Collision detection
Monkey Forums/Monkey Programming/Collision detection
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| I'm currently working on some code that requires some collision detection - primarily where the mouse can click on an object and the code detects that the object is clicked on. I'm currently detecting this based on the x,y location of the mouse, but this isn't good where the object is rotated. Does anyone have a better suggestion for this? |
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| Have a look at this NoOdle code... |
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| At my age and still don't know how to do matrixes. :( If it helps, here is one with just a couple of trig functions. Not as good as Noodles but works for simple rotating unscaled images. [monkeycode] Function collidedpoint:Int(px:Float,py:Float,imagex:Float,imagey:Float,image:Image,angle:Float) Local x1:Float = -image.HandleX() Local y1:Float = -image.HandleY() Local x3:Float = image.Width() - image.HandleX() Local y3:Float = image.Height() - image.HandleY() px = px - imagex py = py - imagey Local tx:Float = px*Cos(-angle) - py*Sin(-angle) Local ty:Float = py*Cos(-angle) + px*Sin(-angle) If tx > x1 If ty >y1 If tx < x3 If ty < y3 Return True Endif Endif Endif Endif Return False End Function [/monkeycode] [edited for errors] |
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| At my age and still don't know how to do matrixes. :( http://blog.wolfire.com/2010/07/Linear-algebra-for-game-developers-part-3 |
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| LOL! thanks Sledge. I am almost there just need to look in the more advanced topics. |
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| PointInPolygon() might help, if your object is not a rectangle. There are a couple of variations on it in the code forum. |
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| [Maths Mode On] @Jesse : Frank Ayres Jr. Schaum's Theory & Problems of Matrices is IMHO definitively the best book i ever read on Matrices [Maths Mode Off] ;) |
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| Noooo don't talk about matrices! My head exploded fixing MonkeyMax.. |
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| Thanks golomp but I think that book is too much for me right now. I did a quick search for the book and found this: http://archive.org/details/SchaumsTheoryProblemsOfMatrices |
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| Matrices are useful to modelise an environment. Fe, you analyze a natural environment X. This environment X is represented in a sheet of number representing data, as much data as you can collect with a precise value.(place of data must be the same before and after peturbation) Then there is a perturbation on this environment.(earthquake, time, dynamic forces, magnetism, etc...)You obtain a new environment Y with new data inside.Any natural environment is ruled by a affine function Y=AX+B. If you are able to determinate A and B (fe with special 0 conditions)you can determinate the future of a same kind of environment changed by the same kind of perturbation. Fe in Asia, houses are build with this kind of analyse to determinate the level earthquake resistance. Matrices save lives! You can apply the same principe in a lot of domain (meteo, biology, mecanic, politic, mass effect, gaz, water, electricity, human society,...)Matrices are just a very usefull tool to manipulate a big collection of data. Giant Matrices exist with millions of values... |
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| Giant Matrices exist with millions of values... And this is then the so called Matrix, Neo ;) |
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