调整PictureBox大小时如何制作矩形 [英] How to make a rectangle move when PictureBox is resized

问题描述

我有一个PictureBox，其图片作为应用程序的背景，并设置了所有Anchors，因此可以使用该窗体调整大小。在这个PictureBox上，我创建了许多其他的东西，现在只有矩形。我在一些X和Y坐标上创建它们，这很好。添加图片以显示我正在尝试做的事情。创建的矩形实际上是小淡蓝色方块。

I have a PictureBox with a picture as a background of an application, having all the Anchors set, so it can resize with the form. On this PictureBox, I am creating many other things, for now only rectangles. I am creating them on some X and Y coordinates, that is fine. Adding a picture to show what I am trying to do. Created rectangle is actually the little light blue square.

但是，当我调整窗体的大小时，例如我最大化它，矩形停留在相同的坐标处，当然这在当时其他地方（包括仅用于保存空间的图像的一部分）：我的问题是 - 如何在调整大小的过程中将矩形贴到相同的位置？注意 - 他们将不得不稍后移动，就像每隔2秒左右一样，所以它不能是绝对静态的。

But, when i resize the form, for example I maximize it, the rectangle stays at the same coordinates, which of course ar somewhere else at the moment (including only part of image to save space): My question is - how can i make the rectangle "stick" with the same place as it is, during the resize? Note - they will have to move later, like every 2 seconds or so, so it cant be absolutely static.

编辑：
这里是一些代码创建矩形

here is some of the code creating the rectangle

        private void button1_Click(object sender, EventArgs e)
    {
        spawn = "aircraft";
        pictureBox1.Invalidate();
    }
private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
        switch (spawn)
        {
            case "aircraft":
                 Point[] points = new Point[2];
                 Point bod = new Point(750, 280);
                 points[0] = bod;    
                 aircraft letadlo = new aircraft(605, 180, "KLM886", 180, e.Graphics);
                 aircrafts[0] = letadlo;
                 letadlo.points = points;
                 break;
                 ...

        public aircraft(int x, int y, string csign, int spd, Graphics g)
    {
        Pen p = new Pen(Color.Turquoise, 2);
        Rectangle r = new Rectangle(x, y, 5, 5);
        g.DrawRectangle(p, r);
        p.Dispose();

推荐答案

一个选项可以是在新坐标中重绘矩形这与PictureBox更改的大小成正比。
例如：

One option could be to redraw the rectangle in new coordinates which are proportional to the PictureBox changed size. For example:

oldX, oldY // old coordinates of the rectangle should be saved
oldPictureBoxWidth, oldPictureBoxHeight // should be saved too

//and on the PictureBox Paint event You have the new:
newPictureBoxWidth and newPictureBoxHeight

//the new coordinates of rectangle: (resize ratio is in brackets)
newX = oldX * (newPictureBoxWidth / oldPictureBoxWidth)
newY = oldY * (newPictureBoxHeight / oldPictureBoxHeight)

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