Question

我希望能够将图形绘制到窗体窗口而不是图片框。但是，表单窗口似乎没有捕获mousemove事件。

namespace CollisionTest
    {
        public partial class Form1 : Form
        {
            private Graphics paper;
            private Pen pen;

            public Form1()
            {
                InitializeComponent();
                //paper = pictureBox1.CreateGraphics();
                paper = this.CreateGraphics();
                pen = new Pen(Color.Blue);
                pen.Width = 5;
                this.MouseMove += new System.Windows.Forms.MouseEventHandler(Form1_MouseMove);
            }
            private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
            {
                paper.Clear(Form1.ActiveForm.BackColor);
                paper.DrawRectangle(pen, e.X + 10, this.Height - 20, 50, 10);
            }
        }
    }

Answer 1

paper.Clear方法清除整个绘图表面并使用指定的背景颜色填充它。

因此，当您移动鼠标时，首先清除图形对象并绘制一些东西，这样您就看不到任何东西。测试删除：

paper.Clear(Form1.ActiveForm.BackColor);

来自您的代码

Answer 2

看起来你想要一个＆＃34; pong paddle＆＃34;穿过表格的底部？

只需将this.Height更改为this.ClientRectangle.Height：

public partial class Form1 : Form
{

    private Pen pen;
    private Graphics paper;

    public Form1()
    {
        InitializeComponent();
        pen = new Pen(Color.Blue, 5);
        paper = this.CreateGraphics();
        this.MouseMove += new System.Windows.Forms.MouseEventHandler(Form1_MouseMove);
    }

    private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
    {
            paper.Clear(this.BackColor);
            paper.DrawRectangle(pen, e.X + 10, this.ClientRectangle.Height - 20, 50, 10);
    }

}

表单中的MouseMove事件

2 个答案: