How to find the four coordinates and erase drawing of an rubberband rectangle in C#

Hi I have tried to draw an rubberband rectangle on a form using the mouse in C#.

Problems

1) After the mouse release the rectangle disappears. [I want it to stay on the form]

2) I also need to find the coordinates of the four points of the drawn rectangle

3) I also need to erase the rectangle to draw a new one when necessary

Form :

CODE

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;

namespace rubberbandrectangle
{
public partial class Form1 : Form
{
    Boolean bHaveMouse;
    Point ptOriginal = new Point();
    Point ptLast = new Point();


    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        bHaveMouse = true;
        ptOriginal.X = e.X;
        ptOriginal.Y = e.Y;
        ptLast.X = -1;
        ptLast.Y = -1;
    }

    private void MyDrawReversibleRectangle(Point p1, Point p2)
    {
        Rectangle rc = new Rectangle();

        p1 = PointToScreen(p1);
        p2 = PointToScreen(p2);
        if (p1.X < p2.X)
        {
            rc.X = p1.X;
            rc.Width = p2.X - p1.X;
        }
        else
        {
            rc.X = p2.X;
            rc.Width = p1.X - p2.X;
        }
        if (p1.Y < p2.Y)
        {
            rc.Y = p1.Y;
            rc.Height = p2.Y - p1.Y;
        }
        else
        {
            rc.Y = p2.Y;
            rc.Height = p1.Y - p2.Y;
        }
        ControlPaint.DrawReversibleFrame(rc,
                        Color.Red, FrameStyle.Dashed);
    }

    private void Form1_MouseUp(object sender, MouseEventArgs e)
    {
        bHaveMouse = false;
        if (ptLast.X != -1)
        {
            Point ptCurrent = new Point(e.X, e.Y);
            MyDrawReversibleRectangle(ptOriginal, ptLast);
        }
        ptLast.X = -1;
        ptLast.Y = -1;
        ptOriginal.X = -1;
        ptOriginal.Y = -1;
    }

    private void Form1_MouseMove(object sender, MouseEventArgs e)
    {
        Point ptCurrent = new Point(e.X, e.Y);
        if (bHaveMouse)
        {
            if (ptLast.X != -1)
            {
                MyDrawReversibleRectangle(ptOriginal, ptLast);
            }
            ptLast = ptCurrent;
                MyDrawReversibleRectangle(ptOriginal, ptCurrent);
        }
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        MouseDown += new MouseEventHandler(Form1_MouseDown);
        MouseUp += new MouseEventHandler(Form1_MouseUp);
        MouseMove += new MouseEventHandler(Form1_MouseMove);
        bHaveMouse = false;
    }





}
}

Than开发者_JAVA百科ks for reading

1) After the mouse release the rectangle disappears. [I want it to stay on the form]

You need to override the form's OnPaint method in order to continually draw your rectangle. Right now, you draw it when the mouse moves, but it needs to be drawn afterwards, as well.

2) I also need to find the coordinates of the four points of the drawn rectangle

These should be in your ptOriginal and ptLast variables - What more do you need?

3) I also need to erase the rectangle to draw a new one when necessary

Just stop drawing the rectangle, and draw the new one in the OnPaint.

I was looking for a similar thing but was amazed by the solution I found! You have the coordinates right? You can just use VisualBasic PowerPacks, it is included with my version of Visual Studio 2008

Here's a sample code that will draw a rectangle over a TextBox, i.e. I am giving it a custom border [code]

Dim x = TextBox1.Location.X
Dim y = TextBox1.Location.Y
Dim width = TextBox1.Width
Dim height = TextBox1.Height
Dim ShapeContainer1 As New Microsoft.VisualBasic.PowerPacks.ShapeContainer
Me.Controls.Add(ShapeContainer1)
Dim RectangleShape1 As New Microsoft.VisualBasic.PowerPacks.RectangleShape
ShapeContainer1.Shapes.AddRange(New Microsoft.VisualBasic.PowerPacks.Shape() {RectangleShape1})
RectangleShape1.Location = New System.Drawing.Point(x - 1, y - 1)
RectangleShape1.Size = New System.Drawing.Size(width + 1, height + 1)
RectangleShape1.BorderColor = Color.MistyRose
ShapeContainer1.Refresh()

Code is self describing but if you'd have any problem, just leave a message... Yes, if you want to remove the rectangle, just dispose the controls(either the Rectangle or the ShapeContainer in whole), no painting, no hassle!