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/