paths for enemies.
BlitzMax Forums/BlitzMax Beginners Area/paths for enemies.
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| I've been trying for some time to get a working type to handle spline movement. Basically I have been trying to have a spline type object that will take a two dimensional array of x and y values. It should have a function that would return the x and y value given a float "t" value ranging from 0 to 1. My problem is understanding how to compute the x and y values given "t". I think the spline I need is a cubic spline because the path must go through all control points. If anyone has a type for the job that takes a two dimensional array of x,y values and could return the x and y values for a given time I would be grateful. I'm not progressing as quickly as I should in math, I'm just a hobbyist programmer. I did manage to find a class for splines in the code section of the forum but it has many arrays that I don't know the function of. Basically I just need somthing that takes a 2d array of x and y values and spits out the x and y positions for a given time between 1 and 0. |
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| I think the term `cubic` means that there are usually four control points per spline, rather than that it necessarily goes through the control point. You're probably more likely talking about a b-spline or a catmull-rom spline. Look in the code archives, there is code for catmull rom splines and also cubic bezier splines. You can probably define how many `points` the curve has and therefore can calculate any given point along the curve in that many steps, which is what you need. |
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| I tried to use the crappy search feature to find some information about a spline class. I found some odd image related posts and some things about camera movement but nothing really about B Splines. I just can't seem to grasp the concept mathematically. Really I'm looking for something I can just plug in rather than having to reinvent the wheel. |
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| http://www.blitzbasic.com/codearcs/codearcs.php?code=1489 this is in BB, not in max, but you should be able to find what you need in there. |
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| This? and this? which has links to this and this . Perhaps this? I found these using the search function with keyword 'Spline'. |
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| Thanks tonyg. Got somthing up and running now. :) |
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