移动一个矩形围绕画布 [英] Move a rectangle around a canvas
问题描述
我在我与周围的控制应用程序的中间的画布。
我有临危点并以列表保存它们的插座。
I have a canvas in the middle of my application with controls around it. I have a socket that recieves Points and saves them in a list.
我画小4x4的矩形的画布点在我的列表中的号码上。
说theres 4分..那里有4矩形。
I draw small 4x4 rectangles on the canvas for the number of points in my list.. say theres 4 points.. theres 4 rectangles.
我希望能够当点,更改代码,移动矩形。
这是可能没有故事板或任何动画类? ?我怎么会去这样做什么,我需要
I want to be able to move the rectangles when the points change with code. is this possible without storyboards or any 'animation' class? and how would I go about doing what I need?
我曾尝试:
'cMap.Children.Remove(r)
'Dim nr As Rectangle = New Rectangle() With {.Width = 4, .Height = 4, .Name = "r" & P.Name, .Fill = Brushes.Red}
'r.RenderTransform = New TranslateTransform(P.Position.X, P.Position.Y)
Canvas.SetTop(cMap.Children(cMap.Children.IndexOf(r)), (512 / 2) + P.Position.Y)
Canvas.SetLeft(cMap.Children(cMap.Children.IndexOf(r)), (512 / 2) + P.Position.X)
'nr.SetValue(Canvas.TopProperty, (512 / 2) + P.Position.Y)
'nr.SetValue(Canvas.LeftProperty, (512 / 2) + P.Position.X) ' P.Position.X)
'cMap.Children.Add(nr)
所有这些,但没有做的矩形移动。
是的,我已经确保数据被改变。
all of those but none make the rectangles move. and yes I have made sure that the data is changing.
感谢了。
推荐答案
我觉得更漂亮的解决方案都可以通过Canvas.Left和Canvas.Top附加属性绑定到的ObservableCollection <点
>,但当你问一个老式的WinForms风格在这里解决方案,您有什么,做什么,我想你需要(我道歉,在C#编写本):
I think more nifty solutions are available through binding the Canvas.Left and Canvas.Top attached properties to a ObservableCollection<Point
>, but as you asked for an old fashioned WinForms Style solution here you have something that does what I think you need (My apologies for writing this in C#):
XAML:
<Window x:Class="MovingPointsSpike.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="650" Width="525"
>
<StackPanel>
<Border BorderThickness="1" BorderBrush="Gray">
<Canvas Name="PointCanvas" Width="500" Height="500"/>
</Border>
<Button Name="Move" Click="Move_Click">Move Random Point</Button>
<Button Name="Add" Click="Add_Click">Add Point</Button>
<Button Name="Remove" Click="Remove_Click">Remove Random Point</Button>
</StackPanel>
</Window>
后面的代码:
Code behind:
using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
namespace MovingPointsSpike
{
public partial class MainWindow : Window
{
private List<Point> m_Points;
private Random m_Random;
public MainWindow()
{
InitializeComponent();
m_Points=new List<Point>();
m_Random=new Random();
}
private void Move_Click(object sender, RoutedEventArgs e)
{
Rectangle rectangle;
Point newPoint;
int index = GetRandomIndex();
newPoint = GetRandomPoint();
rectangle =(Rectangle)PointCanvas.Children[index];
if (index == -1) return;
Canvas.SetTop(rectangle, newPoint.Y);
Canvas.SetLeft(rectangle, newPoint.X);
}
private void Add_Click(object sender, RoutedEventArgs e)
{
Point newPoint;
Rectangle rectangle;
newPoint = GetRandomPoint();
rectangle = new Rectangle {Width = 4, Height = 4, Fill = Brushes.Red};
m_Points.Add(newPoint);
PointCanvas.Children.Add(rectangle);
Canvas.SetTop(rectangle,newPoint.Y);
Canvas.SetLeft(rectangle,newPoint.X);
}
private Point GetRandomPoint()
{
int x;
int y;
x = m_Random.Next(10, 490);
y = m_Random.Next(10, 490);
return new Point(x,y);
}
private void Remove_Click(object sender, RoutedEventArgs e)
{
int index = GetRandomIndex();
if (index==-1)return;
PointCanvas.Children.RemoveAt(index);
m_Points.RemoveAt(index);
}
private int GetRandomIndex()
{
int index;
if (m_Points.Count==0) return -1;
index = m_Random.Next(m_Points.Count - 1);
return index;
}
}
}
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