学步园

今天在论坛看到有人问如何在Win Form上画一个箭头

刚好我也需要用到一些GDI的学习,就把这个当成自己的练习做出来

我的思路很简单,首先利用OnPaint事件,画一个没有动画的箭头

然后再来思考要怎么样让箭头变成动画

我的想法是利用Thread,改变画图座标就可以达成这个效果

同时想到需要在最后才显示两个箭头,那就多了个判断的Flag

再来做一个Loop,让箭头一直画,这样就完成了一个简单的动画

using System;<br /> using System.Collections.Generic;<br /> using System.ComponentModel;<br /> using System.Data;<br /> using System.Drawing;<br /> using System.Linq;<br /> using System.Text;<br /> using System.Windows.Forms;<br /> using System.Threading;</p> <p>namespace WinTest2<br /> {<br /> public partial class Form1 : Form<br /> {<br /> public Form1()<br /> {<br /> InitializeComponent();<br /> }</p> <p> bool isRun;</p> <p> bool isDrawArrow;</p> <p> int lineX = 10;</p> <p> protected override void OnPaint(PaintEventArgs e)<br /> {<br /> base.OnPaint(e);<br /> e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 3), 10, 30, lineX, 30);<br /> if (isDrawArrow)<br /> {<br /> e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 3), 90, 20, 100, 30);<br /> e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 3), 90, 40, 100, 30);<br /> }<br /> }</p> <p> private void Form1_Load(object sender, EventArgs e)<br /> {<br /> Thread t = new Thread(new ThreadStart(Animation));<br /> t.Start();<br /> isRun = true;<br /> isDrawArrow = false;<br /> }</p> <p> void Animation()<br /> {<br /> while (isRun)<br /> {<br /> this.Invalidate();<br /> Thread.Sleep(200);<br /> for (int i = 0; i < 10; i++)<br /> {<br /> lineX = 10 + i * 10;<br /> this.Invalidate();<br /> Thread.Sleep(200);<br /> }<br /> isDrawArrow = true;<br /> this.Invalidate();<br /> Thread.Sleep(2000);<br /> isDrawArrow = false;<br /> }<br /> }</p> <p> private void Form1_FormClosed(object sender, FormClosedEventArgs e)<br /> {<br /> isRun = false;<br /> }<br /> }<br /> }