What basic engine would people like to see developed?

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Xaby

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Joined: 17th Apr 2007

Location: Berlin

Posted: 12th Dec 2019 21:00

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I wonder, why there is no GetSpriteHitSprite(SpriteID) returns the first SpriteID that is hit, or 0 if non Sprite is hit

We have:
GetSpriteHitTest(SpriteID, x, y)
GetSpriteHit(x, y)
GetSpriteHitGroup(group, x, y)
GetSpriteHitCategory(categories, x, y)

If we have a grid, it would be no problem, the question is, would it be possible, to have a rotated Sprite surface and maybe a player without the need of Box2D or somewhat, and be able to check, if a collision is there and when, with what Sprite?

For a Mouse-Pointer it is possible to use GetSpriteHit(x,y) and I would get the SpriteID, what if my MousePointer, would be a Circle. Can't I ask, if my Sprite on position X, Y is hitting "something" and please tell me, what ID this colliding Sprite has?

We have some other commands:

GetSpriteCollision (SpriteID1, SpriteID2)
GetSpriteContactWorldX ()
GetSpriteContactWorldY ()
GetSpriteContactSpriteID2()

Maybe I am looking for GetSpriteContactSpriteID2()
"Returns the ID of the other Sprite involved in this contract."

But in which contact? It is under 2DPhysics, so I guess, it works only with Physics-ON.

So I guess, I would use a combination of a Grid-Array and ask for integer GetSpriteCollision( iSprite1, iSprite2 )
If I am in a specific Grid-Sector / field.

But still don't know, if a rotated Sprite could be detected acuratly this way.

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Xaby

FPSC Reloaded TGC Backer

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Years of Service

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Joined: 17th Apr 2007

Location: Berlin

Posted: 15th Dec 2019 19:53 Edited at: 15th Dec 2019 20:21

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Used an array for collision.

// Project: ElectroCat 
// Created: 19-12-10

// show all errors

SetErrorMode(2)

// set window properties
SetWindowTitle( "ElectroCat" )
SetWindowSize( 1280, 720, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1920, 1080 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 600, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 )

global imgRed
global imgGreen
global imgPlayer

imgDark  = CreateImageColor( 20, 20, 20,255) // dark_grey
imgLight = CreateImageColor( 30, 30, 30,255)
imgRed   = CreateImageColor(100, 0, 0,255)
imgGreen = CreateImageColor(  0, 255, 0,255)

imgPlayer = CreateImageColor(0, 100, 100,255)

global xoff
global yoff

xoff = 160-64
yoff = 28
yoffp = 28+32

global xsize
global ysize
xsize = 64
ysize = 64

global xmax
global ymax

xmax = 24+2+1
ymax = 14+2+1

global nLevelHeight
nLevelHeight = ymax
global nLevelWidth
nLevelWidth = xmax

Type GameObject
  SpriteID as integer
  Solid as integer // 0 / 1, what about Dynamic Objects?
  value as integer
EndType

Type GamePlayer
	PosX# as float
	PosY# as float
	newPosX# as float
	newPosY# as float
	VelX# as float
	VelY# as float
	SpriteID as integer
	
EndType

global MapSpr as GameObject []

For y=0 to ymax-1 // offset by 1/2, more like 28 or 36
  	For x=0 to xmax-1

tempObject as GameObject

If (y=0) or (y=ymax-1) or (x=0) or (x=xmax-1)
     sprID = CreateCollisionBox()
     tempObject.Solid = 1
   Else	
   	If mod(x,2)=0 and mod(y,2)=0
   	  sprID = CreateCollisionBox()
   	  tempObject.Solid = 1
   	ElseIf mod((x*(xmax+1)+y),2)=0
			sprID = CreateSprite(imgDark)
			tempObject.Solid = 0
		Else
			sprID = CreateSprite(imgLight)		
			tempObject.Solid = 0
		EndIf	
	EndIf	
	
	
	SetSpritePosition(sprID,xoff+xsize*x,yoff+ysize*y)
	SetSpriteSize(sprID,xsize,ysize)
	
	
	tempObject.SpriteID = sprID
	
	MapSpr.Insert(tempObject)
	
	
  Next
Next

x = 7
y = 8

sprPlayerCollision = CreateSprite(imgPlayer)
SetSpriteSize(sprPlayerCollision,64,64)
SetSpriteShapeCircle(sprPlayerCollision,0,0,30)
SetSpriteCategoryBits( sprPlayerCollision, 2 )

//SetSpriteOffset(sprPlayerCollision,0,0)
SetSpritePosition(sprPlayerCollision,xoff+xsize*x,yoff+ysize*y)

/*
sprPlayer = CreateSprite(imgPlayer) 
SetSpriteSize(sprPlayer,64,96)
SetSpritePosition(sprPlayer,xoff+xsize*x,yoffp+ysize*y)
*/

SetPhysicsDebugOn()

global speed# // --> pro Player maybe different per item
speed# = 300
global gVelX# = 6.0
global gVelY# = 6.0

global vecPlayers as GamePlayer[]

tempPlayer as GamePlayer

tempPlayer.SpriteID = sprPlayerCollision
tempPlayer.NewPosX# = 7
tempPlayer.NewPosY# = 8

tempPlayer.PosX# = 7
tempPlayer.PosY# = 8

tempPlayer.VelX# = 0
tempPlayer.VelY# = 0

vecPlayers.insert(tempPlayer)

fOffsetX = 0
fOffsetY = 0

pOffsetX = xoff
pOffsetY = yoff

x as integer
y as integer

do
    Print( Str(ScreenFPS(),2) )
    
       
    
    for p = 0 to 0
    	
      vecPlayers[p].VelX# = 0
    	vecPlayers[p].VelY# = 0
    	x = 0 // cast integer
    	y = 0 // cast integer
    	
    
    	If (GetRawKeyState(37)) // Left
    		vecPlayers[p].VelX# = -gVelX#
    	EndIf
    	If (GetRawKeyState(38)) // Up
    		vecPlayers[p].VelY# = -gVelY#
    	EndIf
    	If (GetRawKeyState(39)) // Right
    	   vecPlayers[p].VelX# = gVelX#
    	EndIf
    	If (GetRawKeyState(40)) // Down
    		vecPlayers[p].VelY# = gVelY#
    	EndIf
    
    vecPlayers[p].newPosX# = vecPlayers[p].PosX# + vecPlayers[p].VelX# * GetFrameTime() 
    vecPlayers[p].newPosY# = vecPlayers[p].PosY# + vecPlayers[p].VelY# * GetFrameTime()
    
    // Collisions    
    
    if (vecPlayers[p].VelX# <= 0)    
    	Print("Left")
    	Print(Str(GetTile( vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.0) <> 0 or  GetTile(vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.9) ))
       if GetTile( vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.0) <> 0 or  GetTile(vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.9) <> 0
       	       	
    		vecPlayers[p].newPosX# =  trunc(vecPlayers[p].newPosX#)+1
    		vecPlayers[p].VelX# = 0
    	 endif
    else
    	if GetTile(vecPlayers[p].newPosX#+1.0,vecPlayers[p].PosY# + 0.0) <>0 or GetTile(vecPlayers[p].newPosX#+1.0,vecPlayers[p].PosY# +0.9) <>0
    		vecPlayers[p].newPosX# =  trunc(vecPlayers[p].newPosX#) +0
    		vecPlayers[p].VelX# = 0
    	 endif
    endif
    
    if (vecPlayers[p].VelY# <= 0)        	    	
       if GetTile( vecPlayers[p].newPosX#+0.0,vecPlayers[p].NewPosY# +0.0) <> 0 or  GetTile(vecPlayers[p].newPosX#+0.9,vecPlayers[p].NewPosY# +0) <> 0
       	       	
    		vecPlayers[p].newPosY# =  trunc(vecPlayers[p].newPosY#)+1
    		vecPlayers[p].VelY# = 0
    	 endif
    else
    	if GetTile(vecPlayers[p].newPosX#+0.0,vecPlayers[p].NewPosY# + 1.0) <>0 or GetTile(vecPlayers[p].newPosX#+0.9,vecPlayers[p].NewPosY# +1) <>0
    		vecPlayers[p].newPosY# =  trunc(vecPlayers[p].newPosY#) +0
    		vecPlayers[p].VelY# = 0
    	 endif
    endif
    
    
    
        
    
	vecPlayers[p].PosX# = vecPlayers[p].newPosX#
	vecPlayers[p].PosY# = vecPlayers[p].newPosY#
    
    
    SetSpritePosition(vecPlayers[p].SpriteID,(vecPlayers[p].PosX#-0) * xsize+pOffsetX,(vecPlayers[p].PosY#-0) * ysize+pOffsetY)
    
    
    next
    
    /*
    
    If (GetRawKeyState(37))
    	MovePlayer(sprPlayerCollision,-1,0)
    EndIf
    If (GetRawKeyState(38))
    	MovePlayer(sprPlayerCollision,0,-1)
    EndIf
    If (GetRawKeyState(39))
    	MovePlayer(sprPlayerCollision, 1,0)
    EndIf
    If (GetRawKeyState(40))
    	MovePlayer(sprPlayerCollision, 0,1)
    EndIf
    
    MovePlayer(sprPlayerCollision,0,0)
    
    */
    
    /*
    KEY_LEFT         37
    KEY_UP           38
    KEY_RIGHT        39
    KEY_DOWN         40
    */
    
    
    
    Sync()
loop

Function GetTile(x as float, y as float)	
	ix = trunc(x) // very important
	iy = trunc(y) // very important
	
	if (ix>=0 and ix <nLevelWidth and iy>=0 and iy < nLevelHeight)
	  value = MapSpr[iy*nLevelWidth+ix].Solid // maybe have to change to Value
	else	
	  value = -1
	endif
EndFunction value

Function MovePlayer(sprID,x#,y#)

Print(GetSpriteX(sprID))
  Print(GetSpriteY(sprID))
    
    // xoff+xsize*x    
    
  //pos = mod(y#/ysize,xmax)+ x#/xsize 
  xs = (GetSpriteX(sprID) - xoff) / xsize 
  ys = (GetSpriteY(sprID) - yoff) / ysize

minXp = xs-1
  maxXp = xs+1
  minYp = ys-1
  maxYp = ys+1
  
  for Xp=minXp to maxXp
  for Yp=minYp to maxYp 
    pos = xmax * Yp + Xp
    if pos>=0 and pos<= MapSpr.length    	  	 	
  	 	tempObject as GameObject
  	 	tempObject = MapSpr[pos]   
  	 	If tempObject.Solid = 1
  	 		If GetSpriteExists(tempObject.SpriteID)
  	 			if GetSpriteCollision( sprID, tempObject.SpriteID)  	 	
  					// SetSpriteImage(sprID,imgRed)  
  					// Print("HIT!!!: "+Str(tempObject.SpriteID))  					
  					
  	 			else	
  					// SetSpriteImage(sprID,imgPlayer)	
  					//SetSpriteImage(tempSpr,imgGreen)        
  					
  					
			   endIf
    		endif
    	endif
    endif
  next
  next
	
	//SetSpritePosition(sprID,GetSpriteX(sprID)+x#*	speed#*GetFrameTime(),GetSpriteY(sprID)+y#*	speed#*GetFrameTime())	
	
	// ->
	
	
	/*
	
	If GetSpriteHitCategory(GetSpriteX(sprID)+x#*GetFrameTime()+GetSpriteWidth(sprID),GetSpriteY(sprID)+y#*GetFrameTime()+GetSpriteHeight(sprID),2)		
		SetSpriteImage(sprID,imgGreen)
	Else
		SetSpriteImage(sprID,imgPlayer)	
	EndIf	
	
	*/

EndFunction

Function CreateCollisionBox()
	sprID = CreateSprite(imgRed)
	SetSpriteOffset(sprID,0,0)   
	SetSpriteShapeBox(sprID,0,0,64,64,0)
   SetSpriteCategoryBits( sprID, 2 )	
EndFunction sprID

+ Code Snippet


// Project: ElectroCat 
// Created: 19-12-10

// show all errors

SetErrorMode(2)

// set window properties
SetWindowTitle( "ElectroCat" )
SetWindowSize( 1280, 720, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1920, 1080 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 600, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 )

global imgRed
global imgGreen
global imgPlayer

imgDark  = CreateImageColor( 20, 20, 20,255) // dark_grey
imgLight = CreateImageColor( 30, 30, 30,255)
imgRed   = CreateImageColor(100, 0, 0,255)
imgGreen = CreateImageColor(  0, 255, 0,255)

imgPlayer = CreateImageColor(0, 100, 100,255)

global xoff
global yoff

xoff = 160-64
yoff = 28
yoffp = 28+32

global xsize
global ysize
xsize = 64
ysize = 64

global xmax
global ymax

xmax = 24+2+1
ymax = 14+2+1

global nLevelHeight
nLevelHeight = ymax
global nLevelWidth
nLevelWidth = xmax


Type GameObject
  SpriteID as integer
  Solid as integer // 0 / 1, what about Dynamic Objects?
  value as integer
EndType

Type GamePlayer
	PosX# as float
	PosY# as float
	newPosX# as float
	newPosY# as float
	VelX# as float
	VelY# as float
	SpriteID as integer
	
EndType


global MapSpr as GameObject []


  For y=0 to ymax-1 // offset by 1/2, more like 28 or 36
  	For x=0 to xmax-1

	tempObject as GameObject


   If (y=0) or (y=ymax-1) or (x=0) or (x=xmax-1)
     sprID = CreateCollisionBox()
     tempObject.Solid = 1
   Else	
   	If mod(x,2)=0 and mod(y,2)=0
   	  sprID = CreateCollisionBox()
   	  tempObject.Solid = 1
   	ElseIf mod((x*(xmax+1)+y),2)=0
			sprID = CreateSprite(imgDark)
			tempObject.Solid = 0
		Else
			sprID = CreateSprite(imgLight)		
			tempObject.Solid = 0
		EndIf	
	EndIf	
	
	
	SetSpritePosition(sprID,xoff+xsize*x,yoff+ysize*y)
	SetSpriteSize(sprID,xsize,ysize)
	
	
	tempObject.SpriteID = sprID
	
	MapSpr.Insert(tempObject)
	
	
  Next
Next

x = 7
y = 8

sprPlayerCollision = CreateSprite(imgPlayer)
SetSpriteSize(sprPlayerCollision,64,64)
SetSpriteShapeCircle(sprPlayerCollision,0,0,30)
SetSpriteCategoryBits( sprPlayerCollision, 2 )	

//SetSpriteOffset(sprPlayerCollision,0,0)
SetSpritePosition(sprPlayerCollision,xoff+xsize*x,yoff+ysize*y)

/*
sprPlayer = CreateSprite(imgPlayer) 
SetSpriteSize(sprPlayer,64,96)
SetSpritePosition(sprPlayer,xoff+xsize*x,yoffp+ysize*y)
*/

SetPhysicsDebugOn()

global speed# // --> pro Player maybe different per item
speed# = 300
global gVelX# = 6.0
global gVelY# = 6.0

global vecPlayers as GamePlayer[]



tempPlayer as GamePlayer

tempPlayer.SpriteID = sprPlayerCollision
tempPlayer.NewPosX# = 7
tempPlayer.NewPosY# = 8

tempPlayer.PosX# = 7
tempPlayer.PosY# = 8

tempPlayer.VelX# = 0
tempPlayer.VelY# = 0


vecPlayers.insert(tempPlayer)

fOffsetX = 0
fOffsetY = 0

pOffsetX = xoff
pOffsetY = yoff

x as integer
y as integer


do
    Print( Str(ScreenFPS(),2) )
    
       
    
    for p = 0 to 0
    	
      vecPlayers[p].VelX# = 0
    	vecPlayers[p].VelY# = 0
    	x = 0 // cast integer
    	y = 0 // cast integer
    	
    
    	If (GetRawKeyState(37)) // Left
    		vecPlayers[p].VelX# = -gVelX#
    	EndIf
    	If (GetRawKeyState(38)) // Up
    		vecPlayers[p].VelY# = -gVelY#
    	EndIf
    	If (GetRawKeyState(39)) // Right
    	   vecPlayers[p].VelX# = gVelX#
    	EndIf
    	If (GetRawKeyState(40)) // Down
    		vecPlayers[p].VelY# = gVelY#
    	EndIf
    
    vecPlayers[p].newPosX# = vecPlayers[p].PosX# + vecPlayers[p].VelX# * GetFrameTime() 
    vecPlayers[p].newPosY# = vecPlayers[p].PosY# + vecPlayers[p].VelY# * GetFrameTime()
    
    // Collisions    
    
    if (vecPlayers[p].VelX# <= 0)    
    	Print("Left")
    	Print(Str(GetTile( vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.0) <> 0 or  GetTile(vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.9) ))
       if GetTile( vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.0) <> 0 or  GetTile(vecPlayers[p].newPosX#+0.0,vecPlayers[p].PosY# +0.9) <> 0
       	       	
    		vecPlayers[p].newPosX# =  trunc(vecPlayers[p].newPosX#)+1
    		vecPlayers[p].VelX# = 0
    	 endif
    else
    	if GetTile(vecPlayers[p].newPosX#+1.0,vecPlayers[p].PosY# + 0.0) <>0 or GetTile(vecPlayers[p].newPosX#+1.0,vecPlayers[p].PosY# +0.9) <>0
    		vecPlayers[p].newPosX# =  trunc(vecPlayers[p].newPosX#) +0
    		vecPlayers[p].VelX# = 0
    	 endif
    endif
    
    if (vecPlayers[p].VelY# <= 0)        	    	
       if GetTile( vecPlayers[p].newPosX#+0.0,vecPlayers[p].NewPosY# +0.0) <> 0 or  GetTile(vecPlayers[p].newPosX#+0.9,vecPlayers[p].NewPosY# +0) <> 0
       	       	
    		vecPlayers[p].newPosY# =  trunc(vecPlayers[p].newPosY#)+1
    		vecPlayers[p].VelY# = 0
    	 endif
    else
    	if GetTile(vecPlayers[p].newPosX#+0.0,vecPlayers[p].NewPosY# + 1.0) <>0 or GetTile(vecPlayers[p].newPosX#+0.9,vecPlayers[p].NewPosY# +1) <>0
    		vecPlayers[p].newPosY# =  trunc(vecPlayers[p].newPosY#) +0
    		vecPlayers[p].VelY# = 0
    	 endif
    endif
    
    
    
        
    
	vecPlayers[p].PosX# = vecPlayers[p].newPosX#
	vecPlayers[p].PosY# = vecPlayers[p].newPosY#
    
    
    SetSpritePosition(vecPlayers[p].SpriteID,(vecPlayers[p].PosX#-0) * xsize+pOffsetX,(vecPlayers[p].PosY#-0) * ysize+pOffsetY)
    
    
    next
    
    /*
    
    If (GetRawKeyState(37))
    	MovePlayer(sprPlayerCollision,-1,0)
    EndIf
    If (GetRawKeyState(38))
    	MovePlayer(sprPlayerCollision,0,-1)
    EndIf
    If (GetRawKeyState(39))
    	MovePlayer(sprPlayerCollision, 1,0)
    EndIf
    If (GetRawKeyState(40))
    	MovePlayer(sprPlayerCollision, 0,1)
    EndIf
    
    MovePlayer(sprPlayerCollision,0,0)
    
    */
    
    /*
    KEY_LEFT         37
    KEY_UP           38
    KEY_RIGHT        39
    KEY_DOWN         40
    */
    
    
    
    Sync()
loop


Function GetTile(x as float, y as float)	
	ix = trunc(x) // very important
	iy = trunc(y) // very important
	
	if (ix>=0 and ix <nLevelWidth and iy>=0 and iy < nLevelHeight)
	  value = MapSpr[iy*nLevelWidth+ix].Solid // maybe have to change to Value
	else	
	  value = -1
	endif
EndFunction value

Function MovePlayer(sprID,x#,y#)

  Print(GetSpriteX(sprID))
  Print(GetSpriteY(sprID))
    
    // xoff+xsize*x    
    
  //pos = mod(y#/ysize,xmax)+ x#/xsize 
  xs = (GetSpriteX(sprID) - xoff) / xsize 
  ys = (GetSpriteY(sprID) - yoff) / ysize   

  minXp = xs-1
  maxXp = xs+1
  minYp = ys-1
  maxYp = ys+1
  
  for Xp=minXp to maxXp
  for Yp=minYp to maxYp 
    pos = xmax * Yp + Xp
    if pos>=0 and pos<= MapSpr.length    	  	 	
  	 	tempObject as GameObject
  	 	tempObject = MapSpr[pos]   
  	 	If tempObject.Solid = 1
  	 		If GetSpriteExists(tempObject.SpriteID)
  	 			if GetSpriteCollision( sprID, tempObject.SpriteID)  	 	
  					// SetSpriteImage(sprID,imgRed)  
  					// Print("HIT!!!: "+Str(tempObject.SpriteID))  					
  					
  	 			else	
  					// SetSpriteImage(sprID,imgPlayer)	
  					//SetSpriteImage(tempSpr,imgGreen)        
  					
  					
			   endIf
    		endif
    	endif
    endif
  next
  next
	
	//SetSpritePosition(sprID,GetSpriteX(sprID)+x#*	speed#*GetFrameTime(),GetSpriteY(sprID)+y#*	speed#*GetFrameTime())	
	
	// ->
	
	
	/*
	
	If GetSpriteHitCategory(GetSpriteX(sprID)+x#*GetFrameTime()+GetSpriteWidth(sprID),GetSpriteY(sprID)+y#*GetFrameTime()+GetSpriteHeight(sprID),2)		
		SetSpriteImage(sprID,imgGreen)
	Else
		SetSpriteImage(sprID,imgPlayer)	
	EndIf	
	
	*/

EndFunction

Function CreateCollisionBox()
	sprID = CreateSprite(imgRed)
	SetSpriteOffset(sprID,0,0)   
	SetSpriteShapeBox(sprID,0,0,64,64,0)
   SetSpriteCategoryBits( sprID, 2 )	
EndFunction sprID

Arrow keys to move. Tried to solve the collision with an array. (like here in C++ Code-It-Yourself! Simple Tile Based Platform Game #1 from javidx9)

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Golelorn

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Posted: 19th Dec 2019 04:48

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I know I am late to the party. Have been working, and that kinda bs.

I need help with AI movements. I can't get it down. Honestly, its made me stop programming, altogether. There is so little info out there. I have no idea what I am doing. I get the macro part. But, I can not perfect the minute important stuff. Its got me really down. I haven't touched AppGameKit in like 6 months, because I can't figure this out.

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Santman

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Posted: 19th Dec 2019 23:21

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I'm going to take a break from the world builder over Christmas, so will have a bash at a per pixel, shader based sprite collision checker. I've thought it out in my head, and it should be plenty fast enough for multiple checks on a mobile I think. So for me theres two types: how far below point Y is the ground, and has one sprite collided with another for bullets etc.

Golelorn, what kind of AI movement? Tjeres a couple of A* payjmapping style algorithms in the forums already, and sure someone did flood filling aswell.

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Xaby

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Posted: 20th Dec 2019 12:53

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@Golelorn
Yeah, sometimes it could be very hard. I also miss some examples for easy games like Platformers, and there is Game Maker Studio a little bit better also with YouTube tutorials.

@Santman
Would be nice, to have some basic Platformer, maybe with an enemy, or some ladders or what. I know, it is all possible with arrays and block-tile-based layouts.

And seeing *A in action in App Game Kit would be also very cool. Could be used for so many game styles. Puzzles, Strategy and others.

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Santman

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Posted: 20th Dec 2019 13:19

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A basic 2d platformer? I did one before and uploaded the code, will dig it out.

I also have an A* routine in two flavours that I can upload, one is a single process, the other works like threading so that complex routes can be done over multiple frames if needed.

Will try and do them later.

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Xaby

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Posted: 6th Jan 2020 20:25

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@Santman

I saw that. Maybe that could inspire us. But it is tilebased.

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Santman

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Posted: 6th Jan 2020 20:52

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Is that your game Xaby? That's awesome - I especially love the sound effects of the torches being lit.

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Xaby

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Posted: 7th Jan 2020 08:18 Edited at: 7th Jan 2020 08:20

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@Santman,

no, is not mine. But would be nice, to have a blue-print for such game. I started out with some tutorial in C++ and got it also working in App Game Kit Tier 2 C++, and also tried to re-do it in AppGameKit Tier 1 Basic. An RPG and a Platformer are nearly the same, if you only add graivity.
At the moment I will finish my Bomberman-Clone and after that, I will try a platformer, also tile-based.

My dream would be something like "Rayman Legends", I could create some graphics in photoshop, and also placethem with my own "leveleditor", but still don't know, how I would do the collisions in the best way. It is much more easy in a grid, where you know, that you only have to check some of the moving objects against the 4 directions.
But maybe it would be the same with free-rotated Sprites. And my moving NPCs and and Player-Characters would need about "8" colliders, or maybe only 4 without the edges. Or the best way for that would be, to use Box2D build in functions. Can't tell. I guess, slopes are also possible with tile-based collisions.

That was my project
https://forum.thegamecreators.com/thread/225169

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Santman

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Posted: 7th Jan 2020 08:50

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Well, over been kinda busy with the world builder but now that's been shelved I'll come back to this thread, and have a look at my platform game code. Something like Rayman would be fairly easy now I think.....I'd use 3D and just make a shader to reduce the Z buffer to flat (I have one alreasy), sonit would look 2D but would give perfect 3D collisions.

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Golelorn

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Posted: 14th Jan 2020 23:54 Edited at: 15th Jan 2020 00:02

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A* is just the beginning.

The mobs have to travel around each other, travel around obstacles in a sensible fashion, and surround a target that might be changing position constantly. I have some videos on here of what I have been able to do, but its not good enough.
https://forum.thegamecreators.com/thread/224645

The bottom one is pretty much where I am stuck. I took a break form it, and can't get motivated to get back to it.

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AppGameKit Classic Chat / What basic engine would people like to see developed?