Is there an easy way to tell if two characters/symbols overlap?

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What I want is something more refined than just the character/symbol rect, I want to detect overlapping only when the black parts touch so that custom symbols could be drawn at any position and a close as possible, possibly even allowed to overlap.

Would using paths allow one to detect whether the characters/symbols overlap and is there some really simple code? Can't seem to find any in my searches. Thanks.

Posted 23-Feb-10 2:00am

Brian Bennett

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CPallini · Answer 1 · 2010-02-23T02:08:00

Solution 1

Well, if two bit patterns overlap, then the bitwise XOR (^) and OR (|) operations between them give different results.
It may be a starting point.

Posted 23-Feb-10 2:08am

CPallini

v2

Eugen Podsypalnikov · Answer 2 · 2010-02-23T02:19:00

Solution 2

if (CountOfBlackBits(hBmpComposed) <
    CountOfBlackBits(hBmpA) +
    CountOfBlackBits(hBmpB)) {
  // yes :)
...
}

Posted 23-Feb-10 2:19am

Eugen Podsypalnikov