glsutil.h

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/*! \file
  \brief  GL Studio helper functions.

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<br>
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*/
#ifndef __GLSUTIL_H
#define __GLSUTIL_H

#include "display.h"

namespace disti
{

/** Returns the minimum angular distance 
  *    between angle1 and angle2.
  */
GLS_EXPORT float AngularDistance(float angle1, float angle2);

/** Returns the absolute value of the minimum angular distance 
  *    between angle1 and angle2.
  */
GLS_EXPORT float AngularDistanceAbs(float angle1, float angle2);

/** Decomposes an integer into individual digits.
  * Returns the individual digits making up the supplied integer
  * \param source The number to break up
  * \param _1 The pointer to the integer to contain the Least Significant Digit (rightmost digit).
  * \param _2 (optional) The pointer to the integer to containing the second digit from the right.
  * \param _3 (optional) The pointer to the integer to containing the third digit from the right.
  * \param _4 (optional) The pointer to the integer to containing the fourth digit from the right.
  * \param _5 (optional) The pointer to the integer to containing the fifth digit from the right.
  * \param _6 (optional) The pointer to the integer to containing the sixth digit from the right.
  * \param _7 (optional) The pointer to the integer to containing the seventh digit from the right.
  * \param _8 (optional) The pointer to the integer to containing the eigth digit from the right.
  */
GLS_EXPORT void GetDigits(int source, 
               int *_1, //least significant digit
               int *_2 = NULL, 
               int *_3 = NULL, 
               int *_4 = NULL, 
               int *_5 = NULL, 
               int *_6 = NULL, 
               int *_7 = NULL,
               int *_8 = NULL);


/** \brief Rotates a needle on a non-linear scale
  * Rotates a needle object to the degree amount determined by
  * the given value relative to the minimum and maximum values.
  * Use multiple segments to map a gauge with a non-linear readout.
  *    
  * \param obj The display object that will move (usually the needle)
  * \param value The actual value that the needle should point to.
  * \param gauge_values A 2 dimensional array that contains the values
  *     and the angles that correspond to the gauge. The
  *     first of the pair is the gauge value.  The second
  *     of the pair is the angle the needle should be
  *     rotated in order to point to it.
  *     The first pair should be the minimal angle the
  *     needle will be rotated while the last pair should
  *     be the maximum angle the needle will be rotated.
  * \param segments The number of pairs in the gauge_values array.
  * \sa Uses Interpolate() internally.
  */
GLS_EXPORT void ChangeNeedle(DisplayObject *obj, const float value, float gauge_values[][2], const int segments);

// Clamp a value to the given range
#define CLAMP_VALUE(val,min,max) ((val) < (min) ? (min) : ((val) > (max) ? (max) : (val)))

/** The ramp functions can be used to generate 
  * varying data for testing purposes.
  * \param time The system time (Available from the Calculate method)
  * \param min The smallest value to return
  * \param max The largest value to return
  * \returns A value varying from min to max.
  */
GLS_EXPORT int RampInt(double time,int min,int max);

/** RampBool can be used to generate 
  * varying data for testing purposes.
  * \param time The system time (Available from the Calculate method)
  * \returns A value varying from false to true
  */
GLS_EXPORT bool RampBool(double time);

/** RampFloat is used to generate 
  * varying data for testing purposes.
  * \param time The system time (Available from the Calculate method)
  * \param min The smallest value to return
  * \param max The largest value to return
  * \returns A value varying from min to max.
  */
GLS_EXPORT float RampFloat(double time,float min,float max);

/** RampDouble is used to generate 
  * varying data for testing purposes.
  * \param time The system time (Available from the Calculate method)
  * \param min The smallest value to return
  * \param max The largest value to return
  * \returns A value varying from min to max.
  */
GLS_EXPORT double RampDouble(double time,double min,double max);

/** \brief Interpolates based on the specified array.
  *
  * Returns an iterpolated value determined by
  * the given value relative to the set of specified 
  * values.
  * Use multiple segments to map a gauge with a non-linear readout.
  * \param value The value to be converted.
  * \param gauge_values A 2 dimensional array that contains the values
  *  and the angles that correspond to the gauge. The
  *  first of the pair is the gauge value.  The second
  *  of the pair is the angle the needle should be
  *  rotated in order to point to it.
  *  The first pair should be the minimal value while the last pair should
  *  be the maximum value.
  *  \param segments The number of pairs in the gauge_values array.
  *  \return the interpolated value.
  *  \sa Used by ChangeNeedle()
  */
GLS_EXPORT float Interpolate(const float value, float gauge_values[][2], const int segments);

/** \brief Moves an object horizontally based on the given values.
  * Moves a digit strip horizontally to the location determined by
  * the given value relative to the minimum and maximum values.
  * 
  * \param obj - The display object to move (usually a horizontal strip of digits.
  * \param value - The value to be displayed on the digit strip.
  * \param min - The smallest value that will be displayed
  * \param max - The largest value that will be displayed.
  * \param refPt -    The location (x) of the object this object is attached to
  * \param locAtMin - The location (x-coord) of the digit strip when placed so that the min value is displayed.
  * \param locAtMax - The location (x-coord) of the digit strip when placed so that the max value is displayed.
  */
GLS_EXPORT void ChangeHStrip(DisplayObject *obj, float value, const float min, const float max, 
                  float refPt,const float locAtMin, const float locAtMax);

/** \brief Moves an object vertically based on the given values.
  * Moves a digit strip vertically to the location determined by
  * the given value relative to the minimum and maximum values.
  *
  * \param obj - The display object to move (usually a horizontal strip of digits.
  * \param value - The value to be displayed on the digit strip.
  * \param min - The smallest value that will be displayed
  * \param max - The largest value that will be displayed.
  * \param refPt -    The location (y) of the object this object is attached to
  * \param locAtMin - The location (y-coord) of the digit strip when placed so that the min value is displayed.
  * \param locAtMax - The location (y-coord) of the digit strip when placed so that the max value is displayed.
  */
GLS_EXPORT void ChangeVStrip(DisplayObject *obj, float value, const float min, const float max, 
                  const float refPt,const float locAtMin, const float locAtMax);


/**  Move a texture within an object to make the object appear to be moving in a Horizontal direction.
  *  Useful for instruments with moving digits.
  *  Assumptions:
  *    The Texture cannot be rotated,
  *    The object cannot be flipped, or reversed
  *    Min value is on the left side of the texture
  *    Max value is on the right side of the texture
  *    The Texture height and width must be powers of 2!
  *
  *  \param obj - The object with the texture to move.
  *  \param unit_movement - How far to move the texture per unit on the scale, e.g., .007227
  *        This is specific to the texture.
  *        unit_movement = ((pixel count of largest unit) - (pixel count of smallest unit)) divided by
  *                         (the pixel width of the image) divided by
  *                         (number of units between the smallest and largest, e.g., 100 MPH)
  *                     this then yeilds (pixel ratio) per unit
  *  \param min_units - The smallest unit displayed, e.g., 0 MPH
  *  \param max_units - The largest unit displayed,  e.g., 100 MPH
  *  \param units - How many units to move the Scale, e.g. 33 MPH
  *  \param starting_x - The starting x position of the texture
  *     The following code can be used to save the starting position:
  *         Vertex *texture = obj->GetTextureCoordinates()[0].x;
  *         starting_x = texture[0].x;
  */
GLS_EXPORT void ChangeHTexture
(
    DisplayObject *obj,        // The object with the texture to move
    const float unit_movement, // How far to move the texture per unit on the scale, e.g., .007227
    const float min_units,     // The smallest unit displayed, e.g., 0 MPH
    const float max_units,     // The largest unit displayed,  e.g., 100 MPH
    float units,               // How many units to move the Scale, e.g. 33 MPH
    const float starting_x     // The starting x position of the texture
);

/** \brief Move a texture within an object to make the object appear to be moving in a Vertical direction.
  *  Useful for instruments with moving digits.
  *  Assumptions:
  *    The Texture cannot be rotated,
  *    The object cannot be flipped, or reversed
  *    Min value is on the bottom side of the texture
  *    Max value is on the top side of the texture
  *    The Texture height and width must be powers of 2!
  *
  *  \param obj - The object with the texture to move.
  *  \param unit_movement - How far to move the texture per unit on the scale, e.g., .007227
  *        This is specific to the texture.
  *        unit_movement = ((pixel count of largest unit) - (pixel count of smallest unit)) divided by
  *                         (the pixel width of the image) divided by
  *                         (number of units between the smallest and largest, e.g., 100 MPH)
  *                     this then yeilds (pixel ratio) per unit
  *  \param min_units - The smallest unit displayed, e.g., 0 MPH
  *  \param max_units - The largest unit displayed,  e.g., 100 MPH
  *  \param units - How many units to move the Scale, e.g. 33 MPH
  *  \param starting_y - The starting x position of the texture
  *     The following code can be used to save the starting position:
  *         Vertex *texture = obj->GetTextureCoordinates()[0].y;
  *         starting_y = texture[0].y;
  */
GLS_EXPORT void ChangeVTexture
(
    DisplayObject *obj,        // The object with the texture to move
    const float unit_movement, // How far to move the texture per unit on the scale, e.g., .007227
    const float min_units,     // The smallest unit displayed, e.g., 0 MPH
    const float max_units,     // The largest unit displayed,  e.g., 100 MPH
    float units,               // How many units to move the Scale, e.g. 33 MPH
    const float starting_y     // The starting Y ratio of the texture
);

GLS_EXPORT void ChangeVTexture
(
    DisplayObject *obj,        // The object with the texture to move
    const float unit_movement, // How far to move the texture per unit on the scale, e.g., .007227
    const float min_units,     // The smallest unit displayed, e.g., 0 MPH
    const float max_units,     // The largest unit displayed,  e.g., 100 MPH
    float units,               // How many units to move the Scale, e.g. 33 MPH
    const float *starting_y    // array of starting Ys ratio of the texture (4 elements)
);

//! Enumeration for Input Operators
typedef enum
{
  INPUT_VERTICAL   = 1,
  INPUT_HORIZONTAL = 2
} InputOrientationEnum;

//! Enumeration for Input Operators
typedef enum
{
  INPUT_FLAG_NORMAL     = 0,
  INPUT_FLAG_SNAPBACK   = 1,
  INPUT_FLAG_WRAPAROUND = 2
} InputPositionEnum;

/**    Uses event data to calculate a new switch position based on the DCS of the object.
  * This is not intended to be called directly.
  */
GLS_EXPORT int CalcSwitchPosDCS(DisplayObject *self, DisplayEvent *ev, 
                  InputOrientationEnum inputType, int numPositions, 
                  float scale = 1.0f);

} // namespace disti

#endif