
trTranslate.X += e.TranslationDelta.Width;
trTranslate.Y += e.TranslationDelta.Height;
trRotate.Angle += e.RotationDelta * 180 / Math.PI;
trScale.ScaleX *= e.ScaleDelta;
trScale.ScaleY *= e.ScaleDelta;
}
{
trTranslate.X += e.TranslationDelta.Width;
trTranslate.Y += e.TranslationDelta.Height;
trRotate.Angle += e.RotationDelta * 180 / Math.PI;
trScale.ScaleX *= e.ScaleDelta;
trScale.ScaleY *= e.ScaleDelta;
}
小结
从ManipulationDeltaEventArgs你可以得到不同的值，根据这些值你可以在这个块中实现你自己的功能，TranslateTransform实现图像定位，RotateTransform实现图像旋转，ScaleTransform调整图像的大小。现在可以运行你的项目，测试你的第一个多点触摸应用程序。
原文名：Windows 7 Multitouch Application Development (Part - I)
