关于图像的点击事件 [英] regarding click event of image

问题描述

c正在拍摄图片...

现在我想以这样一种方式进行管理，以便在单击图像后应该在单击部分上显示十字...

这有什么解决办法?

plz建议


Adbvance中的TnX

c am having an image ...

now i want to manage in such a way so that after clicking on image it should show cross on the click part...

is thr any solution for that???

plz advice


TnX in Adbvance

推荐答案

假定您使用的是图片框(您不一定要这样做，但它会使此示例更容易)，您需要处理两个事件:Picturebox.MouseClick和PictureBox.Paint.提供一个课程级别的Point，以便您知道中心在哪里以及:

Assuming you are using a picture box (you don''t have to and probably shouldn''t, but it makes this example easier) you need to handle two events: Picturebox.MouseClick, and PictureBox.Paint. Provide a class level Point so you know where the center is and:

private Point crossCentre;
private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
    {
    crossCentre = e.Location;
    pictureBox1.Invalidate();
    }
private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
    Graphics g = e.Graphics;
    if (crossCentre != null)
        {
        int x = crossCentre.X;
        int y = crossCentre.Y;
        g.DrawLine(Pens.AntiqueWhite, x, y - 10, x, y + 10);
        g.DrawLine(Pens.AntiqueWhite, x - 10, y, x + 10, y);
        }
    }

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