[BASIC] Stuck on physics - GameCreators Forum

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basicFanatic

6

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Joined: 7th Jun 2017

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Posted: 18th Jun 2017 00:08

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I managed to get some ASDW movement working! However, I can't adjust the speed, and I have the feeling that SetSpritePhysicsVelocity is simply the wrong way to do it. But I have no clue how to use SetSpritePhysicsForce. Can anyone give me some pointers? I really want some solid physics as the foundation, but I'm totally clueless as to how I should go on about it.

My code so far:

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "Fun with chainsaws" )
SetWindowSize( 800, 600, 0 )
SetWindowAllowResize( 0 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 800, 600 ) // doesn't have to match the window
//SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 60, 0 ) // 30fps instead of 60 to save battery
//SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

setphysicsscale(1)
SetPhysicsGravity(0 , 0)

hero = CreateSprite(0)
SetSpriteSize( hero, 30, 51 )
SetSpriteColor( hero, 0, 255, 128, 255 )

SetSpritePhysicsOn( hero, 2)
SetSpritePhysicsDamping( hero, 8.0)
SetSpritePhysicsCanRotate( hero, 0 )

heroSpeed as Float = 300.0

SetSpritePosition (hero, GetVirtualWidth()/2, GetVirtualHeight()/2)

do

//
	//    W
	//  A S D
	//
	// 8 directional navigation here:
	
	
    if GetRawKeyState(65)  // A, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsVelocity( hero, -heroSpeed, -heroSpeed )
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsVelocity( hero, -heroSpeed, heroSpeed )
		else
			SetSpritePhysicsVelocity( hero, -heroSpeed, 0 ) 
		endif
	endif
	
    if GetRawKeyState(68)  // D, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsVelocity( hero, heroSpeed, -heroSpeed )
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsVelocity( hero, heroSpeed, heroSpeed )
		else
			SetSpritePhysicsVelocity( hero, heroSpeed, 0 ) 
		endif
	endif
	
	if GetRawKeyState(87) and not GetRawKeyState(65) and not GetRawKeyState(68) // W (A or D not pressed)
		SetSpritePhysicsVelocity( hero, 0, -heroSpeed ) 
	endif
	
 	if GetRawKeyState(83) and not GetRawKeyState(65) and not GetRawKeyState(68) // S (A or D not pressed)
		SetSpritePhysicsVelocity( hero, 0, heroSpeed ) 
	endif
	
	StepPhysics(1.0/60.0)
    Sync()
loop

+ Code Snippet


// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "Fun with chainsaws" )
SetWindowSize( 800, 600, 0 )
SetWindowAllowResize( 0 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 800, 600 ) // doesn't have to match the window
//SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 60, 0 ) // 30fps instead of 60 to save battery
//SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts


setphysicsscale(1)
SetPhysicsGravity(0 , 0)

hero = CreateSprite(0)
SetSpriteSize( hero, 30, 51 )
SetSpriteColor( hero, 0, 255, 128, 255 ) 

SetSpritePhysicsOn( hero, 2)
SetSpritePhysicsDamping( hero, 8.0)
SetSpritePhysicsCanRotate( hero, 0 ) 

heroSpeed as Float = 300.0

SetSpritePosition (hero, GetVirtualWidth()/2, GetVirtualHeight()/2)


do

	//
	//    W
	//  A S D
	//
	// 8 directional navigation here:
	
	
    if GetRawKeyState(65)  // A, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsVelocity( hero, -heroSpeed, -heroSpeed )
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsVelocity( hero, -heroSpeed, heroSpeed )
		else
			SetSpritePhysicsVelocity( hero, -heroSpeed, 0 ) 
		endif
	endif
	
    if GetRawKeyState(68)  // D, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsVelocity( hero, heroSpeed, -heroSpeed )
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsVelocity( hero, heroSpeed, heroSpeed )
		else
			SetSpritePhysicsVelocity( hero, heroSpeed, 0 ) 
		endif
	endif
	
	if GetRawKeyState(87) and not GetRawKeyState(65) and not GetRawKeyState(68) // W (A or D not pressed)
		SetSpritePhysicsVelocity( hero, 0, -heroSpeed ) 
	endif
	
 	if GetRawKeyState(83) and not GetRawKeyState(65) and not GetRawKeyState(68) // S (A or D not pressed)
		SetSpritePhysicsVelocity( hero, 0, heroSpeed ) 
	endif
	
	StepPhysics(1.0/60.0)
    Sync()
loop

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blink0k

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11

Years of Service

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Joined: 22nd Feb 2013

Location: the land of oz

Posted: 18th Jun 2017 00:29

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I found this example very helpful

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basicFanatic

6

Years of Service

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Joined: 7th Jun 2017

Location:

Posted: 18th Jun 2017 01:01

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That one works pretty good!

However, it't based on SetSpritePhysicsVelocity, which makes sense when creating an instant shooting effect. But I'm more trying to apply a movement force when holding down the ASDW movement keys.

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blink0k

Moderator

11

Years of Service

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Joined: 22nd Feb 2013

Location: the land of oz

Posted: 18th Jun 2017 01:04

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Try setphysicsscale(0.1)

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basicFanatic

6

Years of Service

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Joined: 7th Jun 2017

Location:

Posted: 18th Jun 2017 01:52

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Thanks, that 0.1 did wonders! I even got SetSpritePhysicsForce to work:

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "Green Hero Box" )
SetWindowSize( 800, 600, 0 )
SetWindowAllowResize( 0 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 800, 600 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 60, 0 ) // 30fps instead of 60 to save battery
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

setphysicsscale(0.1)
SetPhysicsGravity(0 , 0)

hero = CreateSprite(0)
SetSpriteSize( hero, 30, 51 )
SetSpriteColor( hero, 0, 255, 128, 255 )

SetSpritePhysicsOn( hero, 2)
SetSpritePhysicsCanRotate( hero, 0 )
SetSpritePhysicsDamping( hero, 7.0)

heroSpeed as Float = 60000.0

SetSpritePosition (hero, GetVirtualWidth()/2, GetVirtualHeight()/2)

do
	//    W
	//  A S D
	//
	// 8 directional navigation here:
	
    if GetRawKeyState(65)  // A, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),-heroSpeed*0.7,-heroSpeed*0.7)
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),-heroSpeed*0.7,heroSpeed*0.7)
		else
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),-heroSpeed, 0)
		endif
	endif
	
    if GetRawKeyState(68)  // D, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),heroSpeed*0.7,-heroSpeed*0.7)
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),heroSpeed*0.7,heroSpeed*0.7)
		else
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),heroSpeed,0)
		endif
	endif
	
	if GetRawKeyState(87) and not GetRawKeyState(65) and not GetRawKeyState(68) // W (A or D not pressed)
		SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),0,-heroSpeed)
	endif
	
 	if GetRawKeyState(83) and not GetRawKeyState(65) and not GetRawKeyState(68) // S (A or D not pressed)
		SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),0,heroSpeed)
	endif

StepPhysics(1.0/60.0)
    Sync()
loop

+ Code Snippet

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "Green Hero Box" )
SetWindowSize( 800, 600, 0 )
SetWindowAllowResize( 0 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 800, 600 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 60, 0 ) // 30fps instead of 60 to save battery
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

setphysicsscale(0.1)
SetPhysicsGravity(0 , 0)

hero = CreateSprite(0)
SetSpriteSize( hero, 30, 51 )
SetSpriteColor( hero, 0, 255, 128, 255 ) 

SetSpritePhysicsOn( hero, 2)
SetSpritePhysicsCanRotate( hero, 0 )
SetSpritePhysicsDamping( hero, 7.0)

heroSpeed as Float = 60000.0

SetSpritePosition (hero, GetVirtualWidth()/2, GetVirtualHeight()/2)

do
	//    W
	//  A S D
	//
	// 8 directional navigation here:
	
    if GetRawKeyState(65)  // A, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),-heroSpeed*0.7,-heroSpeed*0.7)
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),-heroSpeed*0.7,heroSpeed*0.7)
		else
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),-heroSpeed, 0)
		endif
	endif
	
    if GetRawKeyState(68)  // D, possibly in combination with W or S
		if GetRawKeyState(87) // W
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),heroSpeed*0.7,-heroSpeed*0.7)
		elseif GetRawKeyState(83) // S
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),heroSpeed*0.7,heroSpeed*0.7)
		else
			SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),heroSpeed,0)
		endif
	endif
	
	if GetRawKeyState(87) and not GetRawKeyState(65) and not GetRawKeyState(68) // W (A or D not pressed)
		SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),0,-heroSpeed)
	endif
	
 	if GetRawKeyState(83) and not GetRawKeyState(65) and not GetRawKeyState(68) // S (A or D not pressed)
		SetSpritePhysicsForce(hero,GetSpriteXByOffset(hero),GetSpriteYByOffset(hero),0,heroSpeed)
	endif

	StepPhysics(1.0/60.0)
    Sync()
loop

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