Difference between revisions of "Bitwise Operators"
From GiderosMobile
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'''Available since:''' Gideros 2017.10<br/> | '''Available since:''' Gideros 2017.10<br/> | ||
=== Description === | === Description === | ||
| − | <br /> | + | <translate><br /> |
Bitwise operators to manipulate numbers.<br /><br /> | Bitwise operators to manipulate numbers.<br /><br /> | ||
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a<b> << </b>b   Bitwise shift 'a' by 'b' left.<br /> | a<b> << </b>b   Bitwise shift 'a' by 'b' left.<br /> | ||
a<b> >> </b>b   Bitwise shift 'a' by 'b' right.<br /> | a<b> >> </b>b   Bitwise shift 'a' by 'b' right.<br /> | ||
| − | <b> ~ </b>a   Bitwise 'NOT a'.<br /> | + | <b> ~ </b>a   Bitwise 'NOT a'.<br /></translate> |
=== Examples === | === Examples === | ||
'''Set joypad switches'''<br/> | '''Set joypad switches'''<br/> | ||
| − | <source lang="lua" | + | <source lang="lua"> |
if k==KeyCode.UP then joypad=joypad|0b001000 | if k==KeyCode.UP then joypad=joypad|0b001000 | ||
elseif k==KeyCode.DOWN then joypad=joypad|0b000100 | elseif k==KeyCode.DOWN then joypad=joypad|0b000100 | ||
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end</source> | end</source> | ||
'''Clear joypad switches'''<br/> | '''Clear joypad switches'''<br/> | ||
| − | <source lang="lua" | + | <source lang="lua"> |
if k==KeyCode.UP then joypad=joypad&0b0111 | if k==KeyCode.UP then joypad=joypad&0b0111 | ||
elseif k==KeyCode.DOWN then joypad=joypadRGUDLR&0b1011 | elseif k==KeyCode.DOWN then joypad=joypadRGUDLR&0b1011 | ||
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end</source> | end</source> | ||
'''Move in a direction based on joystick switches (using above examples)'''<br/> | '''Move in a direction based on joystick switches (using above examples)'''<br/> | ||
| − | <source lang="lua" | + | <source lang="lua"> |
local deltaX={0,-1,1,0,0,-1,1,0,0,-1,1,0,0,-1,1,0} | local deltaX={0,-1,1,0,0,-1,1,0,0,-1,1,0,0,-1,1,0} | ||
local deltaY={0,0,0,0,1,1,1,1,-1,-1,-1,-1,0,0,0,0} | local deltaY={0,0,0,0,1,1,1,1,-1,-1,-1,-1,0,0,0,0} | ||
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y=y+deltaY[joypad+1]</source> | y=y+deltaY[joypad+1]</source> | ||
'''Debounce bits, eg joypad switches'''<br/> | '''Debounce bits, eg joypad switches'''<br/> | ||
| − | <source lang="lua" | + | <source lang="lua"> |
joypad=(joypad~joypadOld)&joypad | joypad=(joypad~joypadOld)&joypad | ||
joypadOld=joypad</source> | joypadOld=joypad</source> | ||
Revision as of 14:34, 23 August 2018
Supported platforms: android, ios, mac, pc
Available since: Gideros 2017.10
Description
Bitwise operators to manipulate numbers.
a | b Bitwise 'a OR b'.
a & b Bitwise 'a AND b'.
a ~ b Bitwise 'a XOR b'.
a << b Bitwise shift 'a' by 'b' left.
a >> b Bitwise shift 'a' by 'b' right.
~ a Bitwise 'NOT a'.
Examples
Set joypad switches
if k==KeyCode.UP then joypad=joypad|0b001000
elseif k==KeyCode.DOWN then joypad=joypad|0b000100
elseif k==KeyCode.LEFT then joypad=joypad|0b000010
elseif k==KeyCode.RIGHT then joypad=joypad|0b000001
end
Clear joypad switches
if k==KeyCode.UP then joypad=joypad&0b0111
elseif k==KeyCode.DOWN then joypad=joypadRGUDLR&0b1011
elseif k==KeyCode.LEFT then joypad=joypadRGUDLR&0b1101
elseif k==KeyCode.RIGHT then joypad=joypadRGUDLR&0b1110
end
Move in a direction based on joystick switches (using above examples)
local deltaX={0,-1,1,0,0,-1,1,0,0,-1,1,0,0,-1,1,0}
local deltaY={0,0,0,0,1,1,1,1,-1,-1,-1,-1,0,0,0,0}
x=x+deltaX[joypad+1]
y=y+deltaY[joypad+1]
Debounce bits, eg joypad switches
joypad=(joypad~joypadOld)&joypad
joypadOld=joypad
Methods |
EventsConstants |
