fractal
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fractal [2011/04/12 23:27] – cedric | fractal [2016/10/30 21:09] (current) – removed cedric | ||
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- | ====== Fractal landscape ====== | ||
- | Surface generated using a stochastic algorithm was my speciality when I studied fractals. | ||
- | A rapport and a presentation about landscape fractals (in french). | ||
- | {{: | ||
- | {{: | ||
- | |||
- | |||
- | ====== Iterated function system ====== | ||
- | |||
- | {{: | ||
- | |||
- | You can download the source code above: hg clone [[https:// | ||
- | <code ocaml> | ||
- | #load " | ||
- | |||
- | type point = { x: float; y: float} | ||
- | |||
- | type transfo = { pb: float; kf: float array} | ||
- | |||
- | type ifs = { po: point; sz: point; lt: transfo list} | ||
- | |||
- | let image kf p = | ||
- | { x= kf.(0)*.p.x+.kf.(1)*.p.y+.kf.(2); | ||
- | y= kf.(3)*.p.x+.kf.(4)*.p.y+.kf.(5)};; | ||
- | |||
- | let rec choix_image p rd = function | ||
- | | t::_ when rd<=t.pb -> image t.kf p | ||
- | | _::lt -> choix_image p rd lt | ||
- | | [] -> raise Not_found;; | ||
- | |||
- | open Graphics;; | ||
- | open_graph " 400x640";; | ||
- | |||
- | let pixel_of_point po sz p = | ||
- | (int_of_float((p.x-.po.x)/ | ||
- | int_of_float((p.y-.po.y)/ | ||
- | |||
- | let tracer fs n = | ||
- | let _ = clear_graph () in | ||
- | let rec urs pt = function | ||
- | | 0 -> () | ||
- | | i -> let p' = (choix_image pt (Random.float 1.0) fs.lt) in | ||
- | let (xx,yy) = pixel_of_point fs.po fs.sz p' in | ||
- | let _ = plot xx yy | ||
- | in urs p' (i-1) | ||
- | in urs {x= 1.0; y= 1.0} n;; | ||
- | |||
- | let bizarre = | ||
- | { po = {x= -2.25 ; y= -0.50}; | ||
- | sz = {x= 5.00 ; y= 11.00}; | ||
- | lt = [{pb= 0.84; kf= [| 0.85; 0.04; 0.00; -0.04; 0.85; 1.60|]}; | ||
- | {pb= 0.91; kf= [|-0.15; 0.28; 0.00; 0.26; 0.24; 0.44|]}; | ||
- | {pb= 0.98; kf= [| 0.20;-0.26; 0.00; 0.23; 0.22; 1.60|]}; | ||
- | {pb= 1.00; kf= [| 0.00; 0.00; 0.00; 0.00; 0.16; 0.00|]}]};; | ||
- | |||
- | let sierpinski = | ||
- | { po = {x= -5.0 ; y= -8.0}; | ||
- | sz = {x= 5.0 ; y= 3.0}; | ||
- | lt = [{pb= 0.333; kf= [|0.5; 0.0; 0.0; 0.5; 0.0; 0.0|]}; | ||
- | {pb= 0.666; kf= [|0.5; 0.0; 0.0; 0.5; 1.0; 0.0|]}; | ||
- | {pb= 1.00; kf= [|0.5; 0.0; 0.0; 0.5; 0.5; 0.8660254|]}]};; | ||
- | |||
- | let dragon = | ||
- | { po = {x= -40.0 ; y= -10.0}; | ||
- | sz = {x= 110.0 ; y= 110.0}; | ||
- | lt = [{pb= 0.787473; kf= [| 0.824074; 0.281482; -10.88229; -0.212346; | ||
- | 0.864198; -0.110607|]}; | ||
- | {pb= 1.0; kf= [| 0.288272; 0.720988; 0.78536; -0.463889; -0.377778; | ||
- | 80.095795|]}]};; | ||
- | |||
- | let corail = | ||
- | { po = {x= -45.0 ; y= -5.0}; | ||
- | sz = {x= 95.0 ; y= 100.0}; | ||
- | lt = [{pb= 0.40; kf= [| 0.307692; -0.531469; 50.401953; -0.461538; | ||
- | -0.293706; 80.655175|]}; | ||
- | {pb= 0.55; kf= [| 0.307692; -0.076923; -10.295248; 0.153846; | ||
- | -0.447552; 40.152990|]}; | ||
- | {pb= 1.00; kf= [| 0.000000; 0.545455; -40.893637; 0.692308; | ||
- | -0.195804; 70.269794|]}]};; | ||
- | |||
- | let arbre = | ||
- | { po = {x= -0.3 ; y= 0.0}; | ||
- | sz = {x= 0.6 ; y= 0.5}; | ||
- | lt = [{pb= 0.05; kf= [| 0.0; 0.0; 0.0; 0.0; 0.5; 0.0|]}; | ||
- | {pb= 0.45; kf= [| 0.42; -0.42; 0.0; 0.42; 0.42; 0.2|]}; | ||
- | {pb= 0.85; kf= [| 0.42; 0.42; 0.0; -0.42; 0.42; 0.2|]}; | ||
- | {pb= 1.00; kf= [| 0.1; 0.0; 0.0; 0.0; 0.1; 0.2|]}]};; | ||
- | |||
- | let etoile = | ||
- | { po = {x= -50.0 ; y= -20.0}; | ||
- | sz = {x= 100.0 ; y= 100.0}; | ||
- | lt = [{pb= 0.912675; kf= [| 0.745455; -0.459091; 10.460279; 0.406061; | ||
- | 0.887121; 0.691072|]}; | ||
- | {pb= 1.0; kf= [| -0.424242; -0.065152; 30.809567; -0.175758; | ||
- | -0.218182; 60.741476|]}]};; | ||
- | |||
- | let zigzag = | ||
- | { po = {x= -70.0 ; y= -20.0}; | ||
- | sz = {x= 150.0 ; y= 130.0}; | ||
- | lt = [{pb= 0.888128; kf= [| -0.632407; -0.614815; 30.840822; | ||
- | -0.54537; | ||
- | 0.659259; 10.282321|]}; | ||
- | {pb= 1.0; kf= [| -0.036111; 0.444444; 20.071081; 0.210185; 0.037037; | ||
- | 80.330552|]}]};; | ||
- | |||
- | let cristal = | ||
- | { po = {x= -0.0 ; y= -70.0}; | ||
- | sz = {x= 100.0 ; y= 140.0}; | ||
- | lt = [{pb= 0.747826; kf= [| 0.69697; -0.481061; 20.147003; -0.393939; | ||
- | -0.662879; 10.310288|]}; | ||
- | {pb= 1.0; kf= [| 0.090909; -0.443182; 40.286558; 0.515152; -0.094697; | ||
- | 20.925762|]}]};; | ||
- | |||
- | let binary = | ||
- | { po = {x= -50.0 ; y= -1.0}; | ||
- | sz = {x= 100.0 ; y= 95.0}; | ||
- | lt = [{pb= 0.333333; kf= [| 0.5; 0.0; -20.563477; 0.0; 0.5; | ||
- | -0.000003|]}; | ||
- | {pb= 0.666666; kf= [| 0.5; 0.0; 20.436544; 0.0; 0.5; -0.000003|]}; | ||
- | {pb= 1.0; kf= [| 0.0; -0.5; 40.873085; 0.5; 0.0; 70.563492|]}]};; | ||
- | |||
- | let galaxie = | ||
- | { po = {x= -8.0 ; y= -1.0}; | ||
- | sz = {x= 16.0 ; y= 12.0}; | ||
- | lt = [{pb= 0.787879; kf= [| 0.787879; -0.424242; 1.758647; 0.242424; | ||
- | 0.859848; 1.408065|]}; | ||
- | {pb= 0.909091; kf= [| -0.121212; 0.257576; -6.721654; 0.151515; | ||
- | 0.053030; 1.377236|]}; | ||
- | {pb= 1.0; kf= [| 0.181818; -0.136364; 6.086107; 0.090909; 0.181818; | ||
- | 1.568035|]}]};; | ||
- | |||
- | let koch = | ||
- | { po = {x= -2.25 ; y= -4.0}; | ||
- | sz = {x= 11.00 ; y= 8.00}; | ||
- | lt = [{pb= 0.25; kf= [|0.333; 0.0; 0.0; 0.333; 0.0; 0.0|]}; | ||
- | {pb= 0.50; kf= [|0.167; -0.287; 0.287; 0.167; 0.333; 0.0|]}; | ||
- | {pb= 0.75; kf= [|0.167; 0.287; -0.287; 0.167; 0.5; 0.287|]}; | ||
- | {pb= 1.0; kf= [|0.333; 0.0; 0.0; 0.333; 0.667; 0.0|]}]};; | ||
- | </ |