Comments on: Managed DirectX C# Graphics Tutorial 2: Drawing a Triangle

By: Jens

Jens — Tue, 12 Jul 2011 13:33:13 +0000

Thank you for your Tutorial
I’m a german student, but i understand your tutorial very well, i was searching a long time for a good tutorial, but now i found one

But on your 1st tutorial i have to say that your code only run @Net. Framework 3.5, maybe you can add this @beginning so other beginners hasn’t this problem

By: gregd1024

gregd1024 — Mon, 17 Jan 2011 04:53:09 +0000

Thank you, Ram.

By: Ram Raddhakrishnan

Ram Raddhakrishnan — Sun, 16 Jan 2011 19:30:18 +0000

Thank you for a clearly written, handy tutorial.
It has just the right ingredients to satisfy my impatience – a bit of linear algebra as it relates to 3D transforms, just enough C++ and sufficient C#. I could not have asked for a more balance recipe!.

By: Jay

Jay — Fri, 15 Oct 2010 14:43:41 +0000

Read your Tutorial, getting this result: http://a00.img-up.net/?up=strangeo9j6d.jpg

MS Visual C# 2010
MS DirectX SDK June 2010

Wtf is this? No Warnings or Errors while compiling…

By: shome24

shome24 — Sun, 10 Oct 2010 16:35:53 +0000

Dear All,

I don’t have “vector4″ object in my system,
which dll can I download to get it?

Shmuel

By: Till

Till — Wed, 30 Sep 2009 06:14:40 +0000

Robert uses an older DirectX version !

By: gregd1024

gregd1024 — Sun, 25 Jan 2009 17:34:16 +0000

Robert – hmmmm, maybe DirectX changed this in your version, but mine works fine just by setting the Position property directly. Thanks for the additional code.

-Greg

By: Robert

Robert — Mon, 19 Jan 2009 15:43:16 +0000

There is an error here to do with the vertices. Each should be changed to:-

vertexes[0].SetPosition( new Vector4(50, 50, 0, 1.0f));
vertexes[0].Color = System.Drawing.Color.FromArgb(0, 255, 0).ToArgb();

While I am here, can I suggest to others working through this tutorial (which I think is excellent) that you can experiment with values, inputting values into the running application by doing the following.

1. Create a standard C# windows application.
a. in the window add a ‘Panel’ (in the example below it’s name is ‘panelDraw’)
b. Now you can add textboxes and values around this and a Button to redraw with new values (include an information box so that you can feed back infortion on values to yourself).
2. As stated in the first tutorial add refferences for DirectX and DirectX3d
3. Add ‘using’ statements at the top of your source.
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
4. Add the device to the class
private Device m_device = null;

Example
namespace graphclassws
{
public partial class Form1 : Form
{
private Device m_device = null;
public Form1()
{
InitializeComponent();
InitGraphics();
}

private void InitGraphics()
{
PresentParameters present_params = new PresentParameters();
present_params.Windowed = true;
present_params.SwapEffect = SwapEffect.Discard;
//panelDraw is our Panel control
m_device = new Device(0, DeviceType.Hardware, panelDraw, CreateFlags.SoftwareVertexProcessing, present_params);

}

…..rest of class ….

So using code up to the second in greg’s tutorial our trigger button may look like this.

private void btnFindPointOnLine_Click(object sender, EventArgs e)
{
//clear our device surface
m_device.Clear(ClearFlags.Target, System.Drawing.Color.FromArgb(0, 0, 255).ToArgb(), 1.0f, 0);
//create array of vertexes
CustomVertex.TransformedColored[] vertexes = new CustomVertex.TransformedColored[3];

//initialize vertexes
vertexes[0].SetPosition( new Vector4(50, 50, 0, 1.0f));
vertexes[0].Color = System.Drawing.Color.FromArgb(0, 255, 0).ToArgb();

vertexes[1].SetPosition( new Vector4(250, 50, 0, 1.0f));
vertexes[1].Color = System.Drawing.Color.FromArgb(0, 0, 255).ToArgb();

vertexes[2].SetPosition( new Vector4(50, 250, 0, 1.0f));
vertexes[2].Color = System.Drawing.Color.FromArgb(255, 0, 0).ToArgb();

//draw our surface
m_device.BeginScene();
m_device.VertexFormat = CustomVertex.TransformedColored.Format;
m_device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, vertexes);
m_device.EndScene();
m_device.Present();
}

This helps you to work along through these tutorials, and experiment with the running code.