Monkey-X - Random Terrain/Land Generator - Code example

Here a simple land/terrain generator. It works by drawing ovals on top of each other adding the tile value below. I think it creates useable maps. You can set the mapwidth and height and tilewidth and height values. 

I will be using this land generator method for my Civilization style game project experiments.

Code below :

Import mojo

Const mapwidth:Int=640/8
Const mapheight:Int=480/8
Const tilewidth:Int=8
Const tileheight:Int=8
Global map:Int[mapwidth][]
Global numland:Int = 0
Global percland:Float = 1.7
Class MyGame Extends App

    Method OnCreate()
        SetUpdateRate(1)
        Seed = Rnd(1000)
        'Set up the map array to be multi dimensional
        For Local i=0 Until mapwidth
            map[i] = New Int[mapheight]
        Next
        ' make the map the first time
        makemap
    End Method
    Method OnUpdate()
        ' how much land must it have numoflandtiles </mapsize/percland
        percland = Rnd(1.5,2.0)
           makemap
    End Method
    Method OnRender()
        Cls 0,0,0 
        drawmap        
        SetColor 255,255,255
        DrawText "Random Map Generator. Mapwidth: "+mapwidth+", Mapheight: "+mapheight,0,0
    End Method
End Class

Function drawmap:Void()
    For Local y=0 Until mapheight
    For Local x=0 Until mapwidth
        Local val:Int=map[x][y]
        ' tile 1,2,3,4 is sea
        If val<5 Then SetColor 0,0,val*10+100
        ' tile 5 6 7 8 is grasslands/trees
        If val>=5 And val <9 Then SetColor 0,val*15,0
        'tiles 9 10 11 12 13 is mountains
        If val>=9 Then SetColor val*15,val*4,0
        ' draw the tile
        DrawRect x*tilewidth,y*tileheight,tilewidth,tileheight
    Next
    Next
End Function

Function makemap:Void()
    numland=0
    ' exit loop if conditions on land percentage is good
       While numland<(mapwidth*mapheight/percland)
        ' erase the old data
        For Local y=0 Until mapheight
           For Local x=0 Until mapwidth
               map[x][y] = 0
        Next
        Next
        'lowest hold the highest tile value
        Local lowest = 0
        ' while land height is below 13
        While lowest < 13
            Local x1 = Rnd(mapwidth)
               Local y1 = Rnd(mapheight)
               ' create a radius for draw oval
            Local radius = Rnd(3,6)
            ' loop and create oval
            For Local y2=-radius To radius
            For Local x2=-radius To radius
                If ((x2*x2)+(y2*y2)) <= radius*radius+radius*0.8
                    Local x3 = x1+x2
                    Local y3 = y1+y2
                    If x3>=0 And y3>=0 And x3<mapwidth And y3<mapheight
                        ' add current position with added older tile value 
                        map[x3][y3]=map[x3][y3]+1
                        ' if current value is higher then lowest loop value
                        ' then store it in the loop exit variable
                        If map[x3][y3] > lowest Then lowest = map[x3][y3]
                    End If
                End If
            Next
            Next
        Wend
        'Count the number of land tiles
        numland=0
        For Local y=0 Until mapheight
        For Local x=0 Until mapwidth
            ' if the value is above 4 then add landtile counter
            If map[x][y] >= 5 Then numland+=1
        Next
        Next
    Wend
End Function

Function Main()
    New MyGame()
End Function