我用GDI画个图形,怎么我选不中它.我想画后选中?

[sky_97]

private void pictureBox1_Click(object sender, EventArgs e)
{
this.pictureBox1.Refresh();
Graphics g = this.pictureBox1.CreateGraphics();
g.DrawRectangle(new Pen(Brushes.White , 20), 20, 20, 20, 20);

[sky_97]

怎么没有人?顶

[sky_97]

没有人说下吗?

[GentleCat]

在MouseDown事件里面加入:

if (Math.Abs(p.X - 2) <= 1 || Math.Abs(p.X - 40) <= 1 ||
    Math.Abs(p.Y - 20) <= 1 || Math.Abs(p.Y - 40) <= 1)
{
    MessageBox.Show("帅哥,你选中你自己画的矩形啦~ 麻烦你画的时候把所有的矩形记录在一个List里面,这样才好判断啊!");
}

[GentleCat]

Math.Abs(p.X - 2) 改为 Math.Abs(p.X - 20)

[seot_chen]

GraphicsPath areaPath;
Pen areaPen;
Region areaRegion;
private void pictureBox1_Click(object sender, EventArgs e)
{
this.pictureBox1.Refresh();
Graphics g = this.pictureBox1.CreateGraphics();
g.DrawRectangle(new Pen(Brushes.White , 20), 20, 20, 20, 20);
areaPath = new GraphicsPath();
areaPen = new Pen(Color.Red, 20);
areaPath.AddRectangle(20, 20, 20, 20);
areaPath.Widen(areaPen);
areaRegion = new Region(areaPath);
}
然后在鼠标的移动事件中
private void Form_MouseMove(object sender, MouseEventArgs e)
{
if (areaRegion.IsVisible(e) == true)
{
Graphics g = this.pictureBox1.CreateGraphics();
g.DrawRectangle(new Pen(Brushes.Red , 20), 20, 20, 20, 20);
}
}
只是给个思路,具体你自己看着办吧,本人菜鸟一个,不敢说太多了.

[lpcjj1122]

我来顶一下.如果有画了多个图形...怎么和要高亮的那个对应起来呢..

[lpcjj1122]

        System.Drawing.Drawing2D.GraphicsPath gp;
        Region region;
        Pen pen = new Pen(Color.Red, 20);
        Rectangle rc = new Rectangle(20, 20, 150, 200);
        Rectangle rc1 = new Rectangle(150, 200, 400, 400);

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
        }

        private void Form1_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            g.DrawRectangle(new Pen(Brushes.Blue, 20), rc);
            g.DrawRectangle(new Pen(Brushes.Blue, 20), rc1);
            gp = new System.Drawing.Drawing2D.GraphicsPath();
            gp.AddRectangle(rc);
            gp.AddRectangle(rc1);
            gp.Widen(pen);
            region = new Region(gp);
            g.Dispose();
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (region != null && region.IsVisible(e.Location) == true)
            {
                Graphics g = this.CreateGraphics();
                g.DrawRectangle(new Pen(Brushes.Red, 20), rc);
                g.Dispose();
                gp = null;
                region = null;
            }
        }

现在的情况是,移到两个矩形上都是亮的一个...我现在要移到了那个大的矩形上时...红色部分也亮着高亮的部分...讨论讨论...有什么好方法...大家研究一下啊..

[lpcjj1122]

我顶.

[ghl2312]

你要做了选种的处理，才能选中呀！
基本思路：判断当前鼠标是否在所画图形之上，如果是则用其他颜色重画！