The LeftKey() function with return the state of LEFT ARROW key on your keyboard.
Since the Arrows keys are commonly used as game controls, these keys have their own special commands. Purely to make things easier to remember.
If the key is being pressed this function will return a value of 1 (True), however if it's not being pressed, it will return a zero.
FACTS:
* None
Mini Tutorial #1:
This example shows how to read the four arrow keys.
Do
Cls RGB(0,0,0)
; Display the Status of the UP,DOWN LEFT & RIGHT
; Arrow keys
Print "Up Arrow Key State:"+Str$(UpKey())
Print "Right Arrow Key State:"+Str$(RightKey())
Print "Down Arrow Key State:"+Str$(DownKey())
Print "Left Arrow Key State:"+Str$(LeftKey())
; Display the Screen and wait for the user to press a key
Sync
Loop
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Mini Tutorial #2:
This example shows how to use arrow keys to control a character. In this case the character is a "circle", but the same basic logic applies to controlling a sprites or an image.
; Make the Variable XPOS = to the screen width divided by
; two. So it should be in the center of the screen
XPOS = GetScreenWidth()/2
; Make the Variable YPOS = to the screen width divided by
; two. So it should be in the center of the screen
YPOS = GetScreenHeight()/2
; Set the SPEED value to how fast the object should move
Speed=5
Do
; Clear the Screen to BLACK (rgb(0,0,0)
Cls RGB(0,0,0)
; If the User Presses the LEFT arrow, SUB speed
; from the XPOS variable
If LeftKey()=true Then Xpos=Xpos-Speed
; If the User Presses the RIGHTarrow, ADD speed
; to the XPOS variable
If RightKey()=true Then Xpos=Xpos+Speed
; If the User Presses the UP arrow, SUB speed
; from the YPOS variable
If UpKey()=true Then Ypos=Ypos-Speed
; If the User Presses the DOWN arrow, ADD speed
; to the YPOS variable
If DownKey()=true Then Ypos=Ypos+Speed
; Draw a Circle to represent the character your controlling
Circle Xpos,Ypos,25,1
; Display the Screen and loop back to the DO statement
Sync
Loop
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