Following a path?

MikeDX

A more copy paste friendly version for you:

// Simple path with arrays in Fuze for Nintendo Switch
// by doumdoum
radians( 0 )  
image = loadImage( "Untied Games/Enemy small top C", false )
ship = createSprite()
SetSpriteImage( ship, image )
SetSpriteLocation( ship, -64, 170 )
SetSpriteScale( ship, 1, 1 )
SetSpriteRotation( ship, 1 )

// 3 arrays to store your path
speeds = [  400, 400 ]  // Speed of Movements
turns  = [ -4.0,-0.5 ]  // Angles variations in degrees
rpeats = [   90,  45 ]  // Iterations

completedPaths = 0 // nb of completed paths   
index   = -1       // Index in arrays
counter =  0       // iterations to do for each movement
currentAngle = 70 

ResetPath()
UpdatePath()

Loop
	// comment these next 4 lines to keep the path  
    Clear()
	PrintAt( 1, 1, "counter    " ,counter )
	PrintAt( 1, 2, "compleded  " , completedPaths )
	PrintAt( 1, 3, "Move index ", index, "  angle ", currentAngle )
	PrintAt( 1, 4, "Speed      ", speeds[index], "  Sprite rotation ", GetSpriteRotation( ship ) )
	
	UpdatePath()
	UpdateSprites()
    DrawSprites()
    Update()
Repeat


Function ResetPath()
// call this function when launching a ship
	completedPaths = 0  // nb of completed paths   	
	index          = -1 // Index in arrays
	counter        =  0 // iterations to do for each movement
	currentAngle   = 70 
	SetSpriteLocation( ship, -32, 170 )
	SetSpriteScale( ship, 1, 1 )
	SetSpriteRotation( ship, 1 )
	SetSpriteRotation( ship, currentAngle )
Return Void  


Function UpdatePath()
// call this function every frame
	counter -= 1
	If counter<=0 Then
		index += 1          // next movement
		If index>len(speeds)-1 Then 
			index = 0
			completedPaths += 1 // count the paths completed or initied
		Endif  
		counter = rpeats[index]		
	Endif

	//currentAngle = currentAngle + turns[index]
	currentAngle = Cycle( currentAngle, 0.0, 360.0, turns[index] )

	SetSpriteRotation( ship, currentAngle-90 ) // -90 to correct sprite design 
	dx = cos( currentAngle ) * speeds[index] 
	dy = sin( currentAngle ) * speeds[index]
	SetSpriteSpeed( ship, dx, dy )	

	If completedPaths>=6 Then
		// reset sprite position and path
		ResetPath()
	Endif 

Return Void


Function Cycle( lvalue, lstart, lend, lstep )
// Cycle a value between lstart and lend, by adding lstep 
	lvalue += lstep
	If lvalue>=lend Then
		lvalue = lvalue - (lend - lstart)
	Else
		If lvalue<=lstart Then		 
			lvalue = lvalue + (lend - lstart)
		Endif
	Endif	
Return lvalue

SteveZX81

Thanks for all the help guys! I now have my shots (just one currently) following the traces just fine!

SteveZX81

Sorry but my brain is not firing on all cylinders today and I'm struggling to change the code from a single path (one shot fired) to multiple ones at the same time (several shots fired)

Here is the code for the single one and it works perfectly

This is my last effort at doing multiple ones via a loop

Which does not work at all, everything goes crazy.

I'm obviously missing something here, if someone could give me a hint it would be great. thanks!

pianofire

It is difficult to say without seeing more of the code and knowing what the intention was e.g what are the initial values of index and counter?

Just a minor observation but the array is called rpeats and not repeats is it?

Jaywalker

Just make sure, that your values will take over into the next shot, when you set them, so for example stop will always be true once it was true for the first time in your loop

pianofire

@SteveZX81 share your code Steve and I will take a look

SteveZX81

@pianofire okay its shared (named chip) as the code stands it shoots single shots which work fine
dpad to change selection and press 'Y' to shoot.

of course when there is one shot on the move and you press fire, that shot vanishes and your new one replaces it. that's why I wanted to add more (up to say 20)

There is no need to fix this but if you wish to look at the code as it is, its there.

pianofire

@SteveZX81 Hi Steve, so I haven't got to the bottom of this yet but one observation is that in the traceshoot function you are only ever setting the location of the pshot sprite (not the ones stored in the shots array) so they will always be starting from -100, 0. I guess that you probably need a shot counter that gets passed into here?

SteveZX81

in that version of the code yes. in all the attempts I've made to make multiple shots, I have changed all the pshot entries to shots[shotcnt]. but alas no joy.
don't worry about it, it was just a silly game idea anyway ;)

Martin

how are you creating the shots array? and does it by anychance have createSprite() inside the array ?

pianofire

@SteveZX81 Ok no problem. I think that the idea has potential. If I get some more time I might have another look.

SteveZX81

@Martin The shots array is created like this (and yes)
shots = []
shotcnt = 0
for i = 0 to 20 loop
shots[i] = createsprite
..and then 3 lines for setting the sprite image, animation and scale followed by
repeat

The sprites do show up fine, but don't follow my traces (like the shared single trace code does)

Martin

OK, that's fine - there is a known issue (IMO) if the sprites had been created a different way so I just wanted to check. As you were...