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72 lines
3.1 KiB
Plaintext
72 lines
3.1 KiB
Plaintext
{{DISPLAYTITLE:_WHEEL}}
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The [[_WHEEL]] function returns the relative position of a specified wheel number on a controller device.
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{{PageSyntax}}
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: {{Parameter|move}} = [[_WHEEL]]({{Parameter|wheelNumber%}})
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* Returns -1 when scrolling up and 1 when scrolling down with 0 indicating no movement since last read.
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* Add consecutive wheel values to determine a cumulative value over time for scrolling or moving objects.
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* {{Parameter|wheelNumber%}} must be a number which does not exceed the number of wheels found by the [[_LASTWHEEL]] function.
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* When a mouse indicates it has 3 wheels, the first two are for relative movement reads. The third wheel is for scrolling.
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* '''The number of [[_DEVICES]] must be read before using [[_DEVICE$]], [[_DEVICEINPUT]] or [[_LASTWHEEL]].'''
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{{PageExamples}}
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''Example 1:'' Reading multiple controller device buttons, axis and wheels.
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{{CodeStart}} '' ''
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{{Cl|FOR...NEXT|FOR}} i = 1 {{Cl|TO}} {{Cl|_DEVICES}}
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{{Cl|PRINT}} {{Cl|STR$}}(i) + ") " + {{Cl|_DEVICE$}}(i) + " Buttons:"; {{Cl|_LASTBUTTON}}(i); ",Axis:"; {{Cl|_LASTAXIS}}(i); ",Wheel:"; {{Cl|_LASTWHEEL}}(i)
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{{Cl|NEXT}}
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{{Cl|DO...LOOP|DO}}
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d& = {{Cl|_DEVICEINPUT}}
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{{Cl|IF...THEN|IF}} d& {{Cl|THEN}} ' the device number cannot be zero!
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{{Cl|PRINT}} "Found"; d&;
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{{Cl|FOR...NEXT|FOR}} b = 1 {{Cl|TO}} {{Cl|_LASTBUTTON}}(d&)
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{{Cl|PRINT}} {{Cl|_BUTTONCHANGE}}(b); {{Cl|_BUTTON}}(b);
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{{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} a = 1 {{Cl|TO}} {{Cl|_LASTAXIS}}(d&)
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{{Cl|PRINT}} {{Cl|_AXIS}}(a);
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{{Cl|NEXT}}
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{{Cl|FOR...NEXT|FOR}} w = 1 {{Cl|TO}} {{Cl|_LASTWHEEL}}(d&)
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{{Cl|PRINT}} {{Cl|_WHEEL}}(w);
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{{Cl|NEXT}}
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{{Cl|PRINT}}
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{{Cl|END IF}}
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} = {{Cl|CHR$}}(27) 'escape key exit
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{{Cl|END}} '' ''
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{{CodeEnd}}
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: ''Note:'' When there is no device control to read, a [[FOR...NEXT|FOR]] n = 1 TO 0 loop will not run thus avoiding a control function read error.
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''Example 2:'' Why does a mouse have 3 wheels? Relative x and y movements can be read using the first 2 _WHEEL reads.
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{{CodeStart}} '' ''
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ignore = {{Cl|_MOUSEMOVEMENTX}} 'dummy call to put mouse into relative movement mode
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{{Cl|PRINT}} "Move your mouse and/or your mouse wheel (ESC to exit)"
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d = {{Cl|_DEVICES}} ' always read number of devices to enable device input
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DO: {{Cl|_LIMIT}} 30 'main loop
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{{Cl|DO...LOOP|DO}} {{Cl|WHILE}} {{Cl|_DEVICEINPUT}}(2) 'loop only runs during a device 2 mouse event
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{{Cl|PRINT}} {{Cl|_WHEEL}}(1), {{Cl|_WHEEL}}(2), {{Cl|_WHEEL}}(3)
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{{Cl|LOOP}}
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} = {{Cl|CHR$}}(27) '' ''
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{{CodeEnd}}
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: ''Explanation:'' Referencing the [[_MOUSEMOVEMENTX]] function hides the mouse and sets the mouse to a relative movement mode which can be read by [[_WHEEL]]. [[_DEVICEINPUT]](2) returns -1 (true) only when the mouse is moved, scrolled or clicked.
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{{PageSeeAlso}}
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* [[_MOUSEWHEEL]]
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* [[_LASTWHEEL]], [[_LASTBUTTON]], [[_LASTAXIS]]
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* [[_AXIS]], [[_BUTTON]], [[_BUTTONCHANGE]]
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* [[_DEVICES]], [[_DEVICE$]], [[_DEVICEINPUT]]
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* [[_MOUSEMOVEMENTX]], [[_MOUSEMOVEMENTY]]
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* [[Controller Devices]]
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{{PageNavigation}}
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