我的表格中的组框内有一个图片框，其中雷达图片设置为背景图片。我的目的是在运行时动态加载雷达区域内的微小Jpeg图像（重叠），但我不确定实现这一目标的最佳方法。 欢迎所有疯狂的想法（但我更喜欢理智的做法）。 谢谢大家。
答案 0 :(得分：3)
这很大程度上取决于你的“雷达”需要什么样，但几乎可以肯定你需要实现Paint事件处理程序，并自己绘制雷达显示的内容。一个图片框只会让你到目前为止（“不是很”）。
GDI +非常易于用于绘制圆形，线条，文本和图像，并可让您完全控制显示的外观。
答案 1 :(得分：2)
至于实际例子：
// Among others
using System.Collections.Generic;
using System.Drawing;
using System.IO;
class TinyPic {
public readonly Image Picture;
public readonly Rectangle Bounds;
public TinyPic(Image picture, int x, int y) {
Picture = picture;
Bounds = new Rectangle(x, y, picture.Width, picture.Height);
}
}
class MyForm : Form {
Dictionary<String, TinyPic> tinyPics = new Dictionary<String, TinyPic>();
public MyForm(){
InitializeComponent(); // assuming Panel myRadarBox
// with your background is there somewhere;
myRadarBox.Paint += new PaintEventHandler(OnPaintRadar);
}
void OnPaintRadar(Object sender, PaintEventArgs e){
foreach(var item in tinyPics){
TinyPic tp = item.Value;
e.Graphics.DrawImageUnscaled(tp.Picture, tp.Bounds.Location);
}
}
void AddPic(String path, int x, int y){
if ( File.Exists(path) ){
var tp = new TinyPic(Image.FromFile(path), x, y);
tinyPics[path] = tp;
myRadarBox.Invalidate(tp.Bounds);
}
}
void RemovePic(String path){
TinyPic tp;
if ( tinyPics.TryGetValue(path, out tp) ){
tinyPics.Remove(path);
tp.Picture.Dispose();
myRadarBox.Invalidate(tp.Bounds);
}
}
}
这当然是非常基本的，假设图像源是路径，并没有处理许多复杂的事情，但这是你可以建立的快速和肮脏的主题。
答案 2 :(得分：2)
Click here运行一个示例应用程序，演示如何进行雷达（或至少单向）的基础知识。注意：此应用程序不会对微小图像执行双缓冲或透明度。
该项目的源代码是here。
更新代码：
public partial class Form1 : Form
{
private Bitmap _canvas;
private float _sweepStartAngle = -90;
private float _sweepAngle = 15;
private SolidBrush _sweepBrush = new SolidBrush(Color.Red);
private Rectangle _sweepRect;
private Timer _sweepTimer = new Timer();
private Bitmap _submarine;
private Point _submarinePosition = new Point(0, 0);
private Random rnd = new Random();
public Form1()
{
InitializeComponent();
_canvas = new Bitmap(pbScope.Width, pbScope.Height);
pbScope.Image = _canvas;
_sweepRect = new Rectangle(0, 0, pbScope.Width, pbScope.Height);
_submarine = (Bitmap)pbSubmarine.Image;
RedrawScope();
_sweepTimer.Interval = 100;
_sweepTimer.Tick += new EventHandler(_sweepTimer_Tick);
_sweepTimer.Start();
}
void _sweepTimer_Tick(object sender, EventArgs e)
{
_sweepStartAngle += _sweepAngle;
RedrawScope();
}
private void RedrawScope()
{
using (Graphics g = Graphics.FromImage(_canvas))
{
// draw the background
g.DrawImage(pbBackground.Image, 0, 0);
// draw the "sweep"
GraphicsPath piepath = new GraphicsPath();
piepath.AddPie(_sweepRect, _sweepStartAngle, _sweepAngle);
g.FillPath(_sweepBrush, piepath);
//g.FillPie(_sweepBrush, _sweepRect, _sweepStartAngle, _sweepAngle);
// move the submarine and draw it
_submarinePosition.X += rnd.Next(3);
_submarinePosition.Y += rnd.Next(3);
// check if submarine intersects with piepath
Rectangle rect = new Rectangle(_submarinePosition, _submarine.Size);
Region region = new Region(piepath);
region.Intersect(rect);
if (!region.IsEmpty(g))
{
g.DrawImage(_submarine, _submarinePosition);
}
}
pbScope.Image = _canvas;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
_sweepTimer.Stop();
_sweepTimer.Dispose();
}
private void Form1_Load(object sender, EventArgs e)
{
//GraphicsPath piepath = new GraphicsPath();
//piepath.AddPie(
}
}
private void InitializeComponent()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
this.pbScope = new System.Windows.Forms.PictureBox();
this.pbBackground = new System.Windows.Forms.PictureBox();
this.pbSubmarine = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.pbScope)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pbBackground)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pbSubmarine)).BeginInit();
this.SuspendLayout();
//
// pbScope
//
this.pbScope.Location = new System.Drawing.Point(12, 12);
this.pbScope.Name = "pbScope";
this.pbScope.Size = new System.Drawing.Size(300, 300);
this.pbScope.TabIndex = 0;
this.pbScope.TabStop = false;
//
// pbBackground
//
this.pbBackground.Image = ((System.Drawing.Image)(resources.GetObject("pbBackground.Image")));
this.pbBackground.Location = new System.Drawing.Point(341, 12);
this.pbBackground.Name = "pbBackground";
this.pbBackground.Size = new System.Drawing.Size(300, 300);
this.pbBackground.TabIndex = 1;
this.pbBackground.TabStop = false;
this.pbBackground.Visible = false;
//
// pbSubmarine
//
this.pbSubmarine.Image = ((System.Drawing.Image)(resources.GetObject("pbSubmarine.Image")));
this.pbSubmarine.Location = new System.Drawing.Point(658, 45);
this.pbSubmarine.Name = "pbSubmarine";
this.pbSubmarine.Size = new System.Drawing.Size(48, 48);
this.pbSubmarine.TabIndex = 2;
this.pbSubmarine.TabStop = false;
this.pbSubmarine.Visible = false;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(326, 328);
this.Controls.Add(this.pbSubmarine);
this.Controls.Add(this.pbBackground);
this.Controls.Add(this.pbScope);
this.Name = "Form1";
this.Text = "Radar";
this.Load += new System.EventHandler(this.Form1_Load);
this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
((System.ComponentModel.ISupportInitialize)(this.pbScope)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pbBackground)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pbSubmarine)).EndInit();
this.ResumeLayout(false);
}
答案 3 :(得分：0)
最简单的方法是将微小的JPEG加载到微小的PictureBox中，并在运行时将它们添加到主PictureBox的Controls集合中（即将它们放在PictureBox上）。
由于这可能会产生闪烁，稍微复杂的方法是将主图片和小图片保留在类级别的Bitmap对象中，并在主PictureBox的Paint事件中，复制主图片，然后是每张小图片使用DrawImage方法在第二个类级别的Bitmap（名为_doubleBuffer或类似的东西）上，然后将_doubleBuffer复制到PictureBox上（也使用DrawImage）。每当您需要更新显示并重新绘制所有内容时，只需调用PictureBox的Invalidate方法即可。
这里有很多关于如何使用这些方法的示例。祝你好运，这听起来很有趣（如果你正在重写经典的街机游戏Submarine，请告诉我 - 我喜欢那款游戏）。