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/*
08/15/01 awi wrote it
08/16/01 awi changed the last word of synopsis string to "trackballs".
*/
#include "StdAfx.h"
char useGetBall[] = "[deltaX, deltaY] = JOYSTICK(joystickNumber,'GetBall',ballNumber)";
char synopsisGetBall[] = "Given a joystick number and an trackball number, return the change in the trackball "
"X and Y positions since the previous call to 'GetBall'.\n"
"Use 'GetNumJoysticks' and 'GetNumBalls' to determine maximum legal values for joystickNumber and "
"buttonNumber arguments to 'GetBall'. The first joystick and the first ball are numbered 1. "
"It is an error to call 'GetBall' if the specified joystick has no trackballs.";
void JOYSTICKGetBall(int nlhs, mxArray *plhs[], int nrhs, CONSTmxArray *prhs[])
{
ProjectTable *joystickTable=GetProjectTable();
int numSticks, numBalls, fetchedBall, ballX, ballY;
CONSTmxArray *numArg;
double stickNum;
SDL_Joystick *pStick;
if(joystickTable->giveHelp){GiveHelp(useGetBall,synopsisGetBall);return;}
numArg = joystickTable->joystickNumberArgument;
if(numArg == NULL || nlhs > 2 || nrhs > 1 || nrhs < 1 || !mxIsDouble(numArg) || (mxGetM(numArg) * mxGetN(numArg)) != 1 ||
!mxIsDouble(prhs[0]) || (mxGetM(prhs[0]) * mxGetN(prhs[0]) != 1)){
GiveUsageExit(useGetBall);
}
numSticks = SDL_NumJoysticks();
stickNum = mxGetPr(numArg)[0];
if(stickNum > numSticks)
PrintfExit("The joystick number %d passed to JOYSTICK 'GetBall' exceeds the number of joysticks, %d",stickNum,numSticks);
if(stickNum < 1)
PrintfExit("The joystick number passed to JOYSTICK 'GetBall' must be greater than 0");
pStick = GetJoystickObjFromNum((int)stickNum-1);
if(pStick == NULL)
PrintfExit("JOYSTICK 'GetBall' can not open joystick number %d",stickNum);
numBalls = SDL_JoystickNumBalls(pStick);
fetchedBall = (int)mxGetPr(prhs[0])[0];
if(fetchedBall > numBalls || fetchedBall < 0)
PrintfExit("The ball number %d passed to JOYSTICK 'GetBall' is oustide the allowable range",fetchedBall);
SDL_JoystickUpdate();
SDL_JoystickGetBall(pStick, fetchedBall-1, &ballX, &ballY);
switch(nlhs){
case 2:
plhs[1] = mxCreateDoubleMatrix(1,1,mxREAL);
mxGetPr(plhs[1])[0] = (double)ballY;
case 1:
plhs[0] = mxCreateDoubleMatrix(1,1,mxREAL);
mxGetPr(plhs[0])[0] = (double)ballX;
}
}
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