C＃绘制程序闪烁 [英] C# paint program flickering

问题描述

我试图在C＃中制作一个简单的绘图程序，但是当我绘图时它会一直闪烁，就像我需要某种双缓冲，但我不知道该怎么做。

我正在使用 Panel ，并使用位图以存储图形。

以下是我的代码：

  public partial类Form1：表单
 {
私有位图图形; 
 private bool leftDown = false; 
 private int prevX; 
 private int prevY; 
 private int currentX; 
 private int currentY; 
 
 public Form1（）
 {
 InitializeComponent（）; 
 
 drawing = new Bitmap（panel1.Width，panel1.Height）; 
} 
 
 private void panel1_MouseDown（object sender，MouseEventArgs e）
 {
 if（e.Button == MouseButtons.Left）
 {
 leftDown = true; 
 
 prevX = e.X; 
 prevY = e.Y; 
 
 
 $ b $ private void panel1_MouseMove（object sender，MouseEventArgs e）
 {
 if（leftDown）
 {
 Graphics g = Graphics.FromImage（drawing）; 
 
 currentX = e.X; 
 currentY = e.Y; 
 
 g.DrawLine（new Pen（Color.Black），new Point（currentX，currentY），new Point（prevX，prevY））; 
 panel1.Invalidate（）; 
 
 prevX = currentX; 
 prevY = currentY; 
 
 g.Dispose（）; 
 
 
 
 private void panel1_MouseUp（object sender，MouseEventArgs e）
 {
 leftDown = false; 
} 
 
 private void panel1_MouseLeave（object sender，EventArgs e）
 {
 leftDown = false; 
 
 $ b $ private void panel1_Paint（object sender，PaintEventArgs e）
 {
 e.Graphics.DrawImageUnscaled（drawing，0，0）; 
 
 
 
 $ div $解析方案

你不仅要将 DoubleBuffered 转换为 true ，还要使用 PictureBox 而不是面板并绘制它。这应该解决您的问题：）。

I'm trying to make a simple paint program in C#, but it keeps flickering when I'm drawing, like I need some kind of double buffering, but I don't know how to do it.

I am drawing on a Panel and I'm using a Bitmap to store the graphics.

Here's my code:

public partial class Form1 : Form
{
    private Bitmap drawing;
    private bool leftDown = false;
    private int prevX;
    private int prevY;
    private int currentX;
    private int currentY;

    public Form1()
    {
        InitializeComponent();

        drawing = new Bitmap(panel1.Width, panel1.Height);
    }

    private void panel1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            leftDown = true;

            prevX = e.X;
            prevY = e.Y;
        }
    }

    private void panel1_MouseMove(object sender, MouseEventArgs e)
    {
        if (leftDown)
        {
            Graphics g = Graphics.FromImage(drawing);

            currentX = e.X;
            currentY = e.Y;

            g.DrawLine(new Pen(Color.Black), new Point(currentX, currentY), new Point(prevX, prevY));
            panel1.Invalidate();

            prevX = currentX;
            prevY = currentY;

            g.Dispose();
        }
    }

    private void panel1_MouseUp(object sender, MouseEventArgs e)
    {
        leftDown = false;
    }

    private void panel1_MouseLeave(object sender, EventArgs e)
    {
        leftDown = false;
    }

    private void panel1_Paint(object sender, PaintEventArgs e)
    {
        e.Graphics.DrawImageUnscaled(drawing, 0, 0);
    }
}

解决方案

You not only should turn DoubleBuffered to true, but also use PictureBox instead of Panel and draw on it. This should solve your issue :).

这篇关于C＃绘制程序闪烁的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！