标签: onpaint

正如主题行所解释的那样。

我想在 .NET 中 Button 控件的 Image 属性中实现ImageAlign.MiddleCenter行为

我正在重写按钮的 OnPaint 事件。我使用e.Graphics.DrawImage(Image,oDrawRectagle); 在 Button 控件内绘制图像。然而，它总是出现在按钮的左侧。由于 oDrawRectagle 始终返回 ClientRectangle 的 0,0 坐标。

我希望图像始终对齐ImageAlign.MiddleCenter。我该如何实现它？

谢谢

  protected override void  OnPaint(PaintEventArgs e)
            {
                 Graphics g = e.Graphics;

                 int iHeight;
                 int iWidth;

                 if (Image != null)
                 {
                     //newSize = MaintainAspectRatio(Image, ClientRectangle.Width, ClientRectangle.Height);
                     //iHeight = newSize.Height;
                     //iWidth = newSize.Width;
                     Rectangle ResizedRectangle = MaintainAspectRatio(Image,ClientRectangle);
                     iHeight = ResizedRectangle.Height;
                     iWidth = ResizedRectangle.Width;

                 }
                 else
                 {
                     iWidth = ClientRectangle.Width;
                     iHeight = ClientRectangle.Height;
                 }

                 g.FillRectangle(new SolidBrush(Color.FromArgb(213, 221, …

我想在 PictureBox 中绘制一些小图片（连续 4 x 32px 图像），所以我应该覆盖 OnPaint 方法还是需要制作扩展 PictureBox 的新组件？我试过这个，它在 Java 中工作，但不是在这里：

        this.pictureBox1 = new System.Windows.Forms.PictureBox()
        {
            protected override void OnPaint(PaintEventArgs e)
            {
               // If there is an image and it has a location, 
               // paint it when the Form is repainted.
                Graphics g = e.Graphics;

                // Draw a string on the PictureBox.
                g.DrawString("Test, is that working?",
                new Font("Arial", 10), System.Drawing.Brushes.Blue, new Point(30, 30));
             }
        }

InitializeComponent 方法的完整代码：

   private void InitializeComponent()
    {
        System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Tools));
        this.pictureBox1 = …

我想创建一个带有圆角和渐变颜色的自定义组合框。我Button通过重写OnPaint方法实现了相同的功能。但是它不起作用ComboBox。任何帮助将不胜感激。

OnPaint下面给出了我用于覆盖的代码：

protected override void OnPaint(PaintEventArgs paintEvent)
{
     Graphics graphics = paintEvent.Graphics;

     SolidBrush backgroundBrush = new SolidBrush(this.BackColor);
     graphics.FillRectangle(backgroundBrush, ClientRectangle);

     graphics.SmoothingMode = SmoothingMode.AntiAlias;

     Rectangle rectangle = new Rectangle(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width - 1, ClientRectangle.Height - 1);
     GraphicsPath graphicsPath = RoundedRectangle(rectangle, cornerRadius, 0);
     Brush brush = new LinearGradientBrush(rectangle, gradientTop, gradientBottom, LinearGradientMode.Horizontal);
     graphics.FillPath(brush, graphicsPath);

     rectangle = new Rectangle(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width - 1, ClientRectangle.Height - 100);
     graphicsPath = RoundedRectangle(rectangle, cornerRadius, 2);
     brush = new LinearGradientBrush(rectangle, gradientTop, gradientBottom, LinearGradientMode.Horizontal); …

我正在尝试改进我的应用程序并提高它的性能.基本上,它是一个高级的Graph-class.它绘制了几行并刷新它们.

在确定了几个慢点之后,我想对我的结果进行基准测试.我的绘图卡在~65 FPS(这是完美的,但我是基准测试).我在一个计时器(设置为1毫秒)中使我的对象无效,并使用受保护的覆盖void OnPaint - "way"重绘我的东西.

之后,我将Invalidate()放入受保护的覆盖void OnPaint中.事后FPS设定为几千.但使用该方法将导致空屏幕.

我的问题是:这个问题是故意的吗？这是有道理的,因为高于屏幕刷新率的任何东西都是浪费的力量.但我想为我的基准测试禁用"锁定".

示例代码:

//Timer to refresh
private void timer1_Tick(object sender, EventArgs e)
    {
        Invalidate();
    }

private DateTime date = DateTime.UtcNow;
    private long times = 0;
    protected override void OnPaint(PaintEventArgs e)
    {

        base.OnPaint(e);

        //Drawing
        e.Graphics.DrawLine(new Pen(Brushes.Black), 50, 50, Width - 100, Height - 100);

        //Required to tell me the framerate
        if ((DateTime.UtcNow - date).Seconds > 1)
        {
            date = DateTime.UtcNow;
            Debug.WriteLine(times);
            times = 0;
        }

        times++;
    }

谢谢

史蒂夫〜

我模拟地图导航并在面板上绘制生成的地图部分.由于图像闪烁,我必须使用双缓冲.

这是我的面板代码:

public class MapPanel : System.Windows.Forms.Panel
    {
        public MapPanel()
        {
            DoubleBuffered = true;
            ResizeRedraw = true;
        }
    }

我有以下方法:

public void panelMap_Paint(object sender, PaintEventArgs e)
        {
            using (Graphics g = e.Graphics)
            {
                g.DrawImage(mapController.GetCurrentMap(), 0, 0, panelMap.Width, panelMap.Height);
            }
        }

我不是在说这种方法.我在.Designer.cs中有以下代码:

this.panelMap.Paint += new PaintEventHandler(this.panelMap_Paint);

并在MouseMove中调用Invalidate().我确定发生了这个事件,我已经检查过了.一切似乎都是正确的.

然后图像没有绘制.我的意思是,面板是空的,似乎是透明的或者是默认的控件颜色.但是,如果我关闭双缓冲,图像被正确绘制,但显然,它是闪烁的.你可以帮帮我吗？

我有一个从支票簿派生的控件,我称之为"SettingBooleanButton",但是当任何窗口或对话框被拖动到控件上时,控件会保持拖动的迹象

下一个图像显示了将应用程序窗口拖动到控件上的效果

这是我对OnPaint()的代码块

Public Class SettingBooleanButton
    Inherits CheckBox

    Private _settingSection As String
    Private _settingName As String
    Private _associatedSetting As Setting

    Public Event StateChange(ByVal affectedSetting As Setting)

    Sub New()
        ' This call is required by the designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.
        Appearance = Appearance.Button
        FlatStyle = FlatStyle.Flat
        TextAlign = ContentAlignment.MiddleCenter
        AutoSize = False
    End Sub

    Public Property SettingSection As String
        Get
            Return _settingSection
        End Get
        Set(value As String)
            _settingSection = value
        End Set
    End Property

    Public …