Simple Random Terrain Generator

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HoboBen	Created : 14 May 2010 System : Windows Language : Cobra Simple Random Terrain Generator
Simple fractal random terrain generation. Less than 100 lines of code, including displaying to screen. Adjustable turbulence. { By Ben Golightly 2010, tophatstuff.co.uk Feel free to modify and use with or without credit } Program Uses cobra2d, keyset Const WORLD_XSIZE = 1024 WORLD_YSIZE = 768 Var tile: Array[WORLD_XSIZE, WORLD_YSIZE] of Real x, y, c, m: Integer = 0 roughness: Real = 2.0 canvas: Element Procedure DivideGrid(x1: Integer, y1: Integer, x2: Integer, y2: Integer) Var w, h : Integer midx, midy: Integer c, d: Real Begin w = x2-x1 h = y2-y1 midx = (x1+x2)/2 midy = (y1+y2)/2 d = ((ToReal(w+h)/2) / ToReal(WORLD_XSIZE + WORLD_YSIZE)) d = d * Rnd(-1,1) * roughness If (w > 1) or (h > 1) then tile[midx, y1] = (tile[x1, y1] + tile[x2, y1]) / 2 tile[midx, y2] = (tile[x1, y2] + tile[x2, y2]) / 2 tile[x1, midy] = (tile[x1, y1] + tile[x1, y2]) / 2 tile[x2, midy] = (tile[x2, y1] + tile[x2, y2]) / 2 tile[midx, midy] = d + ((tile[x1, y1] + tile[x1, y2] + tile[x2, y1] + tile[x2, y2]) / 4) If tile[midx, midy] > 1 then tile[midx, midy] = 1 If tile[midx, midy] < 0 then tile[midx, midy] = 0 DivideGrid(x1,y1,midx,midy) DivideGrid(midx,y1,x2,midy) DivideGrid(x1,midy,midx,y2) DivideGrid(midx,midy,x2,y2) Endif End Begin Randomize SetAppName("Random Terrain Generation Prototype") OpenScreen(1024, 768, 32, FALSE, COB_SHOWBORDER) canvas = CreateSprite(WORLD_XSIZE, WORLD_YSIZE) PositionSprite(canvas, (1024-WORLD_XSIZE)/2, (768-WORLD_YSIZE)/2) While (KeyHits(VK_ESCAPE) < 1) If ((Millisecs - m) > 1000) then tile[0, 0] = 0.5 tile[WORLD_XSIZE-1, 0] = 0.5 tile[0, WORLD_YSIZE-1] = 0.5 tile[WORLD_XSIZE-1, WORLD_YSIZE-1] = 0.5 DivideGrid(0,0,WORLD_XSIZE-1,WORLD_YSIZE-1) For x = 0 to WORLD_XSIZE-1 For y = 0 to WORLD_YSIZE-1 c = tile[x,y]*255.0 Pixel(x,y,ToRGBA(c,c,c),canvas) Next Next m = millisecs Endif If KeyDown(VK_UP) then roughness = roughness + 0.05 If KeyDown(VK_DOWN) then roughness = roughness - 0.05 SetAppName("Random Terrain Generation Prototype. Turbulance is "+roughness+", press up/down to adjust") Flip Pause(1) Wend End --v Exe and source code: download zip (1.4 MB) Screenshot:

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Simple Random Terrain Generator

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