Following a path?

Maxwello

Ah, that's fab and even I can see exactly what's going on with that

Martin

Thats basically a nice implementation of what I was talking to you about earlier. And I swear I had not read that then !

You can ignore the 45 degree if you want, but why limit yourself? Add more angles!

doumdoum

For a galaxian or galaga like path, you can use SetSpriteRotationSpeed() instead of SetSpriteRotation().
Simply use small angles between -4.0 and 4.0.
If you feel adventurous, use Structures or Vectors.

I didn't see a SetSpriteAcceleration() command in the doc.
It would be very usefull for smooth movements as in supersprint ...

SteveZX81

A little peek at what I'm doing. I have something following one trace right now.

xevdev

@SteveZX81
I can't see it is there a video?

SteveZX81

yes its a small 9 second clip. not sure why it's not working for you.

xevdev

It's on twitter I see it now

xevdev

I should say I can't see it here though

xevdev

Yep I can see it thanks
I once used a string to do a galaga type game for the aliens
"llrrffss etc
Each letter was
L = turn left 5 deg
R = turn right 5 deg
F = go straight
S = anything you want as in any letter could have a response _ fire or change response
So like above just scrolled through the string and adjusted the sprite accordingly
In your case as your only following a predefined path probably could reverse it to draw path that you are following.
Using 90 deg but
I found it was faster to type into a string than put in numbers and play animation

doumdoum

Yes, it's tedious to type numbers.
Here's what you can do with only 6 numbers in arrays :

And the code :

MikeDX

If you share that project I will paste the code in here as text for you :)

doumdoum

Just shared it.

SteveZX81

That's really helpful, thank you so much doumdoum!

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.