/**
* Calculate UV of given position on a rendered texture given the border.
* Returned value is [(0,0)..(textureWidth,textureHeight)].
*/
public static Vector2 PixelToUV(Rect drawRect, Rect textureRect, Vector2 position, RectOffset border = null)
{
position -= drawRect.min;
drawRect.x = 0;
drawRect.y = 0;
if ((border == null) || border.IsZero())
{
if ((drawRect.width == 0f) || (drawRect.height == 0f))
{
return(Vector2.zero);
}
Vector2 result = new Vector2();
result.x = textureRect.x + (position.x / drawRect.width * textureRect.width);
result.y = textureRect.y + (position.y / drawRect.height * textureRect.height);
return(result);
}
Rect innerRect = border.Remove(drawRect);
Rect innerTexture = border.Remove(textureRect);
float x;
float y;
if (position.x <= innerRect.xMin)
{
x = position.x;
}
else if (position.x >= innerRect.xMax)
{
x = (textureRect.xMax - (drawRect.width - position.x));
}
else
{
if (innerRect.width == 0)
{
x = innerTexture.xMin;
}
else
{
x = ((position.x - innerRect.xMin) / innerRect.width) * innerTexture.width + innerTexture.xMin;
}
}
if (position.y <= innerRect.yMin)
{
y = position.y;
}
else if (position.y >= innerRect.yMax)
{
y = (textureRect.yMax - (drawRect.yMax - position.y));
}
else
{
if (innerRect.height == 0)
{
y = innerTexture.yMin;
}
else
{
y = ((position.y - innerRect.yMin) / innerRect.height) * innerTexture.height + innerTexture.yMin;
}
}
return(new Vector2(x, y));
}
