2D rectangular clipping - oh the agony.

The_Minister · 2000-04-30T11:09:22

Once again, I need the assistance of this forum, and once again, I feel like an idiot. Intellectual capicity aside, I have been twisting my head around the concept of collision detection for the past two days, and I can''t seem to find what''s wrong in my algo'', so I''m asking some relatively fresh minds. Width = Width of this bitmap Height = Height of this bitmap Objects is an array of pointers to bitmaps. x is the amount to move on the x axis, and y is the amount to move along the y axis. This is in a loop in my Move function, which moves an object x in the x axis, and y in the y axis. index starts at zero and is inremented. I know the following will be hard to read due to lack of formatting, but please bear with me. // don''t waste time checking zero if(x) { if(x > 0) { // moving right if(Box.right + x >= Objects[index]->Box.left && Box.right + x < Objects[index]->Box.right && Box.top - y >= (Objects[index]->Box.top - Height) && (Box.bottom + y <= Objects[index]->Box.bottom + Height)) x = 0; } else // moving left if (Box.left - x <= Objects[index]->Box.right && Box.left - x > Objects[index]->Box.left && Box.top - y >= (Objects[index]->Box.top - Height) && (Box.bottom + y <= Objects[index]->Box.bottom + Height)) x = 0; } // end if if(y) { if(y > 0) { // moving down if (Box.bottom + y >= Objects[index]->Box.top && Box.bottom + y < Objects[index]->Box.bottom && Box.left - x >= (Objects[index]->Box.left - Width) && (Box.right + x <= Objects[index]->Box.right + Width)) y = 0; } else // moving up if (Box.top - y <= Objects[index]->Box.bottom && Box.top - y > Objects[index]->Box.top && Box.left - x >= (Objects[index]->Box.left - Width) && (Box.right + x <= Objects[index]->Box.right + Width)) y = 0; } // end if The problems are these: A: A bitmap will appear to get ''stuck'' inside another bitmap, and only be able to move out (the opposite direction on the axis he entered with). B: He will get stuck too far in the bitmap. My observations are these: A: The object appears to go too far into the bitmap before clipping. My reasonings are these: A: The object is getting stuck because it''s going too far in. B: I suspect it''s going too far in because of the code in the if statement that checks if it is within the correct boundaries in the other axis to register a collision. *** If this seems like gibberish, I apoligise for the wasted bandwith, and I''d better stop typing before me fingers cramp up into a ball and whack me repeatedly on the head. Thanks for your help. The_Minister

Graphics and GPU Programming Programming

Started by The_Minister April 27, 2000 04:46 PM

12 comments, last by The_Minister 23 years, 11 months ago

The_Minister

122

Author

April 29, 2000 10:02 AM

Hmm well there goes my physics engine

. Or lack thereof

.

Thank you Zip, I''ll get back to coding now... right after I figure out Dave''s joke.

The_Minister

[email=mwronen@mweb.co.za" onmouseOver="window.status='Mail The_Minister'; return true" onmouseOut="window.status=' '; return true]The_Minister[/email]1C3-D3M0N Interactive

Zipster

2,420

April 29, 2000 07:52 PM

Dave''s Joke:

Your nick is The_Minister. Keyword = "Minister"
Congregation, church, get it?

The_Minister

122

Author

April 30, 2000 04:14 AM

Aah I see, nice one Dave!

Although I prefer to use it backwards, as in the minister of Satan, or some other such paganistic crap that I couldn''t really care about...

Don''t think of me as your friend, think of me as your bridge between Earth and the fiery pits of Hell. Yeah that sounds good

.

The_Minister

[email=mwronen@mweb.co.za" onmouseOver="window.status='Mail The_Minister'; return true" onmouseOut="window.status=' '; return true]The_Minister[/email]1C3-D3M0N Interactive

Zipster

2,420

April 30, 2000 11:09 AM

So, you have connections to hell? Hehe, i might be talking to you again sometime...

2D rectangular clipping - oh the agony.

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2D rectangular clipping - oh the agony.

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