How to find the top of a sprite using GetSpriteX(..)?

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Subbir

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Posted: 18th Oct 2012 08:46

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I have this sprite attached with this post. I have to rotate this sprite from the bottom as well as increase the size of this sprite randomly. Thats y I have to set the sprite offset at the bottom by using this function

+ Code Snippet

SetSpriteSize(10, GetSpriteWidth(10), distance#)
SetSpriteOffSet(10, 0, GetSpriteHeight(10))
SetSpriteAngle(10, radianArrow#)
SetSpritePositionByOffSet(10, (GetSpriteWidth(5)/2) + GetSpriteX(5)-(GetSpriteWidth(10)/2), GetSpriteY(5))

But the problem is I cant get the top position of this sprite. After rotation I need the top position of this sprite where I could see that on which box its pointing to. But if I try using GetSpriteX() or GetSpriteY() then it shows only the bottom position of this sprite.

Is it possible to get the sprite Top position after setting up the SpriteOffset? Its kindaa killing me. Please help

Subbir Rahman

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Marl

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Location: Bradford, UK

Posted: 18th Oct 2012 10:00

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off the top of my head

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top = GetSpriteY(5) - distance# * sin( radianArrow# + 90 )

The last bit might be -90, sorry away from my code.

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Subbir

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Posted: 18th Oct 2012 10:49 Edited at: 18th Oct 2012 10:57

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I am afraid this is not working. I have tried this method earlier. The problem is If I scroll my pointer to the left side, It doesnt show the right path or co-ordinate. I have attached the screenshoot. Just take a look of it. The Xnew# and Ynew# isnt showing the right co-ordinate on the screen. I am giving u my code how I have done this.

//Directional Arrow
    pointIX# = 127.0 + 34.0
    pointIY# = 358.0 + 18

pointKX# = 127.0 + 34.0
    pointKY# = (GetSpriteHeight(5)/2) + GetSpriteY(5)

pointJX# = (GetSpriteWidth(5)/2) + GetSpriteX(5)
    pointJY# = (GetSpriteHeight(5)/2) + GetSpriteY(5)

otivuj# = sqrt((pointIX#-pointJX#)^2+(pointIY#-pointJY#)^2)
    vumi# = sqrt((pointIX#-pointKX#)^2+(pointIY#-pointKY#)^2)
    lombo# = sqrt((pointKX#-pointJX#)^2+(pointKY#-pointJY#)^2)
    radianArrow# = ACos(vumi#/otivuj#)

angleToThrow# = radianArrow#
    distance# = otivuj#*6

Xnew# = 0.0
    Ynew# = 0.0

if (((GetSpriteWidth(5)/2) + GetSpriteX(5)) <= 127.0+34.0)
        Print("Less")
        radianArrow# = radianArrow# * 1.1
        Xnew# = ((GetSpriteWidth(5)/2) + GetSpriteX(5)) + distance#*(Cos(90-radianArrow#))
        Xnew# = (Xnew#-161.0) + 161.0
        Ynew# = GetSpriteY(5) + distance#*(-Sin(90-radianArrow#))
        direction = 1
    elseif (((GetSpriteWidth(5)/2) + GetSpriteX(5)) > 127.0+34.0)
        Print("Greater")
        radianArrow# = radianArrow# * 1.1
        Xnew# = ((GetSpriteWidth(5)/2) + GetSpriteX(5)) - distance#*(Cos(90+radianArrow#))
        Xnew# = 161.0 - (Xnew#-161.0)
        Ynew# = GetSpriteY(5) + distance#*(-Sin(90+radianArrow#))
        direction = 2
        radianArrow# = -radianArrow#
    endIf

Print("Radian")
    Print(radianArrow#)

SetSpriteSize(10, GetSpriteWidth(10), distance#)
    SetSpriteOffSet(10, 0, GetSpriteHeight(10))
    SetSpriteAngle(10, radianArrow#)
    SetSpritePositionByOffSet(10, (GetSpriteWidth(5)/2) + GetSpriteX(5)-(GetSpriteWidth(10)/2), GetSpriteY(5))

Print("Xnew#")
    Print(Xnew#)
    Print("Ynew#")
    Print(Ynew#)

Print("SpriteX")
    Print(GetSpriteX(10))
    Print("SpriteY")
    Print(GetSpriteY(10))

Print("SpriteHit")
    Print(GetSpriteHit(Xnew#, Ynew#))

if GetSpriteHit(Xnew#, Ynew#)<>unSelect and unSelect <> 0
        SetSpriteImage(unSelect, LoadImage("Box.png"))
    endIf

if GetSpriteHit(Xnew#, Ynew#)>100
        CellSelected = GetSpriteHit(Xnew#, Ynew#)
        if direction = 1
            SetSpriteImage(GetSpriteHit(Xnew#, Ynew#), LoadImage("BoxH.png"))
            unSelect =  GetSpriteHit(Xnew#, Ynew#)
        else direction = 2
            SetSpriteImage(GetSpriteHit(Xnew#, Ynew#), LoadImage("BoxH.png"))
            unSelect =  GetSpriteHit(Xnew#, Ynew#)
        EndIf
    EndIf

+ Code Snippet

//Directional Arrow
    pointIX# = 127.0 + 34.0
    pointIY# = 358.0 + 18

    pointKX# = 127.0 + 34.0
    pointKY# = (GetSpriteHeight(5)/2) + GetSpriteY(5)

    pointJX# = (GetSpriteWidth(5)/2) + GetSpriteX(5)
    pointJY# = (GetSpriteHeight(5)/2) + GetSpriteY(5)

    otivuj# = sqrt((pointIX#-pointJX#)^2+(pointIY#-pointJY#)^2)
    vumi# = sqrt((pointIX#-pointKX#)^2+(pointIY#-pointKY#)^2)
    lombo# = sqrt((pointKX#-pointJX#)^2+(pointKY#-pointJY#)^2)
    radianArrow# = ACos(vumi#/otivuj#)

    angleToThrow# = radianArrow#
    distance# = otivuj#*6

    Xnew# = 0.0
    Ynew# = 0.0

    if (((GetSpriteWidth(5)/2) + GetSpriteX(5)) <= 127.0+34.0)
        Print("Less")
        radianArrow# = radianArrow# * 1.1
        Xnew# = ((GetSpriteWidth(5)/2) + GetSpriteX(5)) + distance#*(Cos(90-radianArrow#))
        Xnew# = (Xnew#-161.0) + 161.0
        Ynew# = GetSpriteY(5) + distance#*(-Sin(90-radianArrow#))
        direction = 1
    elseif (((GetSpriteWidth(5)/2) + GetSpriteX(5)) > 127.0+34.0)
        Print("Greater")
        radianArrow# = radianArrow# * 1.1
        Xnew# = ((GetSpriteWidth(5)/2) + GetSpriteX(5)) - distance#*(Cos(90+radianArrow#))
        Xnew# = 161.0 - (Xnew#-161.0)
        Ynew# = GetSpriteY(5) + distance#*(-Sin(90+radianArrow#))
        direction = 2
        radianArrow# = -radianArrow#
    endIf

    Print("Radian")
    Print(radianArrow#)

    SetSpriteSize(10, GetSpriteWidth(10), distance#)
    SetSpriteOffSet(10, 0, GetSpriteHeight(10))
    SetSpriteAngle(10, radianArrow#)
    SetSpritePositionByOffSet(10, (GetSpriteWidth(5)/2) + GetSpriteX(5)-(GetSpriteWidth(10)/2), GetSpriteY(5))

    Print("Xnew#")
    Print(Xnew#)
    Print("Ynew#")
    Print(Ynew#)

    Print("SpriteX")
    Print(GetSpriteX(10))
    Print("SpriteY")
    Print(GetSpriteY(10))

    Print("SpriteHit")
    Print(GetSpriteHit(Xnew#, Ynew#))

    if GetSpriteHit(Xnew#, Ynew#)<>unSelect and unSelect <> 0
        SetSpriteImage(unSelect, LoadImage("Box.png"))
    endIf

    if GetSpriteHit(Xnew#, Ynew#)>100
        CellSelected = GetSpriteHit(Xnew#, Ynew#)
        if direction = 1
            SetSpriteImage(GetSpriteHit(Xnew#, Ynew#), LoadImage("BoxH.png"))
            unSelect =  GetSpriteHit(Xnew#, Ynew#)
        else direction = 2
            SetSpriteImage(GetSpriteHit(Xnew#, Ynew#), LoadImage("BoxH.png"))
            unSelect =  GetSpriteHit(Xnew#, Ynew#)
        EndIf
    EndIf

Subbir Rahman

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Marl

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Joined: 19th Nov 2011

Location: Bradford, UK

Posted: 18th Oct 2012 20:28 Edited at: 18th Oct 2012 20:30

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Have a look at this, it shows the method I would use.

I've used very obvious variable names to try to keep the method as clear as possible.

#constant MIN_ANGLE		-45.0
#constant MAX_ANGLE		45.0

setVirtualResolution( getDeviceWidth() , getDeviceHeight() )
thisWidth = getVirtualWidth()
thisHeight = getVirtualHeight()
setPrintSize( thisWidth / 20 )

spriteHeight# = thisHeight * 0.25
spriteWidth# = 8.0
powerSprite = createSprite( 0 )

spriteX = thisWidth / 2.0
spriteY = thisHeight - 10.0

spriteAngleOffset# = 0.0

minHeight = thisWidth * 0.1
maxHeight = thisHeight

frameCount = 0
frameStep = 1			` Number of frames step between each update ( min 1 )

do
	inc frameCount , 1

if mod( frameCount , frameStep + 1 ) = 0
		frameTime# = getFrameTime() * frameStep

// Calculate movement speeds
		sizeSpeed# = frameTime# * thisWidth
		angleSpeed# = frameTime# * 180.0

// change angle by random amount
		spriteAngleOffset# = spriteAngleOffset# + random( -1 , 1 ) * angleSpeed#
		// Check against limits
		if spriteAngleOffset# < MIN_ANGLE
			spriteAngleOffset# = MIN_ANGLE
		elseif spriteAngleOffset# > MAX_ANGLE
			spriteAngleOffset# = MAX_ANGLE
		endif
		// Change size by random amount
		spriteHeight# = spriteHeight# + random( -1 , 1 ) * sizeSpeed#
		// Check against limits
		if spriteHeight# < minHeight
			spriteHeight# = minHeight
		elseif spriteHeight# > maxHeight
			spriteHeight# = maxHeight
		endif
		// Adjust sprite
		setSpriteSize( powerSprite , spriteWidth# , spriteHeight# )
		setSpriteOffset( powerSprite , spriteWidth# * 0.5 , spriteHeight# )
		setSpritePositionByOffset( powerSprite , spriteX , spriteY )
		setSpriteAngle( powerSprite  , spriteAngleOffset# )
		// Calculate position of tip
		spriteTipX = spriteX + spriteHeight# * cos( 90 + spriteAngleOffset# )
		spriteTipY = spriteY - spriteHeight# * sin( 90 + spriteAngleOffset# )
	endif

print( " Screen: " + str( thisWidth ) + " , " + str( thisHeight ))
	print( "Pointer: " + str( getPointerX() , 0 ) + " , " + str( getPointerY() , 0 ))
	print( "   Base: " + str( spriteX ) + " , " + str( spriteY ) )
	print( "    Tip: " + str( spriteTipX ) + " , " + str( spriteTipY ) )

Sync()
loop

end

+ Code Snippet

#constant MIN_ANGLE		-45.0
#constant MAX_ANGLE		45.0

setVirtualResolution( getDeviceWidth() , getDeviceHeight() )
thisWidth = getVirtualWidth()
thisHeight = getVirtualHeight()
setPrintSize( thisWidth / 20 )

spriteHeight# = thisHeight * 0.25
spriteWidth# = 8.0
powerSprite = createSprite( 0 )

spriteX = thisWidth / 2.0
spriteY = thisHeight - 10.0

spriteAngleOffset# = 0.0

minHeight = thisWidth * 0.1
maxHeight = thisHeight

frameCount = 0
frameStep = 1			` Number of frames step between each update ( min 1 )

do
	inc frameCount , 1

	if mod( frameCount , frameStep + 1 ) = 0
		frameTime# = getFrameTime() * frameStep

		// Calculate movement speeds
		sizeSpeed# = frameTime# * thisWidth
		angleSpeed# = frameTime# * 180.0

		// change angle by random amount
		spriteAngleOffset# = spriteAngleOffset# + random( -1 , 1 ) * angleSpeed#
		// Check against limits
		if spriteAngleOffset# < MIN_ANGLE
			spriteAngleOffset# = MIN_ANGLE
		elseif spriteAngleOffset# > MAX_ANGLE
			spriteAngleOffset# = MAX_ANGLE
		endif
		// Change size by random amount
		spriteHeight# = spriteHeight# + random( -1 , 1 ) * sizeSpeed#
		// Check against limits
		if spriteHeight# < minHeight
			spriteHeight# = minHeight
		elseif spriteHeight# > maxHeight
			spriteHeight# = maxHeight
		endif
		// Adjust sprite
		setSpriteSize( powerSprite , spriteWidth# , spriteHeight# )
		setSpriteOffset( powerSprite , spriteWidth# * 0.5 , spriteHeight# )
		setSpritePositionByOffset( powerSprite , spriteX , spriteY )
		setSpriteAngle( powerSprite  , spriteAngleOffset# )
		// Calculate position of tip
		spriteTipX = spriteX + spriteHeight# * cos( 90 + spriteAngleOffset# )
		spriteTipY = spriteY - spriteHeight# * sin( 90 + spriteAngleOffset# )
	endif

	print( " Screen: " + str( thisWidth ) + " , " + str( thisHeight ))
	print( "Pointer: " + str( getPointerX() , 0 ) + " , " + str( getPointerY() , 0 ))
	print( "   Base: " + str( spriteX ) + " , " + str( spriteY ) )
	print( "    Tip: " + str( spriteTipX ) + " , " + str( spriteTipY ) )

	Sync()
loop

end

No Media needed.

It changes angle and size a random amount and displays the values to as well as the pointer position ( so the values can be checked )

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Subbir

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Posted: 19th Oct 2012 08:58

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Thank u so much Marl. This is what I was looking for...