我需要帮助来限制边界中的路径或画布。我想要的是，当我单击鼠标左键时，按住它并移动以进行平移。当鼠标指针到达BORDER的某个边界时，它不应该移动。我在这里添加代码请帮帮我 XAML代码：
<Border x:Name="OutMoastBorder" Height="820" Width="820" ClipToBounds="True" BorderThickness="2" BorderBrush="Black" Block.IsHyphenationEnabled="True">
<Border x:Name="clipBorder" Height="810" Width="810" BorderThickness="2" BorderBrush="Black" ClipToBounds="True">
<Canvas x:Name="CanvasPanel" Height="800" Width="800" Background="Beige">
</Canvas>
</Border>
</Border>
<Grid>
<Button Content="Original Size" Height="23" Name="btn_Original" Width="75" Click="btn_Original_Click" Margin="4,4,921,973" />
<TextBox Height="23" HorizontalAlignment="Left" Margin="4,59,0,0" Name="txtNoOfZones" VerticalAlignment="Top" Width="120" MaxLength="2" PreviewTextInput="txtNoOfZones_PreviewTextInput" />
<Label Content="Enter a number below for No. of Zones" Height="28" HorizontalAlignment="Left" Margin="4,33,0,0" Name="label1" VerticalAlignment="Top" Width="220" FontFamily="Vijaya" FontSize="15" FontWeight="Bold" FontStyle="Normal" />
<Button Content="Zones" Height="23" HorizontalAlignment="Left" Margin="130,58,0,0" Name="btnNoOfZones" VerticalAlignment="Top" Width="41" Click="btnNoOfZones_Click" />
</Grid>
</Grid>
缩放和平移的代码：
void Zoom_MouseWheel(object sender, MouseWheelEventArgs e)
{
Point p = e.MouseDevice.GetPosition(((Path)sender));
Matrix m = CanvasPanel.RenderTransform.Value;
if (e.Delta > 0)
m.ScaleAtPrepend(1.1, 1.1, p.X, p.Y);
else
m.ScaleAtPrepend(1 / 1.1, 1 / 1.1, p.X, p.Y);
CanvasPanel.RenderTransform = new MatrixTransform(m);
// CanvasPanel.RenderTransformOrigin = new Point(0.5, 0.5);
}
private Point origin;
private Point start;
void Pan_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (((Path)sender).IsMouseCaptured) return;
((Path)sender).CaptureMouse();
start = e.GetPosition(clipBorder);
origin.X = CanvasPanel.RenderTransform.Value.OffsetX;
origin.Y = CanvasPanel.RenderTransform.Value.OffsetY;
}
void Pan_MouseLeftBtnUp(object sender, MouseButtonEventArgs e)
{
((Path)sender).ReleaseMouseCapture();
}
void Pan_MouseMove(object sender, MouseEventArgs e)
{
if (!((Path)sender).IsMouseCaptured) return;
Point p = e.MouseDevice.GetPosition(clipBorder);
Matrix m = CanvasPanel.RenderTransform.Value;
m.OffsetX = origin.X + (p.X - start.X);
m.OffsetY = origin.Y + (p.Y - start.Y);
CanvasPanel.RenderTransform = new MatrixTransform(m);
}
private const int NoOfSectors = 180;
private const int NoOfZones = 5;
void OnLoaded(object sender, RoutedEventArgs args)
{
const double PIES = 2 * Math.PI / NoOfSectors;
Point center = new Point(CanvasPanel.ActualWidth / 2, CanvasPanel.ActualHeight / 2); // center (x,y) Co-ordinates to get center of canvas
double radius = 0.1 * Math.Min(CanvasPanel.ActualWidth, CanvasPanel.ActualHeight);
for (int s = 0; s <= NoOfSectors; s++)
{
for (int z = 1; z <= NoOfZones; z++)
{
Path path = new Path();
PathGeometry pathGeo = new PathGeometry();
PathFigure pathFig = new PathFigure();
double radians = 2 * Math.PI * s / NoOfSectors;
double outerRadius = radius * z;
double innerRadius = radius * ((z - 1));
Size outerArcSize = new Size(outerRadius, outerRadius);
Size innerArcSize = new Size(innerRadius, innerRadius);
Point p1_1st_LineSegment; //------------------------------> Points variable, to store each iterate point in these.
Point p2_1st_ArcSegment;
Point p3_2nd_LineSegment;
Point p4_2nd_ArcSegment;
p1_1st_LineSegment = new Point(center.X + innerRadius * Math.Cos(radians - PIES), center.Y - innerRadius * Math.Sin(radians - PIES)); // point for LINE from Center
p2_1st_ArcSegment = new Point(center.X + innerRadius * Math.Cos(radians), center.Y - innerRadius * Math.Sin(radians)); // point for ARC after the 1st LINE formation
p3_2nd_LineSegment = new Point(center.X + outerRadius * Math.Cos(radians), center.Y - outerRadius * Math.Sin(radians)); // Point for 2nd LINE after forming both LINE abd ARC
p4_2nd_ArcSegment = new Point(center.X + outerRadius * Math.Cos(radians - PIES), center.Y - outerRadius * Math.Sin(radians - PIES)); // Point for 2nd ARC which is Counter-CLockwise that closes a path
pathFig.StartPoint = center;
pathFig.Segments.Add(new LineSegment(p1_1st_LineSegment, true));
pathFig.Segments.Add(new ArcSegment(p2_1st_ArcSegment, innerArcSize, 1, false, SweepDirection.Clockwise, true));
pathFig.Segments.Add(new LineSegment(p3_2nd_LineSegment, true));
pathFig.Segments.Add(new ArcSegment(p4_2nd_ArcSegment, outerArcSize, 1, false, SweepDirection.Counterclockwise, true));
pathFig.IsClosed = false; //false because, path has to be close with ARC, not with LINE
pathFig.IsFilled = true;
pathGeo.Figures.Add(pathFig); // binding data to a Geometry
pathGeo.FillRule = FillRule.Nonzero;
path.Data = pathGeo; // binding whole geometry data to a path
path.Stroke = Brushes.Black;
path.Fill = Brushes.Silver;
path.StrokeThickness = 0.1;
// CanvasPanel.RenderTransformOrigin = new Point(0.5, 0.5); //--------------------> this makes "Canvas" to be Zoom from center
CanvasPanel.Children.Add(path); // binding to a CanvasPanel as a children
path.MouseLeftButtonDown += MouseLeftButtonClick; // calling Mouse-click-event
path.MouseWheel += Zoom_MouseWheel;
path.MouseLeftButtonDown += Pan_MouseLeftButtonDown;
path.MouseLeftButtonUp += Pan_MouseLeftBtnUp;
path.MouseMove += Pan_MouseMove;
}
}
请帮帮我。
此致
Viswanath。
答案 0 :(得分：0)
PLz用后面的代码中的以下代码替换MouseMove事件。
void Pan_MouseMove(object sender, MouseEventArgs e)
{
if (!((Path)sender).IsMouseCaptured) return;
Point p = e.MouseDevice.GetPosition(clipBorder);
if (p.X > 0 && p.Y > 0 && p.X < clipBorder.ActualWidth && p.Y < clipBorder.ActualHeight)
{
Matrix m = CanvasPanel.RenderTransform.Value;
m.OffsetX = origin.X + (p.X - start.X);
m.OffsetY = origin.Y + (p.Y - start.Y);
CanvasPanel.RenderTransform = new MatrixTransform(m);
}
}
我已经测试过，这肯定会解决这个问题。 问候， Viswa