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2D All the way! / Sprite Rotate

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Bozzy

Years of Service

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Joined: 10th Sep 2006

Location: Birmingham, UK

Posted: 19th Oct 2006 20:24

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Hi, ive got this code:

+ Code Snippet

 plrmove:
if upkey() then move sprite 1,1
if downkey() then move sprite 1,-1
if leftkey() then rotate sprite 1,2
if rightkey() then rotate sprite 1,-2
return

but the sprite only rotates by 2 and then when i keep on holding down left it stays the same angle (which is the original -2) can anyone help?

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Grog Grueslayer

Valued Member

Years of Service

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Joined: 30th May 2005

Playing: Green Hell

Posted: 19th Oct 2006 21:36

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"Rotate sprite" uses a number between 0 and 359. All you need is a variable to store the sprites current rotation. You can use numbers beyond that range and it automatically figures out what the angle is... but it's probably best to limit the range in code.

+ Code Snippet

` Create the sprite
a$="Rotate Sprite"
text 0,0,a$
get image 1,0,0,text width(a$),text height(a$),1
sprite 1,320,240,1
` Offset the sprite so it rotates in the center
offset sprite 1,text width(a$)/2,text height(a$)/2

` SpriteAngle is a number between 0 and 359
SpriteAngle=0

do

 if upkey() then move sprite 1,1
 if downkey() then move sprite 1,-1

 ` Add one to SpriteAngle and rotate sprite
 if leftkey()
  inc SpriteAngle,1
  if SpriteAngle>359 then SpriteAngle=0
  rotate sprite 1,SpriteAngle
 endif

 ` Subtract one from SpriteAngle and rotate sprite
 if rightkey()
  dec SpriteAngle,1
  if SpriteAngle<0 then SpriteAngle=359
  rotate sprite 1,SpriteAngle
 endif
 text 0,0,str$(SpriteAngle)

loop

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2D All the way! / Sprite Rotate