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Offline stevon8ter

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Xlib collision detection help
« on: May 30, 2012, 04:05:51 pm »
Ok, what are the best ways to do collision detection in xlib? Could you also give a little example?
Collision detection only, codes for showing sprites aren't a must
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Offline blue_bear_94

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Re: Xlib collision detection help
« Reply #1 on: May 30, 2012, 04:07:32 pm »
Since tilemaps are drawn using matrices, use a string, convert it to a matrix when drawing the tilemap, delete the matrix, and then use the string for collision detection.
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Offline stevon8ter

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Re: Xlib collision detection help
« Reply #2 on: May 30, 2012, 04:08:40 pm »
And how would i do that? :/ sorry, i'm
N00b
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Offline blue_bear_94

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Re: Xlib collision detection help
« Reply #3 on: May 30, 2012, 04:15:54 pm »
Use two nested For loops. Read one character from the string, using sub(), for each iteration, and write the corresponding value to the matrix (to convert a character to a value, you can use inString). Then use real(1,...) and then DelVar to delete the matrix. After that, store "sub(Str1,θ,1)" to r1.
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Offline shmibs

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Re: Xlib collision detection help
« Reply #4 on: May 31, 2012, 11:05:27 pm »
writing and deleting the matrix every time something is drawn would be rather slow. you should just copy it over once at the beginning of your program and delete it at the end.
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Offline jsj795

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Re: Xlib collision detection help
« Reply #5 on: May 31, 2012, 11:11:13 pm »
Collision detection with matrix is the easiest and fastest way to do so.
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Dumb boss + smart employee = promotion
Dumb boss + dumb employee = overtime
3. SHOPPING MATH
A man will pay $2 for a $1 item he needs.
A woman will pay $1 for a $2 item that she doesn't need.
4. GENERAL EQUATIONS & STATISTICS
A woman worries about the future until she gets a husband.
A man never worries about the future until he gets a wife.
A successful man is one who makes more money than his wife can spend.
A successful woman is one who can find such a man.
5. HAPPINESS
To be happy with a man, you must understand him a lot and love him a little.
To be happy with a woman, you must love her a lot and not try to understand her at all.
6. LONGEVITY
Married men live longer than single men do, but married men are a lot more willing to die.
7. PROPENSITY TO CHANGE
A woman marries a man expecting he will change, but he doesn't.
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A woman has the last word in any argument.
Anything a man says after that is the beginning of a new argument.

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Time = Money (Time is money)
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Girls = sqrt(Evil) squared (So, girls are the root of all evil squared)
Girls = Evil (Thus, girls are evil)
*Girls=Evil credit goes to Compynerd255*

Offline stevon8ter

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Re: Xlib collision detection help
« Reply #6 on: June 01, 2012, 09:15:26 am »
Actually it's not, if x-position = 48, then the coresponding matrix x-location = 7
And if you do 48/8 then you have 6. And if you then do 6+1 then the most left and most right tile give errors...
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Offline jsj795

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Re: Xlib collision detection help
« Reply #7 on: June 01, 2012, 01:29:21 pm »
what you want to do is ipart(X/8)+1. I don't see how this will result in error tho, unless you're trying to move off screen.

In order to not get an error, you would have to do a conditional checking

Example of this:
Code: [Select]
If press left
Then
If X=0
Then
Change screen to left map
Else
If walkable=[A](ipart(Y/8)+1,ipart((X-1)/8)+1
X-1->X
End
End
If press right
Then
If X=86
Then
Change screen to right map
Else
If walkable=[A](ipart(Y/8)+1,ipart((X+8)/8)+1
X+1->X
End
End
« Last Edit: June 01, 2012, 01:38:23 pm by jsj795 »
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Spoiler For funny life mathematics:
1. ROMANCE MATHEMATICS
Smart man + smart woman = romance
Smart man + dumb woman = affair
Dumb man + smart woman = marriage
Dumb man + dumb woman = pregnancy
2. OFFICE ARITHMETIC
Smart boss + smart employee = profit
Smart boss + dumb employee = production
Dumb boss + smart employee = promotion
Dumb boss + dumb employee = overtime
3. SHOPPING MATH
A man will pay $2 for a $1 item he needs.
A woman will pay $1 for a $2 item that she doesn't need.
4. GENERAL EQUATIONS & STATISTICS
A woman worries about the future until she gets a husband.
A man never worries about the future until he gets a wife.
A successful man is one who makes more money than his wife can spend.
A successful woman is one who can find such a man.
5. HAPPINESS
To be happy with a man, you must understand him a lot and love him a little.
To be happy with a woman, you must love her a lot and not try to understand her at all.
6. LONGEVITY
Married men live longer than single men do, but married men are a lot more willing to die.
7. PROPENSITY TO CHANGE
A woman marries a man expecting he will change, but he doesn't.
A man marries a woman expecting that she won't change, and she does.
8. DISCUSSION TECHNIQUE
A woman has the last word in any argument.
Anything a man says after that is the beginning of a new argument.

Girls = Time * Money (Girls are a combination of time and money)
Time = Money (Time is money)
Girls = Money squared (So, girls are money squared)
Money = sqrt(Evil) (Money is also the root of all evil)
Girls = sqrt(Evil) squared (So, girls are the root of all evil squared)
Girls = Evil (Thus, girls are evil)
*Girls=Evil credit goes to Compynerd255*

Offline stevon8ter

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Re: Xlib collision detection help
« Reply #8 on: June 01, 2012, 04:29:36 pm »
Thx, first i didn't thought your code was working, but then i realised my sprite-drawing part was somewhere else, thx, it works great
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