杭州盘发培训班:WPF几何绘图（二）画矩形

来源：百度文库编辑：偶看新闻时间：2024/04/29 11:50:30

WPF几何绘图（二）画矩形

2009-03-09 11:06 1498人阅读评论(1) 收藏举报

绘制矩形的时候需要使用RectangleGeometry类，代码实例如下:

[c-sharp] view plaincopy?

RectangleGeometry myRectangleGeometry = new RectangleGeometry();
myRectangleGeometry.Rect = new Rect(50,50,25,25);
Path myPath = new Path();
myPath.Fill = Brushes.LemonChiffon;
myPath.Stroke = Brushes.Black;
myPath.StrokeThickness = 1;
myPath.Data = myRectangleGeometry;

矩形的相对位置和尺寸由 Rect 结构定义。相对位置是 50,50，高度和宽度均为 25，这将创建一个正方形。矩形的内部是使用 LemonChiffon 画笔绘制的，它的轮廓是用厚度为 1 的 Black 笔画绘制的。

效果如下：

尽管此示例使用 Path 元素来呈现 RectangleGeometry，但还可以通过许多其他方法来使用 RectangleGeometry 对象。例如，RectangleGeometry 可用于指定 UIElement 的 Clip，或者指定 GeometryDrawing 的 Geometry。

当然如果你要画很多的矩形，比如矩形图表，如上图所示，还是要用到PathGeometry。

最上面我所显示的例子就是使用了PathGeometry，所用代码如下：

[c-sharp] view plaincopy

///
/// Interaction logic for DrawRect.xaml

///

public partial class DrawRect : System.Windows.Window

{

private System.Windows.Threading.DispatcherTimer TimerClock;

public DrawRect()

{

InitializeComponent();

DrawingRect();

//initialize Timer

TimerClock = new System.Windows.Threading.DispatcherTimer();

//Creates a timerClock and enables it

TimerClock.IsEnabled = false;

TimerClock.Tick += new EventHandler(TimerClock_Tick);

checkBox1.Click += new RoutedEventHandler(CheckBox_Checked);

checkBox2.Click += new RoutedEventHandler(CheckBox_Checked);

}

private void CheckBox_Checked(object sender, EventArgs e)

{

//if (((CheckBox)sender).Name == "checkBox1")

//{

TimerClock.Interval = new TimeSpan(0, 0, 1);

if (checkBox1.IsChecked == true)

TimerClock.IsEnabled = true;

else TimerClock.IsEnabled = false;

//}

//else if (((CheckBox)sender).Name == "checkBox2")

//{

// TimerClock.Interval = new TimeSpan(0, 0, 1);

// if (checkBox2.IsChecked == true)

// TimerClock.IsEnabled = true;

// else TimerClock.IsEnabled = false;

//}

}

private void TimerClock_Tick(object sender, EventArgs e)

{

canvas1.Children.Clear();

double y = 150;

PathGeometry aa = new PathGeometry();

for (int i = 0; i < 360; i += 5)

{

double value = i + DateTime.Now.Second;

double h = Math.Sin(value * Math.PI / 180) * 100;

bool isMinus = false;

if (h < 0)

{

isMinus = true;

h = -h;

aa.AddGeometry(new RectangleGeometry(new Rect(50 + i, y, 5, h)));

}

else

aa.AddGeometry(new RectangleGeometry(new Rect(50 + i, y - h, 5, h)));

}

Path myPath = new Path();

myPath.Fill = Brushes.LemonChiffon;

myPath.Stroke = Brushes.Black;

myPath.StrokeThickness = 1;

//myPath.Data = myRectangleGeometry;

myPath.Data = aa;

this.canvas1.Children.Add(myPath);

}

private void DrawingRect()

{