Navigation and Collision Detection for Web-Based 3D Experiment - Interactive Web-Based Virtual Reality with Java 3D - page 364

else if (buttonvalue.indexOf(“Up”) != -1)

{

if (viewposi.y<1.7f)

{

viewposi.y = viewposi.y+SPAN/2.0f;

setPosition(viewTrans, viewposi);

setPosition(bodyTrans, viewposi);

}

}

else if (buttonvalue.indexOf(“Down”) != -1)

{

if (viewposi.y>1.0f)

{

viewposi.y = viewposi.y-SPAN/2.0f;

setPosition(viewTrans, viewposi);

setPosition(bodyTrans, viewposi);

}

}
else if (buttonvalue.indexOf(“Shiftleft”) != -1)
{
direction = SHIFTLEFT;
viewposi.x = viewposi.x-SPAN*(float)Math.sin(turningAngle+Math.PI/2.0);

viewposi.z = viewposi.z-SPAN*(float)Math.cos(turningAngle+Math.PI/2.0);

setPosition(bodyTrans, viewposi);

setPosition(viewTrans, viewposi);

if (outsideTrans!=null)

setPosition(outsideTrans, new Point3f(Outsidescale*viewposi.x, outsideposi.y, outsideposi.z));

}

else if (buttonvalue.indexOf(“Shiftright”) != -1)

{

direction = SHIFTRIGHT;

viewposi.x = viewposi.x+SPAN*(float)Math.sin(turningAngle+Math.PI/2.0);

viewposi.z = viewposi.z+SPAN*(float)Math.cos(turningAngle+Math.PI/2.0);

setPosition(bodyTrans, viewposi);

setPosition(viewTrans, viewposi);

if (outsideTrans!=null)

setPosition(outsideTrans, new Point3f(Outsidescale*viewposi.x, outsideposi.y, outsideposi.z));

}

if (poststop) postId(VIEWMOTION);

}

if (wakeup instanceof WakeupOnCollisionEntry)

{

// The implememtation of the collision function, go back two step when

// the collision occurs in order to obtain the next collision ability

switch (direction)

{

case Forward:

viewposi.x = viewposi.x+4.0f*SPAN*(float)Math.sin(turningAngle);

viewposi.z = viewposi.z+4.0f*SPAN*(float)Math.cos(turningAngle);

setPosition(bodyTrans, viewposi);

setPosition(viewTrans, viewposi);

if (outsideTrans!=null)