All I want for Xmas is a .....antialiased triangle!!

Windows
1

Sorry to sound needy, but I have been trying really hard to get one! I have been happily using monogame in my 2D hex map hobby - spritebatch goes a long way! - but now I would like to programitacally generate antialiased curves and so forth - in a windowed form. I have tried monogameforms
enableantialias, but I can’t seem to hit the mark. Is there a shortish program examplar that draws an antialised triangle that I could build from?

2

I didn’t add triangles yet, but you could use this code as a base: https://github.com/Apostolique/Apos.Shapes

I use the math from: Inigo Quilez :: fractals, computer graphics, mathematics, shaders, demoscene and more

Alternatively did you try rendering a triangle mesh? Drawing Triangles - RB Whitaker's Wiki

3

Thanks I will check them both out and get back.

4

I have finally cracked it! The following code draws antialiased lines and triangles. PrimitiveBatch can also be modified to accept textured primitives. I like the idea of PrimitiveBatch being so used to SpriteBatch. It sets up the orthographic projection etc so you’re all ready to go withouot delving into 3D stuff directly.
I spent an awful long time not getting things to work, but it turns out nicely simple - I hope my example will help others starting off. (P.S. dont’t forget to put your triangles in clockwise order … derrrrr!!)

The code below is not all in a codebox - how does it work please and I will edit…

{
using MonoGame.Forms.Controls;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
//my library that includes DoogeJ/MonoGame.Primitives2D
//and CartBlanche/MonoGame-Samples/primitives/PrimitiveBatch.cs
using GrafLib; 

namespace monogamecontroltest
{
	//inherits off Monogame.Forms.Controls.InvalidationControl,
	//which is a windowed monogame screen that gets drawn only when invalidated
	class MGcontrol : InvalidationControl  
	{
		SpriteBatch sb;
		PrimitiveBatch pb;
		protected override void Initialize()
		{
			base.Initialize();
			SetMultiSampleCount(8); //setting of only 2 gave cruder antialiasing
			sb = new SpriteBatch(GraphicsDevice);
			pb = new PrimitiveBatch(GraphicsDevice);
		}

		protected override void Draw()
		{
			base.Draw();
			GraphicsDevice.Clear(Color.White);

			//make use of the MonoGame.Forms.Services "Editor"
			Editor.BeginAntialising();
			sb.Begin();
			sb.DrawLine(20, 20, 40, 100, Color.Black, 10);
			sb.End();

			pb.Begin(PrimitiveType.TriangleList);
			pb.AddVertex(new Vector2(100, 100), Color.Red);
			pb.AddVertex(new Vector2(200, 100), Color.Red);
			pb.AddVertex(new Vector2(170, 195), Color.Red);
			pb.End();

			Editor.EndAntialising();
		}
	}
}
5

You can use 3 backticks:

```csharp
Console.WriteLine("Hello World!");
```
6

I see, thanks!

I can now also add some information about the wrapping mode of textures used by device.DrawUserPrimitives in the PrimitiveBatch Flush method- just put it immediately before each call … " I have the power!!" :man_dancing:

        device.SamplerStates[0] = SamplerState.PointWrap;
        device.DrawUserPrimitives<VertexPositionColorTexture>(primitiveType, vertices, 0,
            primitiveCount);

using MonoGame.Forms.Controls;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
//my library that includes DoogeJ/MonoGame.Primitives2D
//and CartBlanche/MonoGame-Samples/primitives/PrimitiveBatch.cs
using GrafLib;

namespace monogamecontroltest
{
//inherits off Monogame.Forms.Controls.InvalidationControl,
//which is a windowed monogame screen that gets drawn only when invalidated
class MGcontrol : InvalidationControl
{
SpriteBatch sb;
PrimitiveBatch pb;
    protected override void Initialize()
    {
    base.Initialize();
    SetMultiSampleCount(8); //setting of only 2 gave cruder antialiasing
    sb = new SpriteBatch(GraphicsDevice);
    pb = new PrimitiveBatch(GraphicsDevice);
    }

	protected override void Draw()
	{
		base.Draw();
		GraphicsDevice.Clear(Color.White);

		//make use of the MonoGame.Forms.Services "Editor"
		Editor.BeginAntialising();
		sb.Begin();
		sb.DrawLine(20, 20, 40, 100, Color.Black, 10);
		sb.End();

		pb.Begin(PrimitiveType.TriangleList);
		pb.AddVertex(new Vector2(100, 100), Color.Red);
		pb.AddVertex(new Vector2(200, 100), Color.Red);
		pb.AddVertex(new Vector2(170, 195), Color.Red);
		pb.End();

		Editor.EndAntialising();
	}
}