在表单上创建坐标？ [英] Creating coordinates on the form?

问题描述

我正在创建一个有两条线的形状，就像两个坐标x轴和y轴一样

现在我想在这些坐标上添加点。



例如在这一点上（2,3）我想在点（-4,5）上添加点

另一点
$ b点上的$ b（-5，-7）另一点

点（4，-6）另一点



如何我可以这样做吗？



这里有两行

I am creating a form which have two lines on it just like the two coordinates x-axis and y-axis
Now i want to add points on these coordinates.

e.g on this point(2,3) i want to add a point
on the point (-4,5) another point
on the point (-5,-7) another point
on the point (4,-6) another point

How can i do this?

here are two lines

e.Graphics.DrawLine(Pens.Black, 190, 210, 350, 210)
    e.Graphics.DrawLine(Pens.Black, 330, 90, 330, 300)

推荐答案

使用简单的数学。您必须将原始的0,0点位置存储在表单上。假设你的表单有尺寸：300x200，你的轴正好在表格的中间，你可以这样做：

Use simple mathematics. You must store your original 0,0 point location on form. Assuming your form has dimensions: 300x200 and you have your axis exactly in the middle of the form you can do like this:

private int X0 = 150;
private int Y0 = 100;

// Pass your values to calculation method
private Point CalculatePoint(int x, int y)
{
    return new Point(X0 + x, Y0 + y);
}

然后在您的代码中，您可以这样调用此方法：

Then in your code you call this method like this:

var point1 = CalculatePoint(2, 3);    // 152, 103
var point2 = CalculatePoint(-4, 5);   // 146, 105
var point3 = CalculatePoint(-5, -7);  // 145, 93
var point4 = CalculatePoint(4, -6);   // 154, 94

您可以使用表单的OnClientSizeChanged来确定何时更改表单大小。然后只需更新原始点位置：

You can use form's OnClientSizeChanged to determine when form size changed. Then simply update your original point location:

private void Form1_ClientSizeChanged(object sender, EventArgs e)
{
    X0 = this.Size.Width / 2;
    Y0 = this.Size.Height / 2;
}

不要忘记重绘你的图表。



干杯！

And don't forget to redraw your chart.

Cheers!

最简单的方法是按照我的想法执行以下步骤



1）添加标签的控制数组（如果是数字）点数不固定。

2）添加两个文本框用于坐标输入，例如textX，textY

3）添加textchanged事件，输入以下代码

easiest way is following step as I think

1) Add control array of label if number of dots are not fixed.
2) Add two textbox for co-ordinates entry e.g. textX, textY
3) Add in there textchanged event, enter following code

textX.location = New System.Drawing.Point(Val(txtX.Text) , textX.location.Y)

textY.location = New System.Drawing.Point(textX.location.X,Val(txtY.Text))

试试这个并回复。

try this and reply.

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