Draw a pixel and change its color in code

Questions & Answers
1

I’m trying to draw a single GUI pixel, and be able to change its color. I tried this but I cannot figure out how to change the color. brush is a public Texture.

GUI.DrawTexture(new Rect(100,100,1,1),brush,ScaleMode.StretchToFill,false,0);

I tried changing brush to a Texture2D, then using brush.SetPixel(0,0,Color.red); but the compiler says 'texture is not readable, the texture memory cannot be accessed from scripts.

There’s probably a really simple way to draw a single pixel and set the color. Let me know what that is please.

2

You could create your own texture and change it’s values, or you could set the texture to readable.

To do the former, just make a new texture:

private Texture2D brush;
private int size = 256;
	
void Awake()
{
	brush = new Texture2D(size, size);
	ChangeTheColor(Color.red);
}
	
void ChangeTheColor(Color c)
{
	for (int x = 0; x < size / 2; x++)
    	for (int y = 0; y < size / 2; y++)
			brush.SetPixel(x, y, c);
	brush.Apply();
}
	
void OnGUI()
{
	GUILayout.Label(brush);
}

For the latter, browse to your texture import settings, set ‘Texture Type’ to ‘Advanced’, and check ‘Read/Write Enabled’.