Monkey-X - Player vs Monsters on Empty map - code example

' I programmed this after playing the game Legend of Pandora.

Import mojo

Class enemy
    Field x:Float,y:Float
    Field ms:Float 'movement speed
    Field w:Int=32
    Field h:Int=32
    Field hp:Int
    Field hpceil:Int
    Field direction:String="up" ' left/right/up/down
    Field current:Bool=False 'if being updated
    Field deleteme:Bool=False
    Method New()
        ' find a spot to place the new enemy
        Local exitloop:Bool=False
        While exitloop=False
            exitloop = True
            Local nx = Rnd(50,640-50)
            Local ny = Rnd(50,480-50)            
            For Local i:=Eachin myenemy
                If distance(nx,ny,i.x,i.y) < 30 Or distance(myplayer.x,myplayer.y,nx,ny) < 250
                    exitloop = False
                End If
            Next
            If exitloop = True Then
                x = nx
                y = ny
            End If
        Wend
        ' Here we set the movement speed
        ms = Rnd(.1,.5)
        ' Here we set the hitpoints
        hp = Rnd(1,50)
        ' the ceiling is what he has or had at start (powerbar)
        hpceil = hp
    End Method
    Method update()
        current=True
        ' store the old location
        Local oldx:Float=x
        Local oldy:Float=y
        ' move the enemy towards the player
        If collide(x+1,y) = False And x < myplayer.x Then 
            x+=ms
            direction = "right"
        End If
        If collide(x-1,y) = False And x > myplayer.x Then 
            x-=ms
            direction = "left"
        End If
        If collide(x,y+1) = False And y < myplayer.y Then 
            y+=ms
            direction = "down"
        End If
        If collide(x,y-1) = False And y > myplayer.y Then 
            y-=ms
            direction = "up"
        End If
        untangle()
        current=False
    End Method
    Method untangle()
        For Local i:=Eachin myenemy
            If i.current=False
                If distance(i.x,i.y,x,y) < w
                    Local a:Int
                    a = getangle(i.x,i.y,x,y)
                    x += Cos(a)*1
                    y += Sin(a)*1
                End If
            End If
        Next
    End Method
    Method draw()
        SetColor 255,255,0
        DrawOval x-w/2,y-w/2,w,w
        'powerbar
        Local current:Float=(Float(w)/Float(hpceil))*hp
        
        SetColor 0,0,0
        DrawRect x-w/2,y+w/2,w,5
        SetColor 255,0,0
        DrawRect x-w/2,y+1+w/2,current,3
    End Method
    Method collide:Bool(xx:Int,yy:Int)
        For Local i:=Eachin myenemy
            If i.current = False
                If distance(xx,yy,i.x,i.y) < w Then Return True
            End If
        Next
        Return False
    End Method
    Function distance:Int(x1:Int,y1:Int,x2:Int,y2:Int)
        Return Abs(x2-x1)+Abs(y2-y1)
    End Function    
    Function getangle:Int(x1:Int,y1:Int,x2:Int,y2:Int)
        Local dx = x2 - x1
        Local dy = y2 - y1
        Return ATan2(dy,dx)+360 Mod 360
    End Function        
End Class


Class player
    Field x:Float,y:Float
    Field w:Int=32
    Field h:Int=32
    Field wx:Int,wy:Int
    Field direction:String="up" ' up/left/down/right
    Field weapondamage:Int=3
    Field swing:Bool=False
    Field swingcountdown:Int=0
    Method New(x:Int,y:Int)
        Self.x = x
        Self.y = y
        direction = "up"
    End Method
    Method update()
        updatecontrols()
        weaponenemies()
    End Method
    Method weaponenemies()
        If swing = False Then Return
        For Local i:=Eachin myenemy
            If distance(i.x,i.y,wx,wy) < 48
                Local a:Int=getangle(wx,wy ,i.x,i.y)
                i.x += Cos(a) * 32
                i.y += Sin(a) * 32
                i.hp -= weapondamage
                If i.hp<1 Then i.deleteme = True
            End If            
        Next
    End Method
    Method updatecontrols()
        ' store the location of the player
        Local oldx:Int=x
        Local oldy:Int=y
        'handle the movement
        If KeyDown(KEY_RIGHT) Then 
            x+=1
            direction = "right"
            swing=False
        End If
        If KeyDown(KEY_LEFT) Then 
            x-=1
            direction = "left"
            swing=False
        End If
        If KeyDown(KEY_UP) Then 
            y-=1
            direction = "up"
            swing=False
        End If
        If KeyDown(KEY_DOWN) Then 
            y+=1
            direction = "down"
            swing=False
        End If
        'Handle the weapon
        If swing = False
            If KeyDown(KEY_SPACE) Then 
                swing=True
                If direction = "left" Then wx=x-w ; wy=y
                If direction = "right" Then wx=x+w ; wy=y
                If direction = "up" Then wx=x ; wy=y-h
                If direction = "down" Then wx=x ; wy=y+h                
                swingcountdown = 20
            End If
        Else
            swingcountdown-=1
            If swingcountdown<0 Then swing=False
        End If
    End Method
    Method draw()
        SetColor 255,100,0
        DrawOval x-w/2,y-w/2,w,w
        If swing = True
            'where does the swing graphic get drawn
            DrawOval wx-w/2,wy-w/2,w,w
        End If
    End Method
    Function getangle:Int(x1:Int,y1:Int,x2:Int,y2:Int)
        Local dx = x2 - x1
        Local dy = y2 - y1
        Return ATan2(dy,dx)+360 Mod 360
    End Function        
    Function distance:Int(x1:Int,y1:Int,x2:Int,y2:Int)
        Return Abs(x2-x1)+Abs(y2-y1)
    End Function    

End Class


Global myplayer:player
Global myenemy:List<enemy> = New List<enemy>

Class MyGame Extends App

    Method OnCreate()
        SetUpdateRate(60)
        myplayer = New player(DeviceWidth()/2,DeviceHeight()/2)
        'For Local i:=0 Until 10
        '    myenemy.AddLast(New enemy())
        'Next
    End Method
    Method OnUpdate()           
        myplayer.update() 
        ' update the enemies
        For Local i:=Eachin myenemy
            i.update()
        Next
        ' if enemy hitpoint below 1 then remove him from list
        For Local i:=Eachin myenemy
            If i.deleteme = True Then myenemy.Remove(i)
        Next

        If myenemy.IsEmpty
            Local ecnt:Int=Rnd(2,10)
            For Local i:=0 Until ecnt
                myenemy.AddLast(New enemy())
            Next
        End If

    End Method
    Method OnRender()
        Cls 0,0,0
                
        For Local i:=Eachin myenemy
            i.draw()
        Next
        myplayer.draw()


        SetColor 255,255,255
        DrawText "Player vs Monsters on empty map",0,0
        DrawText "Space = Weapon , Cursor l/r/u/d = movement",0,20        
    End Method
End Class


Function Main()
    New MyGame()
End Function