68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/*******************************************************************
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* Pilot Software
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*
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* Copyright(c) 1994, Palm Computing Inc., All Rights Reserved
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*
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*-------------------------------------------------------------------
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* FileName:
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* PenPrv.h
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*
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* Description:
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* Private Include file for Pen manager
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*
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* History:
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* 6/5/96 Created by Ron Marianetti
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*
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*******************************************************************/
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#ifdef NON_PORTABLE
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#ifndef __PEN_PRV_H
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#define __PEN_PRV_H
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/********************************************************************
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* Pen Manager Constants
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********************************************************************/
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#define penCalibrateTop 10
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#define penCalibrateLeft 10
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#define penCalibrateBottom (hwrDisplayHeight-10)
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#define penCalibrateRight (hwrDisplayWidth-10)
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#define penInitDelay 30
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#define penInitMaxDDZ 12 // max change allowed in dx or dy between
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// 2 samples.
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/********************************************************************
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* Pen Manager Globals
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********************************************************************/
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typedef struct PenGlobalsType {
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UInt xOffset, yOffset;
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UInt xScale, yScale;
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// This variable is incremented every time we detect the pen up,
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// until we've seen it enough times to believe it.
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UInt penRising;
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// We keep this information around in order to throw out invalid
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// points. Invalid points are most likey to occur as the pen is lifted
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// and we filter them by throwing out points that show a drastic
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// change in velocity in either the x or y direction
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Int lastX; // x of last point (-1 if no previous point)
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Int lastY; // y of last point
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Int lastDX; // delta y of previous 2 points
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Int lastDY; // delta x of previous 2 points
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// Parameters for filter
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UInt delay; // delay before reading A/D
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UInt maxDDZ; // max 2nd derivative.
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} PenGlobalsType;
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typedef PenGlobalsType* PenGlobalsPtr;
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#endif //__PEN_MGR_H
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#endif // NON_PORTABLE
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