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| Explain the arguments.... |
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Dizzy Egg
Member #10,824
March 2009
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(Attached image to visualise request!) {"name":"607908","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/b\/2\/b2bf88bf226b95847801c57d19e36996.jpg","w":449,"h":552,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/b\/2\/b2bf88bf226b95847801c57d19e36996"} Hello guys, as part of something I'm working on I need to draw an object that can be thought of as a black pole that tapers from a fat bottom to a point at the far end; The base will be fixed but the pointed end will come under the stress of various forces and will move. I don't need help with the math for calculating the points, (starting at bottom left and moving up, then down to bottom right), but I'm struggling to understand the al_calculate_spline function in the html docs.... If someone could explain, given the 8 coordinates, how to determine stride, and also if my 'bottom left', to 'top', to 'bottom right' method is correct, I would be very grateful (I'm sure 'stride' relates to something completely different to what I am thinking!!)
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beoran
Member #12,636
March 2011
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There are some examples here: https://www.allegro.cc/forums/thread/610638 Basicaly, stride will be calculated with sizeof. If you have, say, a struct MyPoint { float x, y }; then you'll need to use sizeof(struct Mypoint); if you want the function to store the result into an array allocated with calloc or new of those structs. |
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