Picking for Web-Based 3D Experiment - Interactive Web-Based Virtual Reality with Java 3D - page 414

h.31 General rotatIon functIon for rotatInG
transformGroup relatIve to Z-axIs

private void setRotationZ(TransformGroup Trans, float angle)

{

Matrix3d rotMat = new Matrix3d();

Transform3D rt3d = new Transform3D();

if (Trans!=null)

{

Trans.getTransform(rt3d);

rt3d.getRotationScale(rotMat);

rotMat.m00 = Math.cos(angle);

rotMat.m11 = rotMat.m00;

rotMat.m10 = Math.sin(angle);

rotMat.m01 = -rotMat.m10;

rt3d.setRotation(rotMat);

Trans.setTransform(rt3d);

}

}

h.32 maIn event response functIon

public void processStimulus (Enumeration criteria)

{

WakeupCriterion wakeup;

AWTEvent[] event;

int eventId;

while (criteria.hasMoreElements())

{

wakeup = (WakeupCriterion) criteria.nextElement();

// Mouse AWT event //

if (wakeup instanceof WakeupOnAWTEvent)

{

event = ((WakeupOnAWTEvent)wakeup).getAWTEvent();

for (int i=0; i<event.length; i++)

{

eventId = event[i].getID();

// Mouse move event //

if (eventId == MouseEvent.MOUSE_MOVED)

{

int x_m = ((MouseEvent)event[i]).getX();

int y_m = ((MouseEvent)event[i]).getY();

pickCanvas.setShapeLocation(x_m, y_m);

Point3d eyePos = pickCanvas.getStartPosition();

pickResult = pickCanvas.pickClosest();

if (pickResult != null)

{

//Get closest intersection results