Mouse and Keyboard input in a Window Application?

J Elasigue

Hi, I'm trying to figure out how to get, and manipulate mouse clicks and keystrokes within a Windows Applet in order to paint something on a canvas. This is what I have so far:

using System;

using System.Windows.Forms;

using System.Drawing;

namespace WindowsApplication1

{

public class Program : Form1

{

public Program()

{

this.Paint += new PaintEventHandler (f1_Paint);

}

private void f1_Paint(object sender, PaintEventArgs e)

{

Graphics g = e.Graphics;

SolidBrush Back = new SolidBrush(Color.LightYellow);

g.FillRectangle(Back, 0, 0, 350, 550);

}

static void Main()

{

Application.Run(new Program());

}

This creates a default background of light yellow with the defined borders. What I'm trying to find is:

1) How to set the form size to a defined state bigger than the background, because at the moment I'm clicking and dragging things around to make it the size I'd like it to be.

2) How to read a mouseclick and mouseheld event so that (for now) it draws a black brush type based on the x and y coordinates that I obtain from the click.

I also intend to use this base background as a sort of set border, where I'll have a predrawn object circle, where if arrow keys are pressed, it will move the circle around.

I'm also using C# Express 2005 Edition, and have very little experience programming. Thank you in advance for any help.

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

J Elasigue18y ago
I can understand most of this code, but I just don't know what to do with it. X_x. I open the new windows application, and create the button (modifying what I need to in the properties panel). Where do I end up copy pasting all this code?
Paul Loughridge18y ago

Try this. Put a button on your form name btnExit text Exit

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace GDIPlus

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

//Form size

this.ClientSize = new System.Drawing.Size(800, 800);

// width ^^^ ^^^ height

//Form location and settings

this.Top = 20;

this.Left = 20;

this.Height = 600;

this.Width = 550;

this.MaximizeBox = false;

this.MinimizeBox = false;

this.BackColor = System.Drawing.Color.Aquamarine;

//Size buttons 80 x30

btnExit.Height = 30;

btnExit.Width = 80;

//Locate buttons

btnExit.Left = this.Width - 100;

btnExit.Top = this.Height - 74;

}

private void btnExit_Click(object sender, EventArgs e)

{

Close();

}

//This runs as soon as you start.

private void Form1_Paint(object sender, PaintEventArgs e)

{

//Define variables top, bottom, left, width, height, right and linelength

int itop = 20;

int ibottom = 520;

int ileft = 20;

int iwidth = 500;

int iheight = iwidth; //width and height are the same

int iright = ileft + iwidth;

int ilinelength = iwidth + 20;

Graphics g = e.Graphics;

//create pens. 4 and 8 are the width of the pen

Pen myPen = new Pen(Color.Black, 4);

Pen myPen2 = new Pen(Color.Black, 8);

//Rectangle

g.FillRectangle(Brushes.BurlyWood, ileft, itop, iwidth, iheight);

//Lines are all the same length since they are the borders of a square

//Line on left

g.DrawLine(myPen, ileft, itop, ileft, ilinelength);

//Line on right

g.DrawLine(myPen, iright, itop, iright, ilinelength);

//Line on top

g.DrawLine(myPen, ileft, itop, ilinelength, itop);

//Line on bottom

g.DrawLine(myPen, ileft, ibottom, ilinelength, ibottom);

//Other shapes. Use a different color brush for the Fill

//Ellipse

//Draw a wide black border around the ellipse

g.DrawEllipse(myPen2, 120, 70, 300, 150);

g.DrawEllipse(Pens.Black, 120, 70, 300, 150);

g.FillEllipse(Brushes.Chartreuse, 120, 70, 300, 150);

//left, top, width, height

//create a new solid brush. Dispose of when you it has been used.

SolidBrush myBrush = new SolidBrush(Color.OrangeRed);

Font fnt = new Font("Verdana", 16); //font, size

Font fnt1 = new Font("TimesNewRoman", 24); //font, size

//Draw text inside the Ellipse defining a SolidBrush

g.DrawString("GDI+ World", fnt, new SolidBrush(Color.Red), 200, 120);

// left,top

//Rectangle

//Draw a wide black border around the Rectangle

g.DrawRectangle(myPen2, 70, 300, 140, 140);

g.DrawRectangle(Pens.Red, 70, 300, 140, 140);

g.FillRectangle(Brushes.Khaki, 70, 300, 140, 140);

// left, top, width, height

//Draw text inside Rectangle using fnt youdefined. Notice the effect of spaces in the string.

g.DrawString("Orange" + (char)13 + (char)10 + " Red Text", fnt, myBrush, 80, 320);

// left,top

//Circle

//Draw a wide black border around the Circle

g.DrawEllipse(myPen2, 315, 300, 140, 140);

g.DrawEllipse(Pens.Black, 315, 300, 140, 140);

g.FillEllipse(Brushes.Aqua, 315, 300, 140, 140);

//left, top, width, height

//Draw text inside the Circle. Notice the effect of spaces in the string.

g.DrawString(" This is a" + (char)13 + (char)10 + " Circle", fnt, new SolidBrush(Color.Navy), 330, 340);

// left,top

//you are done with the objects you created so DISPOSE of them

myBrush.Dispose();

myPen.Dispose();

}

}

}