我想画动画,飞机从左到右穿过。

public partial class Form1 : Form
{
    Bitmap sky, plane, background;
    int currentX, currentY;
    Random rndHeight;
    Rectangle planeRect;
    Graphics g;

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        try
        {
            sky = new Bitmap("sky.jpg");
            plane = new Bitmap("plane1.png");

            int planeWidth = plane.Width; int planeHeight = plane.Height;
        }
        catch (Exception) { MessageBox.Show("No files!"); }

        this.ClientSize = new System.Drawing.Size(sky.Width, sky.Height);
        this.FormBorderStyle = FormBorderStyle.FixedSingle;

        background = new Bitmap(sky);
        g = Graphics.FromImage(background);

        rndHeight = new Random();
        currentX = -plane.Width; currentY = rndHeight.Next(0, this.Height);

        this.BackgroundImage = background;

        timer1.Interval = 1;
        timer1.Enabled = true;
        timer1.Start();
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        e.Graphics.DrawImage(sky, 0, 0);
        e.Graphics.DrawImage(plane, planeRect);
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        g.DrawImage(sky, 0, 0);
        planeRect.X = currentX; planeRect.Y = currentY; planeRect.Width = plane.Width; planeRect.Height = plane.Height;
        g.DrawImage(plane, planeRect);
        Rectangle myNewPlane = new Rectangle(planeRect.X - 10, planeRect.Y - 10, planeRect.Width + 20, planeRect.Height + 20);
        this.Invalidate(myNewPlane);
        if (currentX >= this.Width) currentX = -plane.Width; else currentX += 2;
        currentY += rndHeight.Next(-2, 2);
    }
}


这段代码有效,但是平面的Rectangle以timer1.Interval的频率闪烁。我的问题是:如何避免这些闪烁?

ps:背景图片分辨率为1024x768;平面-160x87。飞机是透明的

最佳答案

您可以通过为表单设置DoubleBuffering样式以消除闪烁来解决此问题,例如

DoubleBuffered = true;


您可能还想为自动双缓冲设置更多的控件样式(在InitializeComponents之后)

this.SetStyle(
  ControlStyles.AllPaintingInWmPaint |
  ControlStyles.UserPaint |
  ControlStyles.DoubleBuffer,true);


有关自动和手动双缓冲的更多信息,请参见MSDN here

关于c# - winForm invalidate(矩形),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/17772433/

10-12 12:36
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