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| SetCollisionGrid | ||
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Moderators: kornalius, bmanske, PointOfLight
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| Author | Post | ||
| Heinz |
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  Registered Member #114 Joined: Tue Oct 24 2006, 01:40pmPosts: 202 | I have a small side scroller demo (similar to scroll.ppl in the demo directory of ppl) and since my background images are 2000 pixels wide, I have to use the SetCollisionGrid to use sprite collisions. The problem is, that I don't really understand the parameters of this command. The first is probably the cell size, which should be kept at 32 pixels to maintain the detection resolution I assume. Are the other two parameters the width and height of the bitmap in multiples of this cell size?? If this is the case, the standard 4096 pixels (32*128) should be more then enough for my 2000 pixel bitmap, shouldn't it? The other problem is, that if the values are too big (to be on the safe side  the program crashes, when it is closed  Any hints on how to calculate the proper SetCollisionGrid paramters from the bitmap size (and Autoscrollspeed) would be highly appreciated. regards, Heinz | ||
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| zehlein |
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  Registered Member #30 Joined: Tue Sep 12 2006, 03:00pmPosts: 449 | Heinz, did you encounter any problems with the collision detection running with the default values? I never used SetCollisionGrid() myself but what I understand reading the helpfile those standard setting should be ok with you. There is a crack, a crack in everything. That's how the light gets in. (L. Cohen) | ||
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| Heinz |
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| Registered Member #114 Joined: Tue Oct 24 2006, 01:40pmPosts: 202 | Yes, at the Pixelposition 766 (OriginX: 1917) of the background image I get a error message with the comment: "Collision grid out of bounds, use function SetCollisionGrid() to fix." That's in fact how I learned about this function By trial and error I found now a parameter set that works on the PC, but since I don't understand the parameters, I am not sure whether it would work on other computers and PPCs as well (especially since I would expect the standard parameters to work for my example - if I understood the help properly they should cover bitmaps up to 4096 pixels, while I have only 2000 pixels in my background bitmap). regards, Heinz | ||
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| zehlein |
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| Registered Member #30 Joined: Tue Sep 12 2006, 03:00pmPosts: 449 | So this seems to be for Alain to answer... There is a crack, a crack in everything. That's how the light gets in. (L. Cohen) | ||
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| kornalius |
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   Registered Member #1 Joined: Wed Apr 19 2006, 08:25pmPosts: 2783 | The width and height values are the number of cells horizontally and vertically. The size in pixel of each cell is specified in the first parameter. Just increase the width and height and you should be covered. You can do the following math to make sure it will never be out of collision bounds: CellSize * Width = Max horizontal pixels allowed for collision detection. CellSize * Height = Max vertical pixels allowed for collision detection. Regards, Alain Deschenes President and programmer ArianeSoft Inc. (http://www.arianesoft.ca) | ||
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