help with bullets moving in the direction player aims (2d game)

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dandrews

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Posted: 29th Nov 2021 04:25

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im having trouble with the math of how to get a bullet to move in the direction a player aims with a 2d sprite. i can get the player sprite to rotate to the correct angle but when it come time for the bullets to move i cant get it down. i was using a virtual joystick

function GetVirtualJoystickAngle2(Joystick2) //offset 0 or 1
	local result as float
	local x1# as float
	local y1# as float
	local x2# as float
	local y2# as float
	x1# = 0
	y1# = 0
	x2# = GetVirtualJoystickX(Joystick2)
	y2# = GetVirtualJoystickY(Joystick2)
	result = atanfull (x2# - x1#, y2# - y1#)

function UpdateBullets ( )
	local i as integer
	local j as integer
	local y as integer
	local k as integer
	local l as integer
	JoystickAngle2 = GetVirtualJoystickAngle2(Joystick2)
	if GetVirtualJoystickX(Joystick2)>0
		gunstick1 = 0.99
		endif
		if GetVirtualJoystickX(Joystick2)<0
			gunstick1 = -0.99
			endif
			if GetVirtualJoystickX(Joystick2)=0
			gunstick1 = 0
			endif
// increment the timer to control when the bullet should fire
    gun.fireTimer = gun.fireTimer + 0.01
// run through all the bullets
for i = 0 to gun.bullets.length
     gun.bullets[i].gunbulletx=GetSpritex ( gun.bullets [ i ].sprite )
    gun.bullets[i].gunbullety=GetSpritey ( gun.bullets [ i ].sprite )
    
// if the state is 0 then this bullet is available
if gun.bullets [ i ].state = 0
if gun.fireTimer >= gun.rps and gunstick1 + GetVirtualJoystickY(Joystick2) <> 0
// reset the bullet, set the state to 1 and reset the timer
     //PlaySound(2,25,0)	
	ResetBullets (i,1)
    gun.bullets[i].state = 1
    gun.fireTimer = 0.0
    gun.bullets[i].anglex= Gun.Bullets [ i ].speed * gunstick1
	gun.bullets[i].angley= Gun.Bullets [ i ].speed * GetVirtualJoystickY(Joystick2)
 endif
// when the state is 1 the bullet has been fired
if gun.bullets [ i ].state = 1
// move the bullet up the screen
   SetSpritePosition ( gun.bullets [ i ].sprite,gun.bullets[i].gunbulletx  + gun.bullets[i].anglex, gun.bullets[i].gunbullety + gun.bullets[i].angley)
// check for the bullet leaving the screen
	if gunwheel[3].active=1
if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-800 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-800
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
else
	if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-1200 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-1200
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
	endif
endif
next i
endfunction
//----check bullet reset------
function Resetbullets ( index as integer, visible as integer )
	bulletoff =GetWindowWidth()*0.0704
    Gun.Bullets [ index ].state = 0
    Gun.Bullets [ index ].speed = gun.speed
    SetSpriteVisible ( Gun.Bullets [ index ].sprite, visible )
endfunction

+ Code Snippet

function GetVirtualJoystickAngle2(Joystick2) //offset 0 or 1
	local result as float
	local x1# as float
	local y1# as float
	local x2# as float
	local y2# as float
	x1# = 0
	y1# = 0
	x2# = GetVirtualJoystickX(Joystick2)
	y2# = GetVirtualJoystickY(Joystick2)
	result = atanfull (x2# - x1#, y2# - y1#) 

function UpdateBullets ( )
	local i as integer
	local j as integer
	local y as integer
	local k as integer
	local l as integer
	JoystickAngle2 = GetVirtualJoystickAngle2(Joystick2)
	if GetVirtualJoystickX(Joystick2)>0
		gunstick1 = 0.99
		endif
		if GetVirtualJoystickX(Joystick2)<0
			gunstick1 = -0.99
			endif
			if GetVirtualJoystickX(Joystick2)=0
			gunstick1 = 0
			endif
// increment the timer to control when the bullet should fire
    gun.fireTimer = gun.fireTimer + 0.01
// run through all the bullets
for i = 0 to gun.bullets.length
     gun.bullets[i].gunbulletx=GetSpritex ( gun.bullets [ i ].sprite )
    gun.bullets[i].gunbullety=GetSpritey ( gun.bullets [ i ].sprite )
    
// if the state is 0 then this bullet is available
if gun.bullets [ i ].state = 0
if gun.fireTimer >= gun.rps and gunstick1 + GetVirtualJoystickY(Joystick2) <> 0
// reset the bullet, set the state to 1 and reset the timer
     //PlaySound(2,25,0)	
	ResetBullets (i,1)
    gun.bullets[i].state = 1
    gun.fireTimer = 0.0
    gun.bullets[i].anglex= Gun.Bullets [ i ].speed * gunstick1
	gun.bullets[i].angley= Gun.Bullets [ i ].speed * GetVirtualJoystickY(Joystick2)
 endif
// when the state is 1 the bullet has been fired
if gun.bullets [ i ].state = 1
// move the bullet up the screen
   SetSpritePosition ( gun.bullets [ i ].sprite,gun.bullets[i].gunbulletx  + gun.bullets[i].anglex, gun.bullets[i].gunbullety + gun.bullets[i].angley)
// check for the bullet leaving the screen
	if gunwheel[3].active=1
if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-800 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-800
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
else
	if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-1200 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-1200
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
	endif
endif
next i
endfunction
//----check bullet reset------
function Resetbullets ( index as integer, visible as integer )
	bulletoff =GetWindowWidth()*0.0704
    Gun.Bullets [ index ].state = 0
    Gun.Bullets [ index ].speed = gun.speed
    SetSpriteVisible ( Gun.Bullets [ index ].sprite, visible )
endfunction

but i would like to convert it over to use dragangle

function UpdateBullets ( )
	local i as integer
	local j as integer
	local y as integer
	local k as integer
	local l as integer
	JoystickAngle2 = GetVirtualJoystickAngle2(Joystick2)
	if GetVirtualJoystickX(Joystick2)>0
		gunstick1 = 0.99
		endif
		if GetVirtualJoystickX(Joystick2)<0
			gunstick1 = -0.99
			endif
			if GetVirtualJoystickX(Joystick2)=0
			gunstick1 = 0
			endif
// increment the timer to control when the bullet should fire
    gun.fireTimer = gun.fireTimer + 0.01
// run through all the bullets
for i = 0 to gun.bullets.length
     gun.bullets[i].gunbulletx=GetSpritex ( gun.bullets [ i ].sprite )
    gun.bullets[i].gunbullety=GetSpritey ( gun.bullets [ i ].sprite )
    
// if the state is 0 then this bullet is available
if gun.bullets [ i ].state = 0
	if gun.state_now = 'right' or gun.state_now = 'right_down'
     SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/1.3,GetSpriteY(player.id)+ GetSpriteHeight(player.id)/4)
    endif
    if gun.state_now = 'right_top'
     SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/1.3,GetSpriteY(player.id))
    endif
    if gun.state_now = 'down'
    	 SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/2,GetSpriteY(player.id)+ GetSpriteHeight(player.id)/2)
	endif
	if gun.state_now = 'top'
	SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/2,GetSpriteY(player.id))
	endif
// only fire the bullet if the fire timer is over 0.25
if gun.fireTimer >= gun.rps and gunstick1 + GetVirtualJoystickY(Joystick2) <> 0
// reset the bullet, set the state to 1 and reset the timer
     //PlaySound(2,25,0)	
	ResetBullets (i,1)
    gun.bullets[i].state = 1
    gun.fireTimer = 0.0
    gun.bullets[i].anglex= Gun.Bullets [ i ].speed * gunstick1
	gun.bullets[i].angley= Gun.Bullets [ i ].speed * GetVirtualJoystickY(Joystick2)
 endif
// when the state is 1 the bullet has been fired
if gun.bullets [ i ].state = 1
// move the bullet up the screen
   SetSpritePosition ( gun.bullets [ i ].sprite,gun.bullets[i].gunbulletx  + gun.bullets[i].anglex, gun.bullets[i].gunbullety + gun.bullets[i].angley)
// check for the bullet leaving the screen
	if gunwheel[3].active=1
if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-800 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-800
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
else
	if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-1200 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-1200
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
	endif
endif
next i
endfunction
//----check bullet reset------
function Resetbullets ( index as integer, visible as integer )
	bulletoff =GetWindowWidth()*0.0704
    Gun.Bullets [ index ].state = 0
    Gun.Bullets [ index ].speed = gun.speed

SetSpriteVisible ( Gun.Bullets [ index ].sprite, visible )
endfunction

+ Code Snippet

function UpdateBullets ( )
	local i as integer
	local j as integer
	local y as integer
	local k as integer
	local l as integer
	JoystickAngle2 = GetVirtualJoystickAngle2(Joystick2)
	if GetVirtualJoystickX(Joystick2)>0
		gunstick1 = 0.99
		endif
		if GetVirtualJoystickX(Joystick2)<0
			gunstick1 = -0.99
			endif
			if GetVirtualJoystickX(Joystick2)=0
			gunstick1 = 0
			endif
// increment the timer to control when the bullet should fire
    gun.fireTimer = gun.fireTimer + 0.01
// run through all the bullets
for i = 0 to gun.bullets.length
     gun.bullets[i].gunbulletx=GetSpritex ( gun.bullets [ i ].sprite )
    gun.bullets[i].gunbullety=GetSpritey ( gun.bullets [ i ].sprite )
    
// if the state is 0 then this bullet is available
if gun.bullets [ i ].state = 0
	if gun.state_now = 'right' or gun.state_now = 'right_down'
     SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/1.3,GetSpriteY(player.id)+ GetSpriteHeight(player.id)/4)
    endif
    if gun.state_now = 'right_top'
     SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/1.3,GetSpriteY(player.id))
    endif
    if gun.state_now = 'down'
    	 SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/2,GetSpriteY(player.id)+ GetSpriteHeight(player.id)/2)
	endif
	if gun.state_now = 'top'
	SetSpritePosition(gun.bullets [ i ].sprite,getspritex(player.id)+GetSpriteWidth(player.id)/2,GetSpriteY(player.id))
	endif
// only fire the bullet if the fire timer is over 0.25
if gun.fireTimer >= gun.rps and gunstick1 + GetVirtualJoystickY(Joystick2) <> 0
// reset the bullet, set the state to 1 and reset the timer
     //PlaySound(2,25,0)	
	ResetBullets (i,1)
    gun.bullets[i].state = 1
    gun.fireTimer = 0.0
    gun.bullets[i].anglex= Gun.Bullets [ i ].speed * gunstick1
	gun.bullets[i].angley= Gun.Bullets [ i ].speed * GetVirtualJoystickY(Joystick2)
 endif
// when the state is 1 the bullet has been fired
if gun.bullets [ i ].state = 1
// move the bullet up the screen
   SetSpritePosition ( gun.bullets [ i ].sprite,gun.bullets[i].gunbulletx  + gun.bullets[i].anglex, gun.bullets[i].gunbullety + gun.bullets[i].angley)
// check for the bullet leaving the screen
	if gunwheel[3].active=1
if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-800 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+800 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-800
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
else
	if GetSpritex ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritex ( gun.bullets [ i ].sprite ) <  getspritex(player.id)-1200 or GetSpritey ( gun.bullets [ i ].sprite ) > getspritex(player.id)+1200 or GetSpritey ( gun.bullets [ i ].sprite ) <  getspritey(player.id)-1200
// reset the bullet and allow it to be used again
   ResetBullets ( i, 0 )
endif
	endif
endif
next i
endfunction
//----check bullet reset------
function Resetbullets ( index as integer, visible as integer )
	bulletoff =GetWindowWidth()*0.0704
    Gun.Bullets [ index ].state = 0
    Gun.Bullets [ index ].speed = gun.speed

    SetSpriteVisible ( Gun.Bullets [ index ].sprite, visible )
endfunction

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MadBit

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Joined: 25th Jun 2009

Location: Germany

Posted: 29th Nov 2021 04:52 Edited at: 29th Nov 2021 04:53

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When you shoot your bullet. Then save the direction in which the bullet should fly as follows.

move_x = sin(angle_player) * bullet_speed
move_y = -cos(angle_player) * bullet_speed

When moving, you only add the current position of your bullet with the direction and speed of movement.
SetSpritePosition(bullet,GetSpriteX(bullet)+move_x, GetSpriteY(bullet)+move_y)

I hope this helps.

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Virtual Nomad

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Posted: 29th Nov 2021 05:08 Edited at: 29th Nov 2021 05:12

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This post has been marked by the post author as the answer.

what madbit said (while i was writing this):

// Project: Bullet 
// Created: 2021-11-28
// By: Virtual Nomad
// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "Bullet" )
SetWindowSize( 1280,720, 0 )
SetWindowAllowResize( 1 )

// set display properties
SetVirtualResolution( 1280,720)
SetOrientationAllowed( 1, 1, 1, 1 )
SetSyncRate( 30, 0 ) 
SetScissor( 0,0,0,0 )
UseNewDefaultFonts( 1 )

CX# = 640.0	:	CY# = 360.0 //Center of Screen
Shots as Integer []
Rate# = 5.0
do
	Angle# = ATanFull(GetPointerX()-CX#, GetPointerY()-CY#)
	If GetPointerState() = 1
		shot = CreateSprite(0)	:	SetSpritePositionByOffset(shot,640,360)	:	SetSpriteAngle(shot,angle#)
		Shots.Insert(shot)
	Endif

If Shots.Length > -1
		for x = Shots.Length to 0 step -1
			ShotAngle# = GetSpriteAngle(Shots[x])
			x# = GetSpriteXByOffset(Shots[x])	:	y# = GetSpriteYByOffset(Shots[x])
			SetSpritePositionByOffset(Shots[x], x#+SIN(ShotAngle#)*Rate#, y#-COS(ShotAngle#)*Rate#)
			If GetSpriteInScreen(Shots[x]) = 0
				DeleteSprite(Shots[x])
				Shots.Remove(x)
			Endif
		next x
	Endif
	
    If GetRawKeyState(27) then Exit

Print("Shots: " + STR(Shots.Length+1))
    Print( Angle# )
    Sync()
loop

+ Code Snippet

// Project: Bullet 
// Created: 2021-11-28
// By: Virtual Nomad
// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "Bullet" )
SetWindowSize( 1280,720, 0 )
SetWindowAllowResize( 1 )

// set display properties
SetVirtualResolution( 1280,720)
SetOrientationAllowed( 1, 1, 1, 1 )
SetSyncRate( 30, 0 ) 
SetScissor( 0,0,0,0 )
UseNewDefaultFonts( 1 ) 

CX# = 640.0	:	CY# = 360.0 //Center of Screen
Shots as Integer []
Rate# = 5.0
do
	Angle# = ATanFull(GetPointerX()-CX#, GetPointerY()-CY#)
	If GetPointerState() = 1
		shot = CreateSprite(0)	:	SetSpritePositionByOffset(shot,640,360)	:	SetSpriteAngle(shot,angle#)
		Shots.Insert(shot)
	Endif

	If Shots.Length > -1
		for x = Shots.Length to 0 step -1
			ShotAngle# = GetSpriteAngle(Shots[x])
			x# = GetSpriteXByOffset(Shots[x])	:	y# = GetSpriteYByOffset(Shots[x])
			SetSpritePositionByOffset(Shots[x], x#+SIN(ShotAngle#)*Rate#, y#-COS(ShotAngle#)*Rate#)
			If GetSpriteInScreen(Shots[x]) = 0
				DeleteSprite(Shots[x])
				Shots.Remove(x)
			Endif
		next x
	Endif
	
    If GetRawKeyState(27) then Exit    

	Print("Shots: " + STR(Shots.Length+1))
    Print( Angle# )
    Sync()
loop

meanwhile, next time show a short snippet of what you're trying to achieve vs "all that other stuff" ? i couldn't bother to sift through it but had an idea of what you were trying to do

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blink0k

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Posted: 29th Nov 2021 05:30

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This uses a technique of taking a point within the bullet sprite and using that to move the bullet.
Note that using the AppGameKit angle calculations, it assumes that the sprite, when at angle zero, is pointing directly up

// Project: Lookat2d 
// Created: 21-11-29

// show all errors

SetErrorMode(2)

// set window properties
SetWindowTitle( "Lookat2d" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 )

DrawLine(0, 0, 0, 5, 0xff, 0xff, 0xff)
bullet = CreateSprite(GetImage(0, 0, 1, 5))

DrawEllipse(3, 3, 3, 3, 0xffffffff, 0xffffffff, 1)
DrawLine(3, 2, 3, 20, 0xff, 0xff, 0xff)

gun = CreateSprite(GetImage(0, 0, 7, 20))
SetSpriteOffset(gun, 3, 20)
SetSpritePosition(gun, 5, 40)

target = CreateSprite(CreateImageColor(0xff, 0, 0, 0xff))
setspriteSize(target, 10, 10)

SetSpritePosition(target, 100, 100)

bullets as integer[]

x as float
y as float
time as float
time = Timer()

do
	if GetPointerState() and Timer() - time > 0.1
		time = Timer()
		b = CloneSprite(bullet)
		SetSpritePositionByOffset(b, GetSpriteXByOffset(gun), GetSpriteYByOffset(gun))
		SetSpriteAngle(b, GetSpriteAngle(gun))
		bullets.insert(b)
	endif
	
	for i=bullets.length to 0 step -1
		b = bullets[i]
		x = GetWorldXFromSprite(b, 0, -5)
		y = GetWorldYFromSprite(b, 0, -5)
		if y > 768 or x > 1024 or GetSpriteHitTest(target, x, y)
			DeleteSprite(b)
			bullets.remove(i)
		else
			SetSpritePositionByOffset(b, x, y)
		endif
	next
	
	SetSpritePositionByOffset(target, GetPointerX(), GetPointerY())
	SetSpriteLookAt(gun, target)
	
	print(bullets.length)
    Sync()
loop

function SetSpriteLookAt(s1 as integer, s2 as integer)
	SetSpriteAngle(s1, ATanFull(GetSpriteXByOffset(s2)-GetSpriteXByOffset(s1), GetSpriteYByOffset(s2)-GetSpriteYByOffset(s1)))	
endfunction

+ Code Snippet

// Project: Lookat2d 
// Created: 21-11-29

// show all errors

SetErrorMode(2)

// set window properties
SetWindowTitle( "Lookat2d" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 )

DrawLine(0, 0, 0, 5, 0xff, 0xff, 0xff)
bullet = CreateSprite(GetImage(0, 0, 1, 5))

DrawEllipse(3, 3, 3, 3, 0xffffffff, 0xffffffff, 1)
DrawLine(3, 2, 3, 20, 0xff, 0xff, 0xff)

gun = CreateSprite(GetImage(0, 0, 7, 20))
SetSpriteOffset(gun, 3, 20)
SetSpritePosition(gun, 5, 40)

target = CreateSprite(CreateImageColor(0xff, 0, 0, 0xff))
setspriteSize(target, 10, 10)

SetSpritePosition(target, 100, 100)

bullets as integer[]

x as float
y as float
time as float
time = Timer()

do
	if GetPointerState() and Timer() - time > 0.1
		time = Timer()
		b = CloneSprite(bullet)
		SetSpritePositionByOffset(b, GetSpriteXByOffset(gun), GetSpriteYByOffset(gun))
		SetSpriteAngle(b, GetSpriteAngle(gun))
		bullets.insert(b)
	endif
	
	for i=bullets.length to 0 step -1
		b = bullets[i]
		x = GetWorldXFromSprite(b, 0, -5)
		y = GetWorldYFromSprite(b, 0, -5)
		if y > 768 or x > 1024 or GetSpriteHitTest(target, x, y)
			DeleteSprite(b)
			bullets.remove(i)
		else
			SetSpritePositionByOffset(b, x, y)
		endif
	next
	
	SetSpritePositionByOffset(target, GetPointerX(), GetPointerY())
	SetSpriteLookAt(gun, target)
	
	print(bullets.length)
    Sync()
loop

function SetSpriteLookAt(s1 as integer, s2 as integer)
	SetSpriteAngle(s1, ATanFull(GetSpriteXByOffset(s2)-GetSpriteXByOffset(s1), GetSpriteYByOffset(s2)-GetSpriteYByOffset(s1)))	
endfunction

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dandrews

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Posted: 30th Nov 2021 18:35 Edited at: 30th Nov 2021 18:36

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thank you all for the help! i did edit the code provides by nomad and was able to get it working

do
	local angle# as float
	 Angle# = ATanFull(GetPointerX()-CX#, GetPointerY()-CY#)
   gun.fireTimer = gun.fireTimer + 0.01
        local x as integer 
  for x = 0 to gun.Bullets.length  
  If GetPointerState() = 1
  
        	if gun.bullets[x].state = 0 and gun.fireTimer >= gun.rps
        		gun.bullets[x].state = 1
        		gun.bullets[x].angle = GetDragAngle()
        		gun.fireTimer = 0.0
        		Resetbullets ( x, 1)
        	endif
        endif
next x
        for x = 0 to gun.Bullets.length
            
            gun.bullets[x].gunbulletx = GetSpriteXByOffset(gun.bullets[x].sprite)   :   gun.bullets[x].gunbullety = GetSpriteYByOffset(gun.bullets[x].sprite)
            SetSpritePositionByOffset(gun.bullets[x].sprite, gun.bullets[x].gunbulletx+SIN(gun.bullets[x].angle)*Rate#, gun.bullets[x].gunbullety-COS(gun.bullets[x].angle)*Rate#)
            If GetSpriteInScreen(gun.bullets[x].sprite) = 0
            	gun.bullets[x].state= 0
                Resetbullets ( x, 0)
            Endif
        next x
    If GetRawKeyState(27) then Exit   
    Sync()
		loop

+ Code Snippet

 
do
	local angle# as float
	 Angle# = ATanFull(GetPointerX()-CX#, GetPointerY()-CY#)
   gun.fireTimer = gun.fireTimer + 0.01
        local x as integer 
  for x = 0 to gun.Bullets.length  
  If GetPointerState() = 1
  
        	if gun.bullets[x].state = 0 and gun.fireTimer >= gun.rps
        		gun.bullets[x].state = 1
        		gun.bullets[x].angle = GetDragAngle()
        		gun.fireTimer = 0.0
        		Resetbullets ( x, 1)
        	endif
        endif
next x
        for x = 0 to gun.Bullets.length
            
            gun.bullets[x].gunbulletx = GetSpriteXByOffset(gun.bullets[x].sprite)   :   gun.bullets[x].gunbullety = GetSpriteYByOffset(gun.bullets[x].sprite)
            SetSpritePositionByOffset(gun.bullets[x].sprite, gun.bullets[x].gunbulletx+SIN(gun.bullets[x].angle)*Rate#, gun.bullets[x].gunbullety-COS(gun.bullets[x].angle)*Rate#)
            If GetSpriteInScreen(gun.bullets[x].sprite) = 0
            	gun.bullets[x].state= 0
                Resetbullets ( x, 0)
            Endif
        next x
    If GetRawKeyState(27) then Exit   
    Sync()
		loop

i know it looks a little sloppy but i didnt want to just copy and paste code im trying to understand it all and experimenting with it but i think im getting a hold on it, again thank you all

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MadBit

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Joined: 25th Jun 2009

Location: Germany

Posted: 1st Dec 2021 04:53

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I would like to suggest a small improvement.
Instead of saving the angle when shooting the bullet, I would immediately calculate the direction.
Since that should not change after shooting.
Unless the bullet had some kind of target tracking

.

so you would not have to do the same sin / cos calculation for each bullet in each frame.
Theoretically you could also multiply the speed (Rate#).
Then this calculation would happen only once.

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Newcomers AppGameKit Corner / [SOLVED] help with bullets moving in the direction player aims (2d game)