Picking for Web-Based 3D Experiment - Interactive Web-Based Virtual Reality with Java 3D - page 386

h.22 normalIZatInG mouse anGle to ranGe from 0
to 2pI

//Being used to regulate the angle and make it range from 0 to 2*PAI

private float RegulateAngle(float componentangle, float delta)

{

componentangle = componentangle+delta;

if (componentangle<0.0f) componentangle=componentangle + 2.0f*PAI;

if (componentangle>=2.0f*PAI) componentangle=componentangle - 2.0f*PAI;

return componentangle; //[0, 2*PAI)

}

h.23 lImItInG knob anGle to WIthIn a specIfIc ranGe

//Limiting the angle in the rangle between the minimum and maximum

private float LimitAngle(float delta, float componentangle, float circleposi[])

{

if ((componentangle+delta)<=circleposi[0]||(componentangle+delta)>=circleposi[circleposi.length-

1])

{

//Not allowed to exceed the scope

componentangle = RegulateAngle(componentangle, delta);

}

return componentangle;

}

h.24 lImItInG clIp anGle to WIthIn a specIfIc ranGe

//Limiting the angle in the rangle between the minimum and maximum

private float LimitConnAngle(float delta, float componentangle, float circleposi[])

{

if ((componentangle+delta)<=circleposi[0]&&(componentangle+delta)

>=circleposi[circleposi.length-1])

{

//Not allowed to exceed the scope

componentangle = RegulateAngle(componentangle, delta);

}

return componentangle;

}