Rivers on a top down map.

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Pakz	Created : 30 May 2019 Language : Monkey2 Rivers on a top down map. Create 2d Rivers
' 2d top down map generator RIVER(S) #Import "<std>" #Import "<mojo>" Using std.. Using mojo.. Class MyWindow Extends Window ' Our map (tile)array Field map:Int[,] ' Our dimension variables Field mapwidth:Int,mapheight:Int ' tilewidth and height variables Field tw:Float,th:Float Method New() ' Randomize seed SeedRnd(Microsecs()) ' generate new map newmap() End method Method OnRender( canvas:Canvas ) Override App.RequestRender() ' Activate this method ' Space to generate new map If Keyboard.KeyReleased(Key.Space) Then newmap() 'Draw our map to the screen drawmap(canvas) ' if key escape then quit If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() ' draw some screen info canvas.Color = Color.Black canvas.DrawText("Press SPACE to generate new RIVER map.",0,0) End Method 'This method generates a new map Method newmap() ' Get a random map width/height' Local dimension:Int=Rnd(20,64) ' Create our map array map = New Int[dimension,dimension] ' Store our width and height in the variables mapwidth = dimension mapheight = dimension ' Store our tile width and height variables tw = Float(Width) / Float(mapwidth) th = Float(Height) / Float(mapheight) ' Create our new river generateriver() End Method ' This method generates a new river on the map Method generateriver() ' We start with a random point somewhere middish on the map. ' We create 2 sets of 2 variables for this Local x1:Float,y1:Float Local x2:Float,y2:Float x1 = Rnd(4,mapwidth-4) y1 = Rnd(4,mapheight-4) x2 = x1 y2 = y1 ' We want the river to go from this starting point into two different ' directions. We create 2 angle float variables for this. Local angle1:Float=Rnd(TwoPi) Local angle2:Float=Rnd(TwoPi) ' We have a river that has a variable width. Local riverwidth:Int=1 ' ' Here we start drawing a randomish line into the FIRST direction. Repeat ' Move this end of the river x1+=Cos(angle1) y1+=Sin(angle1) ' Slightly turn the direction of the river angle1+=Rnd(-.3,.3) ' If the river ends its turn on the end of the map ' then exit our loop(done) If x1<0 Or x1>=mapwidth Or y1<0 Or y1>=mapheight Then Exit ' Draw our river to the map.. ' Every loop cycle change the river width If Rnd()<.2 Then riverwidth = Rnd(1,3) For Local y:Int=y1-riverwidth To y1+riverwidth For Local x:Int=x1-riverwidth To x1+riverwidth If x>=0 And x<mapwidth And y>=0 And y<mapheight Then map[x,y] = 1 Next Next Forever ' Here we start drawing a randomish line into the SECOND direction. Repeat ' Move this end of the river x2+=Cos(angle2) y2+=Sin(angle2) ' Slightly turn the direction of the river angle2+=Rnd(-.3,.3) ' If the river ends its turn on the end of the map ' then exit our loop(done) If x2<0 Or x2>=mapwidth Or y2<0 Or y2>=mapheight Then Exit ' Draw our river to the map.. ' Every loop cycle change the river width If Rnd()<.2 Then riverwidth = Rnd(1,3) For Local y:Int=y2-riverwidth To y2+riverwidth For Local x:Int=x2-riverwidth To x2+riverwidth If x>=0 And x<mapwidth And y>=0 And y<mapheight Then map[x,y] = 1 Next Next Forever End Method ' This method draws the map to the screen. Method drawmap(canvas:Canvas) For Local y:Int=0 Until mapheight For Local x:Int=0 Until mapwidth Select map[x,y] Case 0 ' grass canvas.Color = Color.Green canvas.DrawRect(xtw,yth,tw+1,th+1) Case 1 ' river canvas.Color = Color.Blue canvas.DrawRect(xtw,yth,tw+1,th+1) End Select Next Next End Method End Class Function Main() New AppInstance New MyWindow App.Run() End Function --v
Latest Update What the code does is create a river on a map. It starts by creating a random point somewhere middish on the map and then carves into two directions until it reaches the edge of the map. The direction of the river wil slightly change. There is a "brush tip" that is used to draw the current position of the river. This is the width of the river. This also changes randomly. In the example press Space to Generate new River. Code is commented...

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Rivers on a top down map.

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