C#•3y ago

Check if a UiElement touch another UiElement [Answered]

27 Replies

(I can safely say you're not speaking Québec-French) But for your question: You have the position and size of the items?

Unknown UserOP•3y ago

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Yawnder•3y ago

Are they all considered circles, square, or something else?

Unknown UserOP•3y ago

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Yawnder•3y ago

Then you check if any corner of an item is within the boundaries of another. Not the same. Contained within.

Unknown UserOP•3y ago

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Yawnder•3y ago

It's not quite that many though.

Unknown UserOP•3y ago

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Yawnder•3y ago

for (int i = 0; i < [Whatever]; i++)
{
  for (int j = i + 1; j < [Whatever]; j++)
  {
  }
}

for (int i = 0; i < [Whatever]; i++)
{
  for (int j = i + 1; j < [Whatever]; j++)
  {
  }
}

See how the inner for starts at i + 1, not 0.

Unknown UserOP•3y ago

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Yawnder•3y ago

Say it in French and I'll tell you the word you're looking for 😉

Unknown UserOP•3y ago

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Yawnder•3y ago

"I'll keep you posted."

Unknown UserOP•3y ago

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Yawnder•3y ago

I wouldn't do that. If you do, you can't start the inner loop at the current index of the outer one. And it's not only "is not". Go for a simpler example. Let's say you have 3 coins (a, b, c). How would you check if any coins touch.

Unknown UserOP•3y ago

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Yawnder•3y ago

You check if A touches B, if A touches C, if B touches C. You never check if B touches A or C touches A since you already did the other way around.

Unknown UserOP•3y ago

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Yawnder•3y ago

And to see if they overlap, since they're all the same size, you check if a corner is inscribed within a rectangle.

Unknown UserOP•3y ago

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Yawnder•3y ago

Meaning: corner.X >= shape2.Left && corner.X <= shape2.Right && corner.Y >= shape2.Top && corner.Y <= shape2.Bottom Sure (if you don't understand something I say, I can translate. I just have to keep it generally in English to allow for anyone to step in and help.)

Unknown UserOP•3y ago

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Yawnder•3y ago

Not quite. I think you should break it down first. Extract the values you'll need, it will make it easier to debug:

// Between the two for:
var corner1X = ...
var corner1Y = ...
var corner2X = ...
var corner2Y = ...
var corner3X = ...
var corner3Y = ...
var corner4X = ...
var corner4Y = ...

// In the two for:
var leftBound = ...
var rightBound = ...
var topBound = ...
var bottomBound = ...

// Between the two for:
var corner1X = ...
var corner1Y = ...
var corner2X = ...
var corner2Y = ...
var corner3X = ...
var corner3Y = ...
var corner4X = ...
var corner4Y = ...

// In the two for:
var leftBound = ...
var rightBound = ...
var topBound = ...
var bottomBound = ...

And then do your checks. So for example, corner1X will probably be Canvas.GetLeft(Canvas_Board.Children[i]) while corner2X will probably be Canvas.GetLeft(Canvas_Board.Children[i]) + ElementSize

Unknown UserOP•3y ago

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Yawnder•3y ago

I went with 1 = top left, then clockwise. Or you can do 1 2 3 4 It's not important, as long as you know!

Unknown UserOP•3y ago

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Accord•3y ago

✅ This post has been marked as answered!

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Check if a UiElement touch another UiElement [Answered]

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