Mouse and Keyboard input in a Window Application?

Question

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.

J Elasigue · Answer

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 Loughridge · Answer

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); // lefttop //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); // lefttop //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); // lefttop //you are done with the objects you created so DISPOSE of them myBrush.Dispose(); myPen.Dispose(); } } }