本文介绍了在按钮上画一条线单击的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想让用户画一条线,就像我们在绘画应用程序中画线一样,这是我的代码
MainWindow.xaml的xaml代码
I want to let user draw a line like we draw in a paint application following is my code
xaml code for MainWindow.xaml
<Window x:Class="LineWPF.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<DockPanel LastChildFill="True">
<Button Name="buttonToolLine" DockPanel.Dock="Top" Height="41" MouseDown="buttonToolLine_MouseDown" MouseMove="buttonToolLine_MouseMove">Line</Button>
<Canvas Name="DrawingCanvas"></Canvas>
</DockPanel>
</Window>
以下是我背后的代码MainWindow.xaml.cs
Following is my behind the code MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
namespace LineWPF
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
Point StartPoint;
Point EndPoint;
Line CurrentLine;
public MainWindow()
{
InitializeComponent();
}
void buttonToolLine_MouseDown(object sender, MouseButtonEventArgs e)
{
StartPoint = e.GetPosition(DrawingCanvas);
}
void buttonToolLine_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
EndPoint = e.GetPosition(DrawingCanvas);
DrawLine(StartPoint, EndPoint, DrawingCanvas);
}
}
void DrawLine(Point From, Point To, Canvas TargetCanvas)
{
CurrentLine = new Line();
CurrentLine.StrokeEndLineCap = PenLineCap.Round;
CurrentLine.StrokeStartLineCap = PenLineCap.Round;
CurrentLine.Stroke = Brushes.Red;
CurrentLine.StrokeThickness = 2.0;
CurrentLine.X1 = From.X;
CurrentLine.Y1 = From.Y;
CurrentLine.X2 = To.X;
CurrentLine.Y2 = To.Y;
Canvas.SetLeft(TargetCanvas, From.X);
Canvas.SetTop(TargetCanvas, From.Y);
TargetCanvas.Children.Add(CurrentLine);
}
}
}
我在这里错过了什么,当我调试时也没有击中mousedown事件,仍然是编码中的新功能,尤其是WPF和图形中的新功能,请帮助
What did I missed here, The mousedown event is also not hit when I debug, Still new in coding and specially in WPF and graphics please help
推荐答案
<DockPanel LastChildFill="True">
<Button Name="buttonToolLine" DockPanel.Dock="Top" Height="41" >Line</Button>
<Canvas Name="DrawingCanvas" MouseDown="DrawingCanvas_MouseDown" MouseLeave="DrawingCanvas_MouseLeave"></Canvas>
</DockPanel>
并且即使没有命中,代码背后的代码也发生了变化
and the code behind code also changed still the even is not hit
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