Silverlight实用窍门系列：29.Silverlight碰撞测试、检测自定义控件碰撞，雷达扫描图之扫描雷达点状态【附带源码实例】

public MainPage()
{
InitializeComponent();

AddCanvasTransform();
}
RandarPointer rpointer = new RandarPointer();
public void AddCanvasTransform()
{


AddDevice();
// 设置一个50毫秒启动一次的定时器
time = new Timer(CheckIsContent, rpointer, 0 , 50 );


}
private void AddDevice()
{
#region 添加闪动的设备
LayoutRoot.Children.Clear();
// 添加雷达指针
LayoutRoot.Children.Add(rpointer);
for ( int i = 0 ; i < 15 ; i ++ )
{
Device dev = new Device();
// 设置X、Y坐标和Z层次
dev.SetValue(Canvas.TopProperty, dev.Y);
dev.SetValue(Canvas.LeftProperty, dev.X);

// 设置 dev.Tag为控件的左上角的点坐标和右下角的点坐标
double DevRight = dev.X + 16 ;
double DevButtom = dev.Y + 16 ;
dev.SetValue(Canvas.ZIndexProperty, 600 );
dev.Tag = dev.X + " | " + dev.Y + " | " + DevRight + " | " + DevButtom;
LayoutRoot.Children.Add(dev);
}
#endregion
}
// 添加一个Timer定时器检测当前的指针的位置。
Timer time;
public void CheckIsContent( object state)
{
this .rpointer.Dispatcher.BeginInvoke( new labelDelegete(UpdateLab));


}
public delegate void labelDelegete();
public void UpdateLab()
{
Rectangle rectangle = rpointer.FindName( " rectangle " ) as Rectangle;
// 获取到当前雷达指针的左上角点的位置和右下角点的位置，赋值给Tag
double top = - Math.Sin(rpointer.rTransform.Angle) * 253 + 300 ;
double left = - Math.Cos(rpointer.rTransform.Angle) * 253 + 300 ;
double right = 300 ;
double buttom = 300 ;
rpointer.Tag = left + " | " + top + " | " + right + " | " + buttom;

// 循环获取所有的Device控件的位置和当前时间雷达指针是否碰撞
foreach (UIElement ui in LayoutRoot.Children)
{
Device device = ui as Device;
if (device != null )
{
Rectangle rectangleblue = device.Rectangleblue;
// 检测雷达指针是否碰撞到设备，
if (CheckCollision(device, rectangleblue, rpointer, rectangle))
{
// 检测设备CPU占用值是否大于60%，如果大于则报警
if (device.Value > 60 )
{
// 让其显示为红色
device.IsOutStrip = true ;
}
}
}
}
}
/// <summary>
/// 检查控件的位置是否碰撞在一起
/// </summary>
/// <param name="control1"> 第一用户控件 </param>
/// <param name="controlElem1"> 第一用户控件内部需要检测是否碰撞的控件 </param>
/// <param name="control2"> 第二用户控件 </param>
/// <param name="controlElem2"> 第二用户控件内部需要检测是否碰撞的控件 </param>
/// <returns></returns>
private bool CheckCollision(FrameworkElement control1, FrameworkElement controlElem1, FrameworkElement control2, FrameworkElement controlElem2)
{
// 创建两个Rect结构
Rect rect1 = UserControlBounds(control1);
Rect rect2 = UserControlBounds(control2);

// 检测这两个Rect结构是否重合
rect1.Intersect(rect2);
if (rect1 == Rect.Empty)
{
// no collision - GET OUT!
return false ;
}
else
{
bool bCollision = false ;
Point ptCheck = new Point();

// 更精准的像素级别的碰撞对比
for ( int x = Convert.ToInt32(rect1.X); x < Convert.ToInt32(rect1.X + rect1.Width); x ++ )
{
for ( int y = Convert.ToInt32(rect1.Y); y < Convert.ToInt32(rect1.Y + rect1.Height); y ++ )
{
ptCheck.X = x;
ptCheck.Y = y;

List < UIElement > hits = System.Windows.Media.VisualTreeHelper.FindElementsInHostCoordinates(ptCheck, control1) as List < UIElement > ;
if (hits.Contains(controlElem1))
{
// we have a hit on the first control elem, now see if the second elem has a similar hit
List < UIElement > hits2 = System.Windows.Media.VisualTreeHelper.FindElementsInHostCoordinates(ptCheck, control2) as List < UIElement > ;
if (hits2.Contains(controlElem2))
{
bCollision = true ;
break ;
}
}
}
if (bCollision) break ;
}
return bCollision;
}
}
/// <summary>
/// 根据需要检测的控件的坐标位置，绘制出需要检测控件的副本Rect控件
/// </summary>
/// <param name="control"></param>
/// <returns></returns>
public Rect UserControlBounds(FrameworkElement control)
{
// 重新创建一个Rect结构。
string [] PointDirect = control.Tag.ToString().Split( ' | ' );
Point ptTopLeft = new Point(Convert.ToDouble(PointDirect[ 0 ]), Convert.ToDouble(PointDirect[ 1 ]));
Point ptBottomRight = new Point(Convert.ToDouble(PointDirect[ 2 ]), Convert.ToDouble(PointDirect[ 3 ]));

return new Rect(ptTopLeft, ptBottomRight);
}