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Help!-How to draw anything in C# in Visual studio 2008?


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Please help me, how to draw anything in C#.

I wasted three days trying to do anything like that.

First I tried creating System.Drawing.Bitmap, but I don`t know how to display it on form, I only managed to create a drawing and saved it, but it wasn`t visible on screen.

Second I tried System.Drawing.Graphics, but I always get error:

"Object reference not set to an instance of an object"

I tried .CreateObjRef, but don`t know how to set type.

Third I tried creating .BMP resource, setting it as image for PictureBox, but when I try to modify it I always get error:

"SetPixel is not supported for images with indexed pixel formats."

Please, I beg you! Help me!!!

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The Asmageddon is coming.

You better prepare... or you won`t survive

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Please help me, how to draw anything in C#.

I wasted three days trying to do anything like that.

First I tried creating System.Drawing.Bitmap, but I don`t know how to display it on form, I only managed to create a drawing and saved it, but it wasn`t visible on screen.

Second I tried System.Drawing.Graphics, but I always get error:

"Object reference not set to an instance of an object"

I tried .CreateObjRef, but don`t know how to set type.

Third I tried creating .BMP resource, setting it as image for PictureBox, but when I try to modify it I always get error:

"SetPixel is not supported for images with indexed pixel formats."

Please, I beg you! Help me!!!

You don't need to "draw" anything really. Your trying to create a UI for a PDN plug-in, right? If so, either use the new "IndirectUI" system or the design tools in it.

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What do you want to draw, and where do you want to draw it?

Anything, anywhere, just draw something, like Line,dot,circle or rectangle.And anywhere on picture, on window, or anywhere, just draw something!

About UI, I know how to create it, I`m not a moron, I`m just very very frustrated.

EDIT:I want to create graphic program, where you can draw something like in Paint.NET

Logo-1.gif

The Asmageddon is coming.

You better prepare... or you won`t survive

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You should find a forum dedicated to C#...

BTWn this is a Codelab I've used for the early version of the spirograph, in which you'll find a good example (IMO) of the code to draw polygones with/for Paint.net:

int Amount1=5;  //[3,25]Quantity of angles
int Amount2=4;  //[2,99]Density
int Amount3=99;  //[2,99]Depth

void Render(Surface dst, Surface src, Rectangle rect)
{
 // Parameters
 int QtAng  = Amount1;
 int AmDens = Amount2;
 int AmDeep = 100 - Amount3;
 int AmZoom = 98;
 int MaxIter = 2000;  // Security limit for the while loop!

 PdnRegion selectionRegion = EnvironmentParameters.GetSelection(src.Bounds);
 Rectangle selection = this.EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();

 long MaxiX = (long)(selection.Right - selection.Left);
 long MaxiY = (long)(selection.Bottom - selection.Top);
 long CenterX = (long)(((selection.Right - selection.Left) / 2)+selection.Left);
 long CenterY = (long)(((selection.Bottom - selection.Top) / 2)+selection.Top);
 int Radius = (int)(AmZoom * Math.Min(MaxiX, MaxiY) / 200);
 ColorBgra PrimColor = (ColorBgra)EnvironmentParameters.PrimaryColor;
 ColorBgra BackColor = (ColorBgra)EnvironmentParameters.SecondaryColor;
 int BrushWidth = (int)EnvironmentParameters.BrushWidth;
 SolidBrush Brush1 = new SolidBrush(Color.FromArgb(PrimColor.A, PrimColor.R, PrimColor.G, PrimColor.);
 SolidBrush Brush2 = new SolidBrush(Color.FromArgb(BackColor.A, BackColor.R, BackColor.G, BackColor.);
 Pen Pen1 = new Pen(Brush1, BrushWidth);
 Pen Pen2 = new Pen(Brush2, BrushWidth);
 bool Alt = true;
 // Calculate the X,Y coords of the angles
 double[] sx = new double[1 + QtAng];
 double[] sy = new double[1 + QtAng];
 for (int i = 0; i < QtAng; i++)
 {
   sx[i] = CenterX + Radius * Math.Cos(i * 2 * Math.PI / QtAng);
   sy[i] = CenterY + Radius * Math.Sin(2 * Math.PI * i / QtAng);
 }
 // Last coords = first coords to close the polygon.
 sx[QtAng] = sx[0];
 sy[QtAng] = sy[0];

 // Copy existing image (source) to destination
 for (int y = rect.Top; y < rect.Bottom; ++y)
   for (int x = rect.Left; x < rect.Right; ++x)
     dst[x, y] = src[x, y];

 Graphics g = new RenderArgs(dst).Graphics; 
 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
 g.Clip = new Region(rect);
 int x1, y1, x2, y2;
 while ((MaxIter>0) && (d(sx[0], sy[0], CenterX, CenterY) > Radius * AmDeep / 100))
 {
   MaxIter--;
   x1 = (int)sx[0];
   y1 = (int)sy[0];
   Point[] Piece = new Point[1 + QtAng];
   for (int i = 0; i < 1 + QtAng; i++)
   {
     x2 = (int)sx[i];
     y2 = (int)sy[i];
     //g.DrawLine(Pen1, x1, y1, x2, y2);
     Piece[i] = new Point(x2,y2);
     x1 = x2;
     y1 = y2;
   }
   if (Alt) {g.FillPolygon(Brush1, Piece);} else {g.FillPolygon(Brush2, Piece);}
   Alt = !Alt;
   // boucle de dessin effectuer
   for (int i = 0; i < QtAng; i++)
   {
     sx[i] = sx[i] + (sx[1 + i] - sx[i]) / AmDens;
     sy[i] = sy[i] + (sy[1 + i] - sy[i]) / AmDens;
   }
   sx[QtAng] = sx[0];
   sy[QtAng] = sy[0];
 }
}
double d(double x1, double y1, double x2, double y2)
{
 return Math.Sqrt(Math.Pow(x1 - x2, 2.0) + Math.Pow(y1 - y2, 2.0));
}

Don't forget, help is your friend, it is true also for the C# code...

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I don`t want to create plugin for Paint.NET, I wan`t to create a simple graphic program myself!

I made a game using Built-in Components and writing function, I know how to create classes, I created a component, but I don`t know how to make it visible!And I didn`t found a way to acces code of ready components.

I made many plugins for Paint.NET, but I want to create something that will draw something on the form, or other component.

Logo-1.gif

The Asmageddon is coming.

You better prepare... or you won`t survive

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This is a forum for Paint.NET, not for C# or graphics coding in general. And you should know by now that having "HELP!" in your topic is frowned upon (to pit it mildly). It's kind of a pet peeve of mine.

Thread Closed

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