TheGameCreators - CodeBase - Get Screen Coordinates From Sprite Coordinates

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Category: Sprite

Version: 1.0

Information

Uploaded: 10th Oct 2011 13:08

Modified: 1st Jan 1970 01:00

Author: Grumpy Jedi

Summary

These two functions allow you to return the screen x and y coordinates underneath a particular spot on a sprite.

Full Description

These two functions allow you to return the screen x and y coordinates underneath a particular spot on a sprite.<br /> <br /> You can use the return values to place sprites at exact locations on other sprites. If you then return the values and update the sprite every loop, you can keep a sprite perfectly placed on another sprite even when it is rotated or resized.<br /> <br /> The functions also take aspect ratio into account so that is not a problem.

AGK Source Code

` This code was downloaded from The Game Creators

` It is reproduced here with full permission

` http://www.thegamecreators.com

function GetScreenXFromSpriteXY(iSpriteIndex, fSpriteX#, fSpriteY#)

`fSpriteX# and fSpriteY# should be passed as a percentage of the distance to the edge of the sprite from the offset point.

`In otherwords if your sprite is rotating around its center (50,50) and you wanted to return the screen location under 0,0

`on the sprite, you would pass (-100, -100) into the function because 0,0 is negative 100 percent of the distance from the

`offset point to the sprite edge in both x and y.

`Note that if your offset point is 0,0 - Passing (100, 100) into the function returns the bottom right corner of the sprite.

`The distance to the edge is relative to the offset point and always totals 100 percent.

`The return value is a float

fSpriteY# = fSpriteY# / GetDisplayAspect()

SpriteX# = GetSpriteXByOffset(iSpriteIndex)

SpriteY# = GetSpriteYByOffset(iSpriteIndex)

SpriteAngle# = GetSpriteAngle(iSpriteIndex)

OffsetAmountX = (GetSpriteXByOffset(iSpriteIndex) - GetSpriteX(iSpriteIndex))

OffsetAmountY = (GetSpriteYByOffset(iSpriteIndex) - GetSpriteY(iSpriteIndex))

DistanceX# = (GetSpriteWidth(iSpriteIndex) - OffsetAmountX) * (fSpriteX# / 100)

DistanceY# = (GetSpriteHeight(iSpriteIndex) - OffsetAmountY) * (fSpriteY# / 100)

angle#= (SpriteAngle# + 90) + ATANFULL(DistanceX#,DistanceY#)

`These are not the droids you're looking for (err ANGLES! I mean ANGLES!)

if angle# + 180 >= 360

angle# = ABS(360 - (angle# + 180))

else

angle# = ABS(angle# + 180)

endif

TheDistance# = sqrt ((DistanceX# * DistanceX#) + (DistanceY# * DistanceY#))

GetCosine# = COS(angle#) * TheDistance#

GetSine# = SIN(angle#) * TheDistance# * GetDisplayAspect()

ScreenX# = SpriteX# + GetCosine#

ScreenY# = SpriteY# + GetSine#

endfunction ScreenX#

function GetScreenYFromSpriteXY(iSpriteIndex, fSpriteX#, fSpriteY#)