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ofxAccelerometer.h
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ofxAccelerometer.h
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/***********************************************************************
Copyright (c) 2008, 2009, Memo Akten, www.memo.tv
*** The Mega Super Awesome Visuals Company ***
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of MSA Visuals nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ***********************************************************************/
#pragma once
#include "ofTypes.h"
#include "ofPoint.h"
#include "ofEvents.h"
typedef void (*ofxAccelCB)(ofPoint&); // typedef for accelerometer callback
class ofxAccelerometerHandler {
public:
ofxAccelerometerHandler() {
callback = NULL;
setForceSmoothing(0.1f); // little bit of smoothing for force
setOrientationSmoothing(0.9f); // lots of smoothing for orientation / matrix
}
// call this to set it all up
void setup();
// call this when you no longer need the accelerometer
void exit();
// returns current smoothed accelerometer data (value in number of g's (1g = gravity, 9.8m/s^2)
ofPoint &getForce() {
return accelForce;
}
// returns current real accelerometer data (value in number of g's (1g = gravity, 9.8m/s^2)
ofPoint &getRawAcceleration() {
return accelReal;
}
// returns current orientation in degrees (x: pitch, y: roll, z: not used)
ofPoint &getOrientation() {
updateOrientation();
return orientation;
}
GLfloat* getMatrix() {
updateMatrix();
return (GLfloat*)matrix;
}
// set amount of smoothing on data (0: no smooth, 1:very smooth)
void setForceSmoothing(float forceSmoothing) {
this->forceSmoothing = forceSmoothing;
}
void setOrientationSmoothing(float orientationSmoothing) {
this->orientationSmoothing = orientationSmoothing;
}
// if you have a callback which conforms to ofxAccelCB, pass it to this to have it called when motion is detected
void setCallback(ofxAccelCB new_callback) {
callback = new_callback;
}
// platform specific accelerometer engine should call this when motion is detected
void update(float x, float y, float z) {
orientDirty = matrixDirty = true;
accelReal.set(x, y, z);
if(forceSmoothing) {
float lerpFactor = 1 - forceSmoothing;
if(lerpFactor>1) lerpFactor = 1;
else if(lerpFactor < 0.01) lerpFactor = 0.01;
accelForce += (accelReal - accelForce) * lerpFactor;
} else {
accelForce.set(x, y, z);
}
if(orientationSmoothing) {
float lerpFactor = 1 - orientationSmoothing;
if(lerpFactor>1) lerpFactor = 1;
else if(lerpFactor < 0.01) lerpFactor = 0.01;
accelOrientation += (accelReal - accelOrientation) * lerpFactor;
} else {
accelOrientation.set(x, y, z);
}
if(callback) callback(accelReal);
ofNotifyEvent(accelChanged,accelReal,this);
}
ofEvent<ofPoint> accelChanged;
protected:
ofxAccelCB callback;
float forceSmoothing; // amount to smooth incoming data by
float orientationSmoothing; // amount to smooth orientation by
// ofPoint restAccel; // rest acceleration (for calibration)
ofPoint accelReal; // current acceleration
ofPoint accelForce; // smoothed for force
ofPoint accelOrientation; // smoothed for acceleration
ofPoint orientation; // current orientation
bool orientDirty;
GLfloat matrix[4][4]; // contains orientation matrix
bool matrixDirty;
void updateOrientation() {
if(!orientDirty) return;
orientDirty = false;
orientation.x = atan2(accelOrientation.y, -accelOrientation.z) * RAD_TO_DEG;
orientation.y = atan2(accelOrientation.x, -accelOrientation.z) * RAD_TO_DEG;
orientation.z = 0;
}
void updateMatrix() {
if(!matrixDirty) return;
matrixDirty = false;
float length;
//Make sure we have a big enough acceleration vector
length = sqrtf(accelOrientation.x * accelOrientation.x + accelOrientation.y * accelOrientation.y + accelOrientation.z * accelOrientation.z);
if(length < 0.1) return;
//Clear matrix to be used to rotate from the current referential to one based on the gravity vector
bzero(matrix, sizeof(matrix));
matrix[3][3] = 1.0;
//Setup first matrix column as gravity vector
matrix[0][0] = accelOrientation.x / length;
matrix[0][1] = accelOrientation.y / length;
matrix[0][2] = accelOrientation.z / length;
//Setup second matrix column as an arbitrary vector in the plane perpendicular to the gravity vector {Gx, Gy, Gz} defined by by the equation "Gx * x + Gy * y + Gz * z = 0" in which we arbitrarily set x=0 and y=1
matrix[1][0] = 0.0;
matrix[1][1] = 1.0;
matrix[1][2] = -accelOrientation.y / accelOrientation.z;
length = sqrtf(matrix[1][0] * matrix[1][0] + matrix[1][1] * matrix[1][1] + matrix[1][2] * matrix[1][2]);
matrix[1][0] /= length;
matrix[1][1] /= length;
matrix[1][2] /= length;
//Setup third matrix column as the cross product of the first two
matrix[2][0] = matrix[0][1] * matrix[1][2] - matrix[0][2] * matrix[1][1];
matrix[2][1] = matrix[1][0] * matrix[0][2] - matrix[1][2] * matrix[0][0];
matrix[2][2] = matrix[0][0] * matrix[1][1] - matrix[0][1] * matrix[1][0];
}
};
extern ofxAccelerometerHandler ofxAccelerometer;
template<class T>
void ofxRegisterAccelEvents(T * listener){
ofAddListener(ofxAccelerometer.accelChanged,listener,&T::accelerationChanged);
}