Question

所以我在C＃中制作一个绘画应用程序，它通过在用户点击绘画面板时标记一个点来工作，然后当用户将鼠标移动到鼠标时用鼠标向下绘制一条线新职位;我学习C＃所以它非常基础。现在一切都很好，直到我把笔放大，当我这样做时，线条开始显得超级奇怪？有没有人知道任何可能的解决方案，使线看起来正常？

Weird Lines

这是我的代码，我使用的是Windows窗体应用：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.VisualBasic;
using System.Drawing.Drawing2D;

namespace paintApplication
{

    public partial class frmPaintApp : Form
    {
        /// <summary>
        /// variables
        /// </summary>
        bool shouldPaint = false;
        Point prePoint;
        float penSize = 1;
        Graphics g;

        ColorDialog cd = new ColorDialog();

        public frmPaintApp()
        {
            InitializeComponent();
            g = pnlPaintPanel.CreateGraphics();
            g.SmoothingMode = SmoothingMode.AntiAlias;
        }

        private void msPensize_Click(object sender, EventArgs e)
        {

            if (float.TryParse(msTxtchoosesize.Text , out penSize))
            {
                msTxtchoosesize.Text = "";
            }
        }

        private void pnlPaintPanel_MouseDown(object sender, MouseEventArgs e)
        {
            shouldPaint = true;
            prePoint = new Point(e.X, e.Y);
        }

        private void pnlPaintPanel_MouseUp(object sender, MouseEventArgs e)
        {
            shouldPaint = false;
        }

        private void pnlPaintPanel_MouseMove(object sender, MouseEventArgs e)
        {
            Pen p = new Pen(cd.Color, penSize);


            if (shouldPaint == true)
            {
                g.DrawLine(p, prePoint, new Point(e.X, e.Y));
            }

            prePoint = new Point(e.X, e.Y);

        }

        private void msChoosecolor_Click(object sender, EventArgs e)
        {
            cd.ShowDialog();
        }

        private void frmPaintApp_ResizeEnd(object sender, EventArgs e)
        {
            g = pnlPaintPanel.CreateGraphics();
            g.SmoothingMode = SmoothingMode.AntiAlias;
        }

        private void msClear_Click(object sender, EventArgs e)
        {
            g.Clear(pnlPaintPanel.BackColor);

        }

        private void msExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void pnlPaintPanel_Paint(object sender, PaintEventArgs e)
        {

        }
    }
}

Answer 1

除了我关于使用CreateGraphics等的评论之外，请尝试更改LineCaps（并处理你的笔，你的内存泄漏）：

using (Pen p = new Pen(Color.Black, penSize)) {
  p.StartCap = LineCap.Round;
  p.EndCap = LineCap.Round;
  if (shouldPaint) {
    g.DrawLine(p, prePoint, new Point(e.X, e.Y));
  }
}

如何制作更好的线条？

1 个答案: